Amorphous strip core heat treatment apparatus

Abstract

A heat treatment apparatus for amorphous ribbon magnetic cores includes a magnetic core mounting frame, a positioning fixture, and a gas guide plate. Each magnetic core mounting unit has a magnetic core roll mounted on it, with axial spacing between the magnetic core rolls. The space between the magnetic core mounting frames forms an axial air duct, while the axial spacing between the magnetic core rolls forms a horizontal air duct. This allows hot air to flow through the axial and horizontal air ducts and contact each magnetic core roll on the magnetic core mounting frame. Combined with ventilation slots on the positioning fixture, a three-dimensional grid-like air duct covering all the magnetic core rolls is formed. By setting the gas guide plate inside the furnace cavity, the hot air inside the furnace is evenly distributed and guided into the three-dimensional grid-like air duct, allowing the hot air to flow evenly across the surface of each magnetic core roll from multiple directions. This improves the uniformity of the temperature field inside the furnace, solves the problem of delayed heating of the magnetic core roll at the center in existing stacking methods, and avoids incomplete stress relief due to insufficient heating or embrittlement and microcrystallization due to localized overheating.

Description

Technical Field

[0001] This invention belongs to the field of heat treatment technology for amorphous ribbon materials, specifically referring to a heat treatment device for amorphous ribbon magnetic cores. Background Technology

[0002] Amorphous ribbon is a thin strip product made from an alloy with iron, silicon, boron and other elements as the main components through rapid cooling technology. Amorphous ribbon is mainly processed into various forms of magnetic core components and is widely used in power electronic equipment such as distribution transformers, motor stators, high-frequency switching power supplies, and electromagnetic sensors. During the rapid solidification and subsequent winding process, amorphous ribbon will freeze a large amount of internal stress. If these stresses are not eliminated, they will seriously degrade the soft magnetic properties of the material. Through precise control of annealing, short-range rearrangement of atoms can be promoted, effectively releasing the internal stress. At the same time, it induces the formation of local structures that are conducive to the optimization of magnetic properties, thereby reducing coercivity, increasing permeability and reducing iron loss, so that the soft magnetic properties of the material can be fully utilized.

[0003] The annealing process commonly used in industrial production involves stacking multiple amorphous strip rolls axially on a limiting shaft, mechanically fixing them with upper and lower fixtures, and then loading them into an annealing furnace for processing. However, due to the tight fit between the strip rolls and the obstruction of the plate-shaped fixtures, the hot air circulation is difficult to evenly apply to the surface of each strip roll. This results in the heating rate of the strip rolls at the center of the stack lagging significantly behind that at the edges. This uneven temperature distribution directly leads to inconsistent annealing degrees among the strip rolls. Some strip rolls may not be fully stress-relieved due to insufficient heating, while others may become brittle or even microcrystalline due to local overheating, seriously affecting the consistency of product performance in batch processing. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a heat treatment device for amorphous ribbon magnetic cores, so as to at least partially solve the problems mentioned in the background art.

[0005] The technical solution adopted in this invention is as follows: A heat treatment device for amorphous ribbon magnetic cores is proposed, comprising: At least one core mounting bracket is formed by stacking multiple core mounting units axially. The positioning fixture includes an upper positioning plate and a lower positioning plate, used to fix multiple magnetic core mounting brackets; The gas guide plate is set inside the furnace cavity and distributed on the upper and lower sides of the positioning fixture; Each of the magnetic core mounting units is equipped with a magnetic core roll, and the magnetic core rolls are axially spaced apart. Ventilation slots are provided on the upper and lower positioning plates. When the magnetic core mounting frame is fixed, the ventilation slots form an axial air duct corresponding to the space between the magnetic core mounting frames, while the axial spacing of the magnetic core rolls forms a horizontal air duct. The air guide plate is configured to distribute the airflow in the furnace to the ventilation slots, so that the hot airflow can contact each of the magnetic core rolls on the magnetic core mounting frame through the axial and horizontal air ducts.

