Ceramic slurry preparation equipment for gel casting

Abstract

The invention discloses 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 communicating with the stirring barrel; the stirrer extends into the stirring barrel to stir slurry in the stirring barrel; the temperature control assembly comprises a cooling circulator communicated with the stirring barrel and a temperature sensor, the cooling circulator is used for cooling slurry in the stirring barrel, and the temperature sensor is used for measuring the temperature of the slurry in the stirring barrel; the vacuum feeding assembly comprises a peristaltic pump and a closed container communicated with the stirring barrel, the closed container and the stirring barrel are communicated with the peristaltic pump, and the vacuum feeding assembly is used for accurately adding a catalyst and an initiator into the stirring barrel in a vacuum isobaric environment. According to the invention, full automation of preparation of the ceramic slurry for gel casting is realized in the same equipment, and bubbles generated in the preparation process of the ceramic slurry are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of preparation equipment, in particular to a ceramic slurry preparation device for gel injection molding. Background Art

[0002] In the existing technology for preparing ceramic slurries for gel casting molding, the process involving vacuum degassing, cooling, and the addition of catalysts and initiators is usually carried out step by step using separate independent equipment. This decentralized operation mode leads to a significant lack of automation and integration in the entire process flow. Specifically, frequent material transfer, equipment switching and manual intervention are required between each process, and the operation process is extremely cumbersome. This not only results in low production efficiency, but also relies heavily on a large number of operators for manual control and coordination. The above-mentioned defects make it difficult for the existing process to meet the needs of large-scale, continuous batch production, and have become a key bottleneck restricting the industrial development and efficiency improvement of related products. Therefore, there is an urgent need for a highly integrated and automated innovative solution.

[0003] Furthermore, in existing gel-casting ceramic slurry preparation technology, the process of vacuum degassing the slurry followed by the addition of catalysts and initiators is typically performed in air. This process can easily introduce air bubbles into the degassing slurry, leading to defects such as pores within the cured ceramic body. For gel-casting ceramic slurries based on 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 barrier effects occur during curing. This can lead to defects such as pores and scaling after curing. These defects can severely degrade the performance of the gel-casted ceramic after sintering, and can even cause sintering fractures. Therefore, how to avoid the introduction of air during the preparation of ceramic slurry for gel casting molding is a difficulty that urgently needs to be solved in the preparation of ceramic slurry for gel casting molding. Summary of the Invention

[0004] The main purpose of the present invention is to propose a ceramic slurry preparation device for gel casting molding, which aims to integrate the functions of vacuum degassing, cooling and adding reaction agents under a vacuum environment in the same device, realize the automation of the preparation of ceramic slurry for gel casting molding, simplify the operation, improve the preparation efficiency, and at the same time minimize the introduction of air during the preparation process of ceramic slurry for gel casting molding, thereby reducing the formation of defects such as pores after the slurry is cured.

[0005] To achieve the above-mentioned object, the present invention provides a ceramic slurry preparation device for gel casting, wherein the ceramic slurry preparation device for gel casting comprises: A vacuum stirring assembly, comprising a stirring barrel, an agitator, and a vacuum pump. One end of the agitator extends into the stirring barrel, and the vacuum pump is connected to the stirring barrel. The agitator is used to stir the slurry in the stirring barrel, and the vacuum pump is used to evacuate the stirring barrel during the stirring process. a temperature control assembly, the temperature control assembly comprising a cooling circulator and a temperature sensor, the cooling circulator being in communication with the mixing barrel and configured to cool the slurry in the mixing barrel, and the temperature sensor being configured to instantly measure the temperature of the slurry in the mixing barrel; And a vacuum feeding component, which includes a peristaltic pump and a closed container. The liquid inlet end of the peristaltic pump is connected to the closed container, the liquid outlet end of the peristaltic pump is connected to the stirring barrel, and the closed container is connected to the stirring barrel, which is used to achieve precise addition of catalyst and initiator to the stirring barrel under a vacuum and isobaric environment.

[0006] In one embodiment, the mixing tank comprises: a flat-bottom inner barrel, wherein the flat-bottom inner barrel is used to contain slurry; An outer barrel body, wherein the flat bottom inner barrel is accommodated in the outer barrel body and a jacket is formed between the outer barrel body and the flat bottom inner barrel, wherein the jacket is connected to the cooling cycle machine for flowing cooling medium; and a barrel cover, the barrel cover is provided with a vacuum hole, a peristaltic pump hose inlet, a constant pressure hole, an exhaust hole and a vacuum gauge, the vacuum pump is connected with the flat-bottom inner barrel through the vacuum hole, the liquid outlet of the peristaltic pump is connected with the flat-bottom inner barrel through the peristaltic pump hose inlet, the closed container is connected with the flat-bottom inner barrel through the constant pressure hole, the exhaust hole is used to achieve the balance of the flat-bottom inner barrel and the ambient air pressure, and the vacuum gauge is installed on the barrel cover through a threaded through hole to display the vacuum degree of the flat-bottom inner barrel in real time.

[0007] In one embodiment, ball valves are installed on the vacuum hole, peristaltic pump hose inlet, constant pressure hole, and exhaust hole on the barrel cover.

[0008] In one embodiment, a vacuum pump gas-water separator is provided between the vacuum pump and the flat-bottom inner barrel, and 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.

[0009] In one embodiment, the peristaltic pump hose inlet is a tapered conical structure, the hose at the peristaltic pump outlet is set as a conical surface, and is inserted into the peristaltic pump hose inlet through conical surface coupling to connect the peristaltic pump outlet with the flat-bottom inner barrel.

[0010] In one embodiment, the agitator includes a motor, a reducer, a stirring blade and a stirring shaft. The motor is connected to the reducer in a transmission manner, and the end of the reducer away from the motor is connected to the stirring shaft. The end of the stirring shaft away from the reducer extends into the stirring barrel and is connected to the stirring blade.

