A multi-stage atmosphere balancing sintering kiln

Abstract

The present application relates to sintering kiln design technical field, disclose a kind of multi-section balanced atmosphere sintering kiln, including first roller bed frame, kiln is set on first roller bed frame, further include the second roller bed frame being set in the kiln feed inlet position, second roller bed frame is provided with preheating box butting with kiln, both sides of kiln are provided with wrapping cover, wrapping cover is provided with heating element for preheating kiln in, wrapping cover and preheating box between are provided with heat supply assembly for the part of heat energy in wrapping cover is transported to preheating box inside.By heat supply assembly, part of heat energy in wrapping cover can be transported to preheating box inside, to preheat the effect of material in preheating box, to reduce the thermal shock after material into kiln, avoid soft magnetic ferrite blank crack due to temperature difference abrupt change;Final can realize the dual role of wrapping cover and heating element.

Description

Technical Field

[0001] This invention relates to the field of sintering kiln design technology, and in particular to a multi-stage balanced atmosphere sintering kiln. Background Technology

[0002] A balanced atmosphere sintering kiln is a type of furnace equipment used for high-temperature sintering of materials in a specific gaseous environment (i.e., a balanced atmosphere). It is an important type of atmosphere sintering furnace, and its core feature lies in the precise control of the type, partial pressure, and flow rate of the gas inside the furnace, so that the atmosphere inside the furnace reaches and maintains a certain chemical equilibrium state during the sintering process, thereby achieving precise control over the sintering quality and performance of the materials.

[0003] Soft magnetic ferrite materials are ferrimagnetic oxides with Fe2O3 as the main component, manufactured using powder metallurgy. They are a class of soft magnetic functional materials with a coercivity of no more than 1000 A / m. Their core systems include Mn-Zn, Ni-Zn, and Cu-Zn, possessing characteristics such as low coercivity, high resistivity, and low eddy current loss. They are mainly used in electronic components operating under high-frequency, weak-field conditions, and are core magnetic core materials for devices such as transformers and communication filters.

[0004] For sintering kilns of soft magnetic ferrite materials, balanced atmosphere control must be adopted. This is a core process requirement to ensure that the magnetic properties of the product are up to standard. During the sintering process of soft magnetic ferrite, atmospheric parameters such as oxygen partial pressure need to be precisely matched with the thermodynamic equilibrium state of the material system to avoid problems such as excessive oxidation and zinc volatilization. Otherwise, key performances such as magnetic permeability and loss will not meet the standards.

[0005] Currently, Chinese patent CN223737002U, published on December 30, 2025, discloses a gradient-heating chain sintering kiln, including a kiln body, a front support, and a rear support. Inlet and outlet ports are located on the left and right sides of the kiln body. Frame grooves are formed at the upper ends of the front and rear supports, and a chain conveyor belt is installed within these grooves, passing through the inlet and outlet ports. A rotating shaft is located within the front support, positioned on one side of the chain conveyor belt and detachably connected to the front support. Two spiral brushes are fitted on the outer side of the rotating shaft, fixedly connected to the rotating shaft and in contact with the chain conveyor belt. The two spiral brushes have opposite spiral directions. The chain conveyor belt transports the workpiece. During transport, a power unit controls the rotation of the rotating shaft. The two spiral brushes on the rotating shaft have opposite spiral directions. As the spiral brushes rotate, friction causes impurities to detach from both sides of the conveyor belt. This spiral brush rotation cleaning method ensures thorough cleaning without dead angles and higher slag discharge efficiency, preventing continuous residue adhesion.

[0006] When the billet of soft magnetic ferrite material enters the furnace, the rapid heating can easily cause the gas inside the billet to expand rapidly, resulting in problems such as heating cracks and uneven cross-sections. Summary of the Invention

[0007] The purpose of this invention is to provide a multi-stage balanced atmosphere sintering kiln that can preheat materials.

[0008] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a multi-stage balanced atmosphere sintering kiln, including a first roller frame, a kiln set on the first roller frame, and a second roller frame set at the kiln feed inlet. A preheating box connected to the kiln is set on the second roller frame. Both sides of the kiln are provided with a wrapping cover. A heating element for preheating the kiln is set inside the wrapping cover. A heating component for transferring a portion of the heat energy inside the wrapping cover to the preheating box is set between the wrapping cover and the preheating box.

