A sintering kiln for alumina ceramic substrates

Abstract

This utility model relates to the field of ceramic sintering technology and discloses an alumina ceramic substrate sintering kiln, including a base and a sintering kiln body. The top of the base is provided with a shelf for placing alumina ceramic substrates, and the shelf can move in and out of the base along the top side of the base. Two limiting rails are fixedly installed on the top side of the base corresponding to the shelf, and the limiting rails serve as the moving path of the shelf. Multiple sets of baffles are provided at the openings on both sides of the sintering kiln body to minimize the heat loss from the kiln. This alumina ceramic substrate sintering kiln can heat and sinter the alumina ceramic substrate from the bottom through heat transfer holes, thereby avoiding uneven heating of the bottom side of the substrate. Furthermore, through the transverse and longitudinal through holes that are interconnected with the heat transfer holes, a three-dimensional heat convection channel can be formed to further optimize the heat distribution, ensure that each substrate layer is heated evenly, and improve the overall sintering quality and forming accuracy.

Description

Technical Field

[0001] This utility model relates to the field of ceramic sintering technology, specifically to an alumina ceramic substrate sintering kiln. Background Technology

[0002] Alumina ceramic substrates are sheet-like support materials made of ceramic materials with alumina as the main component through high-temperature sintering. They are widely used in electronics, power and other fields. Generally, alumina ceramic substrates are sintered in a sintering kiln as a high-temperature calcining furnace.

[0003] For example, the Chinese patent with publication number CN215766414U discloses an alumina ceramic substrate sintering kiln, which mainly solves the problem of poor heating temperature uniformity in the existing sintering kiln. It includes a sintering kiln body and a conveying device. The sintering kiln body has a feed inlet, a discharge outlet, and a sintering chamber connecting the feed inlet and the discharge outlet. The conveying device is located in the sintering chamber. The sintering chamber includes a heating chamber and a cooling chamber. A partition is provided between the heating chamber and the cooling chamber. The partition has a through-hole. A cover is provided in the heating chamber. A heating cavity is formed between the cover and the sintering kiln body. The cover has vent holes connecting the heating cavity and the heating chamber. A row of first through-holes is provided on the cover above the feed inlet. A connecting pipe is provided below the through-hole and communicating with the heating cavity. A row of second through-holes is provided at the upper end of the connecting pipe. Heating pipes are evenly distributed in the heating cavity on the inner surface of the sintering kiln body. An air outlet is provided at the upper end of the heating cavity near the through-hole.

[0004] In the process of realizing this application, the inventors discovered that the technology has at least the following problems: Although the above technical solution can make the multi-layer stacked alumina ceramic substrate heated more evenly and maintain more uniform heating and sintering during the conveying and sintering process, the stacking of alumina ceramic substrates inevitably results in the heating and sintering effect on the side of the alumina ceramic substrates that are in contact with each other not being ideal, which will affect the sintering and forming quality of the alumina ceramic substrate. Therefore, further improvements can be made. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides the following technical solution: an alumina ceramic substrate sintering kiln, comprising a base and a sintering kiln body. A ventilation fan is fixedly installed on the top of the sintering kiln body. A shelf for placing alumina ceramic substrates is provided on the top of the base, and the shelf can move in and out of the sintering kiln body along the top side of the base. Two limiting rails are fixedly installed on the top side of the base corresponding to the shelf, serving as the moving path for the shelf. Multiple sets of baffles are provided at the openings on both sides of the sintering kiln body to reduce heat loss from the kiln. The shelf allows for multi-layer placement and stacking of alumina ceramic substrates, ensuring uniform heating of each layer and improving sintering quality. Furthermore, the use of baffles made of highly insulating material effectively reduces heat loss, maintains a constant temperature environment inside the kiln, and further optimizes the sintering effect.

[0006] As an optimization, the shelf includes multiple independently separated trays and four fixing rods, with the fixing rods fixedly installed at the four corners of the trays. The trays are equidistantly spaced, and evenly distributed nails are fixedly installed on the top side of the trays. These nails are used to support the alumina ceramic substrate. By leaving sufficient gaps between the substrates, heat can be transferred evenly. The nails provide point contact support to the substrates, ensuring that the bottom side of the substrates is not obstructed, thus improving sintering uniformity.