[0011] In one embodiment, a mechanical sealing structure is provided between the stirring shaft and the stirring barrel, and the mechanical sealing structure includes a flange, a static ring, a dynamic ring, a spring, a spring seat and a sealing ring assembly; the flange is fixedly mounted on the barrel cover of the stirring barrel by bolts; the static ring is fixedly mounted on the flange; the dynamic ring is sleeved on the stirring shaft and rotates synchronously with it, and the end face of the dynamic ring and the end face of the static ring fit together 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 spring seat and the back of the dynamic ring, for providing axial compression force to the dynamic ring so that it maintains close contact with the static ring; the sealing ring assembly includes a dynamic ring O-ring arranged on the inner ring of the dynamic ring, a static ring O-ring arranged between the static ring and the flange, and a spring seat O-ring arranged between the stirring shaft and the spring seat.

[0012] In one embodiment, the stirring blade is a single-layer, double-layer or multi-layer cross-paddle blade.

[0013] In one embodiment, the jacket is provided with a water inlet and a water outlet connected to the cooling circulation machine, and the water inlet and the water outlet are used for circulating a cooling medium to cool the slurry in the flat-bottom inner barrel.

[0014] In one embodiment, the temperature sensor includes a temperature sensor sleeve and a digital thermocouple welded to the barrel cover of the mixing barrel, the temperature sensor sleeve extends vertically into the flat-bottom inner barrel, and the digital thermocouple is fixed in the temperature sensor sleeve for real-time measurement of the slurry temperature in the flat-bottom inner barrel.

[0015] The present invention discloses a ceramic slurry preparation apparatus for gel casting, comprising a vacuum stirring assembly, a temperature control assembly, and a vacuum feeding assembly. The vacuum stirring assembly includes a stirring barrel, an agitator, and a vacuum pump. One end of the agitator extends into the stirring barrel, and the vacuum pump is connected to the stirring barrel. The temperature control assembly includes a cooling circulator and a temperature sensor. The cooling circulator is connected to the stirring barrel and is used to cool the slurry in the stirring barrel. The temperature sensor is used to measure the slurry temperature in the stirring barrel in real time. The vacuum feeding assembly includes a peristaltic pump and a sealed container. The peristaltic pump's liquid inlet is connected to the sealed container, and the peristaltic pump's liquid outlet is connected to the stirring barrel. The sealed container is connected to the stirring barrel and is used to precisely add catalyst and initiator to the stirring barrel under a vacuum and isobaric environment. Through the physical integration of functional modules, vacuum degassing, temperature control, and the addition of catalysts and initiators in a vacuum environment are simultaneously completed within a single container, eliminating the time and material loss caused by equipment switching. Process parameters can be centrally controlled, and operators only need to set a program to complete fully automated production processes, thus achieving automation, simplifying operations, and improving production efficiency. The preparation of ceramic slurries for gel casting is completed in a vacuum environment, avoiding the reintroduction of air and bubbles during the stirring of the slurry in air and the addition of catalysts and initiators, which can lead to defects such as pores in the cured ceramic body. Furthermore, this method effectively avoids defects caused by oxygen barrier defects during the curing of AM / MBAM, MAM / MBAM, DMAA / MBAM, and HEMA / MBAM gel casting slurries due to the presence of oxygen in the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of a ceramic slurry preparation device for gel casting provided by the present invention; Figure 2 A schematic structural diagram of a barrel cover of a mixing barrel of a gel casting molding ceramic slurry preparation device provided by the present invention; Figure 3 The SiC ceramic green body (B) is gel-molded using the ceramic slurry preparation equipment for gel-molding of the present invention and the SiC ceramic green body (A) is gel-molded using the traditional method with the same formula; Figure 4This is a schematic structural diagram of the mechanical seal structure of the ceramic slurry preparation equipment for gel casting provided by the present invention.

[0018] Description of Figure Numbers: 10. Vacuum stirring assembly; 11. Mixing barrel; 111. Flat-bottom inner barrel; 112. Outer barrel; 11a. Jacket; 11b. Water inlet; 11c. Water outlet; 113. Barrel cover; 113a. Vacuum hole; 113b. Peristaltic pump hose inlet; 113c. Constant pressure hole; 113d. Exhaust hole; 113e. Vacuum gauge; 12. Agitator; 121. Motor; 122. Reducer; 123. Stirring blade; 124. Stirring shaft; 13. Vacuum pump; 14. Mechanical seal structure; 141. Flange; 142. Stationary ring; 143. Dynamic ring; 144. Spring; 145. Spring seat; 146. Dynamic 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 thermocouple; 30. Vacuum feeding assembly; 31. Peristaltic pump; 32. Sealed container; 40. Vacuum pump air-water separator.

[0019] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] In the existing technology for preparing ceramic slurries for gel casting molding, the process involves vacuum degassing, cooling, and precise dripping of catalysts and initiators, which are usually carried out step by step using separate independent equipment. This decentralized operation mode requires frequent material transfer, equipment switching, and manual intervention for the entire process. The operation process is extremely cumbersome and difficult to meet the needs of large-scale, continuous batch production. For example, in the process of preparing ceramic slurries, the operator needs to first complete the mixing in a stirring device, then transfer it to a vacuum device for degassing, then connect it to a cooling system to control the temperature, and finally add the catalyst and initiator through a peristaltic pump or a handheld burette while stirring. The whole process has the problems of low efficiency and poor process stability. In addition, after the slurry is vacuum defoamed and cooled, the process of adding the catalyst and initiator dropwise into the slurry is usually carried out during air stirring. The slurry after vacuum defoaming is easily prone to generate bubbles due to the reintroduction of air during stirring in the air, which leads to defects such as pores inside the ceramic body after solidification. For the gel injection molding ceramic slurry of AM / MBAM system, MAM / MBAM system, DMAA / MBAM system and HEMA / MBAM system, defects may also be formed during the solidification molding due to the oxygen barrier effect caused by the oxygen contained in the air in the slurry.