[0009] By adopting the above technical solution, before the kiln is put into use, the heating elements installed inside the wrapping covers on both sides of the kiln can preheat the kiln before use, thereby enabling all parts of the kiln to reach thermal equilibrium in advance and avoiding large temperature fluctuations during subsequent formal production. In particular, the preheating box on the second roller conveyor frame, and the heating components installed between the wrapping covers and the preheating box, can transfer a portion of the heat energy inside the wrapping covers to the preheating box, thereby preheating the material inside the preheating box, so as to reduce the thermal shock of the material after entering the kiln and prevent the soft magnetic ferrite blanks from cracking due to sudden temperature changes. In the end, the dual function of the wrapping covers and the heating elements can be realized.

[0010] A further embodiment of the present invention is that the heating assembly includes a heating pipe disposed on the upper side of the cover, multiple connecting pipes whose upper ends are connected to the heating pipe and whose lower ends are connected to the cover, an air inlet hole opened on the lower side of the cover, an air intake fan disposed at the end of the heating pipe and used to input external airflow into the heating pipe, and a collecting pipe connected to the ends of the two heating pipes and extending into the preheating box.

[0011] By adopting the above technical solution, an air intake fan is used to deliver external airflow into the heating pipe. At this time, a negative pressure is formed at the connection pipe position. Then, air can enter through the air intake hole and take away some of the heat inside the enclosure. The hot airflow can then enter the heating pipe from the connection pipe, thereby forming a hot airflow inside the heating pipe. The hot airflow can then enter the preheating box through the collecting pipe.

[0012] A further configuration of the present invention is as follows: the first roller conveyor and the second roller conveyor are arranged in an L-shape, and a support is provided at one end of the preheating box near the kiln. A thrust cylinder is provided on the support for pushing the material waiting in the second roller conveyor into the first roller conveyor.

[0013] By adopting the above technical solution, when the material passes through the first roller conveyor and the preheating box and needs to enter the second roller conveyor and the kiln, the material in the first roller conveyor can be pushed into the second roller conveyor by the thrust cylinder.

[0014] A further provision of the present invention includes: multiple operating ports on the side wall of the preheating chamber; a sealing door at each operating port; a hot air duct located above the operating ports inside the preheating chamber; a centrifugal fan between the hot air duct and the collecting pipe for introducing hot air from the collecting pipe into the hot air duct; multiple first injection holes on the side of the hot air duct for obliquely spraying hot air towards the material location; and multiple second injection holes on the lower side of the hot air duct for vertically spraying hot air into the operating ports; and a switching assembly inside the preheating chamber; when the sealing door is opened, the switching assembly switches the hot air duct to spray from the second injection holes; when the sealing door is closed, the switching assembly switches the hot air duct to spray from the first injection holes.

[0015] By adopting the above technical solution, during the use of the preheating box, multiple operating ports and a sealed door are used. By opening the sealed door, the materials inside the preheating box can be adjusted and retrieved at the operating port. At the same time, the sealing door can also be opened for troubleshooting and maintenance inside the preheating box. A centrifugal fan is used to introduce the hot air from the collecting pipe into the hot air duct. When the sealed door is opened, the switching component switches the hot air duct to the second jet hole, which sprays air vertically downwards, thus forming an airflow barrier at the operating port and reducing the amount of cold air from the outside entering the preheating box. At the same time, when the sealed door is closed, the switching component switches the hot air duct to the first jet hole, which sprays air at an angle onto the materials being transported at the center of the preheating box, thereby performing efficient preheating treatment on the materials.

[0016] A further feature of the present invention is that: two connecting ears are provided on the side of the sealing door, and a door hinge rotatably connected to the operation port is fixed between the two connecting ears; the hot air pipe includes a main pipe located above the operation port and a connecting pipe located between the two main pipes with an outer diameter smaller than that of the main pipe; the switching assembly includes a rotating sleeve sleeved on the main pipe, a plurality of docking holes formed on the rotating sleeve for docking with the first or second injection hole, and a linkage component disposed between the rotating sleeve and the door hinge.

[0017] By adopting the above technical solution, when the sealing door is opened, the sealing door drives the door shaft to rotate, and the door shaft can drive the rotating sleeve to rotate through the linkage. After the docking hole on the rotating sleeve rotates, it can be used to dock with the first spray hole or the second spray hole respectively, thereby controlling the opening and closing of the first spray hole and the second spray hole.

[0018] A further configuration of the present invention is as follows: the linkage includes a sleeve disposed at the end of the rotating sleeve, a first gear disposed around the sleeve, a first bevel gear connected to the upper end of the door shaft and located on one side of the first gear, a first rotating shaft rotatably connected inside the preheating box and located on one side of the first gear, a second bevel gear connected to the end of the first rotating shaft and meshing with the first bevel gear, and a second gear connected to the first rotating shaft and meshing with the first gear.

