Self-cleaning ceramic slurry filtration system and method of operation thereof

Abstract

The application provides a self-cleaning ceramic slurry filtering system and a working method thereof, which comprises an outer cylinder, an inner cylinder and a liquid level sensor assembly, the outer cylinder is sleeved outside the inner cylinder, a screen is attached to the inner wall of the inner cylinder, the outer wall of the inner cylinder is provided with an outflow hole, the top of the inner cylinder is provided with an inlet, the bottom of the inner cylinder is provided with a cleaning discharge outlet, and the bottom side of the outer cylinder is provided with an outlet; in a filtering state, the cleaning discharge outlet is closed, the slurry flows into the inner cylinder from the inlet, and then flows through the screen and the outflow hole to flow into the outer cylinder and then flows out from the outlet; when the liquid level sensor assembly senses that the slurry liquid surface is located at the top of the inner cylinder, the system automatically enters a self-cleaning state. The screen is arranged around the inner wall of the inner cylinder to form a three-dimensional screen structure, which is beneficial to temporarily depositing large particles that cannot pass through the screen at the bottom of the inner cylinder, and the large particles remaining at the bottom of the inner cylinder are discharged through the cleaning discharge outlet when the screen is cleaned, so that the self-cleaning effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of slurry filtration technology, specifically to a self-cleaning ceramic slurry filtration system and its working method. Background Technology

[0002] Ceramic slurry is a preliminary preparation step for powder granulation and tape casting, and its quality directly affects the performance of the granulated ceramic powder and the quality of the tape casting. To control defects such as large particles and agglomeration in the slurry, it is usually necessary to filter the ceramic slurry before powder granulation and tape casting.

[0003] A patent document with publication number CN113813676A discloses a portable ceramic slurry filter for 3D printing, comprising a filter cylinder, a sealing top cover sealed to the top of the filter cylinder, a drive motor mounted at the center of the top of the sealing top cover, a pressure pump mounted on the top of the sealing top cover, an air supply pipe connected to the output end of the pressure pump, air outlet nozzles evenly arranged on the surface of the air supply pipe, ultrasonic bubble detectors mounted on the bottom surface of the sealing top cover and the surface of the air supply pipe, an indicator light mounted on the top of the sealing top cover, L-shaped protective slide rails evenly arranged on the surface of the filter cylinder, and a round rod connected to the output end of the drive motor.

[0004] In existing technologies, when using filters to filter slurry, the slurry flows into the outer cylinder from the inlet, and after being filtered by the filter element, it flows out of the outer cylinder from the outlet. Filter residue remains on the surface of the filter element, causing filter clogging. This requires workers to disassemble the filter for cleaning, which is labor-intensive and inefficient. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a self-cleaning ceramic slurry filtration system and its operating method.

[0006] According to the present invention, a self-cleaning ceramic slurry filtration system includes an outer cylinder, an inner cylinder, and a liquid level sensor assembly. The outer cylinder is sleeved outside the inner cylinder. A screen is attached to the circumference of the inner wall of the inner cylinder. An outlet hole is provided on the outer wall of the inner cylinder. A feed inlet is provided at the top of the inner cylinder. A cleaning outlet is provided at the bottom of the inner cylinder. A discharge outlet is provided on the bottom side of the outer cylinder.

[0007] In the filtration state, the cleaning outlet is closed, and the slurry flows into the inner cylinder from the feed inlet and flows through the screen and the outlet hole in sequence before flowing into the outer cylinder and out of the discharge outlet.

[0008] When the liquid level sensor assembly senses that the slurry level is at the top of the inner cylinder, the system automatically enters a self-cleaning state.

[0009] Preferably, the top of the inner cylinder is higher than the top of the outer cylinder, and the top of the outer cylinder is higher than the highest point where the screen is attached to the inner wall of the inner cylinder.

[0010] Preferably, the liquid level sensor assembly includes a first liquid level sensor, a second liquid level sensor, and a third liquid level sensor, wherein the first liquid level sensor and the second liquid level sensor are both disposed between the outer cylinder and the inner cylinder.

[0011] The first liquid level sensor is located at the highest point of the inner wall of the screen, the second liquid level sensor is located at the top of the outer cylinder, and the third liquid level sensor is located at the top of the inner cylinder.

