Alumina ceramic sintering furnace

Abstract

The application relates to an alumina ceramic sintering furnace and relates to the technical field of alumina ceramic preparation equipment, which comprises a furnace body. The application can realize the effect of uniform heating on both sides by arranging electric heating elements on both sides of the furnace body, effectively reduces the temperature gradient in the furnace, and further makes the same batch of ceramic green bodies be heated more uniformly. Then, the temperature sensor arranged at the bottom of the furnace body can accurately monitor the temperature in the furnace in real time, and data is fed back to a control system, so that the heating power can be adjusted in time, the temperature control precision is further improved, subsequently, the high-temperature-resistant corundum mullite bricks in the inner layer of the furnace body shell have good high-temperature resistance and thermal stability and can withstand a high-temperature sintering environment, the nanometer alumina fiber insulation cotton filled in the middle layer can effectively reduce heat loss and improve energy utilization efficiency, and the subsequent outer layer of stainless steel plates enhances the overall strength and durability of the furnace body.

Description

Technical Field

[0001] This application relates to the field of alumina ceramic preparation equipment, and in particular to an alumina ceramic sintering furnace. Background Technology

[0002] As a key piece of equipment in the alumina ceramic preparation process, the performance and stability of the sintering furnace directly affect the quality and yield of ceramic products.

[0003] Regarding the aforementioned technologies, existing traditional sintering furnaces mostly employ single-sided or localized heating methods, resulting in large temperature gradients within the furnace. This leads to inconsistent sintering degrees within the same batch of ceramic green bodies, causing some products to be prone to cracking and deformation. This significantly reduces the accuracy of temperature control and brings many inconveniences to users. Utility Model Content

[0004] The purpose of this application is to provide an alumina ceramic sintering furnace with the advantage of precise temperature control, which solves the problems mentioned in the background art.

[0005] The alumina ceramic sintering furnace provided in this application adopts the following technical solution: it includes a furnace body, electric heating elements are fixedly installed on both sides of the furnace body, a temperature sensor is provided on the bottom surface of the furnace body, the inner layer of the outer shell of the furnace body is high-temperature resistant corundum mullite brick, the middle layer of the outer shell of the furnace body is filled with nano-grade alumina fiber insulation cotton, and the outer layer of the outer shell of the furnace body is stainless steel plate. A hydraulic cylinder is fixedly installed on the top surface of the furnace body. One end of the hydraulic rod inside the hydraulic cylinder is fixedly connected to a first support plate. A furnace cover is fixedly connected to the bottom of the first support plate. A silicone rubber sealing ring is provided on the side of the furnace cover. A high-temperature resistant graphite sealing ring is provided on the side of the silicone rubber sealing ring. By adopting the above technical solution and setting heating elements on both sides of the furnace body, a uniform heating effect on both sides can be achieved, effectively reducing the temperature gradient inside the furnace. This results in more uniform heating of the same batch of ceramic greenware. Furthermore, a temperature sensor at the bottom of the furnace body can accurately monitor the furnace temperature in real time and feed the data back to the control system for timely adjustment of heating power, further improving temperature control accuracy. Finally, the high-temperature resistant corundum-mullite bricks in the inner layer of the furnace shell have excellent high-temperature resistance and thermal stability, capable of withstanding high-temperature sintering environments, while the middle layer is filled with nano-grade alumina fiber insulation. The cotton effectively reduces heat loss and improves energy efficiency. The outer stainless steel plate enhances the overall strength and durability of the furnace body. By setting up a hydraulic cylinder, the hydraulic cylinder at the top of the furnace body can drive the hydraulic rod, thereby enabling the first support plate and the furnace cover to move left and right, facilitating the opening and closing of the furnace body. The silicone rubber sealing ring and high-temperature resistant graphite sealing ring on the side of the furnace cover have a double sealing design, effectively preventing heat leakage and the entry of outside air, ensuring the stability of the sintering environment inside the furnace, thus solving the problems of large temperature gradient, low temperature control accuracy, and easy cracking and deformation of products in traditional sintering furnaces.

[0006] Preferably, two fixing blocks are fixedly connected to both sides of the furnace body, and a fixing cylinder is fixedly connected inside each of the two sets of fixing blocks. A movable rod is slidably connected inside the fixing cylinder, and a second support plate is fixedly connected to one end of the movable rod. The second support plate is fixedly connected to the surface of the furnace cover. By adopting the above technical solution, a stable support structure is formed by setting fixed blocks, fixed cylinders, movable rods and second support plates on both sides of the furnace body. When the furnace cover needs to be opened or closed, the movable rod can slide inside the fixed cylinder, thereby driving the second support plate and the furnace cover to move smoothly. This not only enhances the stability of the furnace cover movement, but also avoids damage to the furnace body that may be caused by unstable furnace cover movement.

