A ceramic slip casting apparatus and method

Abstract

The present disclosure relates to the technical field of ceramic production, and provides a ceramic slip casting forming equipment and method. The ceramic slip casting forming equipment comprises a feeding assembly, a forming die and a slip supplementing assembly. The feeding assembly comprises a defoaming barrel and a vacuum defoaming part. The defoaming barrel has a discharge end. The vacuum defoaming part is connected to the side of the defoaming barrel away from the discharge end through a vacuum pipeline. The vacuum defoaming part is used for vacuum defoaming of the slurry in the defoaming barrel. The forming die has a forming cavity formed inside. The forming die has a lower injection port and an upper injection port which are in communication with the forming cavity. The lower injection port is in communication with the discharge end through a slip injection pipeline. The slip supplementing assembly comprises a slip supplementing pipe which is arranged at the upper injection port of the forming die and can selectively connect the vacuum pipeline with the forming cavity, so as to switch the slip supplementing pipe between an exhaust state and a slip supplementing state. The present disclosure can reduce the generation and retention of air bubbles during the slip casting process and also reduce the introduction of air bubbles again during the slip supplementing process.

Description

Technical Field

[0001] This disclosure relates to the field of ceramic production technology, and more specifically, to a ceramic slip casting equipment and method. Background Technology

[0002] Slip casting is a commonly used forming method for ceramic products, especially suitable for ceramic blanks with complex, irregular shapes, thin walls, or large volumes. It has wide applications in daily-use ceramics, sanitary ceramics, and special ceramics. In slip casting of recrystallized silicon carbide ceramics, silicon carbide ceramic slurry is injected into the cavity of a plaster mold, where it deposits to form the blank. For ceramic products with complex structures and thin walls, it is crucial to avoid gas trapped inside the slurry during the slip casting process to prevent the formation of air bubbles and ensure the quality of the formed blank.

[0003] Current ceramic slip casting typically employs direct slip casting, pressure slip casting, or gas-pressurized slip delivery into the mold. For example, the slip can enter the cavity from the bottom of the mold, reducing the possibility of air bubbles from direct pouring. Some slip casting methods use nitrogen or other gases to pressurize and deliver the slip, improving slip delivery and mold cavity filling efficiency. Furthermore, in plaster mold slip casting, the plaster mold continuously absorbs moisture from the slip, causing dehydration and volume loss within the mold cavity. To ensure the integrity of the green body, slip replenishment is necessary based on the drop in the slip level.

[0004] However, during the slurry injection process, when the slurry is added directly from above or below the mold, the flow and tumbling of the slurry can easily trap air inside. When using pressurized gas delivery, if the gas is in direct contact with the slurry or the pressure difference is large, air bubbles may form within the slurry. For high-viscosity ceramic slurries, these trapped bubbles are difficult to rise and escape in time, resulting in gas retention inside the green body and the formation of defects such as pores and voids. Furthermore, during slurry replenishment, slurry impact and air entrainment may occur again, further increasing the likelihood of voids and micropore defects in the green body. Therefore, reducing the generation and retention of air bubbles during the slurry injection and replenishment processes is a critical technical problem that needs to be solved in existing ceramic slip casting technology.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure. Summary of the Invention

[0006] The purpose of this disclosure is to provide a ceramic grouting molding equipment and method to solve the problems of reducing the generation and retention of air bubbles during the grouting process and the replenishment process.

[0007] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part by practice of this disclosure.

[0008] According to one aspect of this disclosure, a ceramic slip casting apparatus is provided, comprising: A feeding assembly includes a deaeration tank and a vacuum deaeration section. The deaeration tank has a discharge end, and the vacuum deaeration section is connected to the side of the deaeration tank away from the discharge end via a vacuum pipeline. The vacuum deaeration section is used to perform vacuum deaeration on the slurry in the deaeration tank. A molding die, wherein a molding cavity is formed inside the molding die, and the molding die has a lower injection port and an upper injection port that communicate with the molding cavity, and the lower injection port is connected to the discharge end through an injection pipe; The slurry replenishment assembly includes a slurry replenishment pipe disposed at the upper injection port, which enables selective communication between the vacuum pipeline and the molding cavity, allowing the slurry replenishment pipe to switch between an exhaust state and a slurry replenishment state. In the exhaust state, the vacuum degassing section extracts from the molding cavity, and in the slurry replenishment state, the slurry replenishment pipe provides replenishing slurry to the molding cavity.

[0009] Optionally, the feeding assembly further includes a ball mill and a diaphragm pump, wherein the diaphragm pump is located between the ball mill and the deaeration tank, and is connected to the discharge port of the ball mill and the feed end of the deaeration tank respectively via pipelines.

[0010] Optionally, the vacuum degassing section includes a vacuum pump connected to the vacuum pipeline. The vacuum pipeline includes a first extraction branch and a second extraction branch. The first extraction branch is connected to the inside of the degassing tank and is used to perform vacuum degassing on the slurry in the degassing tank. The second extraction branch is connected to the slurry replenishment pipe and is used to communicate with the slurry replenishment pipe in the exhaust state.

[0011] Optionally, the bottom of the degassing tank is shaped to gradually taper towards the discharge end. The degassing tank is equipped with stirring blades, which are arranged in multiple layers at intervals along the height of the degassing tank. The stirring blades at the bottom are adapted to the shape of the bottom of the degassing tank.

[0012] Optionally, there is a height difference between the discharge end of the defoaming tank and the lower injection port of the molding mold, so that the slurry flows upward through the injection pipe route of the molding cavity under the action of gravity.

[0013] Optionally, the grouting assembly further includes: An air extraction pipe is coaxially disposed in the slurry filling pipe, and its two ends extend to the molding cavity and the second air extraction branch respectively. An exhaust channel is formed inside the air extraction pipe, and a slurry filling cavity is formed between the outer wall of the air extraction pipe and the inner wall of the slurry filling pipe. The movable plug is slidably disposed in the grouting pipe. The movable plug has a sliding slot on the side facing the molding mold. The air extraction pipe is slidably inserted into the sliding slot. The movable plug is provided with a vent hole, and the two ends of the vent hole are respectively located on the top of the movable plug and the groove wall of the sliding slot. A sealing ring, wherein the sealing ring is an annular protrusion provided on the wall of the grouting pipe, and the end of the air extraction pipe near the molding die has a plug that can be adapted to the sealing ring; The movable plug moves within the grouting pipe, causing the vent port located on the sliding slot wall to move above or below the top of the extraction pipe, thereby selectively blocking the exhaust channel. When the exhaust channel is in a ventilated state, the sealing ring engages with the plug.