[0024] In order to solve the above problems, the inventors observed that the functional separation of equipment in the traditional process is the core reason for low efficiency. Through analysis, it was found that the vacuum degassing, mechanical stirring and temperature control of the slurry can be integrated together, avoiding material transfer, equipment switching and manual intervention in the process flow, realizing the simplification and automation of the process flow, and meeting the needs of large-scale, continuous batch production. Further research found that the stirring and dripping of catalysts and initiators in the slurry under air environment is the main reason for the reintroduction of air into the slurry to generate bubbles, resulting in the formation of pores and oxygen resistance defects in the blank after the slurry is solidified. Through further analysis, it was found that when the slurry is stirred in vacuum, the catalyst and initiator can be added stably and accurately in a quantitative manner under a vacuum isobaric environment through a peristaltic pump, thereby effectively avoiding the reintroduction of air and the generation of bubbles when the slurry is stirred in the air and the catalyst and initiator are added. Based on these findings, the technical concept of integrating vacuum stirring, circulating cooling and vacuum isobaric quantitative injection of a peristaltic pump into a single device was finally formed.

[0025] Therefore, see Figure 1 and Figure 2 The present application proposes a ceramic slurry preparation device for gel injection molding, which includes a vacuum stirring component 10, a temperature control component 20 and a vacuum feeding component 30. The vacuum stirring component 10 includes a stirring barrel 11, an agitator 12 and a vacuum pump 13. One end of the agitator 12 extends into the stirring barrel 11, and the vacuum pump 13 is connected to the stirring barrel 11. The temperature control component 20 includes a cooling circulator 21 and a temperature sensor 22. The cooling circulator 21 is connected to the stirring barrel 11. The vacuum feeding component 30 includes a peristaltic pump 31 and a sealed container 32. The liquid inlet end of the peristaltic pump 31 is connected to the sealed container 32, and the liquid outlet end is connected to the stirring barrel 11. The sealed container 32 is connected to the stirring barrel 11. The sealed container 32 is mainly used to contain solutions such as catalysts and initiators.

[0026] In this embodiment, the vacuum stirring assembly 10 refers to a device that achieves simultaneous stirring and vacuuming by synergizing mechanical stirring with a vacuum environment. The temperature control assembly 20 refers to a device that controls the temperature of the slurry by circulating a heat exchange medium, and monitors and maintains the temperature stability of the slurry in real time during the dynamic process through a temperature sensor 22. The vacuum feeding assembly 30 refers to a device that achieves quantitative delivery in a vacuum isobaric environment by squeezing the flexible tube of a peristaltic pump 31. Specifically, this can be achieved by using a stepper motor to drive a roller to compress a silicone tube, ensuring the metering accuracy of liquid addition in a vacuum isobaric environment.

[0027] Specifically, the agitator 12 stirs the slurry in the vacuum environment established by the vacuum pump 13, and performs vacuum debubbling during stirring. Compared with vacuum debubbling, vacuum stirring debubbling can remove bubbles in the slurry more thoroughly. The cooling medium circulates continuously in the stirring barrel 11, and the temperature of the slurry in the stirring barrel 11 is regulated by heat conduction. By regulating the temperature of the slurry, the solidification rate of the slurry can be regulated to avoid premature solidification of the slurry. The peristaltic pump 31 injects the catalyst and initiator solutions into the stirring barrel 11 in a quantitative manner under vacuum isobaric conditions through periodic compression of the elastic pipe. The delivery volume can be accurately controlled by the speed of the motor in the peristaltic pump 31. The three are spatially integrated into the same operating unit.

[0028] Compared with the existing technology, the traditional process requires the use of three types of equipment, namely a mixer, a vacuum tank and a cooling tank, in sequence. Each process requires re-clamping of materials and adjustment of process parameters. This solution, through the physical integration of functional modules, enables vacuum degassing, temperature control and vacuum isobaric addition of catalysts and initiators to be completed in a single container, eliminating the inconvenience and human error caused by equipment switching. The process parameters can be centrally controlled, and the operator only needs to set the program to complete the fully automated process production, thereby achieving automation, simplifying the operation and improving the preparation efficiency. At the same time, the preparation of ceramic slurry for gel injection molding is completed in a vacuum environment, avoiding the reintroduction of air and the generation of bubbles during the process of stirring the slurry in the air and adding the catalyst and initiator, which leads to defects such as pores in the ceramic body after solidification. In addition, it can effectively avoid the defects caused by oxygen resistance caused by the oxygen contained in the air during the solidification of the gel injection molding ceramic slurry of AM / MBAM system, MAM / MBAM system, DMAA / MBAM system and HEMA / MBAM system.

[0029] See also Figure 1 and Figure 2 The present application further proposes that the mixing barrel 11 includes a flat-bottomed inner barrel 111 , an outer barrel body 112 and a barrel cover 113 . The flat-bottomed inner barrel 111 is used to contain slurry; the outer barrel body 112 contains the flat-bottomed inner barrel 111 therein, and forms a jacket 11a between the outer barrel body 112 and the flat-bottomed inner barrel 111. The jacket 11a is connected to the cooling circulator 21 for flowing cooling medium; the barrel 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 barrel 111 through the vacuum hole 113a, the liquid outlet end of the peristaltic pump 31 is connected to the flat-bottomed inner barrel 111 through the peristaltic pump hose inlet 113b, the sealed container 32 is connected to the flat-bottomed inner barrel 111 through the constant pressure hole 113c, the exhaust hole 113d is used to achieve pressure balance between the flat-bottomed inner barrel 111 and the ambient air, and the vacuum gauge 113e is installed and fixed on the barrel cover 113 through a threaded through hole for real-time display of the vacuum degree of the flat-bottomed inner barrel 111.

