Continuous microwave sintering system for ceramic roller

Abstract

The utility model discloses a ceramic roller continuous microwave sintering system, and relates to the technical field of ceramic roller production equipment. The continuous microwave sintering system comprises a microwave sintering kiln, a microwave source, a focusing regulator, a driving device and an auxiliary heating base. A sintering cavity is formed in the microwave sintering kiln, the auxiliary heating base is installed in the sintering cavity, a microwave energy feedback opening is formed in one side of the microwave sintering kiln, the focusing regulator is installed in the microwave sintering kiln, and the microwave source, the microwave energy feedback opening and the focusing regulator correspond to one another in installation position. The driving device is installed above the sintering cavity and used for driving the aluminum oxide ceramic roller to enter and pass through the sintering cavity while keeping rotating motion. According to the continuous microwave sintering system, the heating area, the sintering area and the cooling area which meet the sintering parameters of the aluminum oxide ceramic roller can be formed in the cavity, dynamic continuous sintering can be achieved, and then microwave sintering on the aluminum oxide ceramic roller is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of ceramic roller production equipment, and in particular to a continuous microwave sintering system for ceramic rollers. Background Technology

[0002] Ceramic rollers are a special type of refractory kiln furniture, used in roller kilns and drying kilns to support and transport ceramic bricks and other products. Currently, ceramic roller sintering mainly employs pit kiln hoisting sintering. Pit kiln hoisting sintering relies on a heating element to transfer heat to the ceramic rollers through convection, conduction, or radiation to reach the sintering temperature. Because heat is transferred from the outside to the inside in pit kiln hoisting sintering, a temperature gradient exists within the ceramic rollers. Furthermore, influenced by the high-temperature airflow, temperature gradients also exist between the horizontal and vertical planes within the kiln. During sintering, temperature differences also exist between different locations within the ceramic rollers and between different parts of the ceramic rollers, leading to uneven heating. Therefore, ceramic rollers sintered using traditional pit kiln hoisting methods are prone to defects such as inconsistent shrinkage and uneven grain structure, affecting their strength and thermal shock resistance. Simultaneously, the dimensional uniformity, performance uniformity, and yield of the ceramic rollers are also impacted.

[0003] Microwave sintering is a novel method for ceramic sintering. It involves the direct interaction of microwaves with material particles (molecules, ions), utilizing the dielectric loss of the material to allow the sample to directly absorb microwave energy, thus heating and sintering the ceramic. Microwave sintering offers advantages such as rapid heating, high energy efficiency, high heating efficiency, and precise control of the heating process. Microwave heating enables uniform heating from the inside out, improving product uniformity and yield, and enhancing the microstructure and properties of the sintered product. It has become a new research hotspot in the field of ceramic roller sintering.

[0004] Currently, common microwave sintering equipment mainly consists of three parts: a microwave source, a microwave resonant cavity, and a heat preservation device. During microwave sintering, the product to be sintered is first placed in the heat preservation device, and then the heat preservation device and the product are placed together in the microwave resonant cavity. The microwave source is then turned on, and the input frequency is adjusted to achieve microwave sintering. Currently, the ceramic rollers used in roller kilns of ceramic production enterprises are generally alumina ceramic rollers. Alumina ceramic rollers have a high sintering temperature, exceeding 1200℃. However, the weak electric field strength in traditional microwave multimode resonant cavities and the low dielectric loss of alumina ceramic rollers make it difficult to reach microwave sintering temperatures above 1200℃, thus hindering microwave sintering of alumina ceramic rollers. Furthermore, due to the long size of alumina ceramic rollers, and the fixed position of the rollers in existing microwave sintering equipment, non-uniform heating is easily observed during sintering, leading to localized overheating and scorching problems, which in turn affect the sintering effect of the ceramic rollers. Therefore, there is an urgent need to develop a microwave continuous sintering equipment suitable for microwave sintering of alumina ceramic rollers, which is of great significance for realizing the industrial production of microwave sintering of alumina ceramic rollers. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to propose a continuous microwave sintering system for ceramic rollers. The continuous microwave sintering system of this utility model can form a heating zone, a sintering zone and a cooling zone in the cavity that meet the sintering parameters of alumina ceramic rollers, and can realize dynamic continuous sintering. It solves the problem that existing microwave sintering devices are difficult to realize microwave sintering of alumina ceramic rollers and solves the problem of uneven heating that occurs when using existing microwave sintering devices to microwave sinter ceramic rollers.