[0019] By adopting the above technical solution, when the door hinge rotates, the door hinge can drive the first bevel gear to rotate, the first bevel gear can drive the first rotating shaft and the second gear to rotate through the second bevel gear, and the second gear can drive the rotating sleeve to rotate through the first gear and the sleeve.

[0020] A further provision of the present invention is that: a pressurizing component is provided on the hot air pipe, and when the docking hole and the second injection hole are docked, the pressurizing component blocks the connecting pipe at the open sealing door position; the pressurizing component includes a first mesh plate located inside the main pipe and attached to the end of the connecting pipe, a second mesh plate disposed inside the end of the connecting pipe and used in conjunction with the first mesh plate, a first fixing ear disposed at the upper end of the first mesh plate, a first magnet block disposed on the upper side of the first fixing ear, an opening opened on the upper inner wall of the main pipe and corresponding to the position above the first magnet block, a second magnet block disposed on the inner wall of the rotating sleeve and repelling the first magnet block, a second fixing ear disposed at the lower end of the first mesh plate, and a return spring disposed on the lower side of the second fixing ear.

[0021] By adopting the above technical solution, when the docking hole and the second injection hole are docked and an airflow barrier needs to be formed at the lower operating port, an additional barrier needs to be added at the operating port to form a strong airflow. At this time, using the first mesh plate in the main pipeline and the second mesh plate in the connecting pipeline, after the docking hole and the second injection hole are docked, the second magnet moves to the opening position on the main pipeline. At this time, the repulsive force generated between the second magnet and the first magnet can drive the first mesh plate to move down, and the return spring is compressed, so that the meshes of the first mesh plate and the second mesh plate are misaligned. Finally, the connecting pipeline can be blocked by the first mesh plate and the second mesh plate. At this time, the airflow in the hot air pipe no longer continues to advance along the connecting pipeline, and the airflow can be concentrated at the operating port to form a high-pressure airflow barrier. When the sealing door is closed and the docking hole aligns with the first spray hole, the second magnet moves away from above the first magnet, and then the reset spring recovers its elasticity. The reset spring then pushes the first mesh plate upward, so that the meshes of the first and second mesh plates are aligned, thus opening the connecting pipe.

[0022] A further feature of the present invention is that a central hole is provided at the center of the second fixing ear, a guide post passing through the reset spring and the central hole is provided in the main pipeline, and a guide rail for the side of the first mesh plate to be embedded is provided on the inner wall of the end of the main pipeline.

[0023] By adopting the above technical solution, the second fixing ear uses the central hole for the guide post to pass through, and the guide post passes through the reset spring. At this time, it can play a guiding and limiting role for the reset spring. At the same time, the inner wall of the main pipeline end uses the guide rail for the side of the first mesh plate to be embedded, thereby playing a guiding role for the up and down movement of the first mesh plate.

[0024] A further provision of the present invention is as follows: a guide plate is provided on the lower side of the operating port, and a driving assembly is provided in the preheating box. When the sealing door is opened, the driving assembly drives the guide plate to flip and be in an inclined state. The driving assembly includes an installation shaft fixed to the end of the guide plate and rotatably connected to the inner wall of the operating port, a third gear provided on the installation shaft, a second rotating shaft rotatably connected to the inner wall of the operating port, a fourth gear connected to the second rotating shaft and meshing with the third gear, a third bevel gear connected to the end of the second rotating shaft, and a fourth bevel gear connected to the lower end of the door shaft and meshing with the third bevel gear.

[0025] By adopting the above technical solution, since the environment inside the operating port is hot and the environment outside the operating port is cold, cold air sinks while hot air rises. Therefore, cold air is more likely to penetrate into the operating port at the lower position. At the same time, since the air pressure is lower at the lower position of the airflow barrier, cold air is more likely to penetrate. At this time, using the guide plate installed on the lower side of the operating port, when the main pipeline forms a downward airflow barrier at the operating port position, the rotation of the door hinge will also drive the fourth bevel gear to rotate. The fourth bevel gear can then drive the second rotating shaft to rotate through the third bevel gear. The second rotating shaft can then drive the mounting shaft to rotate through the meshing of the fourth and third gears. The mounting shaft can then drive the guide plate to rotate to the inclined position. At this time, the inclined guide plate can guide the airflow to the outside of the operating port, thereby forming an outward blowing wall below the operating port. Ultimately, this reduces the amount of cold air entering the operating port from below, increasing the blocking effect of the airflow barrier.

[0026] A further feature of the present invention is that a reset torsion spring is fitted at the lower end of the door hinge, with one end connected to the connecting ear and the other end connected to the inner wall of the operating port. When the reset torsion spring is in its natural state, the sealing door rotates outward by 90 degrees and its side is attached to the inner wall of the operating port.