[0014] Optionally, when the air extraction pipe is inserted into the sliding slot and its end abuts against the bottom of the sliding slot, the air extraction pipe blocks the vent hole, the sealing ring does not cooperate with the plug, and the slurry filling chamber is connected to the molding chamber; When the active blockage moves away from the molding mold and the vent port on the sliding slot wall moves above the extraction pipe, the extraction pipe connects with the second extraction branch. At this time, the sealing ring and the plug cooperate, and the slurry filling chamber is blocked.

[0015] Optionally, the grouting pipe is provided with a first limiting boss and a second limiting boss at intervals along the direction away from the molding die, the movable plug is located between the first limiting boss and the second limiting boss, and magnetic rings are embedded on the opposite surfaces of the second limiting boss and the movable plug. The suction pipe is provided with a positioning boss, which is located between the first limiting boss and the movable plug. A guide rod is fixed on the positioning boss, and a limiting slider is fixed at the upper end of the guide rod. A groove is opened inside the movable plug for the limiting slider to slide. The diameter of the limiting slider is larger than the diameter of the limiting rod so that the limiting slider will not disengage from the groove. When the movable plug moves from the first limiting boss to the second limiting boss, it can drive the air extraction pipe to move through the guide rod, so that the plug can cooperate with the sealing ring.

[0016] Optionally, the sealing ring has a wedge-shaped cross-section and has a first inclined surface and a second inclined surface. The plug has an abutting inclined surface that mates with the first inclined surface, and the length of the abutting inclined surface is greater than the length of the first inclined surface.

[0017] According to another aspect of the present invention, a ceramic slip casting method is also provided, employing the ceramic slip casting equipment as described above, comprising the following steps: Step S1: The ceramic slurry is conveyed to the degassing tank, and the degassing tank is evacuated by the vacuum degassing section to degas the ceramic slurry. Step S2: Put the slurry filling pipe into the venting state and evacuate the molding cavity; Step S3: Keep the slurry filling pipe in the venting state and inject the ceramic slurry into the molding cavity through the lower injection port of the molding mold; Step S4: After the ceramic slurry is injected, switch the slurry filling pipe to the slurry filling state to fill the molding cavity with slurry.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a ceramic slip casting molding device and method. The ceramic slip is pre-degassed using a vacuum degassing unit to prevent slip containing numerous air bubbles from directly entering the molding cavity, thus reducing the likelihood of porosity in the ceramic body from the slip source. Before slip casting, a slip filling pipe connects the molding cavity and the vacuum pipeline, allowing air to be pre-extracted from the molding cavity, further reducing the possibility of air bubble formation during molding. During slip casting, the slip filling pipe maintains its venting function to prevent gas from being trapped inside the molding cavity. After slip casting, the slip filling pipe switches from venting to filling. When the plaster mold absorbs moisture from the slip, causing a decrease in the slip volume within the molding cavity, the slip filling pipe can promptly replenish the slip volume, compensating for the reduced slip volume. By using the slip filling component to achieve venting and slip replenishment at different molding stages, the generation and retention of air bubbles during slip casting are reduced, and the reintroduction of air bubbles during the filling process is also minimized. This reduces the likelihood of defects such as pores, voids, and micropores forming in the ceramic body, improving the molding quality and stability of the ceramic body.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0020] 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 these drawings without creative effort.

[0021] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0022] Figure 1 This is a schematic diagram of a ceramic slip casting equipment.

[0023] Figure 2 This is a cross-sectional view of the structure of a ceramic slip casting equipment.

[0024] Figure 3 This is an exploded view of the molding die.

[0025] Figure 4 This is a cross-sectional view of the molding die.

[0026] Figure 5 This is a cross-sectional view of the grouting assembly.

[0027] Figure 6 for Figure 5 A magnified view of section A in the middle.

[0028] Figure 7 for Figure 5 A magnified view of section B in the middle.

[0029] Figure 8 This is a longitudinal structural cross-sectional view of the grouting assembly.

[0030] Illustrations: 1. Feeding assembly; 11. Ball mill; 12. Diaphragm pump; 13. Degassing tank; 14. Vacuum degassing section; 141. Vacuum pump; 15. Vacuum pipeline; 151. First extraction branch; 152. Second extraction branch; 16. Grouting pipeline; 17. Agitator blades; 2. Molding mold; 21. Molding cavity; 22. Lower injection port; 23. Upper injection port; 3. Grouting assembly; 31 311. Grouting pipe; 32. Grouting chamber; 33. Air extraction pipe; 34. Plug; 35. Abutting slope; 36. Movable plug; 37. Sliding slot; 38. Vent hole; 39. Slide groove; 30. Sealing ring; 311. First slope; 322. Second slope; 30. First limiting boss; 313. Second limiting boss; 32. Positioning boss; 334. Guide rod; 35. Limiting slider. Detailed Implementation

[0031] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0032] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1: like Figures 1-8 As shown, this invention provides a ceramic slurry casting equipment suitable for slurry casting of ceramic slurries, especially for the casting of recrystallized silicon carbide ceramic blanks with complex structures and thin walls. In view of the defects of existing slurry casting equipment and slurry casting methods that are prone to generating air bubbles, this invention aims to provide a slurry casting equipment that can effectively reduce the generation of air bubbles during the slurry casting process and the replenishment process through structural improvements.

[0035] like Figure 1 , Figure 2 and Figure 3As shown in this embodiment, the ceramic slurry injection molding equipment includes a feeding component 1, a molding mold 2, and a slurry filling component 3. The feeding assembly 1 includes a degassing tank 13 and a vacuum degassing section 14. The degassing tank 13 has a discharge end, and the vacuum degassing section 14 is connected to the side of the degassing tank 13 away from the discharge end through a vacuum pipeline 15. The vacuum degassing section 14 is used to perform vacuum degassing on the slurry in the degassing tank 13. The molding mold 2 has a molding cavity 21 inside. The molding mold 2 has a lower injection port 22 and an upper injection port 23 that communicate with the molding cavity 21. The lower injection port 22 is connected to the discharge end through a slurry injection pipeline 16. The slurry replenishing assembly 3 includes a slurry replenishing pipe 31. The slurry replenishing pipe 31 is set at the upper injection port 23 of the molding mold 2, which enables the vacuum pipeline 15 to selectively communicate with the molding cavity 21, so that the slurry replenishing pipe 31 can switch between an exhaust state and a slurry replenishing state. In the exhaust state, the vacuum degassing section 14 extracts the molding cavity 21. In the slurry replenishing state, the slurry replenishing pipe 31 provides replenishing slurry to the molding cavity 21.

