Multi-section temperature control calcining device for zirconium oxide

Abstract

The utility model relates to the technical field of calcination of zirconia ceramic structural parts, in particular to a multi-section temperature control calcination device for zirconia. A heating mechanism is arranged in a main body, a feeding mechanism is installed at a feeding port of the heating mechanism, a cooling mechanism is installed at a discharging port of the heating mechanism, the heating mechanism comprises a preheating cavity and a calcination cavity, and the calcination cavity is rotatably installed in the main body; heating resistors are uniformly mounted outside the calcining cavity, temperature sensors are uniformly mounted in the calcining cavity, the main body is controlled by a PLC (Programmable Logic Controller), and the PLC is mounted in an operation table; the feeding mechanism comprises a stock bin and a feeding mechanism, a first electromagnetic valve is installed at a discharging port in the bottom of the stock bin, the feeding mechanism comprises a conveying belt at the bottom of the stock bin and a feeding plate at a feeding port of the heating mechanism, isolation plates are distributed on the surface of the conveying belt at intervals, and the feeding plate is driven by an air cylinder on the body. According to the device, the problems of sintering agglomeration, cracks and the like of zirconium oxide in a traditional method are solved, the performance of the product is improved, and the application requirement for higher performance is met.

Description

Technical Field

[0001] This application relates to the field of calcination technology for zirconia ceramic structural components, and in particular to a multi-stage temperature-controlled calcination device for zirconia. Background Technology

[0002] Conventional calcination methods for zirconia microspheres typically optimize their physical and chemical properties, improving their mechanical properties, stability, and high-temperature resistance. The calcination process has a crucial impact on the quality and performance of the zirconia microspheres. In conventional calcination, temperature control is paramount. Excessively high calcination temperatures and rapid heating rates can lead to over-sintering of particles in a short time, resulting in agglomeration. Furthermore, uneven cooling after calcination significantly affects the mechanical properties, particle size distribution, and density of zirconia. Therefore, a calcination device with multi-stage temperature control is needed. Utility Model Content

[0003] In order to overcome the problems existing in the prior art, this application provides a multi-stage temperature-controlled calcination device for zirconium oxide.

[0004] The multi-stage temperature-controlled calcination device for zirconium oxide provided in this application adopts the following technical solution:

[0005] A multi-stage temperature-controlled calcination apparatus for zirconium oxide, comprising:

[0006] The main body contains a heating mechanism. The heating mechanism has a feeding inlet and a cooling outlet. The heating mechanism includes a preheating chamber and a calcining chamber, with the calcining chamber rotatably mounted inside the main body. Heating resistors are evenly installed outside the calcining chamber, and temperature sensors are evenly installed inside. The main body is controlled by a PLC controller, which is installed on the operating table. The feeding mechanism includes a hopper and a feeding mechanism. A first solenoid valve is installed at the outlet of the hopper. The feeding mechanism includes a conveyor belt at the bottom of the hopper and a feeding plate at the heating mechanism's inlet. Isolation plates are spaced along the surface of the conveyor belt. The feeding plate is driven by a cylinder on the main body. The preheating chamber has an inlet and outlet connected to the heating mechanism's inlet and the calcining chamber's inlet, respectively.

[0007] By adopting the above technical solution, the main body supplies the zirconia microspheres to be calcined to the heating mechanism through the feeding mechanism. The first solenoid valve at the outlet of the hopper controls the uniform discharge of the hopper. A fixed amount of material is uniformly transferred between the partition plates on the conveyor belt. After being conveyed to the feeding plate by the conveyor belt, the material is introduced into the heating mechanism by the cylinder driving the feeding plate. The material entering the heating mechanism is preheated in the preheating chamber and then introduced into the calcination chamber. The heating resistor and temperature sensor in the calcination chamber are controlled by the PLC controller on the operating table. A curve-type heating method is adopted. The heating rate, holding time and temperature range in the calcination chamber are set by segmented temperature control. After the material is calcined in the calcination chamber, it is discharged into the cooling mechanism for cooling and then discharged.

[0008] Preferably, the preheating chamber adopts a cylindrical drum structure, and a stirring mechanism is spirally distributed inside the preheating chamber. The stirring mechanism includes several conveying plates arranged in a circumferential array that can clockwise transfer the material introduced into the preheating chamber inlet to the preheating chamber outlet.

