Batch sintering box for ceramic products

Abstract

The utility model discloses a batch sintering box for ceramic products. The batch sintering box comprises a furnace body, a heating assembly, a gas circulation system, an atmosphere regulation and control module, a conveying mechanism and a waste heat recovery device. The interior of the furnace body is divided into a preheating area, a high-temperature sintering area and a cooling area which are separated through partition plates, and channel doors capable of being opened and closed are arranged in the middles of the partition plates; the heating assembly is composed of a resistance heating pipe and a heat-conducting fin. The surface of the heat-conducting fin is provided with a protruding structure, and the protruding structure and the heating pipe form a 30-degree inclined face. The gas circulation system comprises a main fan, an auxiliary fan and an annular air duct, and an arc-shaped guide plate is arranged in the air duct; the atmosphere regulation and control module comprises a gas sensor, a gas mixing cavity and a nozzle array; the conveying mechanism comprises a conveying belt, a guide rail and a supporting frame. The waste heat recovery device comprises a heat exchanger and a spiral heat exchange tube; the heating uniformity, the temperature stability and the energy utilization efficiency can be remarkably improved, and the defects of ceramic products are reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of ceramic sintering equipment, and in particular to a batch sintering box for ceramic products. Background Technology

[0002] With the development of ceramic sintering technology, various sintering equipment has been widely used in industrial production. However, these devices still have some problems in actual use. For example, sintering boxes on the market generally suffer from uneven heating, high energy consumption, and complex operation, leading to unstable product quality and low production efficiency. In addition, some existing equipment lacks effective temperature control and gas circulation systems during multi-batch continuous sintering processes, which can easily cause defects such as product warping and oxidation, affecting yield and performance consistency.

[0003] The existing CN114370754B describes a walking beam box-type three-dimensional sintering furnace, published on 2023-05-30. This design arranges the pre-baking zone, high-temperature zone, and cooling zone sequentially from top to bottom, and uses a material frame assembly to transport the workpieces, improving space utilization and thermal energy efficiency. Furthermore, it utilizes a high-temperature circulating fan to achieve heat circulation in the high-temperature zone, enhancing energy efficiency. However, this design still has significant limitations: firstly, its loading and unloading zones are located at both ends of the furnace body, requiring interruptions to the sintering process during loading and unloading, affecting continuous operation efficiency; secondly, its cooling zone uses independent air supply and exhaust systems, failing to effectively recover waste heat, resulting in energy waste; and thirdly, for ceramic materials requiring precise temperature control, this device lacks real-time monitoring and control functions for atmosphere composition, making it difficult to meet the high-quality sintering requirements of high-performance ceramic products.

[0004] The aforementioned problems indicate that current ceramic sintering equipment on the market still has significant room for improvement in terms of heating uniformity, energy efficiency, automation level, and process adaptability. Therefore, this invention provides a batch sintering box for ceramic products to overcome these shortcomings and offer a more efficient, energy-saving, and intelligently controlled solution. Utility Model Content