[0006] To solve the above-mentioned technical problems, this utility model provides a continuous microwave sintering system for ceramic rollers, including a microwave sintering kiln, a microwave source, a focusing regulator, a driving device, and an auxiliary heating base;

[0007] The microwave sintering kiln has a sintering cavity inside, which is used to sinter alumina ceramic rollers. The auxiliary heating base is installed inside the sintering cavity. After absorbing microwaves, the auxiliary heating base is used to heat the alumina ceramic rollers so that the temperature of the alumina ceramic rollers reaches the critical temperature of microwave sintering.

[0008] A microwave feed port is provided on one side of the microwave sintering kiln. The microwave source is located outside the microwave sintering kiln and is positioned on the side of the microwave sintering kiln closest to the microwave feed port. The focusing regulator is installed inside the microwave sintering kiln and is positioned on the side of the sintering cavity away from the microwave feed port. The installation positions of the microwave source, the microwave feed port, and the focusing regulator are corresponding, and the connecting line between the microwave feed port and the focusing regulator is perpendicular to the vertical centerline of the sintering cavity.

[0009] The driving device is installed above the sintering chamber, and the driving device is used to drive the alumina ceramic roller to enter and pass through the sintering chamber while maintaining rotational motion.

[0010] Preferably, the focusing regulator is movably installed inside the microwave sintering kiln, and the focusing regulator has an adjustment angle of 0 to 90 degrees;

[0011] The reflective surface of the focusing modulator faces the microwave feed port, and the reflective surface of the focusing modulator is a concave elliptic surface.

[0012] Preferably, the microwave sintering kiln is further provided with a heat preservation cavity, which is located outside the sintering cavity and is filled with heat preservation material.

[0013] Preferably, the continuous microwave sintering system for ceramic rollers further includes a temperature detection device, which is inserted horizontally into the wall of the microwave sintering kiln, with one end of the temperature detection device extending into the interior of the microwave sintering kiln. The temperature detection device is used to monitor the temperature inside the microwave sintering kiln.

[0014] Preferably, the driving device includes a clamping mechanism, a rotating mechanism, a rotating driving mechanism, a feeding mechanism, and a feeding driving mechanism;

[0015] The feeding drive mechanism and the feeding mechanism are connected by a transmission connection. The feeding drive mechanism is used to drive the feeding mechanism to reciprocate along the vertical direction of the sintering cavity. The feeding mechanism and the rotary drive mechanism are connected by a transmission connection. The rotary drive mechanism is used to drive the rotary mechanism to rotate in the horizontal plane. The rotary mechanism and the clamping mechanism are fixedly connected. The clamping mechanism is used to clamp the alumina ceramic roller.

[0016] Preferably, the clamping mechanism includes a fastener, a clamping cylinder, and a connecting plate. One side of the connecting plate is connected to the clamping cylinder, and the other side of the connecting plate is connected to the rotating mechanism. The inner cavity size of the clamping cylinder matches the size of the alumina ceramic roller. The clamping cylinder is used to clamp the alumina ceramic roller. The fastener is threadedly connected to the clamping cylinder and is used to fix the position of the alumina ceramic roller.

[0017] The feeding mechanism includes a feeding push rod and a connecting part. One side of the feeding push rod is connected to the telescopic end of the feeding drive mechanism, and the other side of the feeding push rod is connected to the connecting part. The connecting part is connected to the fixed end of the rotary drive mechanism, and the rotating end of the rotary drive mechanism is connected to the rotary mechanism.

[0018] Preferably, the continuous microwave sintering system for ceramic rollers further includes a circulator, which is installed between the microwave source and the microwave feed port.

