Magnetic core sintering kiln

Abstract

The invention relates to the field of kilns, in particular to a magnetic core sintering kiln which comprises a kiln body and a track, a hearth penetrating through the kiln body is arranged on the kiln body, electric heating tubes are evenly fixed to the positions, at the hearth, of the kiln body, a cavity is formed in the position, above the hearth, of the kiln body, and the cavity is communicated with the hearth through a plurality of exhaust holes. A cavity is formed in the kiln body, a plurality of smoke outlets are further formed in the kiln body above the cavity, a smoke hood is further arranged above the smoke outlets, the smoke hood is connected with an exhaust pipe through a connecting pipe, an exhaust fan is further arranged on the exhaust pipe, kiln doors are further arranged on the kiln body on the two sides of the hearth, the track penetrates through the hearth, two kiln cars are further arranged on the track, and the two kiln cars are arranged on the track. A metal plate is further fixed to the portion, on the periphery of the hearth, of the kiln body, and a magnetron is further arranged on one side of the kiln body and communicated with the hearth through a metal waveguide. High-temperature sintering is achieved in a microwave mode, sintering is achieved through intermolecular friction driven by microwaves, and energy is greatly saved.

Description

[Technical field]

[0001] The invention relates to the field of kilns, and in particular to a magnetic core sintering kiln. [Background technology]

[0002] Soft ferrite is a magnetic oxide with ferric oxide as the core, which is mainly used in broadband transformers for digital networks and switching power supply transformers. The preparation method of soft magnets adopts a metallurgical preparation method. During its preparation, it needs to go through two sintering processes, one of which is pre-sintering. The main function of pre-sintering is to make the powder after formulation and mixing undergo a preliminary solid-phase reaction at high temperature. After that, a series of processes such as grinding and granulation molding are performed to obtain a molded body, which needs to be sintered later. The main function of sintering is to heat the molded body at high temperature under normal pressure or pressure, so that the particles are combined with each other, thereby improving the strength of the molded body, eliminating the pores between the particles, and improving the strength of the material.

[0003] The existing ferrite permanent magnet sintering kiln is provided with a one-way conveyor belt, and a high-temperature sintering zone is arranged in the middle position of the kiln, and heat exchange zones are arranged on both sides of the high-temperature sintering zone. The magnetic core is pre-sintered in the heat exchange zone, and the pre-sintered magnetic core reaches the high-temperature sintering zone for high-temperature sintering after preliminary solidification. For example, patent application number: CN201910490387.6 discloses a ferrite permanent magnet sintering kiln, a high-temperature sintering zone with an electric heating rod is arranged in the kiln body, and a first heat exchange zone and a second heat exchange zone are arranged on both sides of the high-temperature sintering zone for heat exchange of materials transported from two opposite directions. However, this type of sintering kiln has a high-temperature sintering zone in the middle position, and pre-sintering zones with various temperature differences are arranged at both ends of the high-temperature sintering zone, resulting in that this type of kiln needs to occupy a large area for placement, and the two ends are open, and heat is discharged from both ends with the air, resulting in a lot of heat loss, causing energy waste.

[0004] The present invention is proposed in view of the deficiencies in the prior art. [Summary of the invention]

[0005] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art and provide a magnetic core sintering kiln.

[0006] The present invention can be implemented by the following technical solutions:

[0007] The invention discloses a magnetic core sintering kiln, comprising a kiln body and a track, wherein the kiln body is provided with a furnace penetrating the kiln body, electric heating tubes are evenly fixed on the kiln body at the position of the furnace, a cavity is provided on the kiln body above the furnace, the cavity is connected with the furnace through a plurality of exhaust holes, a plurality of smoke exhaust ports are also provided on the kiln body above the cavity, a smoke hood is also provided above the smoke exhaust port, the smoke hood is connected with the exhaust pipe through a connecting pipe, an exhaust fan is also provided on the exhaust pipe, kiln doors are also provided on the kiln body on both sides of the furnace, the track passes through the furnace, two kiln cars are also provided on the track, a metal plate is also fixed on the kiln body around the furnace, a magnetron is also provided on one side of the kiln body, and the magnetron is connected with the furnace through a metal waveguide. The magnetic cores to be sintered are neatly stacked on the kiln cart. After the kiln cart with the magnetic cores is pushed into the furnace, the kiln doors on both sides of the furnace are closed. The furnace is heated by electric heating tubes to pre-sinter the magnetic cores at low temperature. After the magnetic cores are pre-sintered for a period of time, the electric heating tubes are turned off and the magnetron is turned on. The magnetron generates high-power microwaves. After the microwaves enter the furnace through the waveguide and contact the metal plates, the microwaves are reflected by the metal plates. The microwaves are repeatedly reflected in the furnace between the metal plates and irradiated to various positions in the furnace. The atoms of the material on the magnetic cores are driven to move by the microwaves. Positive and negative atoms move in different directions. Since the electric field in microwaves changes periodically and the time is very short, the microwave frequency is 2.45GHz, and the electric field change period is 2.45 billion cycles per second. The electric field changes repeatedly, causing the molecules to repeatedly rotate left and right and vibrate. The vibrations between molecules collide and rub, generating a large amount of heat, achieving high-temperature sintering. High-temperature sintering is achieved by microwaves, and sintering is achieved by microwave-driven friction between molecules, which greatly saves energy. During sintering, the two sides of the furnace are sealed by the kiln door to further avoid heat loss.