[0005] The purpose of this invention is to provide a batch sintering box for ceramic products to overcome the shortcomings of the existing technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A batch sintering box for ceramic products includes a furnace body, a heating assembly, a gas circulation system, an atmosphere control module, a conveying mechanism, and a waste heat recovery device. The furnace body is divided into a preheating zone, a high-temperature sintering zone, and a cooling zone, separated by partitions. Each partition has an openable / closable passageway in the center. The heating assembly is installed on the side wall of the high-temperature sintering zone and includes several groups of parallel-arranged resistance heating tubes. Each group of resistance heating tubes is connected by heat-conducting plates. The surface of the heat-conducting plates has several evenly distributed protrusions to increase the heat radiation area. The heat-conducting plates and the resistance heating tubes form an inclined surface with an angle of 30°. The gas circulation system includes a main fan located at the top of the high-temperature sintering zone and an auxiliary fan at the bottom. The main fan and the auxiliary fan are connected by an annular duct. Several guide plates are installed within the annular duct. The guide plates are arc-shaped and run along... The air ducts are evenly distributed circumferentially, and the radius of curvature of the guide plates is 1.5 times the diameter of the air ducts. The atmosphere control module is located at the top of the high-temperature sintering zone and includes a gas sensor, a gas mixing chamber, and a nozzle array. The gas mixing chamber is connected to an external gas source through a pipe, and the nozzle array is evenly arranged along the length of the high-temperature sintering zone. Each nozzle is equipped with an independent flow regulating valve. The conveying mechanism includes a conveyor belt that runs through the furnace body. Guide rails are provided on both sides of the conveyor belt, and several movable support frames are installed on the guide rails. Rollers are provided at the bottom of the support frames and are tumblingly connected to the guide rails. A tray is provided on the top of the support frames to support ceramic products. The waste heat recovery device includes a heat exchanger located at the rear end of the cooling zone. The heat exchanger has spiral heat exchange tubes inside, and the two ends of the heat exchange tubes are connected to the air outlet of the cooling zone and the air inlet of the preheating zone, respectively.

[0008] A further preferred embodiment: the outer surface of the resistance heating tube is coated with an infrared reflective coating with a thickness of 0.2 mm; the heat-conducting sheet is made of aluminum alloy with a thickness of 3 mm; and a thermal grease layer with a thickness of 0.1 mm is provided on the contact surface between the heat-conducting sheet and the resistance heating tube.

[0009] A further preferred embodiment: the blades of both the main fan and the auxiliary fan are hyperbolic, the radius of curvature of the blades is 0.6 times the diameter of the fan, the rotation speed of the main fan is 1500 r / min, the rotation speed of the auxiliary fan is 1200 r / min, and the rotation directions of the main fan and the auxiliary fan are opposite.

[0010] A further preferred embodiment: the gas mixing chamber is equipped with a stirring shaft, on which several stirring blades are mounted. The stirring blades are inclined at an angle of 45°. A filter screen is provided at the outlet of the gas mixing chamber, and the filter screen has a pore size of 0.5 mm.

[0011] A further preferred embodiment: the number of support frames is 10, the spacing between adjacent support frames is 20cm, the height of the support frame is 30cm, the diameter of the roller is 5cm, and the coefficient of friction between the roller and the guide rail is 0.05.

[0012] A further preferred embodiment: the outer shell of the heat exchanger is rectangular, with a length, width and height of 80cm, 60cm and 50cm respectively, the heat exchange tube is made of stainless steel, with an outer diameter of 2cm, a wall thickness of 0.5mm and a pitch of 5cm.

[0013] The structure and implementation principle of this utility model are as follows: the preheating zone, high-temperature sintering zone and cooling zone inside the furnace are separated by partitions. The passage door in the middle of the partition opens when the conveyor belt is running to allow the support frame to pass through. The heating components in the high-temperature sintering zone achieve uniform heating through a combination of resistance heating tubes and heat-conducting plates. The raised structure on the surface of the heat-conducting plates increases the heat radiation area. The inclined surface between the heat-conducting plates and the resistance heating tubes optimizes the heat transfer path. The main fan and auxiliary fan of the gas circulation system achieve gas circulation in the high-temperature sintering zone through an annular air duct. The guide plate guides the airflow to form a stable vortex to improve temperature uniformity. The gas sensor of the atmosphere control module monitors the atmosphere composition in the high-temperature sintering zone in real time and performs precise control through the nozzle array. The support frame of the conveying mechanism moves along the guide rail through rollers to carry ceramic products. The waste heat recovery device in the cooling zone transfers the heat discharged from the cooling zone to the preheating zone through a heat exchanger to improve energy utilization efficiency.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. By using the raised structure and inclined surface design of the heat-conducting plate, the heat radiation efficiency and heat transfer uniformity of the heating component are significantly improved, solving the problem of uneven heating in existing equipment;

[0016] 2. The stable vortex formed by the main and auxiliary fans of the gas circulation system in conjunction with the guide plate effectively improves the temperature uniformity in the high-temperature sintering zone and reduces warping and oxidation defects in ceramic products.