[0019] Preferably, the continuous microwave sintering system for ceramic rollers further includes a central controller, a mixer, and a directional coupler;

[0020] The output terminal of the temperature detection device is connected to the first input terminal of the mixer;

[0021] The microwave sintering kiln is signal-connected to the directional coupler, the directional coupler is signal-connected to the tuner, and the tuner is signal-connected to the central controller.

[0022] The microwave source, the rotary drive mechanism, and the feeding drive mechanism are all connected to the central controller via signal transmission.

[0023] Preferably, the continuous microwave sintering system for ceramic rollers further includes a transmitter, and the directional coupler and the central controller are signal-connected to the tuner through different transmitters.

[0024] Preferably, when the alumina ceramic roller is microwave sintered, the distance between the auxiliary heating base and the outer wall of the alumina ceramic roller is 10-30 mm.

[0025] The present invention provides the following advantages: The continuous microwave sintering system for ceramic rollers utilizes an auxiliary heating base with strong microwave coupling capability at room temperature, placed within the sintering cavity to assist in heating the alumina ceramic rollers. This indirectly heats the alumina ceramic rollers to reach their critical microwave sintering temperature, overcoming the difficulty of effectively microwave sintering alumina ceramic rollers due to insufficient dielectric loss and weak microwave coupling capability at room temperature. Furthermore, the present invention places a focusing regulator at the center opposite the microwave feed port, forming a mixed field within the cavity composed of a standing wave field and a focusing field. This creates heating, sintering, and cooling zones within the cavity that satisfy the sintering parameters for the alumina ceramic rollers. The intensity of the mixed field in the sintering zone within the cavity enables the alumina ceramic rollers to reach temperatures above 1200℃ during microwave sintering. In addition, the continuous microwave sintering system for ceramic rollers in this technical solution is also equipped with a driving device. The driving device can drive the alumina ceramic rollers to enter and pass through the sintering cavity while maintaining rotational motion, thereby realizing dynamic continuous sintering. This improves the uneven heating of ceramic rollers caused by the change in dielectric loss of ceramic rollers with temperature when using traditional microwave sintering equipment. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a continuous microwave sintering system for ceramic rollers in one embodiment of this utility model;

[0027] Figure 2 yes Figure 1 The diagram shows the structure of the microwave sintering kiln in the continuous microwave sintering system for ceramic rollers.

[0028] Figure 3 yes Figure 1 The diagram shows the structure of the drive device in the continuous microwave sintering system for ceramic rollers.

[0029] Figure 4 yes Figure 3 An exploded schematic diagram of the drive device shown.

[0030] Figure 5 yes Figure 1 The diagram shows a geometrical schematic of the mixing field pattern in a continuous microwave sintering system for ceramic rollers.

[0031] In the diagram: 1. Microwave sintering kiln; 2. Microwave source; 3. Circulator; 4. Directional coupler; 5. Clamping mechanism; 6. Rotation mechanism; 7. Rotation drive mechanism; 8. Feeding mechanism; 9. Insulation material; 10. Temperature detection device; 20. Focusing regulator; 50. Alumina ceramic roller; 80. Auxiliary heating base; 11. Sintering chamber; 101. Insulation chamber; 102. Microwave power supply port; 103. Fastener; 51. Clamping cylinder; 52. Connecting plate; 53. Coupling; 81. Adjuster; 60. Central controller; 70. Transmitter; 90. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0033] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0035] like Figures 1 to 4 As shown, a continuous microwave sintering system for ceramic rollers includes a microwave sintering kiln 1, a microwave source 2, a focusing regulator 50, a driving device, and an auxiliary heating base 11.

[0036] The microwave sintering kiln 1 has a sintering chamber 101 inside, so the sintering chamber 101 is used to sinter alumina ceramic rollers 80. The auxiliary heating base 11 is installed inside the sintering chamber 101. After absorbing microwaves, the auxiliary heating base 11 is used to heat the alumina ceramic rollers 80, so that the temperature of the alumina ceramic rollers 80 reaches the critical temperature of microwave sintering.

