Gelatin-molded ceramic slurry preparation apparatus

Abstract

The application discloses a ceramic slurry preparation equipment for gel casting, and relates to the technical field of preparation equipment.The ceramic slurry preparation equipment for gel casting comprises a vacuum stirring assembly, a temperature control assembly and a vacuum feeding assembly.The vacuum stirring assembly comprises a stirring barrel, a stirrer and a vacuum pump in communication with the stirring barrel.The stirrer is inserted into the stirring barrel to stir the slurry in the stirring barrel.The temperature control assembly comprises a cooling circulator in communication with the stirring barrel and a temperature sensor.The cooling circulator is used for cooling the slurry in the stirring barrel, and the temperature sensor is used for measuring the slurry temperature of the stirring barrel.The vacuum feeding assembly comprises a peristaltic pump and a sealed container in communication with the stirring barrel.The sealed container and the stirring barrel are respectively in communication with the peristaltic pump, and are used for precisely adding catalysts and initiators into the stirring barrel under the vacuum and isobaric environment.The application realizes the full automation of the preparation of the ceramic slurry for gel casting in the same equipment, and also reduces the generation of air bubbles in the preparation process of the ceramic slurry.

Description

Technical Field

[0001] This invention relates to the field of preparation equipment technology, and in particular to a ceramic slurry preparation equipment for gel injection molding. Background Technology

[0002] In existing technologies for preparing ceramic slurries for gel casting, the processes involving vacuum degassing, cooling, and the addition of catalysts and initiators are typically carried out in separate, independent steps using separate equipment. This decentralized operation mode results in a significant lack of automation and integration in the entire process. Specifically, it manifests as frequent material transfers, equipment switching, and manual intervention between each step, making the operation extremely cumbersome. This not only leads to low production efficiency but also heavily relies on a large number of operators for manual control and coordination. These shortcomings make it difficult for existing processes to meet the demands of large-scale, continuous batch production, becoming a key bottleneck restricting the industrialization and efficiency improvement of related products. Therefore, a highly integrated and automated innovative solution is urgently needed.

[0003] Furthermore, in existing gel casting ceramic slurry preparation technologies, the process of vacuum degassing followed by stirring and dropwise addition of catalysts and initiators is usually carried out in air. After vacuum degassing, the slurry is easily entangled with new air during stirring, generating bubbles and leading to defects such as pores inside the cured ceramic body. For gel casting ceramic slurries of acrylamide / N,N-methylenebisacrylamide (AM / MBAM), methacrylamide / N,N-methylenebisacrylamide (MAM / MBAM), N,N-dimethylacrylamide / N,N-methylenebisacrylamide (DMAA / MBAM), and hydroxyethyl methacrylate / N,N-methylenebisacrylamide (HEMA / MBAM) systems, oxygen resistance occurs during curing due to the presence of oxygen in the slurry, resulting in defects such as pores and peeling after curing. These defects will cause a significant decrease in the performance of gel-cast ceramics after sintering, and may even lead to sintering fracture. Therefore, how to avoid the introduction of air during the preparation of ceramic slurry for gel casting is an urgent problem that needs to be solved in the preparation of ceramic slurry for gel casting. Summary of the Invention

[0004] The main objective of this invention is to propose a ceramic slurry preparation device for gel casting, which integrates the functions of vacuum defoaming, cooling, and adding reactants under vacuum conditions into the same device. This automates the preparation of ceramic slurry for gel casting, simplifies the operation, improves the preparation efficiency, and minimizes the introduction of air during the preparation of ceramic slurry for gel casting, thereby reducing the formation of defects such as pores after the slurry solidifies.

[0005] To achieve the above objectives, the present invention proposes a ceramic slurry preparation device for gel casting, the ceramic slurry preparation device for gel casting comprising:

[0006] A vacuum mixing assembly includes a mixing tank, a stirrer, and a vacuum pump. One end of the stirrer extends into the mixing tank, and the vacuum pump is connected to the mixing tank. The stirrer is used to stir the slurry in the mixing tank, and the vacuum pump is used to evacuate the mixing tank during the mixing process.

[0007] A temperature control component, comprising a cooling circulator and a temperature sensor, wherein the cooling circulator is connected to the mixing tank and is used to cool the slurry inside the mixing tank, and the temperature sensor is used to measure the temperature of the slurry inside the mixing tank in real time;

[0008] The vacuum feeding assembly includes a peristaltic pump and a sealed container. The inlet of the peristaltic pump is connected to the sealed container, and the outlet of the peristaltic pump is connected to the stirring tank. The sealed container is connected to the stirring tank, which is used to accurately add catalysts and initiators to the stirring tank under vacuum and isobaric conditions.

[0009] In one embodiment, the mixing tank includes:

[0010] A flat-bottomed inner tank for holding slurry;

[0011] The outer barrel body contains the flat-bottomed inner barrel, which forms a jacket between the outer barrel body and the flat-bottomed inner barrel. The jacket is connected to the cooling circulation machine and is used to flow the cooling medium.

[0012] The container includes a lid, which has a vacuum port, a peristaltic pump hose inlet, a constant pressure port, an exhaust port, and a vacuum gauge. The vacuum pump is connected to the flat-bottomed inner container through the vacuum port, and the liquid outlet of the peristaltic pump is connected to the flat-bottomed inner container through the peristaltic pump hose inlet. The sealed container is connected to the flat-bottomed inner container through the constant pressure port. The exhaust port is used to achieve pressure balance between the flat-bottomed inner container and the ambient air. The vacuum gauge is installed on the lid through a threaded through-hole to display the vacuum level of the flat-bottomed inner container in real time.

[0013] In one embodiment, ball valves are installed on the vacuum hole, peristaltic pump hose inlet, constant pressure hole, and exhaust hole of the barrel lid.

[0014] In one embodiment, a vacuum pump gas-water separator is provided between the vacuum pump and the flat-bottomed inner tank. The vacuum pump gas-water separator is used to measure the amount of water loss in the slurry during the vacuuming process of the ceramic slurry preparation equipment.

[0015] In one embodiment, the inlet of the peristaltic pump hose is a tapered conical structure, and the hose at the outlet of the peristaltic pump is set as a conical surface and inserted into the inlet of the peristaltic pump hose through the conical surface coupling to connect the outlet of the peristaltic pump with the flat-bottomed inner bucket.

