NdFeB magnet sintering and cooling equipment

Abstract

The utility model discloses neodymium-iron-boron magnet sintering and cooling equipment, which belongs to the technical field of neodymium-iron-boron preparation and comprises a furnace body, a conical sleeve is fixedly arranged at a first end of the furnace body, an air inlet communicated with the furnace body is axially arranged on the conical sleeve, and the air inlet is hermetically connected with a driving mechanism through a first pipeline. The output end of the driving mechanism is fixedly connected with a conical plate matched with the conical sleeve through a connecting shaft, the connecting shaft is slidably arranged in the air inlet, the diameter of the connecting shaft is smaller than that of the air inlet, the first pipeline is connected with a cooling mechanism through a pipeline, and the cooling mechanism is connected with an air blowing mechanism through a pipeline. And the blast mechanism is hermetically connected with the air outlet at the second end of the furnace body through a pipeline. Through the arrangement of the conical plate, cooling gas blown into the furnace body diffuses and is blown into the neodymium iron boron product in the circumferential direction, the phenomenon that the product and the cooling gas are fractured due to huge temperature difference caused by direct blowing of the cooling gas is avoided, and the uniformity of the cooling gas entering the furnace body is improved.

Description

Technical Field

[0001] This utility model belongs to the field of neodymium iron boron preparation technology, specifically relating to a sintering and cooling device for neodymium iron boron magnets. Background Technology

[0002] In the production process of sintered NdFeB magnets, it is common to encounter sintering of larger products (over 1 kg). Cracking often occurs during the sintering process of these larger products. This is mainly because there is a large temperature difference between the cooling gas and the product during the cooling process. When the product is cooled, it expands and contracts due to heat, resulting in a large contraction force. However, the product itself is subject to gravity and frictional resistance between the material box. The interaction between the frictional force and the contraction force is too great, leading to cracking of the magnet.

[0003] Existing technologies, such as Chinese Patent No. CN206774389U, disclose a sintering apparatus for sintering NdFeB magnets. By changing the blowing direction of the inlet pipe, a gas transition zone is directly formed between the cooling gas and the product, reducing the temperature difference between them and effectively preventing cracking of the product due to a large temperature difference. However, since the cooling gas enters the sintering furnace through multiple inlet pipes, it is difficult to ensure the uniformity of the cooling gas in each inlet pipe, which can easily lead to uneven cooling of the NdFeB magnets.

[0004] Therefore, it is necessary to propose a sintering and cooling device for NdFeB magnets to solve the above problems. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a sintering cooling device for NdFeB magnets, which solves the problem in the prior art where cooling gas enters the sintering furnace through multiple inlet pipes, making it difficult to ensure the uniformity of cooling gas in each inlet pipe, which easily leads to uneven cooling of NdFeB magnets.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a sintering cooling device for NdFeB magnets, including a furnace body. A bracket for placing NdFeB magnets is fixedly installed inside the furnace body. A conical sleeve is fixedly installed at the first end of the furnace body. An air inlet communicating with the furnace body is axially arranged on the conical sleeve. The air inlet is sealed and connected to a drive mechanism for outputting linear motion through a first pipe. The output end of the drive mechanism is fixedly connected to a conical plate that cooperates with the conical sleeve through a connecting shaft. The connecting shaft is slidably arranged inside the air inlet, and the diameter of the connecting shaft is smaller than the diameter of the air inlet. The drive mechanism drives the conical plate to move along the axial direction of the first pipe to open or close the conical air inlet. A cooling mechanism is connected to the first pipe through a pipe. A blower mechanism is connected to the cooling mechanism through a pipe. The blower mechanism is sealed and connected to the air outlet at the second end of the furnace body through a pipe.

[0008] Furthermore, the furnace inner wall array is provided with multiple baffles.

[0009] Furthermore, two adjacent baffles arranged along the axial direction of the furnace body are staggered.