[0036] Specifically, the feeding assembly 1 is used to store the ceramic slurry to be molded, perform vacuum degassing, and deliver the slurry to the molding die 2. The degassing tank 13 has an internal storage space for containing the ceramic slurry and a discharge end for discharging the slurry. Preferably, the discharge end is located at the lower part of the degassing tank 13 so that the degassed slurry is discharged from the lower part of the degassing tank 13.

[0037] The vacuum degassing unit 14 is connected to the side of the degassing tank 13 away from the discharge end via a vacuum pipeline 15, for example, connected to the top or near the top of the degassing tank 13. When the vacuum degassing unit 14 is working, it extracts the gas inside the degassing tank 13 through the vacuum pipeline 15, creating a negative pressure environment inside the degassing tank 13. This causes the gas that was originally entrained, dissolved, or dispersed in the slurry to escape from the slurry, thereby reducing the bubble content in the slurry entering the subsequent grouting process.

[0038] The molding mold 2 has a molding cavity 21 inside, corresponding to the shape of the ceramic blank to be molded. The molding mold 2 can be a plaster mold capable of absorbing water from the slurry. The molding mold 2 has a lower injection port 22 and an upper injection port 23, which are respectively connected to the molding cavity 21. The lower injection port 22 is located at the lower part of the molding mold 2 and is connected to the discharge end of the degassing tank 13 through the slurry injection pipe 16, so that the ceramic slurry after vacuum degassing can enter the molding cavity 21 from the lower part through the slurry injection pipe 16. During slurry injection, the slurry flow rate between the discharge end of the degassing tank 13 and the lower injection port 22 is controlled so that the ceramic slurry gradually flows from the lower part of the molding cavity 21 to the upper part and fills the molding cavity 21. Compared with pouring the slurry directly from the upper part of the molding mold 2, the bottom-up filling method allows the liquid level of the slurry to rise gradually, reducing the impact, tumbling and splashing caused by the slurry falling directly into the molding cavity 21.

[0039] For example, the grouting pipeline 16 can be branched into multiple branches, each of which can be connected to a set of molding molds 2, so that multiple sets of molding molds 2 can be grouted and molded at the same time, which is beneficial to improving molding efficiency.

[0040] The slurry filling component 3 is disposed on the upper part of the molding mold 2, and includes a slurry filling pipe 31 corresponding to the upper injection port 23. One end of the slurry filling pipe 31 is connected to the molding cavity 21 and can be selectively connected to the vacuum pipeline 15, so that the slurry filling pipe 31 can switch between at least the exhaust state and the slurry filling state.

[0041] For example, before grouting, the grouting pipe 31 is in an venting state. At this time, the grouting pipe 31 connects the molding cavity 21 and the vacuum pipeline 15. After the vacuum degassing section 14 is activated, the vacuum degassing section 14 can extract air from the molding cavity 21 through the vacuum pipeline 15 and the grouting pipe 31 to reduce the original air content in the molding cavity 21. During the process of injecting ceramic slurry into the molding cavity 21 from the lower injection port 22, the grouting pipe 31 remains in an venting state. As the ceramic slurry gradually fills the molding cavity 21 from the bottom to the top, the air above the slurry surface and the gas pushed and displaced by the slurry can be discharged through the grouting pipe 31 at the top of the molding cavity 21 and extracted by the vacuum degassing section 14 through the vacuum pipeline 15.

[0042] After filling the molding cavity 21, the evacuation of the molding cavity 21 through the slurry filling pipe 31 is stopped, and the slurry filling pipe 31 is switched from the venting state to the slurry filling state. In the slurry filling state, the slurry filling pipe 31 can provide supplementary slurry into the molding cavity 21. The supplementary slurry is also a ceramic slurry that has undergone vacuum degassing treatment to reduce the possibility of reintroducing air bubbles into the molding cavity 21 during the slurry filling process. When the molding mold 2 is a plaster mold, after the slurry enters the molding cavity 21, the plaster mold continuously absorbs water from the ceramic slurry. As the water is continuously absorbed by the plaster mold, the volume of slurry in the molding cavity 21 decreases. The slurry filling pipe 31, in the slurry filling state, provides supplementary slurry to the molding cavity 21 to compensate for the decrease in slurry volume caused by the plaster mold absorbing water, so that the molding cavity 21 maintains a sufficient amount of slurry. This allows the slurry to be degassed before entering the molding cavity 21, and the air in the molding cavity 21 to be expelled before and during the slurry injection process; in the subsequent water absorption molding process, the slurry replenishment pipe 31 is used again to provide supplementary slurry, thereby completing the slurry injection molding of the ceramic blank.

[0043] In this embodiment, the ceramic slurry is pre-degassed by the vacuum degassing section 14 to prevent slurry containing a large number of air bubbles from directly entering the molding cavity 21, thereby reducing the possibility of porosity in the ceramic body from the slurry source. Before slurry injection, the slurry replenishment pipe 31 connects the molding cavity 21 and the vacuum pipeline 15, allowing air to be pre-extracted from the molding cavity 21, further reducing the possibility of air bubbles being generated during molding. During the slurry injection process, the slurry replenishment pipe 31 maintains its venting function to prevent gas from being trapped inside the molding cavity 21. After slurry injection is completed, the slurry replenishment pipe 31 switches from the venting state to the slurry replenishment state. When the plaster mold absorbs moisture from the slurry, causing a decrease in the volume of slurry in the molding cavity 21, the slurry replenishment pipe 31 can promptly supply additional slurry to the molding cavity 21 to compensate for the amount of slurry in the molding cavity 21. By using the slurry replenishment component 3 to vent air from the molding cavity 21 and replenish slurry at different molding stages, the generation and retention of air bubbles during the slurry injection process can be reduced, and the introduction of air bubbles during the slurry replenishment process can also be reduced, thereby reducing the possibility of defects such as pores, voids and micropores in the ceramic green body and improving the molding quality and quality stability of the ceramic green body.