[0017] 3. The waste heat recovery device achieves efficient recovery of waste heat in the cooling zone through the design of spiral heat exchange tubes, which reduces energy consumption and improves the overall energy utilization rate of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a partially enlarged schematic diagram of the heating component and gas circulation system of this utility model;

[0020] Figure 3This is a schematic diagram of the atmosphere control module structure of this utility model;

[0021] Figure 4 This is a detailed schematic diagram of the conveying mechanism and support frame of this utility model;

[0022] Figure 5 This is a schematic diagram of the waste heat recovery device of this utility model;

[0023] Figure 6 This is a cross-sectional view of the connection between the heat-conducting sheet and the resistance heating tube of this utility model.

[0024] The attached figures are labeled as follows:

[0025] 1. Furnace body; 2. Preheating zone; 3. High-temperature sintering zone; 4. Cooling zone; 5. Baffle plate; 6. Passageway door; 7. Resistance heating tube; 8. Heat-conducting plate; 9. Raised structure; 10. Inclined surface; 11. Infrared reflective coating; 12. Thermal grease layer; 13. Main fan; 14. Auxiliary fan; 15. Annular air duct; 16. Guide plate; 17. Gas sensor; 18. Gas mixing chamber; 19. Nozzle array; 20. Flow regulating valve; 21. Stirring shaft; 22. Stirring blades; 23. Filter screen; 24. Conveyor belt; 25. Guide rail; 26. Support frame; 27. Roller; 28. Tray; 29. ​​Heat exchanger; 30. Heat exchange tube; 31. Spiral structure; 32. Air outlet; 33. Air inlet. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. When the number of elements is referred to as "multiple," it can be any number of two or more. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings:

[0030] Please see Figure 1 This utility model provides a batch sintering box for ceramic products, including a furnace body 1, a heating component, a gas circulation system, an atmosphere control module, a conveying mechanism, and a waste heat recovery device. The furnace body 1 is divided into a preheating zone 2, a high-temperature sintering zone 3, and a cooling zone 4. Each zone is separated by a partition 5. The partition 5 has an openable and closable passage door 6 in the middle. The passage door 6 is opened when the conveyor belt 24 is running to allow the support frame 26 to pass through.

[0031] Structure and connection relationship of heating components and gas circulation system

[0032] Please see Figure 2 The heating assembly is installed on the side wall of the high-temperature sintering zone 3, and includes several groups of parallel-arranged resistance heating tubes 7, with each group of resistance heating tubes 7 connected by a heat-conducting plate 8. The surface of the heat-conducting plate 8 has several uniformly distributed protrusions 9 to increase the heat radiation area, and the heat-conducting plate 8 and the resistance heating tubes 7 form an inclined surface 10 with an angle of 30°. The outer surface of the resistance heating tubes 7 is coated with an infrared reflective coating 11 with a thickness of 0.2 mm. The heat-conducting plate 8 is made of aluminum alloy with a thickness of 3 mm, and the contact surface between the heat-conducting plate 8 and the resistance heating tubes 7 is provided with a thermally conductive silicone grease layer 12 with a thickness of 0.1 mm.

[0033] The gas circulation system includes a main fan 13 located at the top of the high-temperature sintering zone 3 and an auxiliary fan 14 located at the bottom, connected by an annular duct 15. The annular duct 15 contains several guide vanes 16, which are arc-shaped and evenly distributed along the circumference of the duct. The radius of curvature of the guide vanes 16 is 1.5 times the diameter of the duct. The blades of both the main fan 13 and the auxiliary fan 14 are hyperbolic, with a radius of curvature 0.6 times the fan diameter. The main fan 13 rotates at 1500 r / min, and the auxiliary fan 14 rotates at 1200 r / min, with opposite rotation directions.