[0007] As an optimization, the tray has several heat transfer holes that run through it, and the heat transfer holes are located between adjacent nails to ensure that heat penetrates evenly.

[0008] As an optimization, the tray has several transverse through holes and several longitudinal through holes inside the tray. The longitudinal through holes are interconnected with the transverse through holes and the heat transfer holes to form a three-dimensional heat convection channel. The heat convection channel optimizes the distribution of sintering heat and ensures that each substrate layer is heated evenly.

[0009] As an optimization, a bracket is fixedly installed at the bottom of the fixed rod, a rotating shaft is rotatably connected to the bottom of the bracket, a roller is rotatably connected to the middle of the rotating shaft, and the roller is rolled within a limiting rail. The limiting rail restricts the movement path of the roller, ensuring that the shelf moves in a straight line.

[0010] As an optimization, a sliding groove is provided through the middle of the limiting rail, and the rotating shaft is rotatably inserted into the sliding groove. A sliding track is provided on the bottom side of the base corresponding to the roller, and the roller is rotatably connected in the sliding track to further guide and limit the roller.

[0011] As an optimization, hooks are fixedly installed on the middle of both sides of the bottom tray. The hooks are used to connect to an external traction device. By pulling the hooks with the traction device, the shelf can be moved in and out of the base 1 for processing.

[0012] As an optimization, a wheel locking assembly for limiting the roller is provided inside the top of the bracket. The wheel locking assembly includes a support plate fixedly installed inside the top of the bracket, a guide rod slidably inserted inside the support plate, a pressure plate fixedly installed at the bottom of the guide rod, a friction plate for increasing friction on the bottom side of the pressure plate, a spring fixedly installed between the pressure plate and the support plate, a screw fixedly installed at the center of the top side of the pressure plate, a sleeve rotatably connected inside the top of the bracket, and the screw screwed inside the sleeve, a bevel gear one fixedly installed at the top of the sleeve, and a rotating rod rotatably connected to the top side of the bracket. A bevel gear two meshing with bevel gear one is fixedly installed at one end of the rotating rod opposite the sleeve. By rotating the rotating rod, the friction plate is tightly contacted with the outside of the roller, thereby locking and limiting it.

[0013] The beneficial effects of this utility model are: This alumina ceramic substrate sintering kiln can heat and sinter the alumina ceramic substrate from the bottom through heat transfer holes, thereby avoiding uneven heating on the bottom side of the substrate. Furthermore, through the transverse and longitudinal through holes that are interconnected with the heat transfer holes, a three-dimensional heat convection channel can be formed to further optimize the heat distribution, ensure that each substrate layer is heated evenly, and improve the overall sintering quality and forming accuracy. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the shelf and limiting rail structure of this utility model; Figure 3 This is a schematic diagram of the structure of the storage rack of this utility model; Figure 4 This is a schematic diagram of the pallet structure of this utility model; Figure 5 This is a schematic diagram of the wheel locking structure for this practical application.

[0015] In the diagram: 1. Base; 2. Sintering kiln body; 3. Ventilation fan; 4. Shelf; 5. Limiting rail; 6. Curtain; 7. Support plate; 8. Fixing rod; 9. Nail column; 10. Heat transfer hole; 11. Horizontal through hole; 12. Longitudinal through hole; 13. Bracket; 14. Rotating shaft; 15. Roller; 16. Slide groove; 17. Slide rail; 18. Hook; 19. Support plate; 20. Guide rod; 21. Pressure plate; 22. Spring; 23. Screw; 24. Sleeve. Detailed Implementation