[0044] like Figure 1 , Figure 2 As shown, the feeding assembly 1 further includes a ball mill 11 and a diaphragm pump 12. The diaphragm pump 12 is located between the ball mill 11 and the deaeration tank 13, and is connected to the discharge port of the ball mill 11 and the feed end of the deaeration tank 13 through pipelines.

[0045] Specifically, the ball mill 11 has a discharge port for discharging slurry, the deaerator tank 13 has a feed end for receiving slurry, the inlet end of the diaphragm pump 12 is connected to the discharge port of the ball mill 11 through a pipeline, and the outlet end of the diaphragm pump 12 is connected to the feed end of the deaerator tank 13 through a pipeline.

[0046] When the equipment is working, the ceramic raw materials are first added to the ball mill 11 for ball milling, so that the raw materials are fully mixed and form a fluid ceramic slurry. After the ball milling is completed, the diaphragm pump 12 is started. The diaphragm pump 12 draws the ceramic slurry in the ball mill 11 through the pipeline connected to the discharge port of the ball mill 11, and transports the ceramic slurry to the deaeration tank 13 through the pipeline connected to the feed end of the deaeration tank 13.

[0047] Furthermore, the vacuum degassing unit 14 includes a vacuum pump 141, which is connected to a vacuum pipeline 15. The vacuum pipeline 15 includes a first suction branch 151 and a second suction branch 152. The first suction branch 151 is connected to the inside of the degassing tank 13 and is used to perform vacuum degassing on the slurry in the degassing tank 13. The second suction branch 152 is connected to the slurry replenishment pipe 31 and is used to communicate with the slurry replenishment pipe 31 in the exhaust state.

[0048] Specifically, one end of the first extraction branch 151 is connected to the extraction end of the vacuum pump 141, and the other end is connected to the inside of the deaeration tank 13. Preferably, the first extraction branch 151 is connected to the side of the deaeration tank 13 away from the discharge end, so that the extraction position is above the slurry surface inside the deaeration tank 13. The vacuum pump 141 is started to extract the gas above the slurry surface inside the deaeration tank 13, creating a negative pressure environment inside the deaeration tank 13. Under the action of negative pressure, the gas entrained inside the ceramic slurry gradually precipitates out and escapes to the surface of the slurry, and is then discharged through the first extraction branch 151, thereby completing the vacuum deaeration of the ceramic slurry.

[0049] One end of the second extraction branch 152 is connected to the vacuum pump 141, and the other end is connected to the slurry filling pipe 31 located on the upper part of the molding mold 2. Before injecting ceramic slurry, the second extraction branch 152 can be connected to the slurry filling pipe 31, and the molding cavity 21 can be evacuated by the vacuum pump 141. The original air in the molding cavity 21 is discharged through the slurry filling pipe 31 and the second extraction branch 152, thereby reducing the air content in the molding cavity 21.

[0050] like Figure 1 , Figure 2 As shown, in this embodiment of the invention, the bottom of the degassing tank 13 is shaped to gradually taper towards the discharge end. A stirring blade 17 is provided inside the degassing tank 13. Multiple layers of stirring blades 17 are arranged at intervals along the height direction of the degassing tank 13, and the stirring blades 17 at the bottom are adapted to the shape of the bottom of the degassing tank 13.

[0051] Specifically, the bottom of the degassing tank 13 can be funnel-shaped, conical, or V-shaped, causing the inner wall of the tank bottom to gradually slope from the periphery towards the discharge end. This allows the slurry at the bottom of the degassing tank 13 to collect along the inner wall of the tank bottom towards the discharge end. Multiple layers of stirring blades 17 are spaced apart along the height of the degassing tank 13, ensuring that ceramic slurry at different heights is stirred. During vacuum degassing, the stirring blades 17 rotate, continuously agitating the ceramic slurry inside the degassing tank 13. This allows gas located in different areas of the slurry to gradually migrate towards the slurry surface and escape under vacuum.

[0052] For example, when the bottom of the defoaming tank 13 gradually contracts towards the discharge end in a V-shape or cone shape, the bottommost stirring blade 17 can have an inclined extension corresponding to this contraction profile, so that the stirring blade 17 can cover the inclined area of ​​the tank bottom during rotation. This reduces the formation of areas with weak flow or slurry stagnation in the high-viscosity ceramic slurry around the tank bottom, at corners, and near the discharge end.

[0053] Furthermore, there is a height difference between the discharge end of the defoaming tank 13 and the lower injection port 22 of the molding mold 2, so that the slurry flows upward from the lower part of the molding cavity 21 through the injection pipe 16 under the action of gravity.

[0054] Specifically, the discharge end of the degassing tank 13 is positioned higher than the lower injection port 22 of the molding die 2, creating a gravitational potential difference between the discharge end and the lower injection port 22 in the degassing tank 13. When the grouting pipeline 16 between the discharge end and the lower injection port 22 is connected, the grout, after vacuum degassing, can flow towards the molding die 2 along the grouting pipeline 16 under gravity. This gravity-driven grout supply method, achieved through the height difference, allows the grout, after vacuum degassing, to maintain its degassed state as much as possible during subsequent transportation.

[0055] In practice, the opening of the grouting pipeline 16 can be adjusted by a control valve installed on the pipeline 16, so that the grout gradually enters the molding cavity 21 at the beginning of grouting, avoiding a sudden and complete opening of the grouting pipeline 16 that would cause a rapid change in the grout flow rate. As the grout in the molding cavity 21 gradually increases, the flow state of the grout can be adjusted according to the actual grouting state until the grout reaches the predetermined grouting volume.

[0056] like Figure 4 , Figure 5 and Figure 6 As shown, in this embodiment of the invention, the grouting component 3 further includes: The air extraction pipe 32 is coaxially disposed in the slurry filling pipe 31, and its two ends extend to the molding cavity 21 and the second air extraction branch 152 respectively. An exhaust channel is formed inside the air extraction pipe 32, and a slurry filling cavity 311 is formed between the outer wall of the air extraction pipe 32 and the inner wall of the slurry filling pipe 31. The movable plug 33 is slidably disposed in the grouting pipe 31. The movable plug 33 has a sliding slot 331 on the side facing the molding mold 2. The air extraction pipe 32 is slidably inserted into the sliding slot 331. The movable plug 33 is provided with a vent hole 332. The two ends of the vent hole 332 are located on the top of the movable plug 33 and the groove wall of the sliding slot 331, respectively. The sealing ring 34 is an annular protrusion on the wall of the grouting pipe 31. The end of the air extraction pipe 32 near the molding mold 2 has a plug 321 that can be adapted to the sealing ring 34. The movable plug 33 moves within the grouting pipe 31, causing the vent 332 port on the wall of the sliding slot 331 to move above or below the top of the exhaust pipe 32, thereby achieving selective sealing of the exhaust channel. When the exhaust channel is in a ventilated state, the sealing ring 34 engages with the plug 321.