[0030] In this embodiment, the flat-bottomed inner barrel 111 is a container with a flat bottom that can withstand a pressure differential greater than one atmosphere. Specifically, it can be made of stainless steel. The flat bottom structure facilitates a uniform flow of the slurry during stirring. The outer barrel body 112 is a shell that fits over the outer surface of the flat-bottomed inner barrel 111. Specifically, it can be made of a single layer of stainless steel. The jacket 11a formed by the outer barrel body 112 and the flat-bottomed inner barrel 111 serves as a cooling medium circulation 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 body 112, forming a circulation path for the cooling medium. The barrel cover 113 refers to the sealing cover covering the top of the flat-bottomed inner barrel 111, which can be fixed by a quick-release bolt locking buckle. The vacuum hole 113a, the peristaltic pump hose inlet 113b, the constant pressure hole 113c, the exhaust hole 113d and the vacuum gauge 113e are evenly distributed at equal angles along the circumference of the barrel cover 113 to optimize the sealing performance. The vacuum hole 113a refers to a circular through hole that passes through the barrel cover 113, which can be implemented by an embedded stainless steel liner to establish a direct air connection between the vacuum pump 13 and the flat-bottomed inner barrel 111. The peristaltic pump hose inlet 113b refers to a tubular interface with a conical guide structure, which can be implemented by stainless steel. The liquid outlet hose of the peristaltic pump 31 is pressed against the peristaltic pump hose inlet 113b through the conical surface to form an airtight connection. The constant pressure hole 113c is a tubular interface with external threads, specifically implemented using a quick-connect clamp. It is used to connect the sealed container 32 and the flat-bottomed inner barrel 111 and achieve pressure balance within the sealed container 32 and the flat-bottomed inner barrel 111. The exhaust hole 113d is a channel structure that connects the interior of the flat-bottomed inner barrel 111 with the external environment. It is used to achieve air pressure balance between the flat-bottomed inner barrel 111 and the external environment after the ceramic slurry for gel casting is prepared in a vacuum environment, so that the lid 113 can be opened for pouring and injection molding. The vacuum gauge 113e is an instrument mounted on the threaded barrel hole of the lid 113 to measure the gas pressure inside the sealed container 32. It is used to display the vacuum level of the flat-bottomed inner barrel 111 in real time during the preparation of the ceramic slurry for gel casting. It can monitor the airtightness of the equipment during the slurry preparation process, that is, whether there is any gas leakage in the equipment.

[0031] 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 for thorough mixing of materials in a vacuum environment. The jacket 11a structure formed by the outer barrel 112 and the flat-bottomed inner barrel 111 circulates a cooling medium to continuously dissipate heat generated by the slurry itself and by stirring. This, combined with the temperature control assembly 20, precisely regulates the slurry temperature, preventing excessively low temperatures from increasing viscosity and affecting slurry stability, and excessively high temperatures from causing premature solidification and resulting in injection molding failure. The barrel cover 113 has an integrated vacuum hole 113a that directly connects the vacuum pump 13 and the flat-bottom inner barrel 111, and eliminates bubbles by rapid vacuuming and stirring; the peristaltic pump hose inlet 113b adopts a tapered cone structure to maintain the sealing of the hose and the interface under vacuum negative pressure environment; the constant pressure hole 113c connects the sealed container 32 and the flat-bottom inner barrel 111 through an air pipe, and through the pressure balance principle, the catalyst and initiator are stably and accurately injected into the flat-bottom inner barrel 111 through the peristaltic pump 31 under a pressure-free state, thereby realizing stable and accurate metered addition of the catalyst and initiator; the exhaust hole 113d is a channel connecting the flat-bottom inner barrel 111 and the atmospheric environment. After the ceramic slurry for gel injection molding is prepared, the air pressure balance between the flat-bottom inner barrel 111 and the atmospheric environment is achieved through the exhaust hole 113d, so as to facilitate opening the barrel cover 113 for pouring injection molding. Otherwise, it would be difficult to open the lid 113 for pouring and injection molding under atmospheric pressure differentials. A vacuum gauge 113e is mounted on the lid 113 via a threaded through-hole and is connected to the flat-bottomed inner barrel 111. This allows pressure changes within the flat-bottomed inner barrel 111 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, and its range can be set according to process requirements. The threaded through-hole refers to a through-hole with an internal thread structure formed on the surface of the lid 113. The threaded through-hole ensures a rigid connection between the vacuum gauge 113e and the lid 113. The vacuum degree of the flat-bottomed inner barrel 111 refers to the negative pressure state of the environment in which the slurry is located during mixing. This is specifically achieved through the suction action of the vacuum pump 13, and its value directly reflects the pressure changes in the slurry mixing environment. The various functional interfaces are centrally arranged on the lid 113, allowing the slurry vacuum mixing and degassing, slurry temperature control, and catalyst and initiator injection into the slurry to be simultaneously completed within a single device.

[0032] Compared with existing technologies, traditional processes require transferring the slurry between different equipment for degassing, cooling, and catalyst and initiator injection, resulting in complex operational processes and the risk of contamination. This solution, through the cooling jacket 11a and the integrated lid 113 design, integrates heat exchange, vacuum treatment, and vacuum isobaric material conveying within the same mixing barrel 11, eliminating material transfer steps. The nested structure of the flat-bottomed inner barrel 111 and outer barrel 112 improves cooling efficiency while maintaining a consistent footprint. The lid 113's integrated multi-port design reduces equipment switching and manual operation steps compared to separate piping connections. In particular, the vacuum feeding assembly 30 enables stable and precise addition of catalysts and initiators to ceramic slurries for gel casting even under vacuum. This allows for the preparation of ceramic slurries in a vacuum environment, effectively degassing the slurry while preventing the reintroduction of air, significantly improving the quality of the gel casting slurry. The temperature control assembly 20 provides instant feedback on the slurry temperature and enables precise temperature control. The design of the vacuum gauge 113e can monitor the dynamic changes in vacuum degree during the slurry preparation process in real time, ensuring that the equipment is airtight and leak-proof.

[0033] See also Figure 1 and Figure 2 , the present application further proposes that the vacuum hole 113a, the peristaltic pump hose inlet 113b, the constant pressure hole 113c and the exhaust hole 113d are all welded with ball valves.