[0027] By adopting the above technical solution, when the sealing door is unlocked, under the elastic restoring force of the reset torsion spring, the sealing door can automatically open 90 degrees and its side fits against the inner wall of the operating port, thereby positioning the opening and closing angle of the sealing door, which is conducive to positioning the docking hole and the guide plate.

[0028] The beneficial effects of this invention are as follows: Before the kiln is put into use, the heating elements installed inside the wrapping covers on both sides of the kiln can preheat the kiln before use, thereby enabling all parts of the kiln to reach thermal equilibrium in advance and avoiding large temperature fluctuations during subsequent formal production; the preheating box on the second roller conveyor frame and the heating components installed between the wrapping covers and the preheating box use an air intake fan to deliver external airflow into the heating pipe. At this time, a negative pressure is formed at the connecting pipe position, and then air can enter through the air inlet and carry away some of the heat inside the wrapping covers. The hot airflow can then enter the heating pipe from the connecting pipe, thereby forming a hot airflow in the heating pipe. The hot airflow can then enter the preheating box through the collecting pipe, thereby preheating the material in the preheating box, so as to reduce the thermal shock of the material after entering the kiln and avoid cracking of the soft magnetic ferrite blanks due to sudden temperature changes; ultimately, the dual function of the wrapping covers and the heating elements can be achieved. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial cross-sectional view of the connection relationship between the cover and the heating component in this invention; Figure 3 This is a partial top view of the structure of the present invention, in which the centrifugal fan and hot air pipe inside the preheating box are indicated by dashed lines; Figure 4 This is a schematic diagram of the preheating box in this invention, in which one of the sealed doors is in the open state; Figure 5 yes Figure 4 Enlarged view of section A in the middle; Figure 6 This is a cross-sectional view of the preheating box in this invention. At this time, a sealed door is in the open state, and the airflow direction of the airflow barrier is indicated by arrows. Figure 7 This is a partially enlarged view of the connection relationship between the hot air duct and the switching component in this invention; Figure 8 This is a cross-sectional view showing the connection relationship between the hot air duct and the switching component in this invention; Figure 9This is a cross-sectional view of the main pipeline in the present invention located at the position of the booster assembly. At this time, the docking hole and the second injection hole are docked, while the first mesh plate and the second mesh plate are misaligned, and the connecting pipeline is blocked. Figure 10 This is a cross-sectional plan view of the main pipeline in the present invention located at the position of the booster assembly. At this time, the docking hole and the first injection hole are docked, while the first mesh plate and the second mesh plate are in an overlapping state, and the connecting pipeline is opened. Figure 11 This is a partial structural cross-sectional view of the preheating box located at the guide plate position in this invention.

[0031] In the diagram, 1. First roller conveyor; 11. Kiln; 12. Wrapping cover; 121. Heating element; 2. Second roller conveyor; 3. Preheating box; 31. Support; 311. Thrust cylinder; 32. Operating port; 33. Sealing door; 331. Connecting lug; 332. Door hinge; 3321. Return torsion spring; 34. Centrifugal fan; 4. Heating assembly; 41. Heating pipe; 42. Connecting pipe; 43. Air inlet; 44. Air inlet fan; 45. Collecting pipe; 5. Hot air pipe; 501. First injection hole; 502. Second injection hole; 51. Main pipeline; 511. Guide column; 512. Guide rail; 52. Connecting pipeline; 6. Switching assembly; 61. 62. Rotating sleeve; 63. Connecting hole; 64. Linkage component; 65. Tube sleeve; 66. First gear; 67. First bevel gear; 68. First rotating shaft; 69. Second bevel gear; 60. Second gear; 71. Pressurization assembly; 72. First mesh plate; 73. Second mesh plate; 74. First fixing ear; 75. First magnet block; 76. Opening; 77. Second magnet block; 78. Second fixing ear; 79. Center hole; 70. Return spring; 8. Guide plate; 91. Drive assembly; 92. Mounting shaft; 93. Second rotating shaft; 94. Fourth gear; 95. Third bevel gear; 96. Fourth bevel gear. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] A multi-stage balanced atmosphere sintering kiln, referring to Figure 1The multi-stage balanced atmosphere sintering kiln includes a first roller frame 1, a kiln 11 set on the first roller frame 1, and a second roller frame 2 set at the feed inlet of the kiln 11. The second roller frame 2 is provided with a preheating box 3 that is connected to the kiln 11. The first roller frame 1 and the second roller frame 2 are arranged in an L-shape. The preheating box 3 is provided with a support 31 at one end near the kiln 11. At the same time, the support 31 is provided with a thrust cylinder 311 for pushing the material waiting in the second roller frame 2 into the first roller frame 1.