[0016] In one embodiment, the stirrer includes a motor, a speed reducer, stirring blades, and a stirring shaft. The motor is drivenly connected to the speed reducer. The end of the speed reducer away from the motor is connected to the stirring shaft. The end of the stirring shaft away from the speed reducer extends into the stirring tank and is connected to the stirring blades.

[0017] In one embodiment, a mechanical seal structure is provided between the stirring shaft and the stirring tank. The mechanical seal structure includes a flange, a stationary ring, a rotating ring, a spring, a spring seat, and a sealing ring assembly. The flange is fixedly installed on the tank cover of the stirring tank by bolts. The stationary ring is fixedly installed on the flange. The rotating ring is sleeved on the stirring shaft and rotates synchronously with it. The end face of the rotating ring and the end face of the stationary ring are in contact with each other to form an axial sealing pair. The spring seat is sleeved on the stirring shaft and rotates synchronously with it. The two ends of the spring are respectively connected to the back of the spring seat and the rotating ring to provide axial clamping force to the rotating ring, so that it keeps in close contact with the stationary ring. The sealing ring assembly includes a rotating ring O-ring disposed on the inner ring of the rotating ring, a stationary ring O-ring disposed between the stationary ring and the flange, and a spring seat O-ring disposed between the stirring shaft and the spring seat.

[0018] In one embodiment, the stirring blade is a single-layer, double-layer, or multi-layer cross-shaped blade.

[0019] In one embodiment, the jacket is provided with an inlet and an outlet that communicate with the cooling circulation machine. The inlet and the outlet are used to allow cooling medium to circulate and cool the slurry in the flat-bottomed inner tank.

[0020] In one embodiment, the temperature sensor includes a temperature sensor sleeve welded to the lid of the mixing tank and a digital thermocouple. The temperature sensor sleeve extends vertically into the flat-bottomed inner tank, and the digital thermocouple is fixed in the temperature sensor sleeve for real-time measurement of the slurry temperature inside the flat-bottomed inner tank.

[0021] The present invention provides a ceramic slurry preparation device for gel injection molding, comprising a vacuum stirring assembly, a temperature control assembly, and a vacuum feeding assembly. The vacuum stirring assembly includes a stirring tank, a stirrer, and a vacuum pump. One end of the stirrer extends into the stirring tank, and the vacuum pump is connected to the stirring tank. The temperature control assembly includes a cooling circulator and a temperature sensor. The cooling circulator is connected to the stirring tank and is used to cool the slurry inside the stirring tank. The temperature sensor is used to measure the temperature of the slurry inside the stirring tank in real time. The vacuum feeding assembly includes a peristaltic pump and a sealed container. The inlet end of the peristaltic pump is connected to the sealed container, and the outlet end of the peristaltic pump is connected to the stirring tank. The sealed container is connected to the stirring tank, enabling precise addition of catalysts and initiators to the stirring tank under vacuum and isobaric conditions. Through the physical integration of functional modules, vacuum defoaming, temperature control, and the addition of catalysts and initiators in a vacuum environment are completed simultaneously within a single container, eliminating time losses and material losses due to equipment switching. Process parameters can be centrally controlled, and operators only need to set the program to complete the fully automated production process, thereby achieving automation, simplifying operation, and improving preparation efficiency. Meanwhile, the preparation of ceramic slurry for gel casting is completed under vacuum, avoiding the reintroduction of air and the generation of bubbles during the stirring and addition of catalysts and initiators in the air, which would otherwise lead to defects such as porosity in the cured ceramic green body. Furthermore, it effectively avoids the oxygen barrier defects caused by the presence of oxygen in the slurry during the curing of gel casting ceramic slurries in AM / MBAM, MAM / MBAM, DMAA / MBAM, and HEMA / MBAM systems. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the ceramic slurry preparation equipment for gel casting provided by the present invention;

[0024] Figure 2 A schematic diagram of the structure of the bucket lid of the mixing tank of the gel casting ceramic slurry preparation equipment provided by the present invention;

[0025] Figure 3 The SiC ceramic blank (B) prepared by gel casting using the ceramic slurry preparation equipment of the present invention and the SiC ceramic blank prepared by gel casting using the conventional method are compared.

[0026] Figure 4 A schematic diagram of the mechanical seal structure of the ceramic slurry preparation equipment for gel injection molding provided by the present invention.

[0027] Explanation of icon numbers:

[0028] 10. Vacuum stirring assembly; 11. Stirring tank; 111. Flat-bottomed inner tank; 112. Outer tank body; 11a. Jacket; 11b. Water inlet; 11c. Water outlet; 113. Tank lid; 113a. Vacuum port; 113b. Peristaltic pump hose inlet; 113c. Constant pressure port; 113d. Exhaust port; 113e. Vacuum gauge; 12. Stirrer; 121. Motor; 122. Reducer; 123. Stirring blades; 124. Stirring shaft; 13. Vacuum pump; 14. Mechanical seal structure; 141. Flange; 142. Stationary ring; 143. Rotating ring; 144. Spring; 145. Spring seat; 146. Rotating ring O-ring; 147. Stationary ring O-ring; 148. Spring seat O-ring; 20. Temperature control assembly; 21. Cooling circulator; 22. Temperature sensor; 221. Temperature sensor sleeve; 222. Digital display thermocouple; 30. Vacuum feeding assembly; 31. Peristaltic pump; 32. Sealed container; 40. Vacuum pump gas-water separator.

[0029] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] In existing technologies for preparing ceramic slurries for gel casting, the processes involving vacuum degassing, cooling, and precise addition of catalysts and initiators are typically carried out in separate, independent equipment steps. This decentralized operation mode leads to frequent material transfers, equipment switching, and manual intervention throughout the process, making the operation extremely cumbersome and difficult to meet the needs of large-scale, continuous batch production. For example, in the ceramic slurry preparation process, operators need to first complete the mixing in a stirring device, then transfer it to a vacuum device for degassing, followed by connecting it to a cooling system to control the temperature, and finally add the catalyst and initiator under stirring using a peristaltic pump or hand-held burette. The entire process suffers from low efficiency and poor process stability. Furthermore, the process of adding catalysts and initiators to the slurry after vacuum degassing and cooling is usually carried out in air stirring. The slurry after vacuum degassing is prone to generating bubbles due to the reintroduction of air during stirring, which can lead to defects such as pores inside the ceramic body after curing. For gel casting ceramic slurries of AM / MBAM, MAM / MBAM, DMAA / MBAM, and HEMA / MBAM systems, the oxygen barrier effect caused by the presence of oxygen in the slurry during curing can also lead to defects.