[0009] Preferably, limit plates are installed at the free ends of both the conveyor plate and the feed plate, wherein the gap between the outer side of the limit plate of the conveyor plate and the inner wall of the preheating chamber is smaller than the particle size of the material.

[0010] By adopting the above technical solution, the introduced material enters the preheating chamber drum. The rotation of the stirring mechanism drives the material to flow clockwise from the inlet of the preheating chamber to the outlet of the preheating chamber. The stirring mechanism drives the circular array of conveying plates to rotate through the motor. The limiting plates installed at the free end of the conveying plates can jointly carry the material and transfer it in the preheating chamber.

[0011] Preferably, one end of the calcination chamber is connected to the output end of the motor, and the other end is provided with an opening. A sealing plate is detachably installed on the opening, and an exhaust valve is provided on the sealing plate. A discharge port corresponding to the feed port of the cooling mechanism is provided at the center of the bottom of the calcination chamber, and a second solenoid valve is installed on the discharge port.

[0012] Preferably, the top of the feeding mechanism has an exhaust port, and a filter is installed on the exhaust port.

[0013] By adopting the above technical solution, the calcining chamber is driven to rotate by a motor at one end. The material introduced into the calcining chamber is continuously turned during heating and calcination, ensuring uniform heating and calcination. A detachable sealing plate at the opening at the other end of the calcining chamber can be removed and installed from the top, facilitating sealing. An exhaust valve at the center of the sealing plate allows for pressure relief during calcination, and the high-temperature gas discharged from the calcining chamber can enter the preheating chamber, providing heat for preheating. A second solenoid valve installed at the bottom outlet of the calcining chamber opens for material discharge after calcination is complete.

[0014] Preferably, the cooling mechanism is equipped with a support mesh for storing the calcined material, and the upper and lower parts of the support mesh are respectively connected to an air outlet pipe and an air inlet pipe, and a lifting mechanism for turning over the material is installed at the bottom of the support mesh.

[0015] Preferably, the lifting mechanism includes several sets of top rods penetrating the support mesh, wherein the top rods are pneumatic lifting rods, and the top of the top rods is inclined toward the outlet of the cooling mechanism.

[0016] Preferably, the spacing between the push rods is smaller than the outer diameter of the material particles, wherein the push rods in the lifting mechanism gradually increase in height from the outlet of the cooling mechanism to the inlet of the cooling mechanism, and the inclination of the top surface of the push rods is continuously distributed when the lifting mechanism is fully lifted.

[0017] By adopting the above technical solution, the supporting mesh in the cooling mechanism is penetrated by the top rod of the lifting mechanism. The material introduced into the cooling mechanism is placed on the top of the supporting mesh. The air inlet pipe below the supporting mesh introduces outside air, which comes into contact with the material and is then discharged through the air outlet pipe above the supporting mesh. Furthermore, each set of top rods in the lifting mechanism is lifted sequentially from longest to shortest. During the lifting process, the inclined surface at the top of the top rod flips the material towards the discharge port. During the flipping process, the contact area between the material and the air is increased, improving the uniformity of heat dissipation and facilitating the stable and uniform cooling of the calcined material.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. The multi-stage temperature-controlled calcination device of this application adopts a curved heating method. Before heating the material, the residual heat of the calcination chamber is used to preheat the material. By segmented temperature control, the heating rate, holding time and temperature range are strictly controlled. The entire calcination process can be carried out under strict temperature control, ensuring that the structure of the zirconia microspheres is more compact and uniform, avoiding problems such as sintering agglomeration and cracks in traditional methods, and improving the performance and application value of the product.

[0020] 3. The apparatus of this application, by using this calcination method, can also enhance the bonding force between particles in the zirconia microspheres. By maintaining a suitable temperature for a longer period of time, the bonding between particles becomes stronger, avoiding particle detachment and structural inhomogeneity caused by rapid sintering. This process effectively improves the toughness, true density, and strength of the zirconia microspheres, thereby optimizing the overall performance of the product and improving the service life and reliability of the microspheres. Through this optimized calcination process, the final product not only has higher mechanical strength but also maintains better stability under high temperature and harsh environments, meeting the application requirements for higher performance. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the overall structure of a multi-stage temperature-controlled calcination device for zirconium oxide.