[0006] Furthermore, each of the magnetic core mounting units includes a roll support and a support cone disposed on the upper end of the roll support. The roll support is provided with a roll placement groove for accommodating the magnetic core roll. The support cone protrudes upward, so that when the magnetic core mounting units are stacked axially, the axial spacing between the magnetic core rolls forms the axial air duct.

[0007] Furthermore, the roll support includes a plurality of U-shaped support pieces that are centrally symmetrically distributed. The concave portions of the U-shaped support pieces constitute the roll mounting groove, and gap areas distributed around the periphery of the magnetic core roll are formed between any adjacent support pieces.

[0008] Furthermore, the support cone includes a cone ring and a connecting frame. The cone ring is constructed as a circumferentially closed annular structure. The connecting frame connects the cone ring and the drum support, and the connecting frame includes multiple connecting pieces. The positions of the connecting pieces correspond to the number and position of the support pieces.

[0009] Furthermore, the number of connecting pieces and support pieces is set to 6 to 8, and the bottom center of the roll support is provided with a support groove for positioning in conjunction with the support cone below. The center of the support cone is provided with a through hole running vertically through it.

[0010] Furthermore, the three inner walls of the U-shaped support piece are respectively attached to the bottom surface and the inner and outer walls of the magnetic core drum.

[0011] Furthermore, the lower positioning plate is provided with multiple positioning cones, and the upper positioning plate is provided with multiple positioning cone grooves. The upper and lower ends of the magnetic core mounting bracket are respectively fitted with the positioning cone grooves and the positioning cones. Bolt assemblies are provided on the upper and lower positioning plates corresponding to the magnetic core mounting bracket. The bolt assemblies pass through the positioning cones, through holes and positioning cone grooves, fixing the magnetic core mounting bracket between the upper and lower positioning plates.

[0012] Furthermore, the ventilation slots are disposed in the space between the upper and lower positioning plates corresponding to the magnetic core mounting bracket. The plurality of ventilation slots are connected to the axial air ducts in the positioning fixture, and the axial air ducts are connected to the horizontal air ducts to form a three-dimensional grid-like air duct.

[0013] Furthermore, the air guide plate has an internal air guide cavity, and the surface of the air guide plate has an air inlet window and an air outlet window. The air guide plate is used to introduce the airflow in the furnace cavity into the air guide cavity through the air inlet window, and then distribute it to the ventilation slot through the air outlet window.

[0014] Furthermore, the position of the air outlet corresponds to the position of the ventilation slot, so as to evenly guide the airflow in the air guide cavity into each of the ventilation slots.

[0015] Beneficial effects: This invention utilizes a magnetic core mounting frame formed by axially stacking magnetic core mounting units. This creates axial gaps between the stacked magnetic core rolls, providing channels for hot air flow in both horizontal and axial directions. Combined with ventilation slots on the positioning fixture, the spaces between adjacent magnetic core mounting frames form axial air ducts, which connect with the horizontal air ducts formed by the axial gaps between the magnetic core rolls. This creates a three-dimensional grid-like air duct covering all magnetic core rolls. By installing a guide plate within the furnace cavity, hot air is evenly distributed and guided into the three-dimensional grid-like air duct, allowing hot air to flow uniformly across the surface of each magnetic core roll from multiple directions. This improves the uniformity of the temperature field within the furnace, solves the problem of delayed heating of the central magnetic core roll in existing stacking methods, ensures consistent annealing of magnetic core rolls processed in batches, and avoids incomplete stress relief due to insufficient heating or embrittlement and microcrystallization due to localized overheating. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of an amorphous ribbon magnetic core heat treatment device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the distribution structure of the magnetic core mounting unit within the positioning fixture according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the magnetic core mounting unit proposed in an embodiment of the present invention, which is superimposed within a positioning fixture. Figure 4 This is a three-dimensional structural diagram of the magnetic core mounting unit distributed within the positioning fixture according to an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the magnetic core mounting unit proposed in an embodiment of the present invention; Figure 6 A cross-sectional view of the magnetic core mounting unit is provided for an embodiment of the present invention; Figure 7A top view of the magnetic core mounting unit is provided as an embodiment of the present invention; Figure 8 This is a three-dimensional structural diagram of the positioning fixture proposed in an embodiment of the present invention.