[0012] Preferably, multiple outflow holes are provided, and the multiple outflow holes are evenly distributed around the perimeter of the outer wall of the inner cylinder.

[0013] Preferably, a transducer is provided on the outer wall of the inner cylinder, and the transducer is connected to an ultrasonic generator.

[0014] Preferably, the outer cylinder is mounted on the base, and a spring is provided at the bottom of the outer cylinder, with one end of the spring connected to the outer cylinder and the other end of the spring connected to the base;

[0015] Multiple springs are provided, and the multiple springs are evenly distributed around the bottom of the outer cylinder.

[0016] Preferably, the top of the inner cylinder is provided with a first sealing cover, and the feed inlet is sealed to the first sealing cover;

[0017] The top of the outer cylinder is provided with a second sealing cover, and the outer wall of the inner cylinder is sealed to the second sealing cover;

[0018] The bottom of the inner cylinder and the bottom of the outer cylinder are sealed together by a cleaning outlet. A sealing ring is provided at the bottom of the outer cylinder, and threads are provided on the outer wall of the outlet. The outlet is threadedly connected to the bottom of the outer cylinder.

[0019] The present invention also provides a method for operating a self-cleaning ceramic slurry filtration system, comprising the following steps:

[0020] Step S1: Open the valve at the feed inlet, close the valve at the cleaning outlet, start the ultrasonic generator, and the slurry enters the inner cylinder for filtration.

[0021] Step S2: Close the valves at the inlet and outlet. The ultrasonic generator continues to work, and the slurry in the filtration system continues to be filtered. Open the valve at the cleaning outlet, and the slurry is discharged from the cleaning outlet.

[0022] Step S3: Open the valve at the feed inlet, and the cleaning agent enters the inner cylinder to perform self-cleaning.

[0023] Preferably, step S1 includes the following steps:

[0024] Step S1.1: Open the valve at the feed inlet, close the valve at the cleaning outlet, start the ultrasonic generator, and the slurry flows into the inner cylinder through the feed inlet. With the assistance of the ultrasonic generator, the slurry passes through the screen and flows into the outer cylinder until it flows out of the outlet.

[0025] Step S1.2: When the slurry level reaches the position of the first level sensor, open the outlet valve; when the slurry level reaches the position of the second level sensor, increase the outlet valve; when the slurry level is lower than the position of the first level sensor, close the outlet valve.

[0026] Step S1.3: When all the valves at the discharge port are fully open, and the liquid level of the slurry reaches the position of the third liquid level sensor and remains there for more than 30 seconds, the filtration system enters the self-cleaning operation.

[0027] Preferably, step S3 includes the following steps:

[0028] Step S3.1: Open the valve at the feed inlet and close the valve at the cleaning outlet. The cleaning agent enters the inner cylinder through the feed inlet.

[0029] Step S3.2: When the liquid level of the cleaning agent reaches the position of the first liquid level sensor, close the valve of the feed port, and the ultrasonic generator continues to work. When the set value is reached, open the valve of the cleaning outlet, and the slurry is discharged from the cleaning outlet.

[0030] Step S3.3: Repeat steps S3.1 and S3.2 N times to begin the filtering process.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention forms a three-dimensional screen structure by setting a screen to surround the inner wall of the inner cylinder, which is beneficial to temporarily deposit large particles that cannot pass through the screen at the bottom of the inner cylinder. When the screen is cleaned, the large particles left at the bottom of the inner cylinder are discharged through the cleaning outlet, achieving a self-cleaning effect.

[0033] 2. This invention uses a liquid level sensor to provide feedback on the slurry level. The filtration system automatically determines when the screen needs cleaning based on the flow rate at the outlet, thus achieving fully automatic slurry filtration and self-cleaning, enabling continuous operation without human intervention.

[0034] 3. This invention uses ultrasonic vibration to assist slurry filtration, thereby improving filtration efficiency. The special properties of ultrasonic vibration can avoid or reduce material clogging of the mesh opening.