[0037] A microwave feed port 103 is provided on one side of the microwave sintering kiln 1. The microwave source 2 is located outside the microwave sintering kiln 1 and is positioned on the side of the microwave sintering kiln 1 closest to the microwave feed port 103. The focusing regulator 50 is installed inside the microwave sintering kiln 1 and is positioned on the side of the sintering cavity 101 away from the microwave feed port 103. The installation positions of the microwave source 2, the microwave feed port 103, and the focusing regulator 50 are corresponding (i.e., the installation positions of the three are on the same horizontal line).

[0038] The driving device is installed above the sintering chamber 101, and the driving device is used to drive the alumina ceramic roller 80 to enter and pass through the sintering chamber 101 while maintaining rotational motion.

[0039] It is worth noting that the continuous microwave sintering system for ceramic rollers in this technical solution uses an auxiliary heating base 11 with strong microwave coupling capability at room temperature placed in the sintering cavity 101 to assist in heating the alumina ceramic rollers. This allows the alumina ceramic rollers to be indirectly heated to reach their critical microwave sintering temperature, overcoming the difficulty that alumina ceramic rollers cannot be effectively microwave sintered due to their low dielectric loss and weak microwave coupling capability at room temperature. Furthermore, this technical solution places a focusing regulator at the center of the opposite side of the microwave feed port 103, forming a mixed field in the cavity composed of the superposition of the standing wave field and the focusing field. This creates heating, sintering, and cooling zones within the cavity that satisfy the sintering parameters of the alumina ceramic rollers. Moreover, the intensity of the mixed field in the sintering zone within the cavity enables the alumina ceramic rollers to reach temperatures above 1200℃ during microwave sintering. In addition, the continuous microwave sintering system for ceramic rollers in this technical solution is also equipped with a driving device. The driving device can drive the alumina ceramic rollers 80 to enter and pass through the sintering chamber 101 while maintaining rotational motion, thereby realizing dynamic continuous sintering. This improves the phenomenon of uneven heating of ceramic rollers caused by the change in dielectric loss of ceramic rollers with temperature when using traditional microwave sintering equipment.

[0040] Specifically, in this technical solution, a microwave power supply port 103 is provided in the middle of one side of the wall of the microwave sintering kiln 1. The focusing regulator 50 is installed inside the microwave sintering kiln 1 and is located on the side of the sintering cavity 101 away from the microwave power supply port 103. That is, the microwave power supply port 103 and the focusing regulator 50 are located on both sides of the sintering cavity 101, and they are directly opposite each other. By installing a focusing regulator 50 inside the microwave sintering furnace 1, the field pattern inside the cavity is made into a mixed field formed by the superposition of the standing wave field and the microwave focusing field. The focusing field in this mixed field is not a perturbation field but a field with an intensity comparable to that of the standing wave component. This increases the electric field intensity inside the microwave sintering furnace 1 and makes the electric field intensity inside the microwave sintering furnace 1 decrease from the middle to the upper and lower sides respectively. The area with stronger electric field intensity corresponds to a higher temperature, and the area with weaker electric field intensity corresponds to a lower temperature. Thus, a heating zone, a sintering zone and a cooling zone are formed from top to bottom inside the sintering cavity 101. The electric field intensity in the sintering zone can enable the sintering temperature of the alumina ceramic roller 80 to reach above 1200℃.

[0041] It should be noted that in this technical solution, an auxiliary heating base 11 is placed inside the sintering cavity 101. The auxiliary heating base 11 is made of a material that can absorb microwaves at room temperature. After absorbing microwaves, the auxiliary heating base 11 is used to assist in heating the alumina ceramic roller 80, so that the alumina ceramic roller 80 is indirectly heated to reach its critical temperature for microwave sintering. This overcomes the difficulty that the alumina ceramic roller cannot be effectively microwave sintered because the dielectric loss is too small and the microwave coupling ability is weak at room temperature.

[0042] Specifically, the auxiliary heating base 11 in this technical solution is made of a material with strong microwave coupling capability at room temperature, enabling the auxiliary heating base 11 to absorb microwaves and dissipate heat at room temperature, thereby heating the alumina ceramic roller 80 and raising the temperature of the alumina ceramic roller 80 to the critical temperature for microwave sintering. The exemplary material of the auxiliary heating base 11 is silicon carbide or graphite, but it is not limited to these.