[0017] Among them, 001 is the axial air duct; 002 is the horizontal air duct; 10 is the magnetic core mounting unit; 100 is the magnetic core drum; 11 is the drum support; 110 is the drum placement groove; 111 is the support groove; 112 is the gap area; 12 is the support cone; 120 is the through hole; 121 is the cone ring; 122 is the connecting frame; 20 is the positioning fixture; 201 is the upper positioning plate; 202 is the lower positioning plate; 21 is the positioning cone; 22 is the positioning cone groove; 200 is the ventilation slot; 30 is the air guide plate; 300 is the air guide cavity; 301 is the air inlet window; 302 is the air outlet window; and 40 is the furnace cavity.

[0018] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0020] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., 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 the embodiments 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, they should not be construed as limitations on the embodiments.

[0021] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, an embodiment of the present invention provides a heat treatment device for amorphous ribbon magnetic cores, including a magnetic core mounting frame, a positioning fixture 20, a gas guide plate 30, and an annealing furnace.

[0022] The magnetic core mounting frame is formed by stacking multiple magnetic core mounting units 10 along the axial direction. The positioning fixture 20 includes an upper positioning plate 201 and a lower positioning plate 202 for fixing multiple magnetic core mounting frames. The gas guide plate 30 is set in the furnace cavity 40 of the annealing furnace and distributed on the upper and lower sides of the positioning fixture 20.

[0023] Thus, this device stacks multiple magnetic core mounting units 10 to form an independent magnetic core mounting frame, then fixes the multiple magnetic core mounting frames on the positioning fixture 20 according to the preset position, and finally places the whole device in the furnace cavity 40 of the annealing furnace for annealing treatment. The function of the air guide plate 30 is to redistribute the hot air flow in the furnace cavity 40 so that it can enter the positioning fixture 20 more effectively.

[0024] Furthermore, each magnetic core mounting unit 10 is equipped with a magnetic core drum 100, which can form an axial gap between the magnetic core drums 100. Ventilation slots 200 are provided on the upper positioning plate 201 and the lower positioning plate 202. When the magnetic core mounting frame is fixed, the ventilation slots 200 form an axial air duct 001 corresponding to the space between the magnetic core mounting frames, while the axial gap of the magnetic core drums 100 forms a horizontal air duct 002.

[0025] Furthermore, the air guide plate 30 is configured to distribute the hot air flow in the furnace to the ventilation slot 200, so that the hot air flow can contact each magnetic core drum 100 on the magnetic core mounting frame through the axial air duct 001 and the horizontal air duct 002.

[0026] During operation, hot air is introduced from the furnace cavity 40 by the air guide plate 30. It first enters the positioning fixture 20 through the ventilation slot 200, and then flows along the axial air duct 001. At the same time, it diffuses laterally to the surrounding area of ​​each magnetic core drum 100 through the horizontal air duct 002, forming a three-dimensional circulation. This ensures that each magnetic core drum 100 can fully contact the hot air, solving the problem of insufficient heating at the center position in the traditional stacking method.

[0027] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, each magnetic core mounting unit 10 includes a roll support 11 and a support cone 12 disposed on the upper end of the roll support 11.

[0028] The drum support 11 is provided with a drum mounting groove 110 for accommodating the magnetic core drum 100. The support cone 12 protrudes upward, so that when the adjacent magnetic core mounting units 10 are stacked in the axial direction, the axial spacing space between the magnetic core drums 100 forms an axial air duct 001. The structural cooperation between the drum support 11 and the support cone 12 enables the magnetic core drums 100 to not be in direct contact when stacked, but to maintain a fixed spacing distance through the support cone 12, thus reserving a channel for the flow of hot air in the axial direction.