[0035] 4. This invention, through the design of an inner cylinder, an outer cylinder, and a sealing structure between the inner and outer cylinders, ensures that during the filtration process, the cleaning agent will not volatilize into the air and environmental particles will not enter the slurry, thus affecting the stability of the material. At the same time, inert gas can be introduced during the slurry filtration process to prevent flammable solvents from igniting and exploding, and also to prevent some slurry from undergoing oxidation reactions due to contact with oxygen, which would change the material properties and affect product performance. Attached Figure Description

[0036] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0037] Figure 1 This mainly illustrates the structural diagram of the filtration system of the present invention;

[0038] Figure 2 This mainly illustrates the structural diagram of the inner cylinder of the present invention;

[0039] Figure 3 This mainly illustrates the structural diagram of the filtration system of the present invention;

[0040] Figure 4 The main schematic diagram illustrates the structure of the inner cylinder of this invention.

[0041] As shown in the figure:

[0042] Feed inlet 1, elastic sealing gasket 7, first liquid level sensor 13

[0043] Discharge port 2, transducer 8, second liquid level sensor 14

[0044] Cleaning outlet 3, outer cylinder 9, third liquid level sensor 15

[0045] First sealing cap 4, spring 10, outlet hole 16

[0046] Inner cylinder 5, base 11, thread 17

[0047] Second sealing cover 6, pulley 12 Detailed Implementation

[0048] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0049] like Figures 1 to 4As shown, a self-cleaning ceramic slurry filtration system according to the present invention includes an outer cylinder 9, an inner cylinder 5, and a liquid level sensor assembly. The outer cylinder 9 is sleeved outside the inner cylinder 5. A screen is attached to the circumference of the inner wall of the inner cylinder 5. An outlet hole 16 is provided on the outer wall of the inner cylinder 5. An inlet 1 is provided at the top of the inner cylinder 5. A cleaning outlet 3 is provided at the bottom of the inner cylinder 5. An outlet 2 is provided on the bottom side of the outer cylinder 9. In the filtration state, the cleaning outlet 3 is closed. The slurry flows into the inner cylinder 5 from the inlet 1 and flows through the screen and the outlet hole 16 in sequence before flowing into the outer cylinder 9 and out through the outlet 2. When the liquid level sensor assembly senses that the slurry level is at the top of the inner cylinder 5, the system automatically enters the self-cleaning state.

[0050] This filtration system employs a vertical screen structure, with a screen arranged around the inner wall of the inner cylinder 5. The screen is preferably an ultrafine screen of 500-2000 mesh. By using the ultrafine screen to filter and sieve slurries used in special ceramics such as aluminum nitride, silicon nitride, and high-purity alumina (purity ≥99.7%), the system solves the problem of efficient sieving of materials of 20 microns and below, and in particular, achieves efficient sieving of slurries of 10 microns and below. This reduces the generation of large defects in fired ceramics and improves the stability of ceramic performance.

[0051] The inlet 1 of this filtration system is connected to the slurry pump, and the outlet 2 is connected to the slurry storage tank. The valves at inlet 1 and outlet 2 are either electric or pneumatic. The slurry pump is controlled by a PLC. The process parameters are set via a display screen and stored in the PLC logic. An automated control system is used, equipped with a liquid level sensor to sense the slurry level and provide feedback. Based on the flow rate at outlet 2, the system automatically determines when the screen needs cleaning. The screen cleaning process can be set via a visual interface, and the system cleans autonomously according to the parameters. After cleaning, the filtration system continues to filter the slurry. Through PLC programming, including the setting of the liquid level sensor, fully automated slurry filtration and self-cleaning are achieved, enabling continuous operation without human intervention.

[0052] Specifically, such as Figures 1 to 3As shown, the top of the inner cylinder 5 is higher than the top of the outer cylinder 9, and the top of the outer cylinder 9 is higher than the highest point of the screen attached to the inner wall of the inner cylinder 5. The liquid level sensor assembly includes a first liquid level sensor 13, a second liquid level sensor 14, and a third liquid level sensor 15. Both the first liquid level sensor 13 and the second liquid level sensor 14 are located between the outer cylinder 9 and the inner cylinder 5. The first liquid level sensor 13 is located at the highest point of the screen attached to the inner wall of the inner cylinder 5, the second liquid level sensor 14 is located at the top of the outer cylinder 9, and the third liquid level sensor 15 is located at the top of the inner cylinder 5. In actual operation, the first liquid level sensor 13 and the second liquid level sensor 14 are inserted between the inner cylinder 5 and the outer cylinder 9, with the first liquid level sensor 13 located at the highest point of the screen attached to the inner wall of the inner cylinder 5, the second liquid level sensor 14 located at the top of the outer cylinder 9, and the third liquid level sensor 15 inserted at the top of the inner cylinder 5.