[0022] Explanation of reference numerals in the attached drawings: 1. Main body; 11. Cylinder; 2. Heating mechanism; 21. Preheating chamber; 211. Stirring mechanism; 2111. Feeding plate; 22. Calcination chamber; 221. Heating resistor; 222. Temperature sensor; 223. Motor; 224. Sealing plate; 2241. Exhaust valve; 225. Second solenoid valve; 3. Feeding mechanism; 31. Hopper; 311. First solenoid valve; 32. Feeding mechanism; 321. Conveyor belt; 3211. Isolation plate; 322. Feeding plate; 323. Exhaust port; 3231. Filter; 4. Cooling mechanism; 41. Support mesh; 42. Air outlet pipe; 43. Air inlet pipe; 44. Lifting mechanism; 441. Lifting rod; 5. PLC controller; 6. Operating table; 7. Limit plate. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0024] This application discloses a multi-stage temperature-controlled calcination apparatus for zirconium oxide.

[0025] Reference Figure 1A multi-stage temperature-controlled calcination device for zirconia includes a main body 1, a heating mechanism 2 inside the main body 1, a feeding mechanism 3 installed at the inlet of the heating mechanism 2, and a cooling mechanism 4 installed at the outlet. The heating mechanism 2 includes a preheating chamber 21 and a calcination chamber 22, wherein the calcination chamber 22 is rotatably installed inside the main body 1, and heating resistors 221 are uniformly installed outside the calcination chamber 22. Temperature sensors 222 are uniformly installed inside the calcination chamber 22. The main body 1 is controlled by a PLC controller 5, and the PLC controller 5 is installed on an operating table 6. The main body 1 includes a feeding mechanism 3, which comprises a hopper 31 and a feeding mechanism 32. The hopper 31 has a first solenoid valve 311 installed at its bottom outlet. The feeding mechanism 32 includes a conveyor belt 321 at the bottom of the hopper 31 and a feeding plate 322 at the inlet of the heating mechanism 2. The conveyor belt 321 has spaced partition plates 3211 on its surface. The feeding plate 322 is driven by a cylinder 11 on the main body 1. A preheating chamber 21 has its inlet and outlet connected to the inlet of the heating mechanism 2 and the inlet of the calcination chamber 22, respectively. The main body 1 supplies the heating mechanism 2 with zirconia microspheres to be calcined via the feeding mechanism 3. The first solenoid valve 311 at the outlet of the hopper 31 controls the uniform discharge of the hopper 31. A fixed amount of material is uniformly transferred between the partition plates 3211 on the conveyor belt 321. After being conveyed by the conveyor belt 321 to the feeding plate 322, the material is driven by the cylinder 11 to guide the feeding plate 322 into the heating mechanism 2. After the material entering the heating mechanism 2 is preheated in the preheating chamber 21, it is introduced into the calcination chamber 22. The heating resistor 221 and temperature sensor 222 in the calcination chamber 22 are controlled by the PLC controller 5 on the operating table 6. The curve heating method is adopted. The heating rate, holding time and temperature range in the calcination chamber 22 are set by segmented temperature control. After the material is calcined in the calcination chamber 22, the material is discharged into the cooling mechanism 4 for cooling and then discharged.

[0026] Reference Figure 1 The preheating chamber 21 adopts a cylindrical drum structure. A stirring mechanism 211 is spirally distributed within the preheating chamber 21. The stirring mechanism 211 includes several conveying plates 2111 arranged in a circular array, capable of clockwise transporting the material introduced into the preheating chamber 21 through the inlet to the outlet of the preheating chamber 21. Limiting plates 7 are installed at the free ends of both the conveying plates 2111 and the inlet plate 322. The gap between the outer surface of the limiting plate 7 of the conveying plate 2111 and the inner wall of the preheating chamber 21 is smaller than the particle size of the material. The introduced material enters the drum of the preheating chamber 21. The rotation of the stirring mechanism 211 drives the material from the inlet of the preheating chamber 21 clockwise to the outlet of the preheating chamber 21. The stirring mechanism 211 drives the circular array of conveying plates 2111 to rotate via a motor 223. The limiting plates 7 installed at the free ends of the conveying plates 2111 collectively support the material and transport it within the preheating chamber 21.