[0007] Preferably, a pipe is fixedly connected to the top surface of the furnace body, and a pressure gauge is installed on the top surface of the pipe; By adopting the above technical solution, and by setting up pipelines and pressure gauges at the top of the pipelines, the pressure inside the furnace can be monitored in real time. Then, the operator can understand the pressure changes inside the furnace in a timely manner based on the readings of the pressure gauges. When abnormal pressure fluctuations occur, corresponding measures can be taken quickly, such as adjusting the air intake or exhaust volume, to ensure that the pressure inside the furnace is always within a suitable range and to ensure the stable progress of the alumina ceramic sintering process.

[0008] Preferably, a fixing ring is fixedly connected to the surface of the pipe, and a plurality of screws are threadedly connected to the side of the fixing ring; By adopting the above technical solution, and by setting a fixed ring plate and threading several screws on the side of the fixed ring plate, when it is necessary to connect the sintering furnace to the external piping system, simply align the connection end of the external pipe with the fixed ring plate, and then tighten each screw to make the external pipe fit tightly with the fixed ring plate, thereby establishing a stable and reliable connection. This connection method is not only easy to operate, but also effectively prevents gas leakage, ensures the stability of the pressure inside the furnace, and ensures the normal operation of the sintering process.

[0009] Preferably, a plurality of support legs are fixedly connected to the bottom surface of the furnace body, and a silicone pad is fixedly connected to the bottom of the support legs; By adopting the above technical solution, and by setting up support legs and fixing silicone pads at the bottom of the support legs, the vibration generated by the furnace body can be effectively absorbed and buffered during the operation of the sintering furnace, reducing the adverse effects of vibration on the internal structure of the furnace body and surrounding equipment.

[0010] Preferably, a warning strip is fixedly connected to the side of the support leg; By adopting the above technical solution and setting up warning strips, operators can be reminded of the position of the support legs by the eye-catching color or reflective properties of the warning strips in the dark or when personnel are not paying attention, so as to avoid injury to the operators caused by the sintering furnace due to collision.

[0011] Preferably, a high-purity alumina ceramic plate is fitted onto the inner wall surface of the furnace body, and several support blocks are fixedly connected to the side of the high-purity alumina ceramic plate. Bolts are threadedly connected to the inside of the support blocks and the inside of the furnace body. By adopting the above technical solution, and by setting high-purity alumina ceramic plates and using support blocks and bolts to firmly connect them to the furnace body, the excellent high-temperature resistance and corrosion resistance of the high-purity alumina ceramic plates can effectively protect the inner wall of the furnace from the erosion of high temperature and chemical substances during the sintering process. At the same time, its smooth surface can reduce the adhesion of materials to the furnace wall, making it easier to clean and maintain, and ensuring the purity of the sintering process and the stability of product quality.

[0012] Preferably, the inside of the pipe is coated with an anti-adhesion layer; By adopting the above technical solution and setting an anti-adhesion layer, the adhesion of materials or impurities to the inner wall of the pipe can be effectively reduced during the exhaust process, avoiding pipe blockage caused by long-term use, and thus ensuring the smooth flow of the exhaust system.

[0013] In summary, this application includes at least one of the following beneficial technical effects: This alumina ceramic sintering furnace achieves uniform heating from both sides by incorporating heating elements on both sides of the furnace body. This effectively reduces the temperature gradient within the furnace, resulting in more even heating of the same batch of ceramic green bodies. Furthermore, a temperature sensor at the bottom of the furnace body accurately monitors the furnace temperature in real time and feeds the data back to the control system for timely adjustments to the heating power, further improving temperature control precision. Finally, the inner layer of the furnace shell is made of high-temperature resistant corundum-mullite bricks, which possess excellent high-temperature resistance and thermal stability, allowing it to withstand high-temperature sintering environments. The middle layer is filled with nano-sized alumina fiber insulation. The cotton effectively reduces heat loss and improves energy efficiency. The outer stainless steel plate enhances the overall strength and durability of the furnace body. By setting up a hydraulic cylinder, the hydraulic cylinder at the top of the furnace body can drive the hydraulic rod, thereby enabling the first support plate and the furnace cover to move left and right, facilitating the opening and closing of the furnace body. The silicone rubber sealing ring and high-temperature resistant graphite sealing ring on the side of the furnace cover have a double sealing design, effectively preventing heat leakage and the entry of outside air, ensuring the stability of the sintering environment inside the furnace, thus solving the problems of large temperature gradient, low temperature control accuracy, and easy cracking and deformation of products in traditional sintering furnaces. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall front view structure of this application; Figure 2 for Figure 1 A partial side view of the furnace body; Figure 3 for Figure 1 A side view of the furnace body and the high-purity alumina ceramic plate. Figure 4 for Figure 1 Schematic diagram of the central pipe and fixed ring plate from the side; Figure 5 for Figure 1 Enlarged structural diagram at point A in the middle.