[0053] The system uses three level sensors at different locations to sense the slurry level. Based on the slurry level, it adjusts the size of each inlet and outlet valve and determines whether screen cleaning is needed. During filtration, the slurry level is always higher than the first level sensor 13 and lower than the third level sensor 15. The second level sensor 14 provides feedback. When the slurry level is lower than the second level sensor 14, the valve at outlet 2 is closed; when the slurry level is higher than the second level sensor 14, the valve at ceramic slurry outlet 2 is opened. The system enters cleaning mode when the valve at outlet 2 is at its maximum and the slurry level is higher than the third level sensor 15 for more than 30 seconds. In this state, the system automatically enters self-cleaning mode. The filtration system can automatically determine whether screen cleaning is needed, achieving unattended, automatic, and continuous operation.

[0054] Specifically, such as Figure 2 and Figure 4 As shown, multiple outflow holes 16 are provided, evenly distributed around the outer wall of the inner cylinder 5. After the slurry flows out of the screen, it enters the outer cylinder 9 through the outflow holes 16. The evenly distributed outflow holes 16 on the outer wall of the inner cylinder 5 can buffer the flow rate of the slurry, which is conducive to the uniform flow of the slurry into the outer cylinder 9. The diameter of the outflow holes 16 is larger than the diameter of the screen holes. After the slurry is filtered by the ultrafine screen, the slurry with high purity flows into the outer cylinder 9 through the outflow holes 16 and then flows out from the discharge port 2 on the bottom side of the outer cylinder 9.

[0055] Specifically, such as Figure 1As shown, the outer cylinder 9 is mounted on the base 11. A spring 10 is installed at the bottom of the outer cylinder 9, with one end connected to the outer cylinder 9 and the other end connected to the base 11. Multiple springs 10 are evenly distributed around the bottom of the outer cylinder 9. Six springs 10 can be placed at the bottom of the outer cylinder 9, evenly distributed around its circumference. The bottom of the outer cylinder 9 is connected to the base 11 via screws and nuts. A transducer 8 is installed on the outer wall of the inner cylinder 5, connected to an ultrasonic generator. Two transducers 8 can be installed opposite each other on the side wall of the inner cylinder 5, connected to the ultrasonic generator. The ultrasonic generator provides ultrasonic vibration, accelerating the screening efficiency and preventing screen blockage. The bottom of the base 11 is connected to four pulleys 12. The pulleys 12 facilitate equipment movement and have two modes: a locked state and a free-sliding state. When the equipment is operating, the pulleys 12 can be locked to prevent movement.

[0056] Traditional mechanical vibrating screens can generally only screen powders and slurries larger than 20 microns. When screening powders and slurries smaller than 20 microns, the screen often gets clogged, resulting in low screening efficiency. This filtration system, with its vertical screen structure and combination of ultrasonic vibration, solves the problem of screen clogging and low screening efficiency in traditional vibrating screens when filtering ultrafine materials. Furthermore, the unique properties of ultrasonic vibration can prevent or reduce material clogging of the screen opening.

[0057] Specifically, the inner cylinder 5 is installed at the center of the outer cylinder 9, and the inner cylinder 5 and the outer cylinder 9 are coaxially fitted together. The top of the inner cylinder 5 is provided with a first sealing cover 4, and the feed inlet 1 is sealed to the first sealing cover 4. The top of the inner cylinder 5 is connected and sealed by the first sealing cover 4 and an O-ring. The top of the outer cylinder 9 is provided with a second sealing cover 6, and the outer wall of the inner cylinder 5 is sealed to the second sealing cover 6. The top of the outer cylinder 9 is connected and sealed by the second sealing cover 6, an elastic sealing gasket 7, and an O-ring. The bottom of the inner cylinder 5 and the bottom of the outer cylinder 9 are sealed together by a cleaning outlet 3. The bottom of the outer cylinder 9 is provided with a sealing ring, and the outer wall of the outlet is provided with a thread 17. The outlet is connected to the bottom of the outer cylinder 9 by the thread 17. The bottom of the outer cylinder 9 is provided with an O-ring. By providing the thread 17 and a locking nut at the upper part of the cleaning outlet 3, the bottom of the inner cylinder 5 and the bottom of the outer cylinder 9 are tightly and sealed together.