[0057] Specifically, the slurry filling pipe 31 is installed at the upper injection port 23 of the molding mold 2 and extends in a direction away from the molding mold 2. The air extraction pipe 32 is coaxially arranged inside the slurry filling pipe 31, and the outer diameter of the air extraction pipe 32 is smaller than the inner diameter of the slurry filling pipe 31, so that a slurry filling cavity 311 for receiving and conveying the replenishing slurry is formed between the outer wall of the air extraction pipe 32 and the inner wall of the slurry filling pipe 31. The air extraction pipe 32 is hollow inside and forms an exhaust channel. One end of the air extraction pipe 32 facing the molding mold 2 is connected to the molding cavity 21, and the other end of the air extraction pipe 32 extends towards the second exhaust branch 152, so that the gas in the molding cavity 21 can be discharged to the second exhaust branch 152 through the exhaust channel. Thus, two separate fluid passages are formed inside the same slurry filling pipe 31, and a gas flow path is formed inside the air extraction pipe 32 located in the center. The annular space between the air extraction pipe 32 and the slurry filling pipe 31 forms a flow and storage space for the replenishing slurry, so that the exhaust of the molding cavity 21 and subsequent slurry filling can be achieved through the same slurry filling assembly 3.

[0058] The grouting pipe 31 also has a movable plug 33 slidably disposed inside. The outer diameter of the movable plug 33 is the same as the inner diameter of the grouting pipe 31. The movable plug 33 can move between different positions along the axial direction of the grouting pipe 31. A sliding slot 331 is provided on the side of the movable plug 33 facing the molding mold 2. The sliding slot 331 extends along the axial direction of the grouting pipe 31 and does not penetrate the movable plug 33. The end of the air extraction pipe 32 facing the movable plug 33 is slidably inserted into the sliding slot 331. The outer diameter of the air extraction pipe 32 is equal to the inner diameter of the sliding slot 331. The movable plug 33 is provided with a vent hole 332. One end of the vent hole 332 is located away from the top of the mold 2, and the other end is located on the groove wall of the sliding slot 331. Therefore, by changing the relative axial position between the movable plug 33 and the suction pipe 32, the positional relationship between the port of the vent hole 332 on the groove wall of the sliding slot 331 and the end of the suction pipe 32 can be changed, and then the suction pipe 32 can be used to block the vent hole 332.

[0059] When the vent 332 port on the wall of the sliding slot 331 moves above the end of the suction pipe 32, the vent 332 communicates with the interior of the sliding slot 331, thereby connecting the vent 332 with the exhaust channel. As a result, the gas in the molding cavity 21 can flow sequentially through the vent 332 to the second suction branch 152, putting the slurry filling pipe 31 in the exhaust state. When the movable plug 33 moves axially along the slurry filling pipe 31, causing the suction pipe 32 to be further inserted into the sliding slot 331, and the pipe wall of the suction pipe 32 blocks the vent 332 port on the wall of the sliding slot 331, the exhaust channel inside the vent 332 and the suction pipe 32 are isolated, and the suction path between the molding cavity 21 and the second suction branch 152 is closed, thereby stopping the suction of the molding cavity 21.

[0060] Meanwhile, a sealing ring 34 is provided at one end of the grouting pipe 31 near the molding mold 2. The sealing ring 34 is formed by the inner wall of the grouting pipe 31 protruding radially inward and surrounding the air extraction pipe 32. A plug 321 that can cooperate with the sealing ring 34 is provided at one end of the air extraction pipe 32 near the molding mold 2. When the plug 321 abuts against the sealing ring 34, the plug 321 closes the lower outlet of the grouting cavity 311 formed between the outer wall of the air extraction pipe 32 and the inner wall of the grouting pipe 31, thus isolating the grouting cavity 311 from the molding cavity 21. When the plug 321 separates from the sealing ring 34, a grouting passage is formed at the lower part of the grouting cavity 311 that communicates with the molding cavity 21, allowing the supplementary grout in the grouting cavity 311 to enter the molding cavity 21.

[0061] like Figure 5 , Figure 6 and Figure 7 As shown, further, when the suction pipe 32 is inserted into the sliding slot 331 and its end abuts against the bottom of the sliding slot 331, the suction pipe 32 blocks the vent 332, the sealing ring 34 does not cooperate with the plug 321, and the filling cavity 311 is connected to the molding cavity 21; when the movable plug 33 moves away from the molding mold 2 and the port of the vent 332 on the wall of the sliding slot 331 moves above the suction pipe 32, the suction pipe 32 is connected to the second suction branch 152, at which time the sealing ring 34 cooperates with the plug 321, and the filling cavity 311 is blocked.

[0062] By changing the position of the movable plug 33, a corresponding on / off relationship can be established between the venting channel and the grouting chamber 311. When the movable plug 33 is in the grouting position, the venting channel is closed and the grouting chamber 311 is open; when the movable plug 33 moves to the venting position, the venting channel is open and the grouting chamber 311 is closed.

[0063] In practice, during the process of evacuating the molding mold 2 or the slurry entering the molding cavity 21 through the lower injection port 22, the movable plug 33 is in the venting position. In this position, the vent 332 on the wall of the sliding slot 331 is located above the end of the venting pipe 32, allowing the venting channel inside the venting pipe 32 to connect with the second venting branch 152 through the vent 332. The vacuum pump 141 operates, and the air in the molding cavity 21 enters the second venting branch 152 through the vent 332 and is then discharged. At the same time, the plug 321 at the end of the venting pipe 32 near the molding mold 2 cooperates with the sealing ring 34 to keep the slurry filling cavity 311 isolated from the molding cavity 21. During the process of the slurry gradually filling the molding cavity 21 from the bottom to the top through the lower injection port 22, the venting state can continue to be maintained. As the slurry level gradually rises, the gas above the slurry and the gas displaced during the slurry filling process can be continuously discharged through the venting pipe 32 located at the top of the molding cavity 21.