[0015] In the picture: 1. Furnace body; 2. Hydraulic cylinder; 3. Fixing block; 4. Fixing cylinder; 5. Movable rod; 6. First support plate; 7. Furnace cover; 8. Pipeline; 9. Pressure gauge; 10. Fixing ring; 11. Support leg; 12. Silicone pad; 13. Warning strip; 14. Heating element; 15. High-temperature resistant corundum mullite brick; 16. Nano-grade alumina fiber insulation cotton; 17. Stainless steel plate; 18. High-purity alumina ceramic plate; 19. Supporting block; 20. Bolt; 21. Screw; 22. High-temperature resistant graphite sealing ring; 23. Silicone rubber sealing ring; 24. Temperature sensor; 25. Second support plate; 26. Anti-adhesion layer. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0017] Example 1: An alumina ceramic sintering furnace, referring to... Figure 1 , Figure 2 and Figure 5 The furnace body 1 includes a furnace body 1, with heating elements 14 fixedly installed on both sides of the furnace body 1, a temperature sensor 24 installed on the bottom surface of the furnace body 1, the inner layer of the outer shell of the furnace body 1 being a high-temperature resistant corundum mullite brick 15, the middle layer of the outer shell of the furnace body 1 being filled with nano-grade alumina fiber insulation cotton 16, and the outer layer of the outer shell of the furnace body 1 being a stainless steel plate 17. A hydraulic cylinder 2 is fixedly installed on the top surface of the furnace body 1. One end of the hydraulic rod inside the hydraulic cylinder 2 is fixedly connected to a first support plate 6. A furnace cover 7 is fixedly connected to the bottom of the first support plate 6. A silicone rubber sealing ring 23 is provided on the side of the furnace cover 7, and a high-temperature resistant graphite sealing ring 22 is provided on the side of the silicone rubber sealing ring 23. By setting the electric heating elements 14 on both sides of the furnace body 1, the effect of uniform heating on both sides can be achieved, effectively reducing the temperature gradient inside the furnace, thereby making the same batch of ceramic greenware more evenly heated. Then, the temperature sensor 24 set at the bottom of the furnace body 1 can monitor the temperature inside the furnace in real time and feed the data back to the control system so as to adjust the heating power in time, further improving the temperature control accuracy. Subsequently, the high-temperature resistant corundum mullite brick 15 of the inner layer of the outer shell of the furnace body 1... It has good high temperature resistance and thermal stability, and can withstand high temperature sintering environment. The middle layer filled with nano-grade alumina fiber insulation cotton 16 can effectively reduce heat loss and improve energy utilization efficiency. The outer stainless steel plate 17 enhances the overall strength and durability of the furnace body 1. By setting hydraulic cylinder 2, the hydraulic cylinder 2 at the top of the furnace body 1 can drive the hydraulic rod, thereby enabling the first support plate 6 and the furnace cover 7 to move left and right, which facilitates the opening and closing of the furnace body 1. The silicone rubber sealing ring 23 and high temperature resistant graphite sealing ring 22 on the side of the furnace cover 7 have a double sealing design function, which effectively prevents heat leakage and the entry of outside air, and ensures the stability of the sintering environment inside the furnace. This solves the problems of large temperature gradient, low temperature control accuracy and easy cracking and deformation of products in traditional sintering furnaces.