[0034] In this embodiment, the ball valve refers to an opening and closing control component installed at the outlet of the vacuum hole 113a, the peristaltic pump hose inlet 113b, the constant pressure hole 113c and the exhaust hole 113d. Specifically, it can be implemented by a manual rotary stainless steel ball valve. By adjusting the valve core, the opening and closing of the vacuum hole 113a, the peristaltic pump hose inlet 113b, the constant pressure hole 113c and the exhaust hole 113d are controlled to realize the independent use of the vacuum hole 113a, the peristaltic pump hose inlet 113b, the constant pressure hole 113c and the exhaust hole 113d in time.

[0035] Specifically, during the vacuum stirring and cooling phase and the vacuum stirring and debubbling phase, 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 vent 113d need to be closed. After the vacuum stirring and debubbling phase, the vacuum isobaric stirring and catalyst and initiator addition phase is performed, during which 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 vent 113d needs to be closed. After the pressure in the flat-bottomed inner barrel 111 and the sealed container 32 are balanced, the peristaltic pump 31 can be started to add the catalyst and initiator. After the vacuum isobaric stirring and catalyst and initiator addition phase is completed, the pouring injection molding phase is performed, during which the vacuum port 113a, peristaltic pump hose inlet 113b, and constant pressure port 113c ball valves need to be closed, and the ball valve of vent 113d needs to be opened. Only after the pressure in the flat-bottomed inner barrel 111 is balanced with atmospheric pressure can the lid 113 be opened to proceed with pouring injection molding.

[0036] This solution can realize vacuum stirring cooling, vacuum stirring to remove bubbles, vacuum isobaric stirring to add catalyst and initiator and pouring gel injection molding process in sequence by opening and closing the ball valves at the vacuum hole 113a, the peristaltic pump hose inlet 113b, the constant pressure hole 113c and the exhaust hole 113d outlet. The operation is simple and convenient, ensuring that each process can be carried out independently and controllably.

[0037] See also Figure 1 and Figure 2 The present application further proposes to set a vacuum pump gas-water separator 40 between the vacuum pump 13 and the flat-bottom inner barrel 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.

[0038] In this embodiment, the vacuum pump gas-water separator 40 refers to a separation device installed between the vacuum pump 13 and the stirring container. Specifically, it can be implemented using a structure with a transparent scale container. By collecting the extracted gas-liquid mixture and separating the liquid water, the water loss is directly quantified using the scale. This device traps water in the container through physical separation, achieving direct measurement of the water loss. Among them, the flat-bottomed inner barrel 111 is connected to the vacuum pump gas-water separator 40 through the vacuum hole 113a, ensuring that the vacuum extraction path passes through the vacuum pump gas-water separator 40, thereby ensuring that all extracted water is captured and measured.

[0039] Specifically, when the vacuum pump 13 is operating, the water in the slurry is drawn into the vacuum pump gas-water separator 40 along with the gas. Within the vacuum pump gas-water separator 40, the gas-liquid mixture undergoes phase separation due to the reduced flow rate and structural design. Liquid water is trapped in the graduated container, while the gas continues to flow toward the vacuum pump 13 for discharge. By observing the amount of water accumulated in the graduated container, the real-time water loss in the slurry during the vacuuming process can be directly read and replenished in advance, achieving precise control of the slurry solids content and preventing the loss of water during the vacuuming process from causing the slurry solids content to continue to rise, thereby damaging the slurry's stability.

[0040] This solution directly captures and quantifies moisture through the vacuum pump's gas-water separator 40, shifting the data source from indirect inference to direct measurement. Through this technical solution, the present application achieves precise measurement of slurry moisture loss during vacuuming, avoiding imbalances in composition ratios caused by uncontrolled moisture loss, ensuring slurry viscosity stability and consistent molding quality, and providing reliable data support for automated, precise ratio adjustments.

[0041] See also Figure 1 and Figure 2 The present application further proposes that the peristaltic pump hose inlet 113b adopts a tapered conical structure, the hose at the liquid outlet end of the peristaltic pump 31 is set as a conical surface, and the peristaltic pump hose inlet 113b is inserted through the conical surface coupling to connect the liquid outlet end of the peristaltic pump 31 with the flat-bottom inner barrel 111.

[0042] In this embodiment, the tapered conical structure refers to a cross-sectional diameter of the inlet channel that gradually decreases along the insertion direction. Specifically, this can be achieved using a conical or stepped tapered structure, generating radial compressive force through geometric shape changes. Conical coupling insertion refers to the surface contact between the outer wall of the hose at the outlet of the peristaltic pump 31 and the conical surface of the peristaltic pump hose inlet 113b. Specifically, this can be achieved using an interference fit between an elastic silicone material and a metal conical surface, achieving self-sealing through elastic deformation of the material.

[0043] Specifically, when the hose at the liquid outlet of the peristaltic pump 31 is inserted along the tapered conical surface, the tube wall is elastically deformed by the radial compression of the conical surface, so that the outer wall of the hose at the liquid outlet of the peristaltic pump 31 forms continuous and close contact with the conical surface. In a vacuum negative pressure environment, the hose at the liquid outlet of the peristaltic pump 31 continuously maintains a pressing force on the conical surface due to the elasticity of the material, effectively preventing gas leakage from the connection. The guiding effect of the conical structure enables the hose at the liquid outlet of the peristaltic pump 31 to automatically align and position during the insertion process, and axial constraint can be achieved without the need for an auxiliary fixing device. When external vibration or pressure fluctuation occurs, the friction force generated by the conical coupling can prevent the axial displacement of the silicone tube and maintain the stability of the connection.

[0044] The tapered surface achieves self-sealing through geometric coordination, eliminating potential leaks caused by loose fasteners. Existing flat-end connections are prone to localized deformation of the silicone tube under vacuum, resulting in gaps in the sealing surface. The tapered conical surface evenly compresses the silicone tube, forming a complete sealing ring. This effectively resolves the problem of leaks at the silicone tube connection under vacuum conditions and ensures stable vacuum levels within the mixing tank 11 during the addition of catalyst and initiator.