[0034] Reference Figure 1 , Figure 2 , Figure 3 Both sides of the kiln 11 are equipped with a covering 12, and a heating element 121 for preheating the kiln 11 is installed inside the covering 12. This heating element 121 is a resistance wire, and an insulation layer is also provided inside the covering 12. A heating assembly 4 for transferring a portion of the heat energy inside the covering 12 to the preheating box 3 is also provided between the covering 12 and the preheating box 3. This heating assembly 4 includes a heating pipe 41, a connecting pipe 42, an air inlet 43, an air inlet fan 44, and a collecting pipe 45. The heating pipe 41 is mounted on the upper side of the cover 12, and multiple connecting pipes 42 are provided. The upper end of the multiple connecting pipes 42 is connected to the heating pipe 41 and the lower end is connected to the cover 12. Meanwhile, multiple air inlets 43 are opened on the lower side of the cover 12 in a horizontal direction. The air intake fan 44 is installed and fixed at the end of the heating pipe 41 and is used to input the external airflow into the heating pipe 41. The collecting pipe 45 is connected to the ends of the two heating pipes 41 and extends into the preheating box 3.

[0035] Reference Figure 1 , Figure 3 , Figure 4 , Figure 5 The preheating box 3 has multiple operating ports 32 on its side wall, and a sealing door 33 is installed at each operating port 32. The sealing door 33 is equipped with a door lock for locking inside the operating port 32. Two connecting ears 331 are welded to the side of the sealing door 33, and a door hinge 332 is fixed between the two connecting ears 331 and rotatably connected inside the operating port 32. At the same time, a hot air pipe 5 is installed inside the preheating box 3 and above the operating port 32. The hot air pipe 5 includes a main pipe 51 located above the operating port 32 and a connecting pipe 52 located between the two main pipes 51 with an outer diameter smaller than that of the main pipe 51. A centrifugal fan 34 is installed between the hot air pipe 5 and the collecting pipe 45 to introduce the hot air flow in the collecting pipe 45 into the hot air pipe 5.

[0036] Reference Figure 6 , Figure 7 , Figure 8The hot air duct 5 has multiple first injection holes 501 on the side of the main pipeline 51 for inclined injection of hot air towards the material location, while the hot air duct 5 has multiple second injection holes 502 on the lower side of the main pipeline 51 for vertical injection of hot air towards the operation port 32. A switching assembly 6 is installed inside the preheating box 3. When the sealing door 33 is opened, the switching assembly 6 switches the hot air duct 5 to the second injection holes 502 for injection; when the sealing door 33 is closed, the switching assembly 6 switches the hot air duct 5 to the first injection holes 501 for injection. This switching assembly 6 includes a rotating sleeve 61 fitted onto the main pipeline 51, multiple docking holes 62 on the rotating sleeve 61 for docking with the first injection holes 501 or the second injection holes 502, and a... The linkage 63 between the rotating sleeve 61 and the door hinge 332 includes a sleeve 631, a first gear 632, a first bevel gear 633, a first rotating shaft 634, a second bevel gear 635, and a second gear 636. The sleeve 631 is integrally disposed at the end of the rotating sleeve 61, while the first gear 632 is fixed to the periphery of the sleeve 631. The first bevel gear 633 is keyed to the upper end of the door hinge 332 and is located on one side of the first gear 632. The first rotating shaft 634 is rotatably connected to the inside of the preheating box 3 and is located on one side of the first gear 632. The second bevel gear 635 is keyed to the end of the first rotating shaft 634 and meshes with the first bevel gear 633, while the second gear 636 is keyed to the first rotating shaft 634 and meshes with the first gear 632.