[0008] Preferably, there is a gap between the bottom of the smoke hood and the top of the kiln body.

[0009] Preferably, the kiln car comprises a car plate, and a plurality of wheels rollingly connected to the track are arranged below the car plate.

[0010] Preferably, the kiln body is provided with limit grooves at the positions corresponding to the car plate on both sides of the furnace. After the kiln car enters the furnace, the two ends of the car plate are stuck in the limit grooves, which can effectively prevent heat from being lost downward from the car plate position.

[0011] Preferably, a tungsten plate is further arranged between the metal plate and the kiln body. The tungsten plate absorbs microwaves, thereby preventing microwaves from contacting components outside the furnace and causing damage to the components.

[0012] Preferably, high temperature cotton is fixed on the kiln door, electric heating pipes are also arranged inside the high temperature cotton, and a metal plate is also fixed on one side of the high temperature cotton.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. High-temperature sintering is achieved by microwaves. Microwaves drive the intermolecular friction to achieve sintering, which greatly saves energy. During sintering, both sides of the furnace are sealed by kiln doors to further avoid heat loss.

[0015] 2. Both pre-sintering and high-temperature sintering are carried out in the furnace, which occupies a small area. The magnetic cores are placed in discs and stacked on the kiln car for sintering. A large number of magnetic cores can be sintered at one time, further saving energy.

[0016] 3. After the sintering of the magnetic core on one kiln car is completed, another kiln car is pushed into the furnace for sintering, which can achieve continuous sintering and effectively improve the production efficiency of the magnetic core.

[0017] 4. When the magnetic core is sintered, the heat is transferred to the cavity position, and a high-temperature environment is formed at the cavity position. The harmful substances are evaporated by the high temperature and enter the cavity. The harmful substances are burned again by the high temperature of the cavity. The harmful substances after burning are settled in the cavity, which can effectively avoid polluting the environment. A gap is set between the smoke hood and the kiln body. The outside air enters the smoke hood through the gap and is discharged together with the burned gas, which can effectively avoid the exhaust fan from extracting high-temperature gas from the furnace, further avoiding heat loss.

Brief Description of the Drawings

[0018] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a front view of the present invention;

[0021] Figure 3 for Figure 2 Sectional view at AA;

[0022] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0023] In the figure: 1. kiln body; 2. furnace; 3. electric heating tube; 4. cavity; 5. exhaust hole; 6. smoke outlet; 7. connecting pipe; 8. exhaust pipe; 9. smoke hood; 10. kiln door; 11. high temperature cotton; 12. magnetron; 13. waveguide; 14. track; 15. kiln car; 16. car plate; 17. wheel; 18. gap; 19. metal plate; 20. tungsten plate; 21. limit groove; [Specific implementation method]

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings:

[0025] Embodiment 1:

[0026] like Figures 1 to 4 As shown, the present embodiment discloses a magnetic core sintering kiln, comprising a kiln body 1 and a track 14, a furnace 2 penetrating the kiln body 1 is provided on the kiln body 1, electric heating tubes 3 are evenly fixed on the kiln body 1 at the position of the furnace 2, a cavity 4 is provided on the kiln body 1 above the furnace 2, the cavity 4 is connected with the furnace 2 through a plurality of exhaust holes 5, a plurality of smoke exhaust ports 6 are also provided on the kiln body 1 above the cavity 4, a smoke hood 9 is also provided above the smoke exhaust port 6, the smoke hood 9 is connected to the exhaust pipe 8 through a connecting pipe 7, an exhaust fan (not shown) is also provided on the exhaust pipe 8, kiln doors 10 are also provided on the kiln body 1 on both sides of the furnace 2, the track 14 passes through the furnace 2, two kiln cars 15 are also provided on the track 14, a metal plate 19 is also fixed on the kiln body 1 on the side of the furnace 2, a magnetron 12 is also provided on one side of the kiln body 1, and the magnetron 12 is connected with the furnace 2 through a metal waveguide 13. The magnetic cores to be sintered are neatly stacked on the kiln cart 15, and after the kiln cart 15 with the magnetic cores placed is pushed into the furnace 2, the kiln doors 10 on both sides of the furnace 2 are closed, and the furnace 2 is heated by the electric heating tube 3, and the magnetic cores are pre-sintered at low temperature. After the magnetic cores are pre-sintered for a period of time, the electric heating tube 3 is turned off, and the magnetron 12 is turned on. The magnetron 12 generates high-power microwaves, and the microwaves enter the furnace 2 through the waveguide 13 and contact the metal plate 19, and are reflected by the metal plate 19. The microwaves are repeatedly reflected in the furnace 2 between the metal plates 19, and irradiate various positions in the furnace 2, and pass through the microwave band. The atoms of the material on the moving magnetic core move, and the positive and negative atoms move in different directions. Since the electric field in the microwave changes periodically and the time is very short, the microwave frequency is 2.45GHz, and the electric field change period is 2.45 billion cycles per second. The electric field changes repeatedly, causing the molecules to repeatedly rotate left and right and vibrate. The vibrations between molecules collide and rub, generating a large amount of heat, achieving high-temperature sintering. High-temperature sintering is achieved by microwaves, and sintering is achieved by microwave-driven intermolecular friction, which greatly saves energy. During sintering, the two sides of the furnace 2 are sealed by the kiln door 10 to further avoid heat loss.

[0027] There is a gap 18 between the bottom of the smoke hood 9 and the top of the kiln body 1 .

[0028] The kiln car 15 includes a car plate 16 , and a plurality of wheels 17 rollingly connected to the track 14 are arranged below the car plate 16 .

[0029] Among them, a high temperature cotton 11 is fixed on the kiln door 10 , an electric heating pipe 3 is also arranged in the high temperature cotton 11 , and a metal plate 19 is also fixed on one side of the high temperature cotton 11 .

[0030] Embodiment 2:

[0031] This embodiment discloses a magnetic core sintering kiln. Based on the structure and principle of the first embodiment, a tungsten plate 20 is further provided between the metal plate 19 and the kiln body 1. The tungsten plate 20 absorbs microwaves, thereby preventing microwaves from contacting components outside the furnace 2 and causing damage to the components.

[0032] Embodiment 3:

[0033] This embodiment discloses a magnetic core sintering kiln. Based on the structure and principle of the first or second embodiment, the kiln body 1 of the present embodiment is provided with limit grooves 21 at the positions corresponding to the car plate 16 on both sides of the furnace 2. After the kiln car 15 enters the furnace 2, the two ends of the car plate 16 are inserted into the limit grooves 21, which can effectively prevent heat from being lost downward from the car plate 16.

[0034] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the technical principles of the present invention. These changes, modifications, substitutions and variations should also be regarded as the scope of protection of the present invention.

Claims

1. A magnetic core sintering kiln, comprising a kiln body and a track, characterized in that: The kiln body is provided with a furnace that runs through the kiln body, electric heating tubes are evenly fixed on the kiln body at the position of the furnace, a cavity is provided on the kiln body above the furnace, the cavity is connected with the furnace through a plurality of exhaust holes, a plurality of smoke exhaust ports are also provided on the kiln body above the cavity, a smoke hood is also provided above the smoke exhaust port, the smoke hood is connected to the exhaust pipe through a connecting pipe, an exhaust fan is also provided on the exhaust pipe, kiln doors are also provided on the kiln body on both sides of the furnace, the track passes through the furnace, two kiln cars are also provided on the track, metal plates are also fixed on the kiln body around the furnace, a magnetron is also provided on one side of the kiln body, and the magnetron is connected with the furnace through a metal waveguide.

2. The magnetic core sintering kiln according to claim 1, characterized in that: There is also a gap between the bottom of the smoke hood and the top of the kiln body.

3. The magnetic core sintering kiln according to claim 1, characterized in that: The kiln car comprises a car plate, and a plurality of wheels rollingly connected to the track are arranged below the car plate.

4. The magnetic core sintering kiln according to claim 3, characterized in that: Limiting grooves are arranged on the kiln body at positions corresponding to the car plate on both sides of the furnace.

5. The magnetic core sintering kiln according to claim 1, characterized in that: A tungsten plate is also arranged between the metal plate and the kiln body.

6. The magnetic core sintering kiln according to claim 1, characterized in that: High temperature cotton is fixed on the kiln door, electric heating pipes are also arranged inside the high temperature cotton, and a metal plate is also fixed on one side of the high temperature cotton.

Images