[0045] See also Figure 1 and Figure 2 The present application further proposes a stirrer 12, comprising 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 manner, and 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 barrel 11 and is connected to the stirring blade 123.

[0046] In this embodiment, the motor 121 refers to the power source for driving the stirring shaft 124 to rotate, and can be specifically implemented by a three-phase asynchronous motor to provide initial kinetic energy for the stirring action. The reducer 122 refers to a speed change device for adjusting the output speed of the motor 121, and can be specifically implemented by a planetary gear reducer, which increases the torque by reducing the speed to meet the stirring requirements of high-viscosity slurries. The stirring shaft 124 refers to a rigid transmission component connecting the reducer 122 and the stirring blade 123, and can be specifically implemented by a hollow shaft made of stainless steel, which reduces the overall weight while ensuring structural strength. The stirring blade 123 refers to a mixing component that directly contacts the slurry.

[0047] Specifically, the output shaft of the motor 121 is rigidly connected to the input end of the reducer 122 through a coupling, and the output end of the reducer 122 is fixed to the top of the stirring shaft 124 through a flange. The bottom of the stirring shaft 124 extends to the inner cavity of the stirring barrel 11 and is bolted to the stirring blade 123. When the motor 121 is started, the power is transmitted to the stirring shaft 124 after the speed is reduced and the torque is increased by the reducer 122, driving the stirring blade 123 to rotate around the axis. The intervention of the reducer 122 controls the speed of the stirring blade 123 within a range suitable for the viscosity of the ceramic slurry, avoiding splashing of the slurry due to excessive speed. The full-length design of the stirring shaft 124 ensures that the stirring blade 123 can cover the effective mixing area of ​​the flat-bottomed inner barrel 111, eliminating the stirring blind spot.

[0048] This solution, through a rigid direct connection between motor 121, reducer 122, and agitator shaft 124, eliminates energy loss in the intermediate transmission link, achieving a highly integrated power transmission system and addressing the vibration and energy loss issues associated with dispersed transmission components in traditional equipment. The precise speed regulation of reducer 122 allows the mixing process to adapt to the process requirements of different formulations, reducing the need for manual adjustments during production.

[0049] See also Figure 1 、 Figure 2 and Figure 4 The present application further proposes that a mechanical seal structure 14 is provided between the stirring shaft 124 and the stirring barrel 11. The mechanical seal structure 14 includes a flange 141, a stationary ring 142, a dynamic ring 143, a spring 144, a spring seat 145 and a sealing ring assembly; the flange 141 is fixedly mounted on the barrel cover 113 of the stirring barrel 11 by bolts; the stationary ring 142 is fixedly mounted on the flange 141; the dynamic ring 143 is sleeved on the stirring shaft 124 and rotates synchronously therewith, and the end face of the dynamic ring 143 and the end face of the stationary ring 142 fit together to form an axial sealing pair; the 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 spring seat 145 and the back of the dynamic ring 143 (the side of the non-sealing end face), which is used to provide axial compression force to the dynamic ring 143 so that it maintains close contact with the static ring 142; the sealing ring assembly includes a dynamic ring O-ring 146 arranged on the inner ring of the dynamic ring 143, a static ring O-ring 147 arranged between the static ring 142 and the flange 141, and a spring seat O-ring 148 arranged between the spring seat 145 and the stirring shaft 124.

[0050] In this embodiment, the mechanical seal structure 14 is used to seal the dynamic gap between the lid 113 of the mixing drum 11 and the rotating agitator shaft 124, preventing leakage of ceramic slurry and air during the mixing process. Flange 141 is uniformly secured circumferentially to the equipment flange (static pressure ring) of the lid 113 of the mixing drum 11 using hexagonal bolts. Flange 141 is machined with a mounting groove specifically for a static ring 142, which is used to position and install the static ring 142. Static ring 142 is made of reaction-bonded silicon carbide (suitable for ceramic slurries containing abrasive particles) and is press-fitted into the mounting groove of flange 141 using an interference fit. A static O-ring 147 (made of fluororubber) is positioned between the static ring 142 and the bottom of the flange 141 groove, forming the first static sealing barrier. The end surface of the static ring 142 is diamond-polished to a mirror finish. The dynamic ring 143 is made of cemented carbide and is circumferentially secured to the agitator shaft 124 via a keyway. The end faces of dynamic ring 143 and static ring 142 are precisely matched, forming a liquid film seal under the pressure of spring 144. A dynamic ring O-ring 146 (made of polytetrafluoroethylene-coated rubber) is installed on the inner ring of dynamic ring 143 to ensure sealing while allowing for slight axial floating and floating compensation of the dynamic ring. Spring 144 utilizes multiple groups of Hastelloy alloy coil springs (resistant to slurry corrosion). One end of spring 144 is connected to the back of dynamic ring 143, and the other end is connected to spring seat 145, providing stable axial compression to ensure that the sealing surface remains in contact even when the slurry viscosity fluctuates. Dynamic ring O-ring 146 adopts a double-lip structure to effectively prevent slurry particles from invading the shaft sleeve gap; static ring O-ring 147 adopts a rectangular cross-section sealing ring to improve extrusion resistance. A spring seat O-ring 148 (made of fluororubber) is provided between the spring seat 145 and the stirring shaft 124 to form a static seal, blocking 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) in 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.

[0051] When the stirring shaft 124 rotates, the dynamic ring 143 rotates synchronously with the stirring shaft 124, and the static ring 142 is fixed to the barrel cover 113 of the stationary stirring barrel 11 through the flange 141; the spring 144 pushes the dynamic ring 143 and the end face of the static 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.

[0052] This solution utilizes a rigid contact seal between the dynamic ring 143 and the static ring 142 to effectively block air infiltration during vacuum mixing, maintaining a stable vacuum level within the mixing drum 11 and preventing reduced slurry vacuum degassing effectiveness due to seal failure. This also reduces the frequency of equipment maintenance due to seal wear and ensures the stability of the continuous production process.