[0064] After the molding cavity 21 completes the predetermined grouting, the movable plug 33 moves axially along the grouting pipe 31 to the corresponding grouting position. After the relative position between the movable plug 33 and the extraction pipe 32 changes, the end of the extraction pipe 32 further enters the sliding slot 331, causing the pipe wall of the extraction pipe 32 to block the vent hole 332 on the wall of the sliding slot 331, thereby cutting off the connection between the internal exhaust channel of the extraction pipe 32 and the second extraction branch 152, stopping the extraction of air from the molding cavity 21. Simultaneously, the plug 321 disengages from the sealing ring 34, allowing the grouting cavity 311 to connect with the molding cavity 21. Supplementary grout pre-stored in the grouting cavity 311 or supplied to the grouting cavity 311 by the feeding assembly 1 can then enter the molding cavity 21 from the grouting cavity 311 to compensate for the decrease in grout volume caused by water absorption by the plaster mold.

[0065] By moving the active plug 33 axially within the grouting pipe 31, the grouting pipe 31 can switch between venting and grouting states, and venting and grouting can be carried out separately at different stages. On the one hand, this is beneficial for continuously venting the gas in the forming cavity 21 during the pre-venting and bottom grouting process. On the other hand, it can prevent the generation of air bubbles due to vacuum suction and grout impact during the subsequent grouting process, thereby further reducing the possibility of forming pores and voids inside the ceramic body.

[0066] It is understandable that, since the outer diameter of the movable blockage 33 is the same as the inner diameter of the slurry filling pipe 31, when the air extraction pipe 32 is inserted into the sliding slot 331 and the air extraction pipe 32 blocks the vent 332, the slurry filling pipe 31 is in a blocked state; when the vacuum pump 141 is started, the suction force of the second air extraction branch 152 can attract the movable blockage 33 to move away from the molding mold 2.

[0067] like Figure 5 , Figure 6 and Figure 8 As shown, further, the grouting pipe 31 is provided with a first limiting boss 35 and a second limiting boss 36 spaced apart along the direction away from the molding die 2. The movable plug 33 is located between the first limiting boss 35 and the second limiting boss 36. Magnetic rings are embedded on the opposing surfaces of the second limiting boss 36 and the movable plug 33. The air extraction pipe 32 is provided with a positioning boss 37, located between the first limiting boss 35 and the movable plug 33. A guide pull is fixed on the positioning boss 37. The upper end of the guide rod 38 is fixed with a limiting slider 39. The movable plug 33 has a groove 333 inside for the limiting slider 39 to slide. The diameter of the limiting slider 39 is larger than the diameter of the limiting rod so that the limiting slider 39 will not disengage from the groove 333. When the movable plug 33 moves from the first limiting boss 35 to the second limiting boss 36, it can drive the air extraction pipe 32 to move through the guide rod 38 so that the plug 321 can cooperate with the sealing ring 34.

[0068] Specifically, the first limiting boss 35 and the second limiting boss 36 can both be formed by the inner wall of the grouting pipe 31 protruding radially inward. The first limiting boss 35 and the second limiting boss 36 are spaced apart along the axial direction of the grouting pipe 31, thereby forming a limiting space between them for the movable blockage 33 to move back and forth. Magnetic rings are respectively embedded on the side of the second limiting boss 36 facing the movable blockage 33 and the side of the movable blockage 33 facing the second limiting boss 36. When the movable blockage 33 moves to a position close to the second limiting boss 36, a magnetic attraction effect is generated between the two magnetic rings, so that the movable blockage 33 can be kept in a position close to the second limiting boss 36 to maintain the corresponding exhaust working state of the grouting assembly 3.

[0069] Meanwhile, a positioning boss 37 is fixed on the outer wall of the suction pipe 32. The positioning boss 37 protrudes outward along the radial direction of the suction pipe 32 and is located between the first limiting boss 35 and the movable blockage 33.

[0070] When the grouting assembly 3 is in the initial grouting state, the positioning boss 37 abuts against the first limiting boss 35, preventing the suction pipe 32 from moving further towards the molding mold 2. The lower end of the movable plug 33 abuts against the positioning boss 37, keeping the movable plug 33 in a position close to the first limiting boss 35. At this time, the upper end of the suction pipe 32 is inserted into the sliding slot 331, blocking the vent 332 port located on the wall of the sliding slot 331, thereby isolating the exhaust channel inside the suction pipe 32 from the second suction branch 152. In this state, the plug 321 at the end of the suction pipe 32 near the molding mold 2 is separated from the sealing ring 34, the grouting cavity 311 can communicate with the molding cavity 21, and the grouting assembly 3 is in the grouting state.

[0071] Furthermore, the guide rod 38 extends axially along the grouting pipe 31 toward the movable plug 33, and a limiting slider 39 is fixedly installed at its upper end. A corresponding groove 333 is provided inside the movable plug 33, and the limiting slider 39 is slidably disposed within the groove 333. The entire groove 333 is located inside the movable plug 33. A through hole is provided at the bottom of the groove near the positioning boss 37 for the guide rod 38 to pass through. The diameter of the limiting slider 39 is larger than the diameter or lateral dimension of the guide rod 38, allowing the limiting slider 39 to be restricted by the groove 333. The limiting slider 39 can both slide relative to the groove 333 and form axial linkage with the movable plug 33 after reaching the predetermined end of the groove 333.

[0072] When switching from grouting to venting, the movable plug 33 moves a first stroke from the first limiting boss 35 to the second limiting boss 36. As the movable plug 33 begins to move towards the second limiting boss 36, the positioning boss 37 on the suction pipe 32 remains abutted against the first limiting boss 35, and the limiting slider 39 is located in the groove 333 on the side opposite to the positioning boss 37, thus temporarily keeping the suction pipe 32 stationary. At this time, the movable plug 33 moves axially relative to the suction pipe 32, the guide rod 38, and the limiting slider 39, and the limiting slider 39 slides relative to the groove 333 inside the movable plug 33. As the movable plug 33 moves, the vent hole 332 on the wall of the sliding slot 331 gradually moves relative to the upper end of the suction pipe 32. When the vent 332 port moves above the upper end of the suction pipe 32, the exhaust channel is connected to the second suction branch 152 through the vent 332, so that an exhaust path is established between the molding cavity 21 and the vacuum degassing section 14.