[0058] By employing a fully enclosed structural design for the inner cylinder 5, outer cylinder 9, and the filtration method that ensures the slurry is completely submerged in the screen, the system effectively avoids the problem of volatile slurries caking on the screen due to volatilization, thus preventing screen blockage and reduced sieving efficiency. Traditional open systems are susceptible to environmental contamination; the fully enclosed design of this filtration system significantly reduces environmental pollution of the sieving material, greatly improving process stability. Inert gas can be introduced during slurry filtration to prevent flammable solvents from igniting or exploding, while also preventing oxidation reactions caused by contact with oxygen. The unique sealing design and protective gas filling method ensure that the material does not come into contact with oxygen, preventing oxidation and ensuring the safety of sieving flammable and explosive materials, thus preventing accidents.

[0059] The present invention also provides a method for operating a self-cleaning ceramic slurry filtration system, comprising the following steps:

[0060] Step S1: Open the valve of feed inlet 1, close the valve of cleaning outlet 3, start the ultrasonic generator, and the slurry enters the inner cylinder 5 for filtration.

[0061] Step S2: Close the valve of inlet 1 and outlet 2, the ultrasonic generator continues to work, the slurry in the filtration system continues to be filtered, open the valve of cleaning outlet 3, and the slurry is discharged from cleaning outlet 3.

[0062] Step S3: Open the valve of the feed port 1, and the cleaning agent enters the inner cylinder 5 to perform self-cleaning.

[0063] Preferably, step S1 includes the following steps:

[0064] Step S1.1: Open the valve of the feed inlet 1, close the valve of the cleaning outlet 3, start the ultrasonic generator, and the slurry flows into the inner cylinder 5 through the feed inlet 1. With the assistance of the ultrasonic generator, the slurry passes through the screen and flows into the outer cylinder 9 until it flows out through the outlet 2.

[0065] Step S1.2: When the liquid level of the slurry reaches the position of the first liquid level sensor 13, open the valve of the outlet 2; when the liquid level of the slurry reaches the position of the second liquid level sensor 14, increase the valve of the outlet 2; when the liquid level of the slurry is lower than the position of the first liquid level sensor 13, close the valve of the outlet 2.

[0066] Step S1.3: When all valves at outlet 2 are fully open, and the slurry level reaches the position of the third level sensor 15 and remains there for more than 30 seconds, the filtration system enters self-cleaning mode.

[0067] Preferably, step S3 includes the following steps:

[0068] Step S3.1: Open the valve of the feed inlet 1 and close the valve of the cleaning outlet 3. The cleaning agent enters the inner cylinder 5 through the feed inlet 1.

[0069] Step S3.2: When the liquid level of the cleaning agent reaches the position of the first liquid level sensor 13, close the valve of the feed port 1, and the ultrasonic generator continues to work. When the set value is reached, open the valve of the cleaning outlet 3, and the slurry is discharged from the cleaning outlet 3.

[0070] Step S3.3: Repeat steps S3.1 and S3.2 N times to begin the filtering process.

[0071] In one specific implementation, the workflow of this filtration system is as follows:

[0072] (1) The ceramic slurry inlet 1 is connected to the slurry pump, the ceramic slurry outlet 2 is connected to the slurry storage tank, the cleaning outlet 3 valve is closed, the transducer 8 is connected to the ultrasonic generator, the valve actuators are electric valves or pneumatic valves, the slurry pump is controlled by PLC, the process parameters are set through the display screen, and the set parameters are stored in the PLC logic.

[0073] (2) Filtration process: 1. Start the ultrasonic generator and the slurry pump to put the slurry into the inner cylinder 5. With the assistance of the ultrasonic generator, the slurry in the inner cylinder 5 flows into the outer cylinder 9 through the screen; 2. When the slurry level in the outer cylinder 9 reaches the position of the first liquid level sensor 13, open the valve of the outlet 2 slightly. When the slurry level is lower than the position of the first liquid level sensor 13, close the valve of the outlet 2. When the liquid level reaches the position of the second liquid level sensor 14, open the valve of the outlet 2; 3. When the valve of the outlet 2 is fully open and the slurry level reaches the third liquid level sensor 15 and remains there for more than 30 seconds, the filtration process enters the self-cleaning process.