[0034] To address the aforementioned problems, the inventors observed that the fragmented functions of equipment in traditional processes were the core reason for low efficiency. Analysis revealed that vacuum degassing, mechanical stirring, and temperature control of the slurry could be integrated, avoiding material transfer, equipment switching, and manual intervention in the process flow. This simplified and automated the process, meeting the demands of large-scale, continuous batch production. Further research revealed that adding catalysts and initiators to the slurry in an air environment was the main reason for the reintroduction of air into the slurry, leading to air bubbles and oxygen barrier defects in the cured green body. Further analysis showed that during vacuum stirring, a peristaltic pump could achieve stable, precise, and quantitative addition of catalysts and initiators under vacuum isobaric conditions, effectively preventing the reintroduction of air and bubble formation during the addition of catalysts and initiators in air. Based on these findings, a technical concept was ultimately developed that integrates vacuum stirring, circulating cooling, and peristaltic pump vacuum isobaric quantitative injection into a single device.

[0035] Therefore, please refer to Figure 1 and Figure 2 This application proposes a ceramic slurry preparation device for gel casting, which includes a vacuum stirring assembly 10, a temperature control assembly 20, and a vacuum feeding assembly 30. The vacuum stirring assembly 10 includes a stirring tank 11, a stirrer 12, and a vacuum pump 13. One end of the stirrer 12 extends into the stirring tank 11, and the vacuum pump 13 is connected to the stirring tank 11. The temperature control assembly 20 includes a cooling circulator 21 and a temperature sensor 22. The cooling circulator 21 is connected to the stirring tank 11. The vacuum feeding assembly 30 includes a peristaltic pump 31 and a sealed container 32. The inlet end of the peristaltic pump 31 is connected to the sealed container 32, and the outlet end is connected to the stirring tank 11. The sealed container 32 is mainly used to hold solutions such as catalysts and initiators.

[0036] In this embodiment, the vacuum stirring assembly 10 refers to a device that uses mechanical stirring in conjunction with a vacuum environment to achieve simultaneous stirring and vacuuming. The temperature control assembly 20 refers to a device that controls the slurry temperature through the circulation of a heat exchange medium, and uses a temperature sensor 22 to monitor and maintain the temperature stability of the slurry in real time during the dynamic process. The vacuum feeding assembly 30 refers to a device that uses the flexible tube compression of a peristaltic pump 31 to achieve quantitative delivery under vacuum and isobaric conditions. Specifically, it can be achieved by using a stepper motor to drive rollers to compress the silicone tube, ensuring the metering accuracy of liquid addition under vacuum and isobaric conditions.

[0037] Specifically, the agitator 12 stirs the slurry in a vacuum environment established by the vacuum pump 13, and performs vacuum degassing while stirring. Compared to vacuum degassing, vacuum stirring degassing can remove air bubbles from the slurry more thoroughly. The cooling medium continuously circulates within the mixing tank 11, regulating the temperature of the slurry within the mixing tank 11 through heat conduction. By regulating the slurry temperature, the curing rate of the slurry can be controlled, preventing premature curing. The peristaltic pump 31 injects the catalyst and initiator solutions into the mixing tank 11 quantitatively under vacuum isobaric conditions through periodic compression via an elastic pipe. The delivery rate can be precisely controlled by the motor speed within the peristaltic pump 31. All three components are spatially integrated into the same operating unit.

[0038] Compared to existing technologies, traditional processes require the sequential use of three pieces of equipment: a mixer, a vacuum tank, and a cooling tank. Each step necessitates reloading materials and adjusting process parameters. This solution, through the physical integration of functional modules, allows vacuum degassing, temperature control, and the vacuum isobaric addition of catalysts and initiators to be completed within a single container. This eliminates the inconvenience of equipment switching and human error. Process parameters can be centrally controlled, and operators only need to set the program to complete the fully automated production process, thus achieving automation, simplifying operation, and improving preparation efficiency. Furthermore, the preparation of the ceramic slurry for gel casting is completed in a vacuum environment, avoiding the reintroduction of air and the generation of bubbles during the mixing and dripping of catalysts and initiators in the air, which can lead to defects such as porosity in the cured ceramic body. Additionally, it effectively avoids the defects caused by oxygen resistance due to the presence of oxygen in the slurry during the curing of gel casting ceramic slurries in AM / MBAM, MAM / MBAM, DMAA / MBAM, and HEMA / MBAM systems.

[0039] Please see Figure 1 and Figure 2 This application further proposes that the mixing tank 11 includes a flat-bottomed inner tank 111, an outer tank body 112, and a tank lid 113. The flat-bottomed inner tank 111 is used to hold the slurry; the outer tank body 112 houses the flat-bottomed inner tank 111 inside it and forms a jacket 11a between the outer tank body 112 and the flat-bottomed inner tank 111. The jacket 11a is connected to the cooling circulation machine 21 for the flow of cooling medium; the tank cover 113 is provided with a vacuum hole 113a, a peristaltic pump hose inlet 113b, a constant pressure hole 113c, an exhaust hole 113d and a vacuum gauge 113e. The vacuum pump 13 is connected to the flat-bottomed inner tank 111 through the vacuum hole 113a. The liquid outlet of the peristaltic pump 31 is connected to the flat-bottomed inner tank 111 through the peristaltic pump hose inlet 113b. The sealed container 32 is connected to the flat-bottomed inner tank 111 through the constant pressure hole 113c. The exhaust hole 113d is used to achieve pressure balance between the flat-bottomed inner tank 111 and the ambient air pressure. The vacuum gauge 113e is installed and fixed on the tank cover 113 through a threaded through hole for real-time display of the vacuum degree of the flat-bottomed inner tank 111.