[0029] like Figure 6As shown, the drum support 11 includes multiple U-shaped support plates arranged in a centrally symmetrical manner. The concave portions of the U-shaped support plates form the drum mounting groove 110, and gap areas 112 are formed between any adjacent support plates and distributed around the periphery of the magnetic core drum 100. This multi-plate structure not only reduces the overall weight of the drum support 11, but also provides a channel for hot air to contact the peripheral surface of the magnetic core drum 100 in the horizontal direction through the gap areas 112 between adjacent support plates, allowing the hot air to enter evenly from all sides of the magnetic core drum 100 and avoiding one-sided heating.

[0030] Furthermore, the support cone 12 includes a cone ring 121 and a connecting frame 122. The cone ring 121 is constructed as a circumferentially closed annular structure. The connecting frame 122 connects the cone ring 121 and the drum support 11, and the connecting frame 122 includes multiple connecting pieces. The positions of the connecting pieces correspond to the number and position of the support pieces.

[0031] The closed structure of the conical ring 121 ensures the overall strength of the entire magnetic core mounting unit 10, while the connecting frame 122 realizes the reliable connection between the conical ring 121 and the lower drum support 11. At the same time, its position corresponds to the support plate, ensuring a clear force transmission path and structural stability.

[0032] In some embodiments, the number of connecting pieces and support pieces is set to 6 to 8. The bottom center of the roll support 11 is provided with a support groove 111 for positioning with the support cone 12 below. The center of the support cone 12 is provided with a through hole 120 that runs vertically through the top and bottom. The support groove 111 cooperates with the top of the support cone 12 to achieve accurate positioning and stable stacking of adjacent magnetic core mounting units 10. The through hole 120 is provided to provide space for subsequent fixing bolts to pass through.

[0033] Specifically, the three inner walls of the "U"-shaped support plate are respectively fitted to the bottom surface and the inner and outer walls of the magnetic core drum 100. By precisely controlling the dimensional tolerances of the support plate, a slight interference fit or clearance fit is formed between the inner wall of the support plate and the surface of the magnetic core drum 100. After the magnetic core drum 100 is installed into the drum mounting groove 110, the support plate, using its own rigid structure, applies a certain radial and axial constraint force to the magnetic core drum 100, thereby effectively preventing the magnetic core drum 100 from loosening between layers, curling of the rolled edges, or overall displacement due to thermal expansion or airflow impact during the annealing process. At the same time, this multi-point, multi-directional fitting and limiting can stably hold the magnetic core drum 100 in the designed position, ensuring that the axial spacing between it and the adjacent magnetic core drums 100 is accurate and consistent, and providing a guarantee for the regular formation of the horizontal air duct 002.

[0034] like Figure 8As shown, the lower positioning plate 202 is provided with multiple positioning cones 21, and the upper positioning plate 201 is provided with multiple positioning cone grooves 22. The upper and lower ends of the magnetic core mounting bracket are respectively fitted with the positioning cone grooves 22 and the positioning cones 21. Bolt assemblies are provided on the upper positioning plate 201 and the lower positioning plate 202 at the locations corresponding to the magnetic core mounting brackets. The bolt assemblies pass through the positioning cones 21, the through holes 120 and the positioning cone grooves 22, fixing the magnetic core mounting bracket between the upper positioning plate 201 and the lower positioning plate 202.

[0035] The positioning cone 21 and the positioning cone groove 22 work together to enable the magnetic core mounting bracket to be positioned quickly and accurately, while the bolt assembly provides reliable axial fastening force to ensure that the entire mounting bracket remains structurally stable during handling and annealing.

[0036] like Figure 1 and Figure 3 As shown, the ventilation slots 200 are located in the space between the corresponding magnetic core mounting brackets on the upper positioning plate 201 and the lower positioning plate 202. Multiple ventilation slots 200 are connected to the axial air ducts 001 in the positioning fixture 20, and the axial air ducts 001 are connected to the horizontal air ducts 002 to form a three-dimensional grid-like air duct.

[0037] The three-dimensional mesh-like air duct is a network of flow paths formed by multiple mutually perpendicular or intersecting axial air ducts 001 and horizontal air ducts 002 interwoven in three-dimensional space. The axial air ducts 001 run vertically through the entire positioning fixture 20, while the horizontal air ducts 002 extend horizontally in each axial interval layer, and the two are interconnected at spatial nodes.