[0018] Please see Figure 1Two fixing blocks 3 are fixedly connected to both sides of the furnace body 1. A fixing cylinder 4 is fixedly connected inside each of the two fixing blocks 3. A movable rod 5 is slidably connected inside the fixing cylinder 4. One end of the movable rod 5 is fixedly connected to a second support plate 25, which is fixedly connected to the surface of the furnace cover 7. By setting the fixing blocks 3, fixing cylinders 4, movable rods 5, and second support plates 25 on both sides of the furnace body 1, a stable support structure is formed. When the furnace cover 7 needs to be opened or closed, the movable rod 5 can slide inside the fixing cylinder 4, thereby driving the second support plate 25 and the furnace cover 7 to move smoothly. This not only strengthens the furnace cover... The stability of the movement of the cover 7 also avoids potential damage to the furnace body 1 caused by unstable movement of the cover 7. A pipe 8 is fixedly connected to the top surface of the furnace body 1, and a pressure gauge 9 is installed on the top surface of the pipe 8. By setting the pipe 8 and the pressure gauge 9 on the top of the pipe 8, the pressure inside the furnace body 1 can be monitored in real time. Then, the operator can understand the pressure changes inside the furnace in a timely manner according to the display value of the pressure gauge 9. When abnormal pressure fluctuations occur, corresponding measures can be taken quickly, namely adjusting the air intake or exhaust volume, to ensure that the pressure inside the furnace is always within a suitable range and to ensure the stable progress of the alumina ceramic sintering process.

[0019] Please see Figure 1 and Figure 4 A fixing ring plate 10 is fixedly connected to the surface of the pipe 8. Several screws 21 are threadedly connected to the side of the fixing ring plate 10. By setting the fixing ring plate 10 and threading several screws 21 on the side of the fixing ring plate 10, when it is necessary to connect the sintering furnace to the external pipe 8 system, simply align the connection end of the external pipe 8 with the fixing ring plate 10, and then tighten each screw 21 to make the external pipe 8 and the fixing ring plate 10 fit tightly, thereby establishing a stable and reliable connection. This connection method is not only easy to operate, but also effectively prevents gas leakage, ensures the stability of the pressure inside the furnace and the normal operation of the sintering process. Several support legs 11 are fixedly connected to the bottom surface of the furnace body 1. Silicone pads 12 are fixedly connected to the bottom of the support legs 11. By setting the support legs 11 and fixing silicone pads 12 to the bottom of the support legs 11, the vibration generated by the furnace body 1 can be effectively absorbed and buffered during the operation of the sintering furnace, reducing the adverse effects of vibration on the internal structure of the furnace body 1 and the surrounding equipment.

[0020] Please see Figure 1 , Figure 3 and Figure 4A warning strip 13 is fixedly connected to the side of the support leg 11. By setting the warning strip 13, the operator is alerted to the position of the support leg 11 in low light or when personnel are not paying attention, thanks to the conspicuous color or reflective properties of the warning strip 13, thus preventing injury to the operator from the sintering furnace due to collision. A high-purity alumina ceramic plate 18 is fitted onto the inner wall surface of the furnace body 1. Several support blocks 19 are fixedly connected to the side of the high-purity alumina ceramic plate 18. Bolts 20 are threadedly connected to the inside of the support blocks 19 and the inside of the furnace body 1. By setting the high-purity alumina ceramic plate 18 and utilizing the support blocks 19 and bolts 20... The high-purity alumina ceramic plate 18 is securely connected to the furnace body 1. During the sintering process, the excellent high-temperature resistance and corrosion resistance of the high-purity alumina ceramic plate 18 effectively protects the inner wall of the furnace body 1 from the erosion of high temperature and chemical substances. At the same time, its smooth surface can reduce the adhesion of materials to the furnace wall, making it easy to clean and maintain, and ensuring the purity of the sintering process and the stability of product quality. The inside of the pipe 8 is coated with an anti-adhesion layer 26. By setting the anti-adhesion layer 26, the adhesion of materials or impurities to the inner wall of the pipe 8 can be effectively reduced during the exhaust process, avoiding the problem of pipe 8 blockage caused by long-term use, thereby ensuring the smooth flow of the exhaust system.