[0053] See also Figure 1 and Figure 2 The present application further proposes that the stirring blade 123 is a single-layer, double-layer or multi-layer cross-paddle blade.

[0054] In this embodiment, the cross-paddle blade refers to a stirring blade 123 with a symmetrical cross-shaped structure, which can be specifically achieved by welding four rectangular paddles in an orthogonal manner to the end of the stirring shaft 124. Its symmetrical structure synchronously generates radial and axial flow shear forces during rotation. A single-layer structure refers to a structure in which only one layer of cross-paddle blades is arranged along the axial direction of the stirring shaft 124. Specifically, a single blade group can be installed at the lower end of the stirring shaft 124 to achieve this, which is suitable for rapid mixing of shallow slurries. A double-layer or multi-layer structure refers to a structure in which two or more groups of cross-paddle blades are arranged at intervals along the axial direction of the stirring shaft 124. Specifically, an upper and lower group of blades can be installed at a preset interval to achieve this, thereby enhancing the longitudinal mixing effect by forming a multi-stage circulating flow field.

[0055] Specifically, when the symmetrical structure of the cross-paddle blades rotates, the four paddles simultaneously push the slurry to produce radial centrifugal motion and axial up-and-down convection. Single-layer blades form horizontal vortices in the shallow slurry; double-layer blades form a closed circulation flow through the downward pressure of the upper paddle and the upward push of the lower paddle, promoting the longitudinal migration of components; multi-layer blades use step-by-step shearing to repeatedly stretch and fold the high-viscosity slurry in the multi-stage flow field to achieve deep homogenization. When the cross-paddle blades rotate, they produce radial centrifugal motion and axial up-and-down convection, which can cause bubbles at the bottom of the slurry to float to the surface of the slurry and break, making the vacuum degassing effect better. During the vacuum isobaric stirring stage of adding catalysts and initiators, the catalysts and initiators added to the slurry can be quickly dispersed to avoid excessive concentrations of local catalysts and initiators in the slurry and premature solidification.

[0056] In some specific embodiments, the upper and lower layers of the double-layer cross-paddle blades can be set to different sizes to optimize flow field uniformity through differentiated shear force distribution.

[0057] This solution uses the multi-directional shearing action of cross-shaped blades and an expandable hierarchical design to form a composite flow field for the slurry in three-dimensional space, achieving more effective vacuum degassing of the slurry and rapid dispersion and uniform distribution of catalysts and initiators added to the slurry, thereby avoiding premature solidification of the slurry due to excessive local concentration of catalysts and initiators.

[0058] See also Figure 1 and Figure 2 The present application further proposes that the jacket 11a is provided with a water inlet 11b and a water outlet 11c connected to the cooling circulation machine 21, and the water inlet 11b and the water outlet 11c are used for circulating the cooling medium to cool the slurry in the flat-bottom inner barrel 111.

[0059] In this embodiment, the cooling cycle machine 21 refers to a temperature control device with a medium cooling circulation function. Specifically, it can be implemented using a compressor refrigeration system, and a constant temperature output of the cooling medium is achieved by setting a temperature threshold. The jacket 11a refers to a closed cavity structure wrapped around the outer wall of the flat-bottomed inner barrel 111. This closed cavity structure forms a three-dimensional heat exchange space surrounding the flat-bottomed inner barrel 111. The water inlet 11b and water outlet 11c are pipe interfaces provided at both ends of the jacket 11a for medium circulation. Specifically, they can be connected to the piping of the cooling cycle machine 21 using flange connections to form a closed circulation loop.

[0060] Specifically, the cooling cycle machine 21 is configured as an independent temperature control unit, which continuously supplies low-temperature cooling medium to the jacket 11a through the water 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 and absorbs the heat of the slurry. The medium that has completed the heat exchange returns to the cooler through the water outlet 11c for cooling treatment, forming a continuous circulation cooling path. The jacket 11a structure is designed to maximize the contact area of ​​the flat-bottomed inner barrel 111 by wrapping it, so that the heat conduction efficiency of the cooling medium is effectively improved. The symmetrical layout of the water inlet 11b and the water outlet 11c forms a forced convection circulation mode, avoiding local temperature accumulation caused by medium retention.

[0061] This solution directly connects the cooling circulator 21 to the jacket 11a of the mixing drum 11, creating a closed-loop circulation system that optimizes and shortens the heat transfer path. Furthermore, this solution significantly improves heat exchange efficiency through forced circulation. The integrated cooling system design simplifies the equipment layout and meets the stringent temperature stability requirements of continuous production processes.

[0062] See also Figure 1 and Figure 2 The present application further proposes that the temperature sensor 22 of the ceramic slurry preparation equipment for gel injection molding includes a temperature sensor sleeve 221 and a digital thermocouple 222 welded on the barrel cover 113 of the stirring barrel 11, the temperature sensor sleeve 221 vertically extends into the flat-bottom inner barrel 111, and the digital thermocouple 222 is fixed in the temperature sensor sleeve 221 for real-time measurement of the slurry temperature in the flat-bottom inner barrel 111.

[0063] 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. This upper end is seamlessly welded to a through-hole in the barrel lid 113 via argon arc welding. When the barrel lid 113 is in place, the lower end of the temperature sensor sleeve 221 can be inserted into the slurry for direct contact. The digital thermocouple 222 utilizes a T-shaped armored structure. The probe tip extends into the temperature sensor sleeve 221 and contacts its lower end. The upper end of the digital thermocouple 222 is threadedly secured to the temperature sensor sleeve 221, ensuring accurate measurement of the slurry temperature.

[0064] Temperature sensor sleeve 221 protects the probe of digital thermocouple 222, preventing direct contact with the alkaline slurry and potential corrosion. The probe with temperature sensor sleeve 221 is inserted directly into the slurry, providing real-time feedback on the slurry's temperature and facilitating closed-loop control of cooling water flow and temperature within ±1°C accuracy. Specifically, when digital thermocouple 222 detects that the slurry temperature is above a set threshold, the system immediately activates the cooling water circulation to suppress temperature rise.