[0040] In this embodiment, the flat-bottomed inner barrel 111 refers to a container with a flat bottom that can withstand a pressure difference of more than one atmosphere. It can be made of stainless steel. The flat-bottomed structure facilitates a uniform flow of the slurry during mixing. The outer barrel 112 refers to the shell fitted around the flat-bottomed inner barrel 111. It can be made of a single layer of stainless steel. The jacket 11a formed by the outer barrel 112 and the flat-bottomed inner barrel 111 serves as a cooling medium flow channel, reducing the temperature of the flat-bottomed inner barrel 111 through heat exchange. The jacket 11a is an annular cavity formed by welding the flat-bottomed inner barrel 111 and the outer barrel 112, within which the cooling medium forms a circulating flow path. The lid 113 refers to the sealing cover that covers the top of the flat-bottomed inner barrel 111. It can be secured using quick-release bolts and locking clips. The vacuum port 113a, peristaltic pump hose inlet 113b, constant pressure port 113c, vent port 113d, and vacuum gauge 113e are evenly distributed at equal angles along the circumference of the lid 113 to optimize sealing performance. The vacuum port 113a is a circular through-hole penetrating the lid 113, which can be implemented using an embedded stainless steel liner, used to establish a direct air passage connection between the vacuum pump 13 and the flat-bottomed inner barrel 111. The peristaltic pump hose inlet 113b is a tubular interface with a tapered guide structure, which can be made of stainless steel. The outlet hose of the peristaltic pump 31 is pressed against the peristaltic pump hose inlet 113b by the tapered surface to form an airtight connection. The constant pressure port 113c refers to a tubular interface with external threads, which can be implemented using a quick-connect clamp. It is used to connect the sealed container 32 and the flat-bottomed inner barrel 111, and to achieve pressure balance between the sealed container 32 and the flat-bottomed inner barrel 111. The vent port 113d refers to a channel structure connecting the interior of the flat-bottomed inner barrel 111 with the external environment. It is used to achieve pressure balance between the flat-bottomed inner barrel 111 and the external environment after the ceramic slurry for gel injection molding is prepared in a vacuum environment, so that the barrel lid 113 can be opened for pouring and injection molding. The vacuum gauge 113e is an instrument installed and fixed on the threaded barrel hole of the barrel lid 113 to measure the gas pressure inside the sealed container 32. It is used to display the vacuum degree of the flat-bottomed inner barrel 111 in real time during the preparation of the ceramic slurry for gel injection molding, and can monitor the airtightness of the equipment, i.e., whether there is gas leakage, during the slurry preparation process.

[0041] Specifically, the flat-bottomed inner barrel 111 serves as a slurry mixing container. Its flat bottom design eliminates dead zones in the mixing process, allowing the materials to be fully mixed in a vacuum environment. The jacket 11a structure formed by the outer barrel 112 and the flat-bottomed inner barrel 111 continuously dissipates the heat generated by the slurry itself and the mixing process through the circulation of a cooling medium. This, combined with the temperature control component 20, precisely regulates the temperature of the slurry, preventing the slurry from becoming too cold, which would increase its viscosity and affect its stability, or from becoming too hot, which would cause the slurry to solidify prematurely and lead to casting failure. The lid 113 integrates a vacuum port 113a that directly connects the vacuum pump 13 to the flat-bottomed inner barrel 111, eliminating air bubbles through rapid vacuuming and stirring. The peristaltic pump hose inlet 113b adopts a tapered surface structure to maintain the sealing of the hose and interface under vacuum negative pressure. The constant pressure port 113c connects to the sealed container 32 and the flat-bottomed inner barrel 111 through an air pipe, allowing the catalyst and initiator to be stably and accurately injected into the flat-bottomed inner barrel 111 under no pressure difference through the peristaltic pump 31, achieving stable and precise metering of catalyst and initiator addition. The vent port 113d is a channel connecting the flat-bottomed inner barrel 111 to the atmospheric environment. After the ceramic slurry for gel casting is prepared, the vent port 113d achieves pressure balance between the flat-bottomed inner barrel 111 and the atmospheric environment, facilitating the opening of the lid 113 for pouring and casting. Molding is necessary; otherwise, it would be difficult to open the lid 113 for pouring and molding under atmospheric pressure differential. The vacuum gauge 113e is fixed to the lid 113 via a threaded through-hole and forms a through-connection with the flat-bottomed inner barrel 111, allowing pressure changes inside the inner barrel to be directly transmitted to the sensing element or instrument of the vacuum gauge 113e. Specifically, a pointer-type or digital vacuum pressure gauge can be used, with its range adjustable according to process requirements. The threaded through-hole refers to a through-hole with an internal thread structure machined on the surface of the lid 113, achieving a rigid connection between the vacuum gauge 113e and the lid 113 through threaded engagement. The vacuum degree of the flat-bottomed inner barrel 111 refers to the negative pressure state of the slurry environment during mixing, specifically formed by the suction action of the vacuum pump 13. Its value directly reflects the pressure changes in the slurry mixing environment. All functional interfaces are centrally arranged on the lid 113, enabling simultaneous completion of slurry vacuum mixing and defoaming, slurry temperature control, and catalyst and initiator injection into the slurry within a single device.

[0042] Compared to existing technologies, traditional processes require transferring the slurry between different devices to complete defoaming, cooling, and catalyst and initiator injection, resulting in complex operations and potential contamination risks. This solution integrates heat exchange, vacuum processing, and vacuum isobaric material conveying into a single mixing tank 11 through a jacketed cooling system 11a and an integrated lid 113, eliminating the material transfer step. The nested structure of the flat-bottomed inner tank 111 and the outer tank 112 improves cooling efficiency within the same floor space. The multi-port integrated design of the lid 113 reduces equipment switching and manual operation steps compared to separate pipe connections. Specifically, the vacuum feeding component 30 enables stable and precise addition of catalysts and initiators to the ceramic slurry for gel casting under vacuum conditions, allowing ceramic slurry preparation to be completed in a vacuum environment. This effectively defoams the ceramic slurry and prevents the reintroduction of air, significantly improving the quality of the prepared ceramic slurry for gel casting. The temperature control component 20 provides real-time feedback on the slurry temperature and enables precise temperature control. The design of the vacuum gauge 113e can monitor the dynamic changes in vacuum during the slurry preparation process in real time, ensuring good equipment sealing and no air leakage.

[0043] Please see Figure 1 and Figure 2 This application further proposes that ball valves are welded to the vacuum port 113a, the peristaltic pump hose inlet 113b, the constant pressure port 113c, and the exhaust port 113d.