[0038] When hot air enters the ventilation slot 200 from the air guide plate 30, it first flows along the axial air duct 001. When it encounters the horizontal air duct 002, part of the airflow will be diverted into the horizontal air duct 002 and diffuse horizontally to the periphery of the magnetic core drum 100. At the same time, the airflow in the horizontal air duct 002 will re-enter the axial air duct 001 through the connection node with the axial air duct 001, forming a three-dimensional circulation. This three-dimensional grid-like air duct design allows hot air to flow simultaneously to each magnetic core drum 100 from multiple dimensions and directions inside the positioning fixture 20, minimizing the temperature field non-uniformity caused by unidirectional airflow or local stagnation, and ensuring that all magnetic core drums 100 experience essentially the same amount of heat during the annealing process.

[0039] like Figure 1As shown, the air guide plate 30 has an air guide cavity 300 inside, and the surface of the air guide plate 30 has an air inlet window 301 and an air outlet window 302. The air guide plate 30 is used to introduce the airflow in the furnace cavity 40 into the air guide cavity 300 through the air inlet window 301, and then distribute it to the ventilation slots 200 through the air outlet window 302. The air guide plate 30 acts as an airflow distributor, guiding the originally disordered or unidirectional hot air in the furnace cavity 40 to each ventilation slot 200 of the positioning fixture 20 in an orderly manner.

[0040] Furthermore, the position of the air outlet 302 corresponds to the position of the ventilation slot 200, so as to evenly guide the airflow in the air guide cavity 300 into each ventilation slot 200. This corresponding arrangement ensures the uniformity of airflow distribution, avoids the situation where some ventilation slots 200 have too much air intake and some ventilation slots 200 have too little air intake, and improves the uniformity of the temperature field.

[0041] The working process of this device is as follows: First, multiple magnetic core drums 100 are respectively installed on the drum bracket 11 of the magnetic core mounting unit 10 and fixed by the U-shaped bracket piece. Then, multiple magnetic core mounting units 10 are stacked axially to form a magnetic core mounting frame. The bracket cone 12 keeps the adjacent magnetic core drums 100 axially spaced. Subsequently, multiple magnetic core mounting frames are installed between the lower positioning plate 202 and the upper positioning plate 201 through the positioning cone 21 and the positioning cone groove 22, and locked with bolt assembly to form a complete positioning fixture 20 assembly.

[0042] Then, the assembled positioning fixture 20 is hoisted into the furnace cavity 40 of the annealing furnace, and air guide plates 30 are installed on its upper and lower sides. During annealing, the hot air in the furnace cavity 40 is drawn into the air guide cavity 300 by the air inlet window 301 of the air guide plate 30, and then evenly distributed to the ventilation slots 200 of the upper positioning plate 201 and the lower positioning plate 202 through the air outlet window 302. The hot air enters the interior of the positioning fixture 20 through the ventilation slots 200, flows along the axial air channel 001, and diffuses to the periphery of each magnetic core drum 100 through the horizontal air channel 002. It also makes full contact with the surface of the magnetic core drum 100 through the gap area 112 to complete the heat exchange. Through the circulation of the three-dimensional grid-like air channel, the hot air evenly heats each magnetic core drum 100, making its annealing degree consistent.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A heat treatment apparatus for amorphous ribbon magnetic cores, characterized in that, include: At least one core mounting bracket is formed by stacking multiple core mounting units (10) axially; The positioning fixture (20) includes an upper positioning plate (201) and a lower positioning plate (202) for fixing multiple magnetic core mounting brackets; The gas guide plate (30) is set inside the furnace cavity (40) and distributed on the upper and lower sides of the positioning fixture (20); Each of the magnetic core mounting units (10) is equipped with a magnetic core drum (100), and the magnetic core drums (100) are axially spaced together. Ventilation slots (200) are provided on the upper positioning plate (201) and the lower positioning plate (202). When the magnetic core mounting frame is fixed, the ventilation slots (200) form an axial air duct (001) corresponding to the space between the magnetic core mounting frames, and the axial spacing of the magnetic core drums (100) forms a horizontal air duct (002). The air guide plate (30) is configured to distribute the airflow in the furnace to the ventilation slots (200), so that the hot airflow can contact each of the magnetic core drums (100) on the magnetic core mounting frame through the axial air duct (001) and the horizontal air duct (002).