[0027] Reference Figure 1One end of the calcination chamber 22 is connected to the output end of the motor 223, and the other end has an opening. A sealing plate 224 is detachably installed on the opening, and an exhaust valve 2241 is provided on the sealing plate 224. A discharge port corresponding to the feed port of the cooling mechanism 4 is provided at the center of the bottom of the calcination chamber 22, and a second solenoid valve 225 is installed on the discharge port. An exhaust port 323 is provided at the top of the feeding mechanism 32, and a filter 3231 is installed on the exhaust port 323. The calcining chamber 22 is driven to rotate by a motor 223 at one end. The material introduced into the calcining chamber 22 is continuously turned during heating and calcination, ensuring uniform heating and calcination. A detachable sealing plate 224 at the opening of the other end of the calcining chamber 22 can be removed and installed from the top of the chamber for easy sealing. An exhaust valve 2241 at the center of the sealing plate 224 can depressurize the calcining chamber 22 during calcination, and the high-temperature gas discharged from the calcining chamber 22 can enter the preheating chamber 21, providing heat for preheating. A second solenoid valve 225 installed at the bottom outlet of the calcining chamber 22 can be opened to discharge material after calcination is complete.

[0028] Reference Figure 1 The cooling mechanism 4 includes a support mesh 41 for storing calcined materials. The support mesh 41 is connected to an outlet pipe 42 and an inlet pipe 43 at its top and bottom, respectively. A lifting mechanism 44 for turning over materials is installed at the bottom of the support mesh 41. The lifting mechanism 44 includes several sets of lifting rods 441 penetrating the support mesh 41. These lifting rods 441 are pneumatic lifting rods, and their tops are inclined towards the outlet of the cooling mechanism 4. The spacing between the lifting rods 441 is smaller than the outer diameter of the material particles. The lifting rods 441 gradually increase in height from the outlet to the inlet of the cooling mechanism 4, and the inclination of the top surfaces of the lifting rods 441 is continuous when the lifting mechanism 44 is fully lifted. The supporting mesh 41 inside the cooling mechanism 4 is penetrated by the top rod 441 of the lifting mechanism 44. The material introduced into the cooling mechanism 4 is placed on the top of the supporting mesh 41. The air inlet pipe 43 below the supporting mesh 41 introduces outside air, which comes into contact with the material and then discharges hot air through the air outlet pipe 42 above the supporting mesh 41. The top rods 441 in the lifting mechanism 44 are lifted sequentially from longest to shortest. During the lifting process, the inclined surface at the top of the top rod 441 flips the material towards the discharge port. During the flipping process, the contact area between the material and the air is increased, the heat dissipation uniformity is improved, and it is beneficial to the stable and uniform cooling of the calcined material.

[0029] Working principle: The first solenoid valve 311 at the outlet of the hopper 31 controls the uniform discharge of material from the hopper 31. A fixed amount of material is uniformly transported between the partition plates 3211 on the conveyor belt 321. After being conveyed by the conveyor belt 321 to the feeding plate 322, the material is driven by the cylinder 11 to be introduced into the heating mechanism 2. The material entering the heating mechanism 2 is preheated in the preheating chamber 21 and then introduced into the calcining chamber 22. The calcining chamber 22 adopts a curved heating method, including a heating stage of 0-200℃, a holding stage of 200℃, a heating section of 200-800℃, a holding section of 800℃, and a heating section of 800-1600℃. The heating rate, holding time, and temperature range in the calcining chamber 22 are set by segmented temperature control. After the material is calcined in the calcining chamber 22, it is discharged into the cooling mechanism 4. The support mesh 41 in the cooling mechanism 4... The material introduced into the cooling mechanism 4 is placed on the top of the support net body 41 through the lifting mechanism 44. The air inlet pipe 43 below the support net body 41 introduces outside air, which comes into contact with the material and then discharges hot air through the air outlet pipe 42 above the support net body 41. The lifting mechanism 44 lifts the material in groups from long to short. During the lifting process, the inclined surface at the top of the lifting rod 441 flips the material towards the discharge port until the material is cooled and discharged from the discharge port.