[0065] For example, the SiC ceramic slurry prepared by traditional method is gel-casted with acrylamide as monomer, N,N-methylenebisacrylamide as cross-linking agent, tetramethylethylenediamine as catalyst and ammonium persulfate as initiator to form a green blank. Figure 3 A in the above embodiment is prepared by gel casting molding of SiC ceramic slurry using the same formula and the ceramic slurry preparation equipment for gel casting molding is used to prepare the solidified green body. Figure 3 B in. By contrast Figure 3 It can be found from A and B in the figure that the green blank prepared by the traditional method has a large number of pores after gel injection molding and curing, while the green blank prepared by the SiC ceramic slurry prepared by the ceramic slurry preparation equipment for gel injection molding of the present invention has significantly fewer bubbles after gel injection molding and curing, and the quality of the green blank formed by gel injection molding is significantly improved.

[0066] 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 transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A ceramic slurry preparation device for gel casting, characterized in that: The ceramic slurry preparation equipment for gel casting comprises: A vacuum stirring assembly, comprising a stirring barrel, an agitator, and a vacuum pump. One end of the agitator extends into the stirring barrel, and the vacuum pump is connected to the stirring barrel. The agitator is used to stir the slurry in the stirring barrel, and the vacuum pump is used to evacuate the stirring barrel during the stirring process. a temperature control assembly, the temperature control assembly comprising a cooling circulator and a temperature sensor, the cooling circulator being in communication with the mixing barrel and configured to cool the slurry in the mixing barrel, and the temperature sensor being configured to instantly measure the temperature of the slurry in the mixing barrel; And a vacuum feeding component, which includes a peristaltic pump and a closed container. The liquid inlet end of the peristaltic pump is connected to the closed container, the liquid outlet end of the peristaltic pump is connected to the stirring barrel, and the closed container is connected to the stirring barrel, which is used to achieve precise addition of catalyst and initiator to the stirring barrel under a vacuum and isobaric environment.

2. The ceramic slurry preparation device for gel casting according to claim 1, characterized in that: The mixing barrel comprises: a flat-bottom inner barrel, wherein the flat-bottom inner barrel is used to contain slurry; An outer barrel body, wherein the flat bottom inner barrel is accommodated in the outer barrel body and a jacket is formed between the outer barrel body and the flat bottom inner barrel, wherein the jacket is connected to the cooling cycle machine for flowing cooling medium; and a barrel cover, the barrel cover is provided with a vacuum hole, a peristaltic pump hose inlet, a constant pressure hole, an exhaust hole and a vacuum gauge, the vacuum pump is connected to the flat-bottom inner barrel through the vacuum hole, the liquid outlet of the peristaltic pump is connected to the flat-bottom inner barrel through the peristaltic pump hose inlet, the closed container is connected to the flat-bottom inner barrel through the constant pressure hole, the exhaust hole is used to achieve the balance of the flat-bottom inner barrel and the ambient air pressure, and the vacuum gauge is installed on the barrel cover to display the vacuum degree of the flat-bottom inner barrel in real time.

3. The ceramic slurry preparation device for gel casting according to claim 2, characterized in that: Ball valves are installed on the vacuum hole, peristaltic pump hose inlet, constant pressure hole and exhaust hole on the barrel cover.

4. The ceramic slurry preparation device for gel casting according to claim 2, characterized in that: A vacuum pump air-water separator is provided between the vacuum pump and the flat-bottom inner barrel, and the vacuum pump air-water separator is used to measure the amount of water loss in the slurry during the vacuuming process of the ceramic slurry preparation equipment.

5. The ceramic slurry preparation device for gel casting according to claim 2, characterized in that: The peristaltic pump hose inlet is a tapered conical structure, the hose at the peristaltic pump outlet is set to a conical surface, and is inserted into the peristaltic pump hose inlet through conical surface coupling to connect the peristaltic pump outlet with the flat-bottom inner barrel.

6. The ceramic slurry preparation device for gel casting according to claim 1, characterized in that: The agitator includes a motor, a reducer, a stirring blade and a stirring shaft. The motor is connected to the reducer in a transmission manner. The end of the reducer away from the motor is connected to the stirring shaft. The end of the stirring shaft away from the reducer extends into the stirring barrel and is connected to the stirring blade.

7. The apparatus for preparing ceramic slurry for gel casting according to claim 6, wherein: A mechanical sealing structure is provided between the stirring shaft and the stirring barrel, and the mechanical sealing structure includes a flange, a static ring, a dynamic ring, a spring, a spring seat and a sealing ring assembly; the flange is fixedly mounted on the barrel cover of the stirring barrel by bolts; the static ring is fixedly mounted on the flange; the dynamic ring is sleeved on the stirring shaft and rotates synchronously with it, and the end face of the dynamic ring and the end face of the static ring fit together 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 spring seat and the back of the dynamic ring, for providing axial compression force to the dynamic ring so that it maintains close contact with the static ring; the sealing ring assembly includes a dynamic ring O-ring arranged on the inner ring of the dynamic ring, a static ring O-ring arranged between the static ring and the flange, and a spring seat O-ring arranged between the stirring shaft and the spring seat.

8. The apparatus for preparing ceramic slurry for gel casting according to claim 6, wherein: The stirring blades are single-layer, double-layer or multi-layer cross-paddle blades.

9. The apparatus for preparing ceramic slurry for gel casting according to claim 2, wherein: The jacket is provided with a water inlet and a water outlet communicated with the cooling circulation machine, and the water inlet and the water outlet are used for circulating a cooling medium to cool the slurry in the flat-bottom inner barrel.

10. The ceramic slurry preparation device for gel casting according to claim 2, characterized in that: The temperature sensor includes a temperature sensor sleeve and a digital thermocouple welded on the barrel cover of the mixing barrel. The temperature sensor sleeve extends vertically into the flat-bottom inner barrel. The digital thermocouple is fixed in the temperature sensor sleeve and is used to instantly measure the slurry temperature in the flat-bottom inner barrel.

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