[0021] The implementation principle of this application embodiment is as follows: First, the operator places the alumina ceramic green body into the furnace body 1, ensuring that the high-purity alumina ceramic plate 18 lining is flat. It is then fixed to the support block 19 with bolts 20 to prevent direct contact between the green body and the furnace body 1, ensuring a clean sintering environment. Next, the hydraulic cylinder 2 is activated, and the hydraulic rod drives the first support plate 6 and the furnace cover 7 to move. Simultaneously, the movable rod 5 slides within the fixed cylinder 4, assisting in the smooth closing of the furnace cover 7. Subsequently, the silicone rubber sealing ring 23 and the high-temperature resistant graphite sealing ring 22 on the side of the furnace cover 7 are tightly fitted to the furnace body 1, forming a double seal to prevent outside air from entering or the furnace atmosphere from leaking. Then, an external gas source is connected through the pipe 8. The pipe 8 is securely connected using the fixing ring 10 and screws 21. Before turning on the gas source, the pressure gauge 9 is observed, and the gas intake is adjusted to bring the furnace pressure to the required sintering range. Meanwhile, the anti-adhesion layer 26 reduces the accumulation of impurities within the pipe 8. After ensuring smooth airflow, the electric heating elements 14 on both sides of the furnace body 1 are activated for dual-sided heating. The temperature sensor 24 at the bottom monitors the furnace temperature in real time and feeds it back to the control system. The system then dynamically adjusts the power of the electric heating elements 14 based on the feedback to reduce the temperature gradient inside the furnace and ensure uniform heating of the green body. At the same time, the high-temperature resistant corundum mullite bricks 15, nano-grade alumina fiber insulation cotton 16, and stainless steel plate 17 of the furnace body 1 work together to reduce heat loss and maintain a stable high temperature inside the furnace. During the sintering process, the silicone pads 12 at the bottom of the support legs 11 buffer the vibration of the furnace body 1, and the warning strips 13 remind the operators to pay attention to the position of the equipment and avoid collisions. The pressure gauge 9 is monitored in real time. If the pressure is abnormal, the air intake or exhaust volume is adjusted to maintain stability. Finally, after sintering is completed, the electric heating elements 14 are turned off. After the temperature inside the furnace drops to a safe range, the hydraulic cylinder 2 is activated to open the furnace cover 7 and remove the sintered ceramic products. After a period of use, the bolt 20 can be loosened to remove the high-purity alumina ceramic plate 18, which can then be cleaned or replaced.

Claims

1. An alumina ceramic sintering furnace, comprising a furnace body (1), characterized in that: Electric heating elements (14) are fixedly installed on both sides of the furnace body (1). A temperature sensor (24) is provided on the bottom surface of the furnace body (1). The inner layer of the outer shell of the furnace body (1) is a high-temperature resistant corundum mullite brick (15). The middle layer of the outer shell of the furnace body (1) is filled with nano-grade alumina fiber insulation cotton (16). The outer layer of the outer shell of the furnace body (1) is a stainless steel plate (17). A hydraulic cylinder (2) is fixedly installed on the top surface of the furnace body (1). One end of the hydraulic rod inside the hydraulic cylinder (2) is fixedly connected to a first support plate (6). A furnace cover (7) is fixedly connected to the bottom of the first support plate (6). A silicone rubber sealing ring (23) is provided on the side of the furnace cover (7). A high-temperature resistant graphite sealing ring (22) is provided on the side of the silicone rubber sealing ring (23).

2. The alumina ceramic sintering furnace according to claim 1, characterized in that: Two fixing blocks (3) are fixedly connected to both sides of the furnace body (1). A fixing cylinder (4) is fixedly connected inside each of the two sets of fixing blocks (3). A movable rod (5) is slidably connected inside the fixing cylinder (4). A second support plate (25) is fixedly connected to one end of the movable rod (5). The second support plate (25) is fixedly connected to the surface of the furnace cover (7).

3. The alumina ceramic sintering furnace according to claim 1, characterized in that: A pipe (8) is fixedly connected to the top surface of the furnace body (1), and a pressure gauge (9) is installed on the top surface of the pipe (8).

4. The alumina ceramic sintering furnace according to claim 3, characterized in that: The surface of the pipe (8) is fixedly connected to a fixing ring (10), and the side of the fixing ring (10) is threaded with several screws (21).

5. The alumina ceramic sintering furnace according to claim 1, characterized in that: The bottom surface of the furnace body (1) is fixedly connected with a number of support legs (11), and the bottom of the support legs (11) is fixedly connected with silicone pads (12).

6. An alumina ceramic sintering furnace according to claim 5, characterized in that: A warning strip (13) is fixedly connected to the side of the support leg (11).

7. The alumina ceramic sintering furnace according to claim 1, characterized in that: The inner wall surface of the furnace body (1) is fitted with a high-purity alumina ceramic plate (18), and a number of support blocks (19) are fixedly connected to the side of the high-purity alumina ceramic plate (18). The inside of the support block (19) is threadedly connected to the inside of the furnace body (1) with bolts (20).

8. An alumina ceramic sintering furnace according to claim 3, characterized in that: The inside of the pipe (8) is coated with an anti-adhesion layer (26).

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