[0034] Structure and connection relationship of atmosphere control module

[0035] Please see Figure 3The atmosphere control module is located at the top of the high-temperature sintering zone 3, and includes a gas sensor 17, a gas mixing chamber 18, and a nozzle array 19. The gas mixing chamber 18 is connected to an external gas source via a pipe and contains a stirring shaft 21 with several stirring blades 22 mounted on it. The stirring blades 22 are tilted at a 45° angle. A filter screen 23 with a pore size of 0.5 mm is installed at the outlet of the gas mixing chamber 18. The nozzle array 19 is evenly arranged along the length of the high-temperature sintering zone 3, and each nozzle is equipped with an independent flow regulating valve 20. The gas sensor 17 monitors the atmosphere composition within the high-temperature sintering zone 3 in real time and achieves precise atmosphere control by regulating the flow regulating valves 20.

[0036] Structure and connection relationship of the conveying mechanism

[0037] Please see Figure 4 The conveying mechanism includes a conveyor belt 24 running through the furnace body 1. Guide rails 25 are provided on both sides of the conveyor belt 24, and several movable support frames 26 are mounted on the guide rails 25. There are 10 support frames 26, with a spacing of 20cm between adjacent support frames and a height of 30cm for each support frame 26. Rollers 27 with a diameter of 5cm are provided at the bottom of each support frame 26, and the coefficient of friction between the rollers 27 and the guide rails 25 is 0.05. A tray 28 is provided on the top of each support frame 26 to support ceramic products.

[0038] Structure and connection relationship of waste heat recovery device

[0039] Please see Figure 5 The waste heat recovery device includes a heat exchanger 29 located at the rear end of the cooling zone 4, with a spiral heat exchange tube 30 inside the heat exchanger 29. The two ends of the heat exchange tube 30 are connected to the air outlet 32 ​​of the cooling zone 4 and the air inlet 33 of the preheating zone 2, respectively. The outer shell of the heat exchanger 29 is rectangular, with a length, width, and height of 80cm, 60cm, and 50cm, respectively. The heat exchange tube 30 is made of stainless steel, with an outer diameter of 2cm, a wall thickness of 0.5mm, and a spiral pitch of 5cm.

[0040] Connection details between heat-conducting plate and resistance heating tube

[0041] Please see Figure 6 The heat-conducting plate 8 and the resistance heating tube 7 are tightly connected by a thermally conductive silicone grease layer 12, and an inclined surface 10 with an included angle of 30° is formed between the heat-conducting plate 8 and the resistance heating tube 7 to optimize the heat transfer path. The raised structure 9 on the surface of the heat-conducting plate 8 increases the heat radiation area, thereby significantly improving the heating efficiency and the uniformity of heat transfer.

[0042] Specific working principle and operation process

[0043] When ceramic products are placed on tray 28 and enter furnace 1 via conveyor belt 24, they first pass through preheating zone 2, where the temperature is maintained by heat provided by waste heat recovery device. Subsequently, support frame 26 enters high-temperature sintering zone 3 through passage door 6. The heating assembly consisting of resistance heating tube 7 and heat-conducting plate 8 begins operation, achieving efficient and uniform heating through the raised structure 9 and inclined surface 10 design on the heat-conducting plate 8. The stable vortex formed by main fan 13 and auxiliary fan 14, in conjunction with guide plate 16, improves the temperature uniformity within high-temperature sintering zone 3, reducing warping and oxidation defects in the ceramic products. Simultaneously, the atmosphere control module monitors the atmosphere composition in real time via gas sensor 17 and precisely controls it via nozzle array 19 to ensure a stable atmosphere during the sintering process.

[0044] After high-temperature sintering, the support frame 26 enters the cooling zone 4 through the passage door 6. The heat from the cooling zone 4 is recovered by the heat exchanger 29 and transferred to the preheating zone 2, achieving efficient energy utilization. The cooled ceramic products are finally output from the furnace body 1 via the conveyor belt 24.