[0016] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1 A sintering kiln for alumina ceramic substrates includes a base 1 and a sintering kiln body 2. A ventilation fan 3 is fixedly installed on the top of the base 1. A shelf 4 for placing alumina ceramic substrates is provided on the top of the base 1, and the shelf 4 can move in and out of the sintering kiln body 2 along the top side of the base 1. Two limiting rails 5 are fixedly installed on the top side of the base 1 corresponding to the shelf 4, and the limiting rails 5 serve as the moving path of the shelf 4. Multiple sets of baffles 6 are provided at the openings on both sides of the sintering kiln body 2 to reduce heat loss inside the kiln. Alumina ceramic substrates can be stacked in multiple layers through the shelf 4 to ensure that each layer of substrates is heated evenly and improve the sintering quality. Furthermore, the baffles 6, which are made of high heat insulation material, can effectively reduce heat loss, maintain a constant temperature environment inside the kiln, and further optimize the sintering effect. Please see Figure 2-3 The shelf 4 includes multiple independently separated trays 7 and four fixing rods 8. The fixing rods 8 are fixedly installed at the four corners of the trays 7, and the trays 7 are equidistantly arranged. The top side of the trays 7 is fixedly installed with evenly distributed nails 9, which are used to support the alumina ceramic substrate. By ensuring that there is a sufficient gap between the substrates, heat can be transferred evenly. The nails 9 provide point contact support for the substrates, so that the bottom side of the substrates is not blocked, further improving the sintering uniformity and forming accuracy. Please see Figure 3-4The tray 7 has several heat transfer holes 10 through it, and the heat transfer holes 10 are located between adjacent nails 9 to ensure uniform heat penetration. The tray 7 has several transverse through holes 11 through the push plate 7 and several longitudinal through holes 12 through the push plate 7. The longitudinal through holes 12 are interconnected with the transverse through holes 11 and the heat transfer holes 10 to form a three-dimensional heat convection channel, which further optimizes the heat distribution, ensures that each substrate is heated evenly, and improves the overall sintering quality and forming accuracy.

[0019] Please see Figure 2-3 A bracket 13 is fixedly installed at the bottom of the fixed rod 8. A rotating shaft 14 is rotatably connected to the bottom of the bracket 13. A roller 15 is rotatably connected to the middle of the rotating shaft 14. The roller 15 is rotatably connected to the limiting rail 5. A sliding groove 16 is opened through the middle of the limiting rail 5. The rotating shaft 14 is rotatably inserted into the sliding groove 16. A slide rail 17 is opened on the bottom side of the base 1 corresponding to the roller 15. The roller 15 is rotatably connected to the slide rail 17. Please see Figure 2-3 Hooks 18 are fixedly installed on the middle of both sides of the bottom tray 7. The hooks 18 are used to connect to the external traction device. By pulling the hooks 18 through the traction device, the shelf 4 can be pulled in and out of the base 1, which facilitates the sintering process of the alumina ceramic substrate.

[0020] Please see Figure 5 The top of the bracket 13 is equipped with a wheel locking assembly for limiting the position of the roller 15. The wheel locking assembly includes a support plate 19 fixedly installed inside the top of the bracket 13. A guide rod 20 is slidably inserted into the support plate 19. A pressure plate 21 is fixedly installed at the bottom of the guide rod 20. A friction plate for increasing friction is provided on the bottom side of the pressure plate 21. A spring 22 is fixedly installed between the pressure plate 21 and the support plate 19. A screw 23 is fixedly installed in the middle of the top side of the pressure plate 21. A sleeve 24 is rotatably connected inside the top of the bracket 13, and the screw 23 is screwed into it. Inside the sleeve 24, a bevel gear 1 is fixedly installed on the top of the sleeve 24. A rotating rod is rotatably connected to the top side of the bracket 13. A bevel gear 2 that meshes with bevel gear 1 is fixedly installed on one end of the rotating rod relative to the sleeve 24. By turning the rotating rod, bevel gear 1 will be rotated through bevel gear 2, which will in turn drive the sleeve 24 to rotate outside the screw 23. This will cause the pressure plate 21 to move downward, so that the friction plate is in close contact with the outside of the roller 15, thereby locking and limiting it to prevent the roller 15 from rolling accidentally and improving the stability of the shelf.

[0021] In use, the alumina ceramic substrate is first placed on the nail column 9 to suspend the substrate. Then, the hook 18 is connected by the external traction device, which can then pull the shelf 4 to move smoothly into the sintering kiln 2 along the limiting rail 5 and the slide 17. The alumina ceramic substrate can then be fired. At the same time, the airflow in the kiln is regulated by the ventilation fan 3 to ensure uniform temperature and improve sintering quality. After sintering is completed, the shelf is pulled out by the traction device to complete the sintering process. During the sintering process, the alumina ceramic substrate can be heated and sintered from the bottom through the heat transfer hole 10, thereby avoiding uneven heating on the bottom side of the substrate. Furthermore, through the transverse through hole 11 and the longitudinal through hole 12 that are interconnected with the heat transfer hole 10, a three-dimensional heat convection channel can be formed to further optimize the heat distribution. Furthermore, by turning the rotating rod, the first bevel gear will be driven to rotate through the second bevel gear, which in turn will drive the sleeve 24 to rotate outside the screw 23. This will cause the pressure plate 21 to move downward, so that the friction plate is in close contact with the outside of the roller 15, thereby locking and limiting it to prevent the roller 15 from rolling accidentally. This allows the shelf 4 to stop stably in the designated position, improving the stability of the shelf.