[0010] Furthermore, the inner wall of the conical sleeve is provided with multiple slots around the furnace body axis, and the peripheral wall of the conical plate is provided with multiple locking strips that cooperate with the slots. The movement of the conical plate along the furnace body axis can cause the locking strips to slide along the slots.

[0011] Furthermore, a sealing gasket is fixedly provided on the outer wall of the conical plate.

[0012] Furthermore, the diameter of the large-diameter end of the tapered plate, which is away from the drive mechanism, is larger than the size of the neodymium iron boron magnet.

[0013] Furthermore, the tapered plate has a tapered notch at the end away from the drive mechanism.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention, through the setting of the conical plate, allows the cooling gas blown into the furnace to diffuse along the circumference of the NdFeB product, avoiding the phenomenon of cracking caused by a large temperature difference between the product and the cooling gas due to direct blowing of cooling gas, and improving the uniformity of cooling gas entering the furnace.

[0016] Other advantages, objectives, and features of this invention will be set forth in the following description and will be apparent to those skilled in the art to some extent, or may be learned by practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0017] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0018] Figure 1 This is a cross-sectional view of the cooling device with the air inlet closed according to an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of the cooling device with the air inlet open, according to an embodiment of the present invention.

[0020] The following components are marked in the attached diagram: furnace body 1, conical sleeve 101, air inlet 102, first pipe 103, air outlet 104, slot 105, bracket 2, drive mechanism 3, connecting shaft 301, conical plate 4, retaining strip 401, conical notch 402, cooling mechanism 5, blower mechanism 6, and baffle plate 7. Detailed Implementation

[0021] like Figures 1-2 As shown, this utility model provides a sintering cooling device for NdFeB magnets, comprising: a furnace body 1, a bracket 2 for placing NdFeB magnets fixedly disposed inside the furnace body 1, a conical sleeve 101 fixedly disposed at the first end of the furnace body 1, an air inlet 102 axially disposed on the conical sleeve 101 communicating with the furnace body 1, the air inlet 102 being sealed and connected to a drive mechanism 3 for outputting linear motion via a first pipe 103, the output end of the drive mechanism 3 being fixedly connected to a conical plate 4 cooperating with the conical sleeve 101 via a connecting shaft 301, the diameter of the connecting shaft 301 being smaller than the diameter of the air inlet 102, the drive mechanism 3 driving the conical plate 4 to move along the axial direction of the first pipe 103 to open or close the air inlet 102, the first pipe 103 being connected to a cooling mechanism 5 via a pipe, the cooling mechanism 5 being connected to a blower mechanism 6 via a pipe, and the blower mechanism 6 being sealed and connected to an air outlet 104 at the second end of the furnace body 2 via a pipe.

[0022] In this scheme, during the sintering of NdFeB magnets, the conical plate 4 is used to close the air inlet 102. After sintering, when the NdFeB magnets need to be cooled, the drive mechanism 3 is activated to move the conical plate 4 to open the air inlet 102. The blower mechanism 6 blows gas along the pipe into the cooling mechanism 5 to cool the gas. The cooled gas enters the air inlet 102 through the first pipe 103, diffuses through the conical plate 4, and is blown into the furnace body 1. The diffused cooling gas is blown along the inner wall of the furnace body 1, not directly onto the NdFeB magnets, to avoid the phenomenon of cracking caused by a large temperature difference between the product and the cooling gas due to direct blowing of cooling gas. The conical plate 4 makes the diffused gas flow into the inner wall of the furnace body 1 more evenly. The drive mechanism 3 includes, but is not limited to, conventional technologies in the art such as drive cylinders and drive hydraulic cylinders. The cooling mechanism 5 and the blower mechanism 6 are also conventional technologies in the art and will not be described in detail here.

[0023] In one embodiment of this utility model, the inner wall of the furnace body 1 is provided with a plurality of baffles 7.

[0024] In this scheme, by setting up a baffle plate 7, the cooling gas entering the furnace body 1 along the conical plate 4 changes from a laminar flow state to a turbulent flow state, thereby enhancing the heat exchange effect.