[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-stage temperature-controlled calcination device for zirconia, characterized by: The utility model provides a calcining device, including the main part (1), the main part (1) is equipped with heating mechanism (2) in, and the feeding opening of heating mechanism (2) is equipped with feeding mechanism (3), and the discharge port is equipped with cooling mechanism (4), heating mechanism (2) includes preheating chamber (21) and calcining chamber (22), wherein calcining chamber (22) rotationally installs in the main part (1), and calcining chamber (22) is evenly installed with heating resistance (221) outside, and calcining chamber (22) is evenly installed with temperature sensor (222) inside, the main part (1) is controlled through PLC controller (5), and PLC controller (5) is installed in operating platform (6) inside, feeding mechanism (3), feeding mechanism (3) includes bin (31) and feeder mechanism (32), wherein bin (31) bottom discharge port is equipped with first solenoid valve (311), feeder mechanism (32) includes the conveyer belt (321) of bin (31) bottom and the feeding plate (322) of heating mechanism (2) feeding opening, wherein the surface of conveyer belt (321) is spaced apart and is distributed with the baffle (3211) of isolation, and feeding plate (322) is driven through the pneumatic cylinder (11) on the main part (1), Preheating chamber (21), the inlet and outlet of preheating chamber (21) are communicated with the feeding opening of heating mechanism (2) and the feeding opening of calcining chamber (22) respectively.

2. The multi-stage temperature-controlled calcination device of zirconia according to claim 1, characterized in that: The preheating chamber (21) adopts cylindrical drum structure, and stirring mechanism (211) is spirally distributed in the preheating chamber (21), wherein the stirring mechanism (211) comprises a plurality of material conveying plates (2111) arranged in a circumferential array and capable of transporting the material introduced into the feeding opening of the preheating chamber (21) clockwise to the outlet of the preheating chamber (21).

3. The multi-stage temperature-controlled calcination device of zirconia according to claim 2, characterized in that: The free ends of the material conveying plates (2111) and the feeding plate (322) are each provided with a limiting plate (7), wherein the gap between the outer side of the limiting plate (7) of the material conveying plate (2111) and the inner wall of the preheating chamber (21) is smaller than the particle size of the material.

4. The multi-stage temperature-controlled calcination device of zirconia according to claim 1, characterized in that: One end of the calcining chamber (22) is connected with the output end of the motor (223), the other end is provided with an opening, and the sealing plate (224) is detachably installed on the opening, and the exhaust valve (2241) is opened on the sealing plate (224), and the discharge opening corresponding to the feeding opening of the cooling mechanism (4) is opened in the center of the bottom of the calcining chamber (22), and the second solenoid valve (225) is installed on the discharge opening.

5. The multi-stage temperature-controlled calcination device of zirconia according to claim 4, characterized in that: The top of the feeding mechanism (32) is provided with an exhaust port (323), and a filter (3231) is installed on the exhaust port (323).

6. The multi-stage temperature-controlled calcination device of zirconia according to claim 1, characterized in that: The cooling mechanism (4) is provided with a support net body (41) for storing the calcined material, and the upper and lower parts of the support net body (41) are respectively communicated with the air outlet pipeline (42) and the air inlet pipeline (43), and the bottom of the support net body (41) is provided with a jacking mechanism (44) for transporting the material.

7. The multi-stage temperature-controlled calcination device of zirconia according to claim 6, characterized in that: The jacking mechanism (44) comprises a plurality of groups of jacking rods (441) penetrating through the support net body (41), wherein the jacking rod (441) is a pneumatic lifting rod, and the top of the jacking rod (441) is inclined towards the outlet direction of the cooling mechanism (4).

8. The multi-stage temperature-controlled calcination device of zirconia according to claim 7, characterized in that: The distance between the said jacks (441) is less than the outer diameter of the material particles, wherein the jacks (441) in the said jacking mechanism (44) gradually increase from the outlet of the cooling mechanism (4) to the entrance of the cooling mechanism (4), and the inclination of the top surface of the jacks (441) is continuously distributed when the jacking mechanism (44) is fully jacked up.

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