[0044] In this embodiment, the ball valve refers to the opening and closing control component installed at the vacuum port 113a, peristaltic pump hose inlet 113b, constant pressure port 113c, and exhaust port 113d outlet. Specifically, a manually rotary stainless steel ball valve can be used. By adjusting the valve core, the opening and closing of the vacuum port 113a, peristaltic pump hose inlet 113b, constant pressure port 113c, and exhaust port 113d can be controlled, enabling independent use of the vacuum port 113a, peristaltic pump hose inlet 113b, constant pressure port 113c, and exhaust port 113d in terms of time.

[0045] Specifically, during the vacuum stirring and cooling stage and the vacuum stirring and degassing stage, the ball valve of vacuum port 113a needs to be opened, and the ball valves of peristaltic pump hose inlet 113b, constant pressure port 113c, and exhaust port 113d need to be closed. After the vacuum stirring and degassing stage, during the vacuum isobaric stirring stage for adding catalyst and initiator, the ball valves of vacuum port 113a, peristaltic pump hose inlet 113b, and constant pressure port 113c need to be opened, and the ball valve of exhaust port 113d need to be closed. The peristaltic pump 31 can be started to add catalyst and initiator only after the air pressure in the flat-bottomed inner barrel 111 and the sealed container 32 are balanced. After the vacuum isobaric stirring stage for adding catalyst and initiator, during the pouring and molding stage, the ball valves of vacuum port 113a, peristaltic pump hose inlet 113b, and constant pressure port 113c need to be closed, and the ball valve of exhaust port 113d need to be opened. The barrel lid 113 can be opened for pouring and molding only after the air pressure in the flat-bottomed inner barrel 111 is balanced with atmospheric pressure.

[0046] This solution allows for the sequential implementation of vacuum stirring and cooling, vacuum stirring and degassing, vacuum isobaric stirring and adding catalyst and initiator, and pouring gel molding process by opening and closing ball valves at vacuum hole 113a, peristaltic pump hose inlet 113b, constant pressure hole 113c, and exhaust hole 113d outlet. The operation is simple and convenient, ensuring that each process is independently controllable.

[0047] Please see Figure 1 and Figure 2 This application further proposes to install a vacuum pump gas-water separator 40 between the vacuum pump 13 and the flat-bottomed inner tank 111. The vacuum pump gas-water separator 40 is used to measure the amount of water loss in the slurry during the vacuuming process of the ceramic slurry preparation equipment.

[0048] In this embodiment, the vacuum pump gas-liquid separator 40 refers to the separation device installed between the vacuum pump 13 and the stirring container. Specifically, it can be implemented using a structure with a transparent graduated container. By collecting the extracted gas-liquid mixture and separating the liquid water, the amount of water loss can be directly quantified using the graduations. This device traps water in the container through physical separation, enabling direct measurement of water loss. The flat-bottomed inner tank 111 is connected to the vacuum pump gas-liquid separator 40 through a vacuum hole 113a, ensuring that the vacuum extraction path passes through the vacuum pump gas-liquid separator 40, thereby guaranteeing that all extracted water is captured and measured.

[0049] Specifically, when the vacuum pump 13 is running, the moisture in the slurry is drawn into the vacuum pump gas-liquid separator 40 along with the gas. Within the separator 40, the gas-liquid mixture undergoes phase separation due to the reduced flow rate and structural design. The liquid water is retained in the graduated container, while the gas continues to flow to the vacuum pump 13 and is discharged. By observing the amount of water accumulated in the graduated container, the real-time moisture loss of the slurry during vacuuming can be directly read and replenished in advance, achieving precise control of the slurry's solids content. This prevents the slurry's solids content from continuously increasing due to moisture loss during vacuuming, thus maintaining the slurry's stability.

[0050] This solution directly captures and quantifies moisture through a vacuum pump gas-water separator 40, transforming the data source from indirect estimation to direct measurement. Through this technical solution, this application achieves accurate measurement of slurry moisture loss during vacuuming, avoiding component imbalances caused by uncontrollable moisture loss, ensuring slurry viscosity stability and consistent molding quality, and providing reliable data support for automated, precise proportioning adjustments.

[0051] Please see Figure 1 and Figure 2 This application further proposes that the peristaltic pump hose inlet 113b adopts a tapered conical structure, the hose at the liquid outlet of the peristaltic pump 31 is set as a conical surface, and is inserted into the peristaltic pump hose inlet 113b through conical coupling to connect the liquid outlet of the peristaltic pump 31 with the flat-bottomed inner bucket 111.

[0052] In this embodiment, the tapered conical structure refers to the cross-sectional diameter of the inlet channel gradually decreasing along the insertion direction. Specifically, it can be achieved using a conical or stepped diameter-reducing structure, generating radial compressive force through geometric changes. Conical coupling insertion refers to the surface contact fit between the outer wall of the hose at the liquid outlet end of the peristaltic pump 31 and the conical surface of the peristaltic pump hose inlet 113b. Specifically, it can be achieved by using an interference fit between an elastic silicone material and a metal conical surface, utilizing the elastic deformation of the material to achieve self-sealing.

[0053] Specifically, when the flexible tube at the outlet end of the peristaltic pump 31 is inserted along the tapered surface, the tube wall undergoes elastic deformation due to the radial compression of the tapered surface, resulting in continuous and tight contact between the outer wall of the flexible tube at the outlet end of the peristaltic pump 31 and the tapered surface. Under vacuum negative pressure, the flexible tube at the outlet end of the peristaltic pump 31 maintains a continuous clamping force on the tapered surface due to the elasticity of the material, effectively preventing gas leakage from the connection. The guiding effect of the tapered surface structure allows the flexible tube at the outlet end of the peristaltic pump 31 to automatically center and position itself during insertion, achieving axial constraint without the need for auxiliary fixing devices. When external vibration or pressure fluctuations occur, the frictional force generated by the tapered surface coupling can prevent axial displacement of the silicone tube, maintaining connection stability.

[0054] The conical structure achieves self-sealing through geometric fit, eliminating the risk of leakage caused by loose fasteners. Existing flat-mouth connection methods are prone to local deformation of the silicone tube under vacuum negative pressure, resulting in gaps on the sealing surface. However, the tapered conical surface ensures that the silicone tube is evenly pressurized, forming a complete sealing ring. This effectively solves the problem of easy leakage at the silicone tube connection under vacuum conditions, ensuring the stability of the vacuum level inside the stirring tank 11 during the addition of catalysts and initiators.