2. The heat treatment apparatus for amorphous ribbon magnetic cores according to claim 1, characterized in that: Each of the magnetic core mounting units (10) includes a roll support (11) and a support cone (12) disposed on the upper end of the roll support (11). The roll support (11) is provided with a roll placement groove (110) for accommodating the magnetic core roll (100). The support cone (12) protrudes upward, so that when the magnetic core mounting units (10) are stacked axially, the axial spacing space between the magnetic core rolls (100) forms the axial air duct (001).

3. The heat treatment apparatus for amorphous ribbon magnetic cores according to claim 2, characterized in that: The roll support (11) includes a plurality of U-shaped support pieces that are centrally symmetrically distributed. The concave part of the U-shaped support piece forms the roll mounting groove (110). A gap area (112) is formed between any adjacent support pieces on the periphery of the magnetic core roll (100).

4. The heat treatment apparatus for amorphous ribbon magnetic cores according to claim 3, characterized in that: The support cone (12) includes a cone ring (121) and a connecting frame (122). The cone ring (121) is constructed as a circumferentially closed ring structure. The connecting frame (122) connects the cone ring (121) and the drum support (11). The connecting frame (122) includes multiple connecting pieces, and the position of the connecting pieces corresponds to the number and position of the support pieces.

5. The heat treatment apparatus for amorphous ribbon magnetic cores according to claim 4, characterized in that: The number of connecting pieces and support pieces is set to 6 to 8. The bottom center of the roller support (11) is provided with a support groove (111) for positioning in conjunction with the support cone (12) below. The center of the support cone (12) is provided with a through hole (120) that runs vertically through the roller.

6. The heat treatment apparatus for amorphous ribbon magnetic cores according to claim 3, characterized in that: The three inner walls of the "U"-shaped support piece are respectively attached to the bottom surface and the inner and outer walls of the magnetic core drum (100).

7. The heat treatment apparatus for amorphous ribbon magnetic cores according to claim 1, characterized in that: The lower positioning plate (202) is provided with multiple positioning cones (21), and the upper positioning plate (201) is provided with multiple positioning cone grooves (22). The upper and lower ends of the magnetic core mounting bracket are respectively fitted with the positioning cone grooves (22) and the positioning cones (21). Bolt assemblies are provided on the upper positioning plate (201) and the lower positioning plate (202) corresponding to the magnetic core mounting bracket. The bolt assemblies pass through the positioning cones (21), the through holes (120) and the positioning cone grooves (22) to fix the magnetic core mounting bracket between the upper positioning plate (201) and the lower positioning plate (202).

8. The heat treatment apparatus for amorphous ribbon magnetic cores according to claim 1, characterized in that: The ventilation slots (200) are located on the upper positioning plate (201) and the lower positioning plate (202) in the space between the magnetic core mounting bracket. The multiple ventilation slots (200) are connected to the axial air ducts (001) in the positioning fixture (20), and the axial air ducts (001) are connected to the horizontal air ducts (002) to form a three-dimensional grid-like air duct.

9. The heat treatment apparatus for amorphous ribbon magnetic cores according to claim 1, characterized in that: The air guide plate (30) has an air guide cavity (300) inside, and the surface of the air guide plate (30) has an air inlet window (301) and an air outlet window (302). The air guide plate (30) is used to introduce the airflow in the furnace cavity (40) into the air guide cavity (300) through the air inlet window (301), and then distribute it to the ventilation slot (200) through the air outlet window (302).

10. The heat treatment apparatus for amorphous ribbon magnetic cores according to claim 9, characterized in that: The position of the air outlet (302) corresponds to the position of the ventilation slot (200) so as to evenly guide the airflow in the air guide cavity (300) into each of the ventilation slots (200).

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