[0073] After completing the first stroke, the movable plug 33 continues to move towards the second limiting boss 36. Since the limiting slider 39 has already abutted the end of the slide groove 333, when the movable plug 33 continues to move, it can drive the guide rod 38 to move synchronously through the limiting slider 39. The guide rod 38 further drives the positioning boss 37 and the air extraction pipe 32 to move axially along the grouting pipe 31. Thus, the movable plug 33 and the air extraction pipe 32 move synchronously in the second stroke. As the air extraction pipe 32 moves away from the molding mold 2, the plug 321, which is located at the end of the air extraction pipe 32 near the molding mold 2, gradually moves closer to the sealing ring 34. When the movable plug 33 completes the second stroke and its top end abuts the second limiting boss 36, the plug 321 moves to a position that cooperates with the sealing ring 34. The plug 321 and the sealing ring 34 together seal the grouting cavity 311 between the outer wall of the air extraction pipe 32 and the inner wall of the grouting pipe 31, thus separating the grouting cavity 311 from the molding cavity 21. Meanwhile, since the active plug 33 has established a connection between the vent 332 and the exhaust channel during the first stroke, a stable exhaust working state is formed after the active plug 33 reaches the second limiting boss 36. At this time, the vacuum pump 141 can be started to pump air from the molding cavity 21.

[0074] When it is necessary to exit the venting state and re-enter the slurry filling state, ceramic slurry can be injected into the slurry filling chamber 311. After the ceramic slurry fills the slurry filling chamber 311, injection continues. The pressure in the slurry filling chamber 311 can exert a squeezing force on the plug 321 of the suction pipe 32. When the squeezing force is greater than the adsorption force of the magnetic ring between the movable plug 33 and the second limiting boss 36, the movable plug 33 contacts and abuts against the second limiting boss 36 and moves away from the second limiting boss 36. This allows the suction pipe 32 to move and reset towards the molding mold 2. After the movable plug 33 resets, the suction pipe 32 is reinserted into the sliding slot 331 and the vent 332 is blocked, cutting off the suction path between the molding cavity 21 and the second suction branch 152. At the same time, the plug 321 and the sealing ring 34 are disengaged, allowing the slurry filling chamber 311 to reconnect with the molding cavity 21, so that the replenished slurry can enter the molding cavity 21.

[0075] like Figure 5 and Figure 7 As shown, the sealing ring 34 has a wedge-shaped cross-section and has a first inclined surface 341 and a second inclined surface 342. The plug 321 has an abutting inclined surface 322 that cooperates with the first inclined surface 341. The length of the abutting inclined surface 322 is greater than the length of the first inclined surface 341.

[0076] For example, the sealing ring 34 is disposed on the side of the grouting pipe 31 near the molding mold 2, and protrudes radially inward from the inner wall of the grouting pipe 31 to form a ring structure. The cross-section of the sealing ring 34 is wedge-shaped, and the wedge structure has a first inclined surface 341 and a second inclined surface 342 arranged opposite each other along the axial direction. The first inclined surface 341 faces the side where the plug 321 is located, and is used to abut against the plug 321; the second inclined surface 342 is located on the side of the first inclined surface 341 away from the plug 321, and extends obliquely towards the inner wall of the grouting pipe 31. The plug 321 has an abutting inclined surface 322 on the side facing the sealing ring 34. The inclination direction of the abutting inclined surface 322 is adapted to the first inclined surface 341 of the sealing ring 34, so that when the plug 321 approaches the sealing ring 34, the abutting inclined surface 322 can gradually contact the first inclined surface 341.

[0077] When the grouting component 3 is in the grouting state, the air extraction pipe 32 is located close to the molding mold 2, the plug 321 and the sealing ring 34 are separated from each other, and a flow gap for grouting material is formed between the plug 321 and the sealing ring 34; when the movable plug 33 moves to the exhaust position, the abutting inclined surface 322 of the plug 321 and the first inclined surface 341 of the sealing ring 34 form a ring abutting fit, thereby sealing the grouting cavity 311 formed between the outer wall of the air extraction pipe 32 and the inner wall of the grouting pipe 31, so that the grouting cavity 311 is isolated from the molding cavity 21.

[0078] The length of the abutting inclined surface 322 on the plug 321 is greater than the length of the first inclined surface 341 of the sealing ring 34. When the plug 321 and the sealing ring 34 reach the predetermined mating position, the first inclined surface 341 of the sealing ring 34 can fall into the effective mating range of the abutting inclined surface 322 of the plug 321. The portion of the abutting inclined surface 322 that extends beyond the first inclined surface 341 extends into the grouting cavity 311, which facilitates the grout to exert a reverse extrusion force on the air extraction pipe 32 when grout is injected into the grouting cavity 311.

[0079] For example, located below the inclined surface 322, the end of the suction pipe 32 first contracts inward and then expands outward to facilitate the guidance of the slurry and prevent it from entering the suction pipe 32. Simultaneously, there is a gap between the end of the suction pipe 32 near the molding cavity 21 and the molding cavity 21, further preventing slurry from entering the suction pipe 32. Additionally, the end of the slurry replenishing pipe 31 near the molding cavity 21 is positioned close to the edge of the molding cavity 21, and the wall of this end of the slurry replenishing pipe 31 has a flared structure. This guides the slurry from flowing from the wall of the slurry replenishing pipe 31 into the molding cavity 21, preventing it from entering the suction pipe 32; it also prevents slurry from falling directly into the slurry replenishing pipe 31 and generating air bubbles.

[0080] Example 2: This invention also provides a ceramic slip casting method, using the ceramic slip casting equipment described above, comprising the following steps: Step S1: The ceramic slurry is conveyed to the degassing tank 13, and the degassing tank 13 is evacuated by the vacuum degassing section 14 to perform vacuum degassing on the ceramic slurry. Step S2: Put the slurry filling pipe 31 into the exhaust state and evacuate the molding cavity 21; Step S3: Keep the slurry filling pipe 31 in the venting state and inject the ceramic slurry into the molding cavity 21 through the lower injection port 22 of the molding mold 2; Step S4: After the ceramic slurry is injected, switch the slurry filling pipe 31 to the slurry filling state to fill the molding cavity 21 with slurry.