[0055] Please see Figure 1 and Figure 2 This application further proposes a stirrer 12, which includes a motor 121, a reducer 122, a stirring blade 123 and a stirring shaft 124. The motor 121 is connected to the reducer 122 in a transmission connection. The end of the reducer 122 away from the motor 121 is connected to the stirring shaft 124. The end of the stirring shaft 124 away from the reducer 122 extends into the stirring tank 11 and is connected to the stirring blade 123.

[0056] In this embodiment, motor 121 refers to the power source that drives the stirring shaft 124 to rotate, and can be implemented using a three-phase asynchronous motor to provide initial kinetic energy for the stirring action. Reducer 122 refers to the speed-changing device that adjusts the output speed of motor 121, and can be implemented using a planetary gear reducer. By reducing the speed, torque is increased to meet the stirring requirements of high-viscosity slurries. Stirring shaft 124 refers to the rigid transmission component connecting reducer 122 and stirring blade 123, and can be implemented using a hollow shaft made of stainless steel, ensuring structural strength while reducing overall weight. Stirring blade 123 refers to the mixing component that directly contacts the slurry.

[0057] Specifically, the output shaft of motor 121 is rigidly connected to the input end of reducer 122 via a coupling. The output end of reducer 122 is fixed to the top of stirring shaft 124 via a flange. The bottom of stirring shaft 124 extends into the inner cavity of stirring tank 11 and is bolted to stirring blade 123. When motor 121 starts, power is transmitted to stirring shaft 124 after being reduced in speed and increased in torque by reducer 122, driving stirring blade 123 to rotate around the axis. The intervention of reducer 122 controls the speed of stirring blade 123 within a suitable range for the viscosity of ceramic slurry, avoiding slurry splashing due to excessive speed. The full-length design of stirring shaft 124 ensures that stirring blade 123 can cover the effective mixing area of ​​flat-bottomed inner tank 111, eliminating blind spots in mixing.

[0058] This solution eliminates energy loss in intermediate transmission links through a rigid direct connection structure between the motor 121, reducer 122, and stirring shaft 124, achieving a high degree of integration of the power transmission system and solving the vibration and energy loss problems caused by the dispersed transmission components in traditional equipment. The precise speed regulation function of the reducer 122 enables the stirring process to adapt to the process requirements of different formulas, reducing the frequency of manual adjustments during production.

[0059] Please see Figure 1 , Figure 2 and Figure 4 This application further proposes a mechanical seal structure 14 between the stirring shaft 124 and the stirring tank 11. The mechanical seal structure 14 includes a flange 141, a stationary ring 142, a rotating ring 143, a spring 144, a spring seat 145, and a sealing ring assembly. The flange 141 is bolted to the tank cover 113 of the stirring tank 11. The stationary ring 142 is fixedly mounted on the flange 141. The rotating ring 143 is sleeved on the stirring shaft 124 and rotates synchronously with it. The end face of the rotating ring 143 and the end face of the stationary ring 142 fit together to form an axial sealing pair. The spring seat 145 is sleeved on the stirring shaft 124 and rotates synchronously with it; the two ends of the spring 144 are respectively connected to the back (the side of the non-sealing end face) of the spring seat 145 and the moving ring 143, and are used to provide axial clamping force to the moving ring 143 so that it keeps in close contact with the stationary ring 142; the sealing ring assembly includes a moving ring O-ring 146 disposed in the inner ring of the moving ring 143, a stationary ring O-ring 147 disposed between the stationary ring 142 and the flange 141, and a spring seat O-ring 148 disposed between the spring seat 145 and the stirring shaft 124.

[0060] In this embodiment, the mechanical seal structure 14 is used to seal the dynamic gap between the tank cover 113 of the mixing tank 11 and the rotating mixing shaft 124, preventing leakage of ceramic slurry and air during the mixing process. The flange 141 is circumferentially and evenly fixed to the equipment flange (static pressure ring) of the tank cover 113 of the mixing tank 11 using hexagonal bolts. The flange 141 has a specially machined mounting groove for installing the stationary ring 142, used to position and install the stationary ring 142. The stationary ring 142 is made of reaction-sintered silicon carbide material (suitable for ceramic slurries containing abrasive particles) and is press-fitted into the mounting groove of the flange 141 via an interference fit. A stationary ring O-ring 147 (made of fluororubber) is placed between the stationary ring 142 and the bottom of the flange 141 groove, forming the first static sealing barrier. The end face of the stationary ring 142 is diamond-ground to achieve a mirror finish. The rotating ring 143 is made of hard alloy material and is circumferentially fixed to the mixing shaft 124 via a keyway. The end face of the rotating ring 143 precisely matches the end face of the stationary ring 142, forming a liquid film seal under the pressure of the spring 144. The inner ring of the rotating ring 143 is fitted with a rotating ring O-ring 146 (made of PTFE-coated rubber), ensuring both sealing and allowing for slight axial movement and compensation. The spring 144 uses multiple Hastelloy helical springs (resistant to slurry corrosion). One end of the spring 144 is connected to the back of the rotating ring 143, and the other end is connected to the spring seat 145, providing stable axial clamping force to ensure that the sealing surfaces remain in contact even when the slurry viscosity fluctuates. The rotating ring O-ring 146 employs a double-lip structure to effectively prevent slurry particles from intruding into the bushing clearance; the stationary ring O-ring 147 uses a rectangular cross-section sealing ring to improve its resistance to compression. The spring seat 145 and the stirring shaft 124 are provided with a spring seat O-ring 148 (made of fluororubber) to form a static seal, which blocks the tiny gap between the spring seat 145 and the outer surface of the stirring shaft 124, forming a barrier to prevent the medium (liquid or gas) inside the equipment from leaking into the external environment through this gap, while helping the spring seat 145 to maintain a relatively stable position on the shaft.

[0061] When the stirring shaft 124 rotates, the moving ring 143 rotates synchronously with the stirring shaft 124, and the stationary ring 142 is fixed to the lid 113 of the stationary stirring tank 11 through the flange 141; the spring 144 pushes the end face of the moving ring 143 and the stationary ring 142 to form a dynamic sealing interface; the high-viscosity ceramic slurry forms a micron-level fluid film at the sealing interface to achieve zero-leakage sealing; the triple O-ring sealing system prevents the slurry from penetrating along the axial and radial leakage paths.