[0043] Specifically, the top and bottom of the sintering chamber 101 are respectively provided with an inlet and an outlet for the alumina ceramic roller 80 to enter and exit.

[0044] Preferably, the connection line between the microwave feed port 103 and the focusing regulator 50 is perpendicular to the vertical centerline of the sintering cavity 101, so that the focusing regulator 50 can better adjust the electric field strength inside the sintering cavity 101, thereby adjusting the distribution of the heating zone, sintering zone and cooling zone.

[0045] Further explanation: the focusing regulator 50 is movably installed inside the microwave sintering furnace 1, and the adjustment angle of the focusing regulator 50 is 0 to 90 degrees; in this technical solution, the direction of the focusing regulator 50 can be movably adjusted from 0 to 90 degrees. By adjusting the orientation angle of the focusing regulator in the microwave multimode resonant cavity, the intensity and distribution of the mixing field in the cavity are changed, thereby adjusting the distribution and length of the heating zone, sintering zone and cooling zone;

[0046] The focusing regulator 50 of this technical solution has an overall arc-shaped structure, and the reflective surface of the focusing regulator faces the microwave feed port. The reflective surface of the focusing regulator is a concave elliptic surface, so that a mixed field composed of the superposition of the standing wave field and the focusing field is formed in the cavity. Furthermore, the intensity of the mixed field in the sintering zone of the cavity can enable the temperature of the ceramic roller to reach above 1200℃ during microwave sintering.

[0047] Specifically, the focusing regulator used in this technical solution is available for purchase on the market.

[0048] Further explanation: the microwave sintering kiln 1 is also provided with a heat preservation cavity 102, which is located outside the sintering cavity 101, and the heat preservation cavity 102 is filled with heat preservation material 10.

[0049] Preferably, the microwave sintering furnace 1 has a cylindrical multi-mode cavity structure. The center of the microwave sintering furnace 1 is the sintering cavity 101, and the outside of the sintering cavity 101 is the insulation cavity 102. The insulation cavity 102 can be non-uniformly filled with insulation material 10, which can reduce heat loss during the sintering process, ensure the temperature stability within the microwave multi-mode resonant cavity, and facilitate microwave sintering.

[0050] Preferably, the thermal insulation material 10 is a porous alumina fiber and / or a polycrystalline mullite fiber material.

[0051] Further explanation: the continuous microwave sintering system for ceramic rollers also includes a temperature detection device 20, which is inserted horizontally into the wall of the microwave sintering kiln 1, with one end of the temperature detection device 20 extending into the interior of the microwave sintering kiln 1. The temperature detection device 20 is used to monitor the temperature inside the microwave sintering kiln 1.

[0052] Preferably, the temperature detection device 20 is an infrared radiation thermometer, which is an instrument that uses the infrared radiation of an object to measure temperature. It can complete the temperature measurement in a short time and does not need to be in direct contact with the ceramic roller. It can measure the temperature of the ceramic roller from a certain distance without causing interference or damage to the ceramic roller.

[0053] Preferably, there are three temperature detection devices 20, which are respectively located in the upper, middle and lower parts of the microwave sintering kiln 1, and are used to monitor the temperature of the heating zone, the sintering zone and the cooling zone inside the microwave sintering kiln 1.

[0054] Further explanation: the driving device includes a clamping mechanism 5, a rotating mechanism 6, a rotating driving mechanism 7, a feeding mechanism 8, and a feeding driving mechanism 9;

[0055] The feeding drive mechanism 9 and the feeding mechanism 8 are connected by a transmission. The feeding drive mechanism 9 is used to drive the feeding mechanism 8 to reciprocate along the vertical direction of the sintering chamber 101. The feeding mechanism 8 is connected to the rotary drive mechanism 7, and the rotary drive mechanism 7 is connected to the rotary mechanism 6 by a transmission. The rotary drive mechanism 7 is used to drive the rotary mechanism 6 to rotate in the horizontal plane. The rotary mechanism 6 is fixedly connected to the clamping mechanism 5, and the clamping mechanism 5 is used to clamp the alumina ceramic roller 80.