[0045] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A batch sintering box for ceramic products, characterized in that: The furnace body (1) is divided into a preheating zone (2), a high-temperature sintering zone (3) and a cooling zone (4). Each zone is separated by a partition (5), and the partition (5) has an openable and closable passage door (6) in the middle. The sidewall of the high-temperature sintering zone (3) is equipped with a heating assembly, which includes several groups of parallel-arranged resistance heating tubes (7). Each group of resistance heating tubes (7) is connected by a heat-conducting sheet (8). Several protruding structures (9) are evenly distributed on the surface of the heat-conducting sheet (8). An inclined surface (10) with an angle of 30° is formed between the heat-conducting sheet (8) and the resistance heating tubes (7). The top and bottom of the high-temperature sintering zone (3) are respectively equipped with a main fan (13) and an auxiliary fan (14). The main fan (13) and the auxiliary fan (14) are connected by an annular air duct (15). Several arc-shaped guide plates (16) are provided in the annular air duct (15). The guide plates (16) are evenly distributed along the circumference of the air duct. An atmosphere control module is provided at the top of the high-temperature sintering zone (3). The atmosphere control module includes a gas sensor (17), a gas mixing chamber (18), and a nozzle array (19). The gas mixing chamber (18) is connected to an external gas source through a pipe. The nozzle array (19) is evenly arranged along the length of the high-temperature sintering zone (3). Each nozzle is equipped with a flow regulating valve (20). A conveyor belt (24) is installed through the furnace body (1). Guide rails (25) are installed on both sides of the conveyor belt (24). Several support frames (26) are installed on the guide rails (25). Rollers (27) are installed at the bottom of the support frames (26). A tray (28) is installed at the top of the support frames (26). A heat exchanger (29) is provided at the rear end of the cooling zone (4). A spiral heat exchange tube (30) is provided inside the heat exchanger (29). The two ends of the heat exchange tube (30) are connected to the air outlet (32) of the cooling zone (4) and the air inlet (33) of the preheating zone (2), respectively.

2. The batch sintering box for ceramic products according to claim 1, characterized in that: The outer surface of the resistance heating tube (7) is coated with an infrared reflective coating (11), and a thermally conductive silicone grease layer (12) is provided on the contact surface between the heat-conducting sheet (8) and the resistance heating tube (7).

3. A batch sintering box for ceramic products according to claim 1, characterized in that: The blades of the main fan (13) and the auxiliary fan (14) are both hyperbolic, and the main fan (13) and the auxiliary fan (14) rotate in opposite directions.

4. A batch sintering box for ceramic products according to claim 1, characterized in that: The gas mixing chamber (18) is equipped with a stirring shaft (21), and several stirring blades (22) are installed on the stirring shaft (21). A filter screen (23) is installed at the outlet of the gas mixing chamber (18).

5. A batch sintering box for ceramic products according to claim 1, characterized in that: The number of support frames (26) is 10, and the distance between adjacent support frames (26) is 20cm.

6. A batch sintering box for ceramic products according to claim 1, characterized in that: The outer shell of the heat exchanger (29) is rectangular.

7. A batch sintering box for ceramic products according to claim 1, characterized in that: The radius of curvature of the guide plate (16) is 1.5 times the diameter of the annular air duct (15).

8. A batch sintering box for ceramic products according to claim 1, characterized in that: The passage door (6) is located in the middle of the partition (5), and the position of the passage door (6) corresponds to the running path of the conveyor belt (24).

9. A batch sintering box for ceramic products according to claim 1, characterized in that: The tray (28) is fixedly connected to the top of the support frame (26), and the size of the tray (28) matches the top area of ​​the support frame (26).

10. A batch sintering box for ceramic products according to claim 1, characterized in that: The resistance heating tube (7) and the heat-conducting sheet (8) are tightly connected by a heat-conducting grease layer (12), and the protrusion structure (9) on the surface of the heat-conducting sheet (8) is regularly distributed.

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