A high-efficiency sintering furnace for neodymium iron boron magnets

Abstract

This invention discloses a high-efficiency sintering furnace for neodymium iron boron magnets, comprising a sintering cylinder, a heating sleeve on the inner wall of one end of the sintering cylinder, and heat-conducting rings evenly distributed on the outer wall of the heating sleeve. Heat-conducting holes are evenly distributed on the outer wall of the heat-conducting rings. A columnar sintering box is inserted into the inner wall of the heating sleeve. Two sets of equally spaced, annularly distributed air guide holes are opened on the outer walls of both ends of the heating sleeve. An inlet ring and an exhaust ring are respectively fitted onto the outer walls of the air guide holes. This invention heats the heating sleeve using an electromagnetic heating coil. The heating sleeve can rapidly heat up under the synergistic effect of the heat-conducting rings and holes, and uniformly transfers heat to the material inside the columnar sintering box, shortening the sintering time. Gas is introduced through an electric valve on the air guide pipe connected to the inlet ring. The gas enters the sintering cylinder through the air guide holes, forming a flowing airflow. The gas flows through the heat-conducting rings and holes, quickly carrying away the heat from the heating sleeve and shortening the cooling time.

Description

Technical Field

[0001] This utility model relates to the technical field of neodymium iron boron magnet processing equipment, specifically to a high-efficiency sintering furnace for neodymium iron boron magnets. Background Technology

[0002] Neodymium iron boron magnets are currently the most powerful permanent magnet materials in terms of overall performance. They have a tetragonal crystal structure and can form extremely strong magnetic anisotropy. They are widely used in high-precision fields such as drive motors for new energy vehicles, permanent magnets for wind turbines, joints for industrial robots, vibration motors for consumer electronics, nuclear magnetic resonance imaging equipment, and attitude control systems for aerospace.

[0003] In the production of NdFeB magnets, sintering is a critical process that relies on high-temperature heating in a sintering furnace. However, existing sintering furnaces still have shortcomings in terms of heat transfer efficiency and uniformity. Specifically, heat is difficult to transfer quickly and evenly to the interior of the sintered blank, resulting in uneven heating in different parts of the material. This uneven heat transfer easily leads to problems such as incomplete sintering or uneven density distribution of the sintered body, which not only significantly prolongs the necessary sintering time but also directly restricts production efficiency. In addition, during the cooling stage, the commonly used natural cooling or simple air cooling methods have too slow a cooling rate, further lengthening the overall production cycle and becoming a significant bottleneck to improving production efficiency. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a high-efficiency sintering furnace for neodymium iron boron magnets, thereby solving the problems mentioned in the background art.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A high-efficiency sintering furnace for neodymium iron boron magnets includes a sintering cylinder. A sealing cover is movably connected to the outer wall of one end of the sintering cylinder via a hinge. A heating sleeve is fixedly provided on the inner wall of the other end of the sintering cylinder. A heat-conducting ring is fixedly provided on the outer wall of the heating sleeve at equal intervals. Heat-conducting holes are opened on the outer wall of the heat-conducting ring at equal intervals. A columnar sintering box is inserted into the inner wall of the heating sleeve. Two sets of air guide holes are opened on the outer walls of both ends of the sintering cylinder in an annular arrangement at equal intervals. An air inlet ring and an air outlet ring are respectively sleeved on the outer wall of the air guide holes. Both the air inlet ring and the air outlet ring are connected to the air guide holes.

[0007] As a preferred embodiment of a high-efficiency sintering furnace for neodymium iron boron magnets, the inner wall of the sintering cylinder is fixedly provided with a jacket, and an interlayer is provided between the interior of the sintering cylinder and the jacket, and an electromagnetic heating coil is provided in the interlayer.

[0008] As a preferred embodiment of a high-efficiency sintering furnace for NdFeB magnets, the top of the inlet ring and the outlet ring are connected to a vertically upward gas guide pipe through an opening. An electric valve is installed on the gas guide pipe, and a pipe joint is fixedly provided at one end of the top of the gas guide pipe.