[0062] This solution utilizes the rigid contact seal between the moving ring 143 and the stationary ring 142 to effectively prevent air infiltration during vacuum mixing, maintaining a stable vacuum level inside the mixing tank 11 and preventing a decrease in the vacuum defoaming effect of the slurry due to seal failure. Simultaneously, it reduces the frequency of equipment maintenance caused by seal wear, ensuring the stability of the continuous production process.

[0063] Please see Figure 1 and Figure 2 This application further proposes that the stirring blade 123 is a single-layer, double-layer, or multi-layer cross-shaped blade.

[0064] In this embodiment, the cross-shaped blade refers to the stirring blade 123 with a symmetrical cross-shaped structure. Specifically, it can be achieved by welding four rectangular blades orthogonally to the end of the stirring shaft 124. Its symmetrical structure generates radial and axial flow shear forces simultaneously during rotation. A single-layer structure refers to having only one layer of cross-shaped blades arranged along the axial direction of the stirring shaft 124. Specifically, it can be achieved by installing a single blade group at the lower end of the stirring shaft 124, suitable for rapid mixing of shallow slurries. A double-layer or multi-layer structure refers to having two or more sets of cross-shaped blades spaced apart along the axial direction of the stirring shaft 124. Specifically, it can be achieved by installing upper and lower sets of blades at a preset interval, enhancing the longitudinal mixing effect by forming a multi-stage circulating flow field.

[0065] Specifically, the symmetrical structure of the cross-shaped blades, when rotating, causes all four blades to simultaneously propel the slurry, generating radial centrifugal motion and axial convection. Single-layer blades create horizontal vortices in shallow slurry; double-layer blades, through the downward pressure of the upper blade and the upward thrust of the lower blade, form a closed-loop flow, promoting longitudinal component migration; multi-layer blades, through staged shearing, repeatedly stretch and fold the high-viscosity slurry in a multi-stage flow field, achieving deep homogenization. The radial centrifugal motion and axial convection generated by the rotating cross-shaped blades promote the rise of air bubbles at the bottom of the slurry to the surface for dissolution, resulting in better vacuum degassing. During the vacuum isobaric stirring stage with added catalysts and initiators, the added catalysts and initiators can be rapidly dispersed, preventing premature solidification due to excessively high local concentrations of catalysts and initiators.

[0066] In some specific implementations, the upper and lower layers of the double-layered cross-shaped blades can be set to different sizes to optimize the flow field uniformity through differentiated shear force distribution.

[0067] This solution utilizes the multi-directional shearing action of the cross-shaped blades and the expandable hierarchical design to create a composite flow field in three-dimensional space for the slurry. This enables more effective vacuum degassing of the slurry and rapid dispersion and uniform distribution of the added catalysts and initiators, avoiding premature curing of the slurry due to excessively high local concentrations of catalysts and initiators.

[0068] Please see Figure 1 and Figure 2 This application further proposes that the jacket 11a is provided with an inlet 11b and an outlet 11c connected to the cooling circulation machine 21. The inlet 11b and the outlet 11c are used to allow the cooling medium to flow so as to cool the slurry in the flat-bottomed inner barrel 111.

[0069] In this embodiment, the cooling circulation machine 21 refers to a temperature control device with a medium cooling circulation function, which can be implemented using a compressor refrigeration system. A constant temperature output of the cooling medium is achieved by setting a temperature threshold. The jacket 11a refers to a closed cavity structure that wraps around the outer wall of the flat-bottomed inner barrel 111, forming a three-dimensional heat exchange space surrounding the flat-bottomed inner barrel 111. The inlet 11b and outlet 11c refer to pipe interfaces located at both ends of the jacket 11a for medium circulation. These can be connected to the cooling circulation machine 21 via flanges to form a closed circulation loop.

[0070] Specifically, the cooling circulator 21 is configured as an independent temperature control unit, continuously supplying low-temperature cooling medium to the jacket 11a through the inlet 11b. As the cooling medium flows along the inner cavity of the jacket 11a, it exchanges heat with the outer wall of the flat-bottomed inner barrel 111, absorbing heat from the slurry. The medium, having completed heat exchange, returns to the cooler through the outlet 11c for further cooling, forming a continuous cooling path. The jacket 11a structure, through its design that maximizes the contact area surrounding the flat-bottomed inner barrel 111, effectively improves the heat transfer efficiency of the cooling medium. The symmetrical layout of the inlet 11b and outlet 11c creates a forced convection circulation mode, preventing localized temperature accumulation caused by medium stagnation.

[0071] This solution directly connects the cooling circulator 21 to the jacket 11a of the mixing tank 11, constructing a closed-loop circulation system to optimize and shorten the heat transfer path. Furthermore, this solution significantly improves heat exchange efficiency through a forced circulation mode. The integrated cooling system design simplifies the equipment layout and meets the stringent temperature stability requirements of continuous production processes.

[0072] Please see Figure 1 and Figure 2 This application further proposes that the temperature sensor 22 of the ceramic slurry preparation equipment for gel injection molding includes a temperature sensor sleeve 221 welded to the lid 113 of the mixing tank 11 and a digital display thermocouple 222. The temperature sensor sleeve 221 extends vertically into the flat-bottomed inner tank 111, and the digital display thermocouple 222 is fixed in the temperature sensor sleeve 221 for real-time measurement of the slurry temperature in the flat-bottomed inner tank 111.

[0073] In this embodiment, the temperature sensor sleeve 221 is a seamless U-shaped tube of 304 stainless steel with a closed lower end and an open upper end with internal threads. The upper opening is seamlessly welded to a through hole on the bucket lid 113 via argon arc welding. When the bucket lid 113 is closed, the lower end of the temperature sensor sleeve 221 can be inserted into the slurry and directly contact the slurry. The digital display thermocouple 222 adopts a T-shaped armored structure. The probe end extends into the temperature sensor sleeve 221 and contacts its lower end. The upper end of the digital display thermocouple 222 is fixed to the temperature sensor sleeve 221 by threads to ensure accurate measurement of the slurry temperature.