[0037] Reference Figure 7 , Figure 9 , Figure 10The hot air duct 5 is also equipped with a pressurizing component 7. When the docking hole 62 and the second jet hole 502 are docked, the pressurizing component 7 seals the connecting pipe 52 at the open position of the sealing door 33. This pressurizing component 7 includes a first mesh plate 71, a second mesh plate 72, a first fixing ear 73, a first magnet 74, an opening 75, a second magnet 76, a second fixing ear 77, and a return spring 78. The first mesh plate 71 is located inside the main pipe 51 and fits against the end of the connecting pipe 52, while the second mesh plate 72 is fixed inside the end of the connecting pipe 52 and works in conjunction with the first mesh plate 71. At the same time, the first fixing ear 73 is welded to the upper end of the first mesh plate 71, and the first magnet 76... 4. The first fixing ear 73 is bonded and fixed on the upper side, wherein the opening 75 is opened on the upper inner wall of the main pipe 51 and corresponds to the position above the first magnet 74, and the second magnet 76 is bonded and fixed on the inner wall of the rotating sleeve 61 and repels the first magnet 74. At the same time, the second fixing ear 77 is welded to the lower end of the first mesh plate 71, and the return spring 78 is set on the lower side of the second fixing ear 77. The center hole 771 is opened at the center of the second fixing ear 77, and the guide post 511 passing through the return spring 78 and the center hole 771 is welded into the main pipe 51. At the same time, the guide rail 512 for the side of the first mesh plate 71 to be embedded is welded on the inner wall of the end of the main pipe 51, and the cross section of the guide rail 512 is L-shaped.

[0038] Reference Figure 5 , Figure 6 , Figure 11 A guide plate 8 is rotatably connected to the lower side of the operating port 32, and a drive assembly 9 is installed inside the preheating box 3. When the sealing door 33 is opened, the drive assembly 9 drives the guide plate 8 to flip and tilt. When the sealing door 33 is closed, the drive assembly 9 drives the guide plate 8 to flip to a vertical position. This drive assembly 9 includes a mounting shaft 91, a third gear 92, a second rotating shaft 93, a fourth gear 94, a third bevel gear 95, and a fourth bevel gear 96. The mounting shaft 91 is fixed to the end of the guide plate 8 and rotatably connected to the inner wall of the operating port 32 via a bearing, while the third gear 92 is keyed to the mounting shaft 91. Meanwhile, the second rotating shaft 93 is rotatably connected to the inner wall of the operating port 32, and the fourth gear 94 is keyed to the second rotating shaft 93 and meshes with the third gear 92. The third bevel gear 95 is keyed to the end of the second rotating shaft 93, and the fourth bevel gear 96 is keyed to the lower end of the door hinge 332 and meshes with the third bevel gear 95. At the same time, the lower end of the door hinge 332 is also fitted with a reset torsion spring 3321, one end of which is fixedly connected to the connecting ear 331 and the other end of which is fixedly connected to the inner wall of the operating port 32. When the reset torsion spring 3321 is in its natural state, the sealing door 33 flips outward by 90 degrees and its side is attached to the inner wall of the operating port 32.