[0056] The coupling of the rotary drive mechanism 7 and the feeding drive mechanism 9 in this technology enables the alumina ceramic roller 80 to simultaneously perform rotary and linear motion relative to the sintering chamber 101.

[0057] The feeding drive mechanism 9 in this technical solution is a power source that enables the feeding mechanism 8 to reciprocate along the vertical direction of the sintering chamber 101. For example, the feeding drive mechanism 9 can be a drive cylinder, and the extension end of the drive cylinder is connected to the feeding mechanism 8. The drive cylinder enables the feeding mechanism 8 to reciprocate along the vertical direction of the sintering chamber 101.

[0058] The rotary drive mechanism 7 in this technical solution is a power source that enables the rotary mechanism 6 to rotate in a horizontal plane. Preferably, the rotary drive mechanism 7 is a motor, the fixed end of which is fixedly connected to the feeding mechanism 8 via a mounting base, and the rotating end of which is connected to the rotary mechanism 6 via a coupling 81.

[0059] Further explanation: The clamping mechanism 5 includes a fastener 51, a clamping cylinder 52, and a connecting plate 53. One side of the connecting plate 53 is connected to the clamping cylinder 52, and the other side of the connecting plate 53 is connected to the rotating mechanism 6 by bolts. The inner cavity size of the clamping cylinder 52 matches the size of the alumina ceramic roller 80. The clamping cylinder 52 is used to clamp the alumina ceramic roller 80. The fastener 51 is threadedly connected to the clamping cylinder 52. The fastener 51 is used to fix the position of the alumina ceramic roller 80.

[0060] The feeding mechanism 8 includes a feeding push rod and a connecting part (not shown in the figure). One side of the feeding push rod is connected to the telescopic end of the feeding drive mechanism 9, and the other side of the feeding push rod is connected to the connecting part. The connecting part is connected to the fixed end of the rotary drive mechanism 7, and the rotating end of the rotary drive mechanism 7 is connected to the rotary mechanism 6 in a transmission connection.

[0061] Further explanation: the continuous microwave sintering system for ceramic rollers also includes a circulator 3, which is installed between the microwave source 2 and the microwave feed port 103.

[0062] It is worth noting that this technical solution provides a circulator 3 between the microwave source 2 and the microwave feed port 103. The circulator 3 can protect the microwave source 2, so that the reflected power of the system is absorbed by the water load and does not return to the microwave source 2, thereby protecting the microwave source 2 from damage by high-power reflected waves.

[0063] Preferably, the microwave source 2, the circulator 3, and the microwave feed port 103 are located on the same horizontal line, which can play a better role in protecting the microwave source 2.

[0064] Specifically, the circulator 3 used in this technical solution can be purchased from the market.

[0065] Further explanation: the continuous microwave sintering system for ceramic rollers also includes a central controller 70, a tuner 60, and a directional coupler 4;

[0066] The output terminal of the temperature detection device 20 is connected to the first input terminal of the regulator 60;

[0067] The microwave sintering kiln 1 is signal-connected to the directional coupler 4, the directional coupler 4 is signal-connected to the tuner 60, and the tuner 60 is signal-connected to the central controller 70.

[0068] The microwave source 2, the rotary drive mechanism 7, and the feeding drive mechanism 9 are all connected to the central controller 70 via signal.

[0069] It is worth noting that in this technical solution, the central controller 70 controls the rotary drive mechanism 7 and the feeding drive mechanism 9 based on the sintering curve of the alumina ceramic roller 80, thereby controlling the speed at which the alumina ceramic roller 80 passes through the heating zone, sintering zone, and cooling zone. Throughout the sintering process, the central controller 70 and the directional coupler 4 are connected to the regulator 60 for signal interaction and functional control, achieving feedback regulation. Based on the temperature feedback from the temperature detection device 20, the central controller 70 fine-tunes the power of the microwave source 2 to keep the internal temperature of the microwave sintering kiln 1 within a reasonable range, ensuring that the sintered alumina ceramic roller has a uniform microstructure and a dense structure.

[0070] Further explanation: the continuous microwave sintering system for ceramic rollers also includes a transmitter 90, and the directional coupler 4 and the central controller 70 are signal-connected to the tuner 60 through different transmitters 90.