[0009] As a preferred embodiment of a high-efficiency sintering furnace for neodymium iron boron magnets, a vacuum pump is fixedly installed on one side of the outer wall of the sintering cylinder, the output end of the vacuum pump is connected to an extraction pipe, and the other end of the extraction pipe is connected to the interior of the sintering cylinder.

[0010] As a preferred embodiment of a high-efficiency sintering furnace for neodymium iron boron magnets, a thermometer and a pressure gauge are respectively installed on one side of the outer wall of the sintering cylinder, and the detection ends of the thermometer and pressure gauge are located inside the sintering cylinder.

[0011] As a preferred embodiment of a high-efficiency sintering furnace for NdFeB magnets, a docking ring is fixedly provided on the outer wall of one end of the columnar sintering box. The outer wall of the docking ring has three equidistant first fixing holes. A matching docking plate is provided on one side of the columnar sintering box. The outer wall of the docking plate has three equidistant second fixing holes. The inner walls of the first and second fixing holes are equipped with matching bolts. A pull block is fixedly provided at the center of one side of the outer wall of the docking plate.

[0012] As a preferred embodiment of a high-efficiency sintering furnace for neodymium iron boron magnets, the outer wall of the sintering cylinder is fixedly provided with two fixing rings, and the outer walls on both sides of the two fixing rings are fixedly provided with vertically downward supporting legs.

[0013] The beneficial effects of this utility model are:

[0014] This invention uses an electromagnetic heating coil to heat the heating sleeve. With the synergistic effect of the heat-conducting ring and heat-conducting holes, the heating sleeve can rapidly heat up and evenly transfer heat to the material inside the columnar sintering box, ensuring uniform heating, shortening sintering time, and improving production efficiency. Simultaneously, this invention introduces gas through an electric valve on the gas guide pipe connected to the air inlet ring. The gas enters the sintering cylinder through the gas guide holes, forming a circulating airflow. As the gas flows through the heat-conducting ring and heat-conducting holes, it quickly removes heat from the heating sleeve, greatly accelerating the cooling rate of the columnar sintering box, reducing cooling time, and further improving overall production efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly described below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the high-efficiency sintering furnace for the neodymium iron boron magnet described in this utility model.

[0017] Figure 2 This is a schematic diagram of the external structure of the sintering cylinder described in this utility model.

[0018] Figure 3 This is a cross-sectional structural diagram of the sintering cylinder described in this utility model.

[0019] Figure 4 This is a schematic diagram of the structure of the jacket described in this utility model.

[0020] Figure 5 This is a schematic diagram of the structure of the heating sleeve described in this utility model.

[0021] Figure 6 This is a schematic diagram of the intake ring described in this utility model.

[0022] Figure 7 This is a schematic diagram of the columnar sintering box described in this utility model.

[0023] Figure 8 This is a schematic diagram of the structure of the docking plate described in this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Sintering cylinder; 2. Sealing cover; 3. Heating sleeve; 4. Heat-conducting ring; 5. Heat-conducting hole; 6. Gas vent; 7. Inlet ring; 8. Exhaust ring; 9. Gas duct pipe; 10. Electric valve; 11. Pipe joint; 12. Jacket; 13. Electromagnetic heating coil; 14. Vacuum pump; 15. Evacuation pipe; 16. Thermometer; 17. Pressure gauge; 18. Columnar sintering box; 19. Connecting ring; 20. First fixing hole; 21. Connecting plate; 22. Second fixing hole; 23. Pull block; 24. Fixing ring; 25. Support leg. Detailed Implementation

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0028] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Example 1:

[0031] like Figures 1 to 8 As shown, this embodiment provides a high-efficiency sintering furnace for NdFeB magnets, including a sintering cylinder 1. One end of the outer wall of the sintering cylinder 1 is movably connected to a sealing cover 2 via a hinge, and the other end of the inner wall is fixedly installed with a heating sleeve 3. The outer wall of the heating sleeve 3 is provided with heat-conducting rings 4 distributed at equal intervals, and heat-conducting holes 5 are opened at equal intervals on the outer wall of the heat-conducting rings 4. The inner wall of the heating sleeve 3 is reserved with a space for inserting a columnar sintering box 18. The heat-conducting rings 4 and heat-conducting holes 5 can accelerate the heat exchange of the heating sleeve 3, thereby improving the heating or cooling efficiency. At the same time, two sets of air guide holes 6 are opened at equal intervals in annular distribution on the outer walls of both ends of the sintering cylinder 1. An air inlet ring 7 and an air outlet ring 8 are respectively sleeved on the outer walls of the two sets of air guide holes 6, so that the air guide holes 6 are located inside the air inlet ring 7 and the air outlet ring 8. When it is necessary to cool the NdFeB magnets inside the sintering cylinder 1, the gas can enter the interior of the sintering cylinder 1 through the air inlet ring 7 and flow out from the air outlet ring 8, thereby forming a circulating gas inside the sintering cylinder 1.

[0032] Example 2:

[0033] Based on Embodiment 1, this embodiment fixes a jacket 12 on the inner wall of the sintering cylinder 1, forming a sandwich between the inside of the sintering cylinder 1 and the jacket 12. An electromagnetic heating coil 13 is installed in the sandwich. The tops of the air inlet ring 7 and the air outlet ring 8 are connected to a vertically upward air guide pipe 9 through an opening. An electric valve 10 is installed on the air guide pipe 9, and a pipe joint 11 is fixedly installed at one end of the top of the air guide pipe 9. A vacuum pump 14 is fixedly installed on one side of the outer wall of the sintering cylinder 1. The output end of the vacuum pump 14 is connected to a suction pipe 15, so that the other end of the suction pipe 15 is connected to the inside of the sintering cylinder 1. A thermometer 16 and a pressure gauge 17 are respectively installed on one side of the outer wall of the sintering cylinder 1. The detection ends of the thermometer 16 and the pressure gauge 17 are located inside the sintering cylinder 1. The thermometer 16 can detect the internal temperature of the sintering cylinder 1 in real time, while the pressure gauge 17, in conjunction with the vacuum pump 14, can make the inside of the sintering cylinder 1 reach the required vacuum level.

[0034] Example 3:

[0035] Based on Embodiment 1, this embodiment has a docking ring 19 fixedly installed on the outer wall of one end of the columnar sintering box 18. Three first fixing holes 20 are opened on the outer wall of the docking ring 19 at equal distances to prepare a docking plate 21 that is compatible with the columnar sintering box 18. Three second fixing holes 22 are opened on the outer wall of the docking plate 21 at equal distances to prepare bolts that are compatible with the first fixing holes 20 and the second fixing holes 22. A pull block 23 is fixedly installed at the center of one side of the outer wall of the docking plate 21. Two fixing rings 24 are fixedly installed on the outer wall of the sintering cylinder 1. Vertically downward support legs 25 are fixedly installed on the outer walls on both sides of the two fixing rings 24.

[0036] Working principle and usage process of this utility model:

[0037] Refer to the instruction manual appendix Figure 1-8In use, the high-efficiency sintering furnace of this invention first places the NdFeB magnet material to be sintered into the cylindrical sintering box 18. Then, align one end of the mating plate 21 with one end of the mating ring 19, so that the first fixing hole 20 and the second fixing hole 22 correspond, and then fix it with bolts. Slowly insert the cylindrical sintering box 18 containing the material into the heating sleeve 3 inside the sintering cylinder 1. Close the sealing cover 2 at one end of the sintering cylinder 1, which is connected by a hinge. Turn on the vacuum pump 14 and extract the air inside the sintering cylinder 1 through the air extraction pipe 15. Observe the reading of the pressure gauge 17. When the required vacuum degree is reached, turn off the vacuum pump 14. Then, start the electromagnetic heating coil 13 to heat the sleeve 3 and the heat-conducting ring on it. 4. Heat is evenly transferred to the material inside the columnar sintering box 18 to ensure uniform heating. After sintering, the electric valve 10 on the gas guide pipe 9 connected to the air inlet ring 7 and the exhaust ring 8 is opened simultaneously. Gas is introduced through the pipe joint 11 and enters the sintering cylinder 1 through the gas guide hole 6. Gas is generated inside the sintering cylinder 1 and flows through the heat-conducting ring 4 and heat-conducting hole 5 fixed on the outer wall of the heating sleeve 3. This can quickly remove the heat from the heating sleeve 3, thereby accelerating the cooling speed of the columnar sintering box 18. After cooling, the sealing cover 2 is opened, and the columnar sintering box 18 is pulled out from the heating sleeve 3 by the pull block 23. The sintered neodymium iron boron magnet is then removed, thus completing the entire sintering process.