[0039] Principle: Before the kiln 11 is put into use, heating elements 121 are installed inside the side covers 12 on both sides of the kiln 11. The heating elements 121 can preheat the kiln 11 before use, so that all parts of the kiln 11 reach thermal equilibrium in advance, avoiding large temperature fluctuations during subsequent formal production. The preheating box 3 on the second roller conveyor 2, and the heating assembly 4 between the cover 12 and the preheating box 3, uses an intake fan 44 to deliver external airflow into the heating pipe 41. A negative pressure is formed at the connecting pipe 42, allowing air to enter through the air inlet 43 and carry away some of the heat inside the cover 12. The hot airflow then enters the heating pipe 41 from the connecting pipe 42, forming a hot airflow inside the heating pipe 41. The hot airflow then enters the preheating box 3 through the collecting pipe 45, thus preheating the material inside the preheating box 3 to reduce the thermal shock after the material enters the kiln and prevent the soft magnetic ferrite blank from cracking due to sudden temperature changes. Ultimately, the dual function of the cover 12 and the heating element 121 can be achieved. During the use of the preheating box 3, multiple operating ports 32 and a sealing door 33 are utilized. Opening the sealing door 33 allows for the adjustment and retrieval of materials within the preheating box 3 through the operating ports 32. Simultaneously, the sealing door 33 can be opened for troubleshooting and maintenance within the preheating box 3. A centrifugal fan 34 introduces the hot airflow from the collecting pipe 45 into the hot air duct 5. When the sealing door 33 is opened, it drives the door shaft 332 to rotate, which in turn drives the first bevel gear 633. The first bevel gear 633, through the second bevel gear 635, drives the first rotating shaft 634 and the second gear 636 to rotate. The second gear 636, through the first gear 632 and the sleeve 631, drives the rotating sleeve 61 to rotate. The docking hole 62 on the rotating sleeve 61 rotates to connect with the second injection hole. 502, the second jet hole 502 can spray air vertically downward, thereby forming an airflow barrier at the operation port 32 position, reducing the amount of cold air from the outside entering the preheating box 3; when the docking hole 62 and the second jet hole 502 are docked, the second magnet 76 moves to the opening 75 position on the main pipeline 51. At this time, the repulsive force generated between the second magnet 76 and the first magnet 74 can drive the first mesh plate 71 to move downward, and the return spring 78 is compressed, so that the mesh of the first mesh plate 71 and the second mesh plate 72 are misaligned. Finally, the first mesh plate 71 and the second mesh plate 72 can complete the sealing of the connecting pipeline 52. At this time, the airflow in the hot air pipe 5 no longer continues to advance along the connecting pipeline 52, and the airflow can be concentrated at the operation port 32 position to form a high-pressure airflow barrier; Simultaneously, when the sealing door 33 is closed, the sealing door 33 drives the door shaft 332 to rotate in the reverse direction. The door shaft 332 then drives the first bevel gear 633 to rotate. The first bevel gear 633 then drives the first rotating shaft 634 and the second gear 636 to rotate through the second bevel gear 635. The second gear 636 then drives the rotating sleeve 61 to rotate through the first gear 632 and the sleeve 631. After the docking hole 62 on the rotating sleeve 61 rotates, it can dock with the first spray hole 501. The first spray hole 501 can then spray obliquely onto the material conveyed at the center of the preheating box 3, thereby performing efficient preheating treatment on the material. When the sealing door 33 is closed and the docking hole 62 docks with the first spray hole 501, the second magnet 76 moves away from the first magnet 74. Then the return spring 78 can elastically recover and push the first mesh plate 71 to move upward, so that the mesh of the first mesh plate 71 and the second mesh plate 72 are in an overlapping state. At this time, the connecting pipe 52 can be opened. Since the environment inside the operating port 32 is hot, while the environment outside is cold, cold air sinks and hot air rises. Therefore, cold air is more likely to penetrate into the operating port 32 at the lower part. At the same time, because the air pressure is lower at the lower part of the airflow barrier, cold air can penetrate even more easily. At this time, using the guide plate 8 installed on the lower side of the operating port 32, when the main pipeline 51 forms a downward airflow barrier at the operating port 32, the rotation of the door hinge 332 will also drive the fourth bevel gear 96 to rotate. The fourth bevel gear 96 can drive the second rotating shaft 93 to rotate through the third bevel gear 95. The second rotating shaft 93 can drive the mounting shaft 91 to rotate through the meshing of the fourth gear 94 and the third gear 92. The mounting shaft 91 can then drive the guide plate 8 to rotate to the inclined position. At this time, the inclined guide plate 8 can guide the airflow to the outside of the operating port 32, thereby forming an outward blowing wall below the operating port 32. Ultimately, this reduces the amount of cold air entering the operating port 32 from below, increasing the blocking effect of the airflow barrier.

Claims

1. A multi-stage balanced atmosphere sintering kiln, comprising a first roller conveyor (1) and a kiln (11) disposed on the first roller conveyor (1), characterized in that: It also includes a second roller conveyor (2) set at the feed inlet of the kiln (11), and a preheating box (3) connected to the kiln (11) is set on the second roller conveyor (2). Both sides of the kiln (11) are provided with a cover (12). The cover (12) is provided with a heating element (121) for preheating the kiln (11). A heating component (4) for transferring a portion of the heat energy in the cover (12) to the preheating box (3) is provided between the cover (12) and the preheating box (3).

2. The multi-stage balanced atmosphere sintering kiln according to claim 1, characterized in that: The heating assembly (4) includes a heating pipe (41) disposed on the upper side of the cover (12), multiple connecting pipes (42) whose upper ends are connected to the heating pipe (41) and whose lower ends are connected to the cover (12), an air inlet (43) opened on the lower side of the cover (12), an air intake fan (44) disposed at the end of the heating pipe (41) and used to input external airflow into the heating pipe (41), and a collecting pipe (45) connected to the ends of the two heating pipes (41) and extending into the preheating box (3).

3. The multi-stage balanced atmosphere sintering kiln according to claim 1, characterized in that: The first roller frame (1) and the second roller frame (2) are arranged in an L-shape. The preheating box (3) is provided with a support (31) at one end near the kiln (11). The support (31) is provided with a thrust cylinder (311) for pushing the material waiting in the second roller frame (2) into the first roller frame (1).