[0071] Specifically, in this technical solution, the distributor 60 is connected to the central controller 70 and the directional coupler 4 through different transmitters 90 to perform signal interaction and function control with each other.

[0072] To further explain, when the alumina ceramic roller 80 is microwave sintered, the distance between the auxiliary heating base 11 and the outer wall of the alumina ceramic roller 80 is 10-30 mm.

[0073] This technical solution controls the distance between the auxiliary heating base 11 and the outer wall of the alumina ceramic roller 80 to be 10-30mm, which enables the alumina ceramic roller 80 to be heated more quickly, so that its temperature reaches the critical temperature of microwave sintering (200-450℃).

[0074] Specifically, in this technical solution, the sintering cavity 101 can be a cylindrical cavity or a cuboid cavity, and the shape of the insulation cavity 102 is adapted to the sintering cavity 101. Furthermore, when the insulation effect of the microwave sintering kiln wall is good, two insulation cavities 102 can be provided inside the microwave sintering kiln, with the gap between the two insulation cavities forming the sintering cavity 101. The auxiliary heating base 11 in this technical solution can be cylindrical or hollow cuboid. During microwave sintering of the alumina ceramic roller 80, the alumina ceramic roller 80 passes through the interior of the auxiliary heating base 11, thereby heating the alumina ceramic roller 80. Alternatively, two independent auxiliary heating bases 11, respectively located on both sides of the sintering cavity 101, can also achieve the effect of heating the alumina ceramic roller 80.

[0075] It is worth noting that the method of using the continuous microwave sintering system for ceramic rollers in this technical solution is as follows: First, the alumina ceramic roller 80 is placed in the clamping cylinder 52 and fixed with fasteners 51. The power of the microwave source 2 is adjusted according to the process sintering temperature of the alumina ceramic roller 80. The auxiliary heating base 11 with strong microwave coupling capability is heated and releases heat energy, allowing the alumina ceramic roller 80 to reach its critical microwave sintering temperature. The temperature detection device 20 monitors the temperature of the heating zone, sintering zone, and cooling zone inside the microwave sintering kiln 1 and feeds the temperature back to the regulator 60. When the temperature inside the microwave sintering kiln 1 reaches the process sintering temperature of the alumina ceramic roller 80, the rotary drive mechanism 7 and the feeding drive mechanism 9 couple together, causing the alumina ceramic roller 80 to simultaneously rotate and move linearly relative to the sintering chamber 101. The alumina ceramic roller 80 continuously passes through the heating zone, sintering zone, and cooling zone in the vertical direction within the sintering chamber 101, thereby achieving continuous sintering. Furthermore, the central controller 70 controls the rotary drive mechanism 7 and the feeding drive mechanism 9 based on the sintering curve of the alumina ceramic roller 80, thereby controlling the speed at which the alumina ceramic roller 80 passes through the heating zone, sintering zone, and cooling zone. Throughout the sintering process, the distributor 60 connects to the central controller 70 and the directional coupler 4 via the transmitter 90 for signal interaction and functional control, achieving feedback regulation. Based on the temperature feedback from the temperature detection device 20, the central controller 70 fine-tunes the power of the microwave source 2 to ensure that the internal temperature of the microwave sintering kiln 1 fluctuates within a reasonable range, ensuring that the sintered alumina ceramic roller has a uniform microstructure and a dense structure.

[0076] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A continuous microwave sintering system for ceramic rollers, characterized in that, It includes a microwave sintering kiln, a microwave source, a focusing regulator, a drive unit, and an auxiliary heating base; The microwave sintering kiln has a sintering cavity inside, which is used to sinter alumina ceramic rollers. The auxiliary heating base is installed inside the sintering cavity. After absorbing microwaves, the auxiliary heating base is used to heat the alumina ceramic rollers so that the temperature of the alumina ceramic rollers reaches the critical temperature of microwave sintering. A microwave feed port is provided on one side of the microwave sintering kiln. The microwave source is located outside the microwave sintering kiln and is positioned on the side of the microwave sintering kiln closest to the microwave feed port. The focusing regulator is installed inside the microwave sintering kiln and is positioned on the side of the sintering cavity furthest from the microwave feed port. The installation positions of the microwave source, the microwave feed port, and the focusing regulator are corresponding. The driving device is used to drive the alumina ceramic roller to enter and pass through the sintering chamber while maintaining rotational motion.