[0038] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.

Claims

1. A high-efficiency sintering furnace for neodymium iron boron magnets, characterized in that, The sintering cylinder (1) includes a sintering cylinder (1), one end of which is connected to a sealing cap (2) via a hinge. The other end of the sintering cylinder (1) is fixedly provided with a heating sleeve (3). The outer wall of the heating sleeve (3) is fixedly provided with heat-conducting rings (4) distributed at equal intervals. The outer wall of the heat-conducting rings (4) is provided with heat-conducting holes (5) distributed at equal intervals. The inner wall of the heating sleeve (3) is inserted with a columnar sintering box (18). The outer walls of both ends of the sintering cylinder (1) are provided with two sets of air guide holes (6) distributed at equal intervals in an annular pattern. The outer walls of the air guide holes (6) are respectively fitted with an air inlet ring (7) and an air outlet ring (8). The air inlet ring (7) and the air outlet ring (8) are both connected to the air guide holes (6).

2. The high-efficiency sintering furnace for NdFeB magnets according to claim 1, characterized in that, The inner wall of the sintering cylinder (1) is fixedly provided with a jacket (12), and there is a sandwich layer between the inside of the sintering cylinder (1) and the jacket (12), and an electromagnetic heating coil (13) is provided in the sandwich layer.

3. The high-efficiency sintering furnace for NdFeB magnets according to claim 1, characterized in that, The top of the intake ring (7) and the exhaust ring (8) are connected by an upward vertical air guide pipe (9) through an opening. An electric valve (10) is installed on the air guide pipe (9), and a pipe joint (11) is fixedly provided at one end of the top of the air guide pipe (9).

4. The high-efficiency sintering furnace for NdFeB magnets according to claim 1, characterized in that, A vacuum pump (14) is fixedly installed on one side of the outer wall of the sintering cylinder (1). The output end of the vacuum pump (14) is connected to a suction pipe (15), and the other end of the suction pipe (15) is connected to the interior of the sintering cylinder (1).

5. The high-efficiency sintering furnace for NdFeB magnets according to claim 1, characterized in that, A thermometer (16) and a pressure gauge (17) are respectively installed on one side of the outer wall of the sintering cylinder (1), and the detection ends of the thermometer (16) and the pressure gauge (17) are located inside the sintering cylinder (1).

6. The high-efficiency sintering furnace for NdFeB magnets according to claim 1, characterized in that, A docking ring (19) is fixedly provided on the outer wall of one end of the columnar sintering box (18). The outer wall of the docking ring (19) has three first fixing holes (20) distributed at equal intervals. A matching docking plate (21) is provided on one side of the columnar sintering box (18). The outer wall of the docking plate (21) has three second fixing holes (22) distributed at equal intervals. The inner walls of the first fixing holes (20) and the second fixing holes (22) are equipped with matching bolts. A pull block (23) is fixedly provided at the center of the outer wall of one side of the docking plate (21).

7. The high-efficiency sintering furnace for NdFeB magnets according to claim 1, characterized in that, Two fixing rings (24) are fixedly provided on the outer wall of the sintering cylinder (1), and vertically downward supporting legs (25) are fixedly provided on the outer walls of the two fixing rings (24).

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