[0074] The temperature sensor sheath 221 protects the probe of the digital display thermocouple 222 from direct contact with the alkaline slurry, preventing corrosion. The probe, with its temperature sensor sheath 221, is directly inserted into the slurry, providing real-time, accurate temperature feedback. This facilitates closed-loop control of cooling water flow and temperature within ±1℃ accuracy. Specifically, when the digital display thermocouple 222 detects that the slurry temperature exceeds a set threshold, the system immediately activates cooling water circulation to suppress the temperature rise.

[0075] For example: using acrylamide as a monomer, N,N-methylenebisacrylamide as a crosslinking agent, tetramethylethylenediamine as a catalyst, and ammonium persulfate as an initiator, the SiC ceramic slurry prepared by traditional methods is gel-cast and cured into a green body, as shown in the example. Figure 3 In example A, the SiC ceramic slurry prepared using the same formula and gel-molded using the ceramic slurry preparation equipment described in the above embodiments, after gel-molding and curing, results in a green body. Figure 3 B in the comparison. Figure 3 As can be seen from A and B, the green body of SiC ceramic slurry prepared by traditional methods after gel casting and curing has a large number of pores. However, the green body of SiC ceramic slurry prepared by the gel casting ceramic slurry preparation equipment of the present invention has significantly fewer bubbles after gel casting and curing, and the quality of the green body formed by gel casting is significantly improved.

[0076] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A ceramic slurry preparation device for gel casting, characterized in that, The gel-molding ceramic slurry preparation device comprises: a vacuum stirring assembly comprising a stirring barrel, a stirrer and a vacuum pump, one end of the stirrer extending into the stirring barrel, the vacuum pump being in communication with the stirring barrel, the stirrer being used for stirring the slurry in the stirring barrel, and the vacuum pump being used for vacuumizing the stirring barrel during stirring; a temperature control assembly comprising a cooling circulator and a temperature sensor, the cooling circulator being in communication with the stirring barrel for cooling the slurry in the stirring barrel, and the temperature sensor being used for measuring the temperature of the slurry in the stirring barrel in real time; and a vacuum feeding assembly comprising a peristaltic pump and a sealed container, the liquid inlet end of the peristaltic pump being in communication with the sealed container, the liquid outlet end of the peristaltic pump being in communication with the stirring barrel, and the sealed container being in communication with the stirring barrel for realizing precise addition of catalyst and initiator to the stirring barrel under vacuum isobaric environment. The stirring barrel comprises: a flat-bottom inner barrel for containing the slurry; an outer barrel body, the flat-bottom inner barrel being contained in the outer barrel body and forming a jacket between the flat-bottom inner barrel and the outer barrel body, the jacket being in communication with the cooling circulator for flowing cooling medium; and a barrel cover provided with a vacuum hole, a peristaltic pump hose inlet, a constant pressure hole, an exhaust hole and a vacuum gauge, the vacuum pump being in communication with the flat-bottom inner barrel through the vacuum hole, the liquid outlet end of the peristaltic pump being in communication with the flat-bottom inner barrel through the peristaltic pump hose inlet, the sealed container being in communication with the flat-bottom inner barrel through the constant pressure hole, the exhaust hole being used for realizing pressure balance between the flat-bottom inner barrel and the environment, and the vacuum gauge being installed on the barrel cover for displaying the vacuum degree of the flat-bottom inner barrel in real time. A vacuum pump gas-water separator is arranged between the vacuum pump and the flat-bottom inner barrel, and is used for measuring the loss amount of water in the ceramic slurry preparation device during vacuumization.

2. The ceramic slurry preparation apparatus for gelcasting according to claim 1, wherein Ball valves are installed on the vacuum hole, the peristaltic pump hose inlet, the constant pressure hole and the exhaust hole of the barrel cover.

3. The ceramic slurry preparation apparatus for gelcasting according to claim 1, wherein The peristaltic pump hose inlet is a tapered conical structure, the hose of the liquid outlet end of the peristaltic pump is provided with a conical surface, and is coupled and inserted into the peristaltic pump hose inlet through the conical surface, so as to connect the liquid outlet end of the peristaltic pump with the flat-bottom inner barrel.

4. The ceramic slurry preparation apparatus for gelcasting according to claim 1, wherein The stirrer comprises a motor, a speed reducer, stirring blades and a stirring shaft, the motor being in transmission connection with the speed reducer, one end of the speed reducer away from the motor being connected with the stirring shaft, and one end of the stirring shaft away from the speed reducer extending into the stirring barrel and being connected with the stirring blades.

5. The ceramic slurry preparation apparatus for gelcasting according to claim 4, wherein The mechanical seal structure is arranged between the stirring shaft and the stirring barrel, and comprises a flange, a static ring, a dynamic ring, a spring, a spring seat and a sealing ring assembly; the flange is fixedly installed on the barrel cover of the stirring barrel by bolts; the static ring is fixedly installed on the flange; the dynamic ring is sleeved on the stirring shaft and rotates synchronously with the stirring shaft, the end faces of the dynamic ring and the static ring are in close contact to form an axial sealing pair; the spring seat is sleeved on the stirring shaft and rotates synchronously with the stirring shaft; the two ends of the spring are connected with the spring seat and the back of the dynamic ring respectively, and the spring is used for providing an axial compression force to the dynamic ring to keep the dynamic ring in close contact with the static ring; the sealing ring assembly comprises a dynamic ring O-shaped ring arranged in the inner ring of the dynamic ring, a static ring O-shaped ring arranged between the static ring and the flange, and a spring seat O-shaped ring arranged between the stirring shaft and the spring seat.

6. The ceramic slurry preparation apparatus for gelcasting according to claim 4, wherein The stirring blade is a single-layer, double-layer or multi-layer cross-pulp type blade.

7. The ceramic slurry preparation apparatus for gelcasting according to claim 1, wherein The jacket is provided with a water inlet and a water outlet which are communicated with the cooling circulating machine, and the water inlet and the water outlet are used for flowing of the cooling medium to cool the pulp in the flat-bottomed inner barrel.

8. The ceramic slurry preparation apparatus for gelcasting according to claim 1, wherein The temperature sensor comprises a temperature sensor sleeve welded on the barrel cover of the stirring barrel and a digital display thermocouple fixed in the temperature sensor sleeve, and the temperature sensor sleeve vertically extends into the flat-bottomed inner barrel, and the digital display thermocouple is used for instant measurement of the pulp temperature in the flat-bottomed inner barrel.

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