4. A multi-stage balanced atmosphere sintering kiln according to claim 2, characterized in that: The preheating box (3) has multiple operating ports (32) on its side wall. A sealing door (33) is provided at each operating port (32). A hot air duct (5) is provided inside the preheating box (3) and above the operating port (32). A centrifugal fan (34) is provided between the hot air duct (5) and the collecting pipe (45) to introduce the hot air flow in the collecting pipe (45) into the hot air duct (5). Multiple oblique spraying points are provided on the side of the hot air duct (5) for spraying towards the material. The hot air pipe (5) has a first jet hole (501) for spraying hot air vertically into the operating port (32) and a second jet hole (502) for spraying hot air vertically into the operating port (32) at the lower side of the hot air pipe (5). The preheating box (3) is equipped with a switching component (6). When the sealing door (33) is opened, the switching component (6) switches the hot air pipe (5) to the second jet hole (502) for spraying hot air. When the sealing door (33) is closed, the switching component (6) switches the hot air pipe (5) to the first jet hole (501) for spraying hot air.

5. A multi-stage balanced atmosphere sintering kiln according to claim 4, characterized in that: The sealing door (33) has two connecting ears (331) on its side. A door hinge (332) is fixed between the two connecting ears (331) and rotatably connected to the operation port (32). The hot air pipe (5) includes a main pipe (51) located above the operation port (32) and a connecting pipe (52) located between the two main pipes (51) with an outer diameter smaller than that of the main pipe (51). The switching assembly (6) includes a rotating sleeve (61) sleeved on the main pipe (51), a plurality of docking holes (62) opened on the rotating sleeve (61) for docking with the first injection hole (501) or the second injection hole (502), and a linkage (63) disposed between the rotating sleeve (61) and the door hinge (332).

6. A multi-stage balanced atmosphere sintering kiln according to claim 5, characterized in that: The linkage (63) includes a sleeve (631) disposed at the end of the rotating sleeve (61), a first gear (632) disposed around the sleeve (631), a first bevel gear (633) connected to the upper end of the door hinge (332) and located on one side of the first gear (632), a first rotating shaft (634) rotatably connected inside the preheating box (3) and located on one side of the first gear (632), a second bevel gear (635) connected to the end of the first rotating shaft (634) and meshing with the first bevel gear (633), and a second gear (636) connected to the first rotating shaft (634) and meshing with the first gear (632).

7. A multi-stage balanced atmosphere sintering kiln according to claim 6, characterized in that: A pressurizing assembly (7) is provided on the hot air duct (5). When the docking hole (62) and the second jet hole (502) are docked, the pressurizing assembly (7) seals the connecting pipe (52) at the position of the open sealing door (33). The pressurizing assembly (7) includes a first mesh plate (71) located in the main pipe (51) and attached to the end of the connecting pipe (52), a second mesh plate (72) disposed in the end of the connecting pipe (52) and used in conjunction with the first mesh plate (71), and a second mesh plate (72) disposed in the first... The first fixing ear (73) at the upper end of the perforated plate (71), the first magnet block (74) set on the upper side of the first fixing ear (73), the opening (75) opened on the upper inner wall of the main pipeline (51) and corresponding to the position above the first magnet block (74), the second magnet block (76) set on the inner wall of the rotating sleeve (61) and repelling the first magnet block (74), the second fixing ear (77) set at the lower end of the first perforated plate (71), and the return spring (78) set on the lower side of the second fixing ear (77).

8. A multi-stage balanced atmosphere sintering kiln according to claim 7, characterized in that: The second fixing ear (77) has a central hole (771) at its center. The main pipeline (51) is provided with a guide post (511) that passes through the reset spring (78) and the central hole (771). The inner wall of the end of the main pipeline (51) is provided with a guide rail (512) for the side of the first mesh plate (71) to be embedded.

9. A multi-stage balanced atmosphere sintering kiln according to claim 5, characterized in that: A guide plate (8) is provided on the lower side of the operation port (32), and a drive assembly (9) is provided in the preheating box (3). When the sealing door (33) is opened, the drive assembly (9) drives the guide plate (8) to flip and be in an inclined state. The drive assembly (9) includes an installation shaft (91) fixed to the end of the guide plate (8) and rotatably connected to the inner wall of the operation port (32), a third gear (92) provided on the installation shaft (91), a second rotating shaft (93) rotatably connected to the inner wall of the operation port (32), a fourth gear (94) connected to the second rotating shaft (93) and meshing with the third gear (92), a third bevel gear (95) connected to the end of the second rotating shaft (93), and a fourth bevel gear (96) connected to the lower end of the door hinge (332) and meshing with the third bevel gear (95).

10. A multi-stage balanced atmosphere sintering kiln according to claim 9, characterized in that: The lower end of the door hinge (332) is fitted with a reset torsion spring (3321) with one end connected to the connecting ear (331) and the other end connected to the inner wall of the operating port (32). When the reset torsion spring (3321) is in its natural state, the sealing door (33) flips outward by 90 degrees and its side is attached to the inner wall of the operating port (32).

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