2. The continuous microwave sintering system for ceramic rollers according to claim 1, characterized in that, The focusing regulator is movably installed inside the microwave sintering kiln, and the focusing regulator has an adjustment angle of 0 to 90 degrees. The reflective surface of the focusing modulator faces the microwave feed port, and the reflective surface of the focusing modulator is a concave elliptic surface.

3. The continuous microwave sintering system for ceramic rollers according to claim 1, characterized in that, The microwave sintering kiln is also equipped with a heat preservation cavity, which is located outside the sintering cavity and is filled with heat preservation material.

4. The continuous microwave sintering system for ceramic rollers according to claim 1, characterized in that, The continuous microwave sintering system for ceramic rollers also includes a temperature detection device, which is inserted horizontally into the wall of the microwave sintering kiln, with one end of the temperature detection device extending into the interior of the microwave sintering kiln. The temperature detection device is used to monitor the temperature inside the microwave sintering kiln.

5. The continuous microwave sintering system for ceramic rollers according to claim 4, characterized in that, The driving device is installed above the sintering chamber, and the driving device includes a clamping mechanism, a rotating mechanism, a rotating driving mechanism, a feeding mechanism, and a feeding driving mechanism. The feeding drive mechanism and the feeding mechanism are connected by a transmission connection. The feeding drive mechanism is used to drive the feeding mechanism to reciprocate along the vertical direction of the sintering cavity. The feeding mechanism and the rotary drive mechanism are connected by a transmission connection. The rotary drive mechanism is used to drive the rotary mechanism to rotate in the horizontal plane. The rotary mechanism and the clamping mechanism are fixedly connected. The clamping mechanism is used to clamp the alumina ceramic roller.

6. The continuous microwave sintering system for ceramic rollers according to claim 5, characterized in that, The clamping mechanism includes a fastener, a clamping cylinder, and a connecting plate. One side of the connecting plate is connected to the clamping cylinder, and the other side of the connecting plate is connected to the rotating mechanism. The inner cavity size of the clamping cylinder is adapted to the size of the alumina ceramic roller. The clamping cylinder is used to clamp the alumina ceramic roller. The fastener is threadedly connected to the clamping cylinder and is used to fix the position of the alumina ceramic roller. The feeding mechanism includes a feeding push rod and a connecting part. One side of the feeding push rod is connected to the telescopic end of the feeding drive mechanism, and the other side of the feeding push rod is connected to the connecting part. The connecting part is connected to the fixed end of the rotary drive mechanism, and the rotating end of the rotary drive mechanism is connected to the rotary mechanism.

7. The continuous microwave sintering system for ceramic rollers according to claim 1, characterized in that, The continuous microwave sintering system for ceramic rollers also includes a circulator, which is installed between the microwave source and the microwave feed port.

8. The continuous microwave sintering system for ceramic rollers according to claim 5, characterized in that, The continuous microwave sintering system for ceramic rollers also includes a central controller, a tuner, and a directional coupler. The output terminal of the temperature detection device is connected to the first input terminal of the mixer; The microwave sintering kiln is signal-connected to the directional coupler, the directional coupler is signal-connected to the tuner, and the tuner is signal-connected to the central controller. The microwave source, the rotary drive mechanism, and the feeding drive mechanism are all connected to the central controller via signal transmission.

9. The continuous microwave sintering system for ceramic rollers according to claim 8, characterized in that, The continuous microwave sintering system for ceramic rollers also includes a transmitter, and the directional coupler and the central controller are signal-connected to the tuner through different transmitters.

10. The continuous microwave sintering system for ceramic rollers according to claim 1, characterized in that, When the alumina ceramic roller is microwave sintered, the distance between the auxiliary heating base and the outer wall of the alumina ceramic roller is 10-30 mm.

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