[0022] In summary, this alumina ceramic substrate sintering kiln can heat and sinter the alumina ceramic substrate from the bottom through the heat transfer holes 10, thereby avoiding uneven heating on the bottom side of the substrate. Furthermore, through the transverse through holes 11 and the longitudinal through holes 12 that are interconnected with the heat transfer holes 10, a three-dimensional heat convection channel can be formed, further optimizing the heat distribution, ensuring that each substrate layer is heated uniformly, and improving the overall sintering quality and forming accuracy.

[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings.

[0025] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A sintering kiln for alumina ceramic substrates, comprising a base (1) and a sintering kiln body (2), wherein a ventilation fan (3) is fixedly installed on the top of the sintering kiln body (2), characterized in that: The top of the base (1) is provided with a shelf (4) for placing alumina ceramic substrates, and the shelf (4) can move in and out of the sintering kiln body (2) along the top side of the base (1). Two limiting rails (5) are fixedly installed on the top side of the base (1) corresponding to the shelf (4). The limiting rails (5) serve as the moving path of the shelf (4). Multiple sets of baffles (6) are provided at the openings on both sides of the sintering kiln body (2) to reduce the heat loss inside the kiln. The shelf (4) includes multiple independently separated trays (7) and four fixing rods (8), and the fixing rods (8) are fixedly installed at the four corners of the trays (7), and the trays (7) are equidistantly arranged. The top side of the trays (7) is fixedly installed with evenly distributed nail posts (9), and the nail posts (9) are used to support the alumina ceramic substrate. The tray (7) has several heat transfer holes (10) that are opened through it, and the heat transfer holes (10) are located between adjacent nails (9) to ensure that heat is evenly penetrated. The tray (7) has a transverse through hole (11) that passes through the tray and a longitudinal through hole (12) that passes through the tray. The longitudinal through hole (12) is connected to the transverse through hole (11) and the heat transfer hole (10) to form a three-dimensional heat convection channel.

2. The alumina ceramic substrate sintering kiln according to claim 1, characterized in that: A bracket (13) is fixedly installed at the bottom of the fixed rod (8). A rotating shaft (14) is rotatably connected to the bottom of the bracket (13). A roller (15) is rotatably connected to the middle of the rotating shaft (14), and the roller (15) is rotatably connected to the limiting rail (5).

3. The alumina ceramic substrate sintering kiln according to claim 2, characterized in that: The limiting rail (5) has a through groove (16) in the middle, and the rotating shaft (14) is rotatably inserted into the groove (16). The base (1) has a slide (17) on the bottom side corresponding to the roller (15), and the roller (15) is rotatably connected in the slide (17).

4. The alumina ceramic substrate sintering kiln according to claim 3, characterized in that: Hooks (18) are fixedly installed on the middle of both sides of the bottom tray (7), and the hooks (18) are used to connect the external traction device.

5. The alumina ceramic substrate sintering kiln according to claim 3, characterized in that: The top of the bracket (13) is provided with a wheel locking assembly for limiting the roller (15). The wheel locking assembly includes a support plate (19) fixedly installed in the top of the bracket (13). A guide rod (20) is slidably inserted into the support plate (19). A pressure plate (21) is fixedly installed at the bottom of the guide rod (20). A friction plate for increasing friction is provided on the bottom side of the pressure plate (21). A spring (22) is fixedly installed between the pressure plate (21) and the support plate (19). A screw (23) is fixedly installed in the middle of the top side of the pressure plate (21). A sleeve (24) is rotatably connected in the top of the bracket (13). The screw (23) is screwed into the sleeve (24). A bevel gear one is fixedly installed in the top of the sleeve (24). A rotating rod is rotatably connected to the top side of the bracket (13). A bevel gear two that meshes with bevel gear one is fixedly installed at one end of the rotating rod relative to the sleeve (24).

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