[0025] In one embodiment of this utility model, two adjacent baffles 7 arranged along the axial direction of the furnace body 1 are staggered to improve the baffle effect.

[0026] In one embodiment of this utility model, the inner wall of the conical sleeve 101 is provided with a plurality of slots 105 circumferentially around the axis of the furnace body 1, and the peripheral wall of the conical plate 4 is provided with a plurality of locking strips 401 that cooperate with the slots 105. The movement of the conical plate 4 along the axis of the furnace body 1 can cause the locking strips 401 to slide along the slots 105.

[0027] In this scheme, when the conical plate 4 is driven to move along the axis of the furnace body 1 by the drive mechanism 3, the clamping strip 401 slides along the clamping groove 105, so that a flow-dividing interval is formed between two adjacent clamping strips 401, thereby improving the uniformity of cooling gas flow. The clamping strip 401 slides along the clamping groove 105 to ensure the stability of the limiting sliding of the conical plate 4, and improves the sealing performance of the conical plate 4 in sealing the air inlet 102.

[0028] In one embodiment of this utility model, a sealing gasket is fixedly provided on the outer wall of the conical plate 4 to improve the sealing performance when the conical plate 4 is in contact with the inner wall of the conical sleeve 101.

[0029] In one embodiment of this utility model, the large diameter end of the conical plate 4 is larger than the size of the neodymium iron boron magnet, so that the large diameter end of the conical plate 4 can cover the neodymium iron boron magnet and prevent the diffused cooling gas from blowing directly on the neodymium iron boron magnet.

[0030] In one embodiment of this utility model, the tapered plate 4 is provided with a tapered notch 402 at the end away from the drive mechanism 3, so as to make the tapered plate 4 lightweight.

[0031] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A sintering and cooling device for NdFeB magnets, comprising a furnace body, wherein a support for placing NdFeB magnets is fixedly disposed within the furnace body, characterized in that: A conical sleeve is fixedly installed at the first end of the furnace body. An air inlet communicating with the furnace body is axially arranged on the conical sleeve. The air inlet is sealed and connected to a drive mechanism for outputting linear motion through a first pipe. The output end of the drive mechanism is fixedly connected to a conical plate that cooperates with the conical sleeve through a connecting shaft. The connecting shaft is slidably arranged inside the air inlet, and the diameter of the connecting shaft is smaller than the diameter of the air inlet. The drive mechanism drives the conical plate to move along the axial direction of the first pipe to open or close the conical air inlet. A cooling mechanism is connected to the first pipe through a pipe. A blower mechanism is connected to the cooling mechanism through a pipe. The blower mechanism is sealed and connected to the air outlet at the second end of the furnace body through a pipe.

2. The NdFeB magnet sintering cooling equipment according to claim 1, characterized in that: The furnace inner wall is arrayed with multiple baffles.

3. The NdFeB magnet sintering cooling equipment according to claim 2, characterized in that: Two adjacent baffles are staggered along the axial direction of the furnace body.

4. The NdFeB magnet sintering cooling equipment according to claim 3, characterized in that: The inner wall of the conical sleeve is provided with multiple slots around the furnace body axis, and the peripheral wall of the conical plate is provided with multiple locking strips that cooperate with the slots. The movement of the conical plate along the furnace body axis can cause the locking strips to slide along the slots.

5. The NdFeB magnet sintering cooling equipment according to claim 4, characterized in that: A sealing gasket is fixedly installed on the outer wall of the conical plate.

6. The NdFeB magnet sintering cooling equipment according to claim 5, characterized in that: The diameter of the large-diameter end of the tapered plate, which is away from the drive mechanism, is larger than the size of the neodymium iron boron magnet.

7. The NdFeB magnet sintering cooling equipment according to claim 6, characterized in that: The tapered plate has a tapered notch at the end away from the drive mechanism.

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