[0081] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0082] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A ceramic slip casting molding device, characterized in that, include: The feeding assembly (1) includes a degassing tank (13) and a vacuum degassing section (14). The degassing tank (13) has a discharge end, and the vacuum degassing section (14) is connected to the degassing tank (13) through a vacuum pipeline (15). The vacuum degassing section (14) is used to perform vacuum degassing on the slurry in the degassing tank (13). A molding die (2) has a molding cavity (21) inside. The molding die (2) has a lower injection port (22) and an upper injection port (23) that communicate with the molding cavity (21). The lower injection port (22) is connected to the discharge end through an injection pipe (16). The slurry filling component (3) includes a slurry filling pipe (31), which is located at the upper injection port (23) and enables the vacuum pipeline (15) to selectively communicate with the molding cavity (21) so that the slurry filling pipe (31) can switch between the exhaust state and the slurry filling state. In the exhaust state, the vacuum degassing section (14) extracts the molding cavity (21). In the slurry filling state, the slurry filling pipe (31) provides supplementary slurry to the molding cavity (21).

2. The ceramic slip casting equipment according to claim 1, characterized in that, The feeding assembly (1) also includes a ball mill (11) and a diaphragm pump (12). The diaphragm pump (12) is located between the ball mill (11) and the deaerator tank (13), and is connected to the outlet of the ball mill (11) and the feed end of the deaerator tank (13) through pipelines.

3. The ceramic slip casting equipment according to claim 1, characterized in that, The vacuum degassing section (14) includes a vacuum pump (141), which is connected to the vacuum pipeline (15). The vacuum pipeline (15) includes a first suction branch (151) and a second suction branch (152). The first suction branch (151) is connected to the inside of the degassing tank (13) and is used to perform vacuum degassing on the slurry in the degassing tank (13). The second suction branch (152) is connected to the slurry replenishment pipe (31) and is used to communicate with the slurry replenishment pipe (31) in the exhaust state.

4. The ceramic slip casting equipment according to claim 3, characterized in that, The bottom of the defoaming tank (13) is gradually tapering towards the discharge end. The defoaming tank (13) is provided with stirring blades (17). The stirring blades (17) are arranged in multiple layers along the height direction of the defoaming tank (13), and the stirring blades (17) at the bottom are adapted to the shape of the bottom of the defoaming tank (13).

5. The ceramic slip casting equipment according to claim 4, characterized in that, There is a height difference between the discharge end of the defoaming tank (13) and the lower injection port (22) of the molding mold (2), so that the slurry flows upward from the lower part of the molding cavity (21) through the injection pipe (16) under the action of gravity.

6. The ceramic slip casting equipment according to claim 3, characterized in that, The grouting assembly (3) also includes: An air extraction pipe (32) is coaxially disposed in the slurry filling pipe (31), and its two ends extend to the molding cavity (21) and the second air extraction branch (152) respectively. An exhaust channel is formed inside the air extraction pipe (32), and a slurry filling cavity (311) is formed between the outer wall of the air extraction pipe (32) and the inner wall of the slurry filling pipe (31). A movable plug (33) is slidably disposed in the grouting pipe (31). The movable plug (33) has a sliding slot (331) on the side facing the molding mold (2). The air extraction pipe (32) is slidably inserted into the sliding slot (331). The movable plug (33) is provided with a vent hole (332). The two ends of the vent hole (332) are located on the top of the movable plug (33) and the groove wall of the sliding slot (331), respectively. The sealing ring (34) is an annular protrusion on the wall of the grouting pipe (31), and the end of the air extraction pipe (32) near the molding mold (2) has a plug (321) that can be adapted to the sealing ring (34); The movable plug (33) moves within the grouting pipe (31), causing the vent (332) port located on the wall of the sliding slot (331) to move above or below the top of the exhaust pipe (32), thereby achieving selective blocking of the exhaust channel. When the exhaust channel is in the ventilated state, the sealing ring (34) engages with the plug (321).

7. The ceramic slip casting equipment according to claim 6, characterized in that, When the air extraction pipe (32) is inserted into the sliding slot (331) and its end abuts against the bottom of the sliding slot (331), the air extraction pipe (32) blocks the air hole (332), the sealing ring (34) does not cooperate with the plug (321), and the slurry filling cavity (311) is connected to the molding cavity (21); When the active plug (33) moves away from the molding die (2) and the vent (332) port on the wall of the sliding slot (331) moves above the suction pipe (32), the suction pipe (32) is connected to the second suction branch (152). At this time, the sealing ring (34) cooperates with the plug (321), and the slurry filling chamber (311) is blocked.

8. The ceramic slip casting equipment according to claim 6, characterized in that, The grouting pipe (31) is provided with a first limiting boss (35) and a second limiting boss (36) at intervals along the direction away from the molding mold (2). The movable plug (33) is located between the first limiting boss (35) and the second limiting boss (36). Magnetic rings are embedded on the opposite surfaces of the second limiting boss (36) and the movable plug (33). The suction pipe (32) is provided with a positioning boss (37), which is located between the first limiting boss (35) and the movable plug (33). A guide rod (38) is fixed on the positioning boss (37), and a limiting slider (39) is fixed at the upper end of the guide rod (38). The movable plug (33) has a groove (333) for the limiting slider (39) to slide inside. The diameter of the limiting slider (39) is larger than the diameter of the limiting rod so that the limiting slider (39) will not detach from the groove (333). When the movable plug (33) moves from the first limiting boss (35) to the second limiting boss (36), it can drive the air extraction pipe (32) to move through the guide rod (38) so that the plug (321) can cooperate with the sealing ring (34).

9. The ceramic slip casting equipment according to claim 8, characterized in that, The sealing ring (34) has a wedge-shaped cross-section and has a first inclined surface (341) and a second inclined surface (342). The plug (321) has an abutting inclined surface (322) that cooperates with the first inclined surface (341). The length of the abutting inclined surface (322) is greater than the length of the first inclined surface (341).

10. A method for ceramic slip casting, characterized in that, The ceramic slip casting equipment as described in any one of claims 1-9 includes the following steps: Step S1: The ceramic slurry is transported to the degassing tank (13), and the degassing tank (13) is evacuated by the vacuum degassing section (14) to degas the ceramic slurry. Step S2: Put the slurry filling pipe (31) in the exhaust state and evacuate the molding cavity (21); Step S3: Keep the slurry filling pipe (31) in the venting state and inject the ceramic slurry into the molding cavity (21) through the lower injection port (22) of the molding mold (2); Step S4: After the ceramic slurry is injected, switch the slurry filling pipe (31) to the slurry filling state to fill the molding cavity (21) with slurry.

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