[0074] (3) Self-cleaning preparation process: Turn off the slurry pump, close the valve at the outlet 2, continue to vibrate and filter for a period of time (set by inputting the display screen), open the valve at the cleaning outlet 3, wait for all the slurry to be discharged, and then close the valve at the cleaning outlet 3.

[0075] (4) Self-cleaning workflow: 1. The solvent pump operates, feeding the cleaning agent into the inner cylinder 5 through the inlet 1; 2. When the cleaning agent level reaches the position of the first level sensor 13, the solvent pump stops operating and continues ultrasonic vibration for a period of time (set by the user). When the time reaches the set value, the valve of the cleaning outlet 3 is opened, and after all the slurry is discharged, the valve of the cleaning outlet 3 is closed. After repeating the steps N times (the value of N is set by the user), the filtration workflow begins. This process is repeated to achieve continuous operation of the filtration system.

[0076] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0077] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for operating a self-cleaning ceramic slurry filtration system, characterized in that, A self-cleaning ceramic slurry filtration system is adopted. The self-cleaning ceramic slurry filtration system includes an outer cylinder (9), an inner cylinder (5), and a liquid level sensor assembly. The outer cylinder (9) is sleeved outside the inner cylinder (5). A screen is attached around the inner wall of the inner cylinder (5). An outlet hole (16) is provided on the outer wall of the inner cylinder (5). An inlet (1) is provided at the top of the inner cylinder (5). A cleaning outlet (3) is provided at the bottom of the inner cylinder (5). An outlet (2) is provided on the bottom side of the outer cylinder (9). In the filtration state, the cleaning outlet (3) is closed, and the slurry flows into the inner cylinder (5) from the feed inlet (1) and flows through the screen and the outlet hole (16) in sequence before flowing into the outer cylinder (9) and out through the discharge outlet (2); When the liquid level sensor assembly senses that the slurry level is at the top of the inner cylinder (5), the system automatically enters the self-cleaning state; The top of the inner cylinder (5) is higher than the top of the outer cylinder (9), and the top of the outer cylinder (9) is higher than the highest point where the screen is attached to the inner wall of the inner cylinder (5). The liquid level sensor assembly includes a first liquid level sensor (13), a second liquid level sensor (14), and a third liquid level sensor (15). The first liquid level sensor (13) and the second liquid level sensor (14) are both disposed between the outer cylinder (9) and the inner cylinder (5). The first liquid level sensor (13) is located at the highest point of the inner wall of the inner cylinder (5) where the screen is attached. The second liquid level sensor (14) is located at the top of the outer cylinder (9). The third liquid level sensor (15) is located at the top of the inner cylinder (5). A transducer (8) is provided on the outer wall of the inner cylinder (5). The transducer (8) is connected to an ultrasonic generator. The working method of the self-cleaning ceramic slurry filtration system includes the following steps: Step S1: Open the valve of the feed port (1), close the valve of the cleaning outlet (3), start the ultrasonic generator, and the slurry enters the inner cylinder (5) for filtration. Step S2: Close the valve of the feed port (1) and the valve of the discharge port (2), the ultrasonic generator continues to work, the slurry in the filtration system continues to be filtered, open the valve of the cleaning discharge port (3), and the slurry is discharged from the cleaning discharge port (3); Step S3: Open the valve of the feed port (1) and the cleaning agent enters the inner cylinder (5) to perform self-cleaning; Step S1 includes the following steps: Step S1.1: Open the valve of the feed inlet (1), close the valve of the cleaning outlet (3), start the ultrasonic generator, and the slurry flows into the inner cylinder (5) through the feed inlet (1). With the assistance of the ultrasonic generator, the slurry passes through the screen and flows into the outer cylinder (9) to the outlet (2). Step S1.2: When the liquid level of the slurry reaches the position of the first liquid level sensor (13), open the valve of the outlet (2); when the liquid level of the slurry reaches the position of the second liquid level sensor (14), increase the valve of the outlet (2); when the liquid level of the slurry is lower than the position of the first liquid level sensor (13), close the valve of the outlet (2). Step S1.3: When all valves of the outlet (2) are fully opened, and the liquid level of the slurry reaches the position of the third liquid level sensor (15) and remains there for more than 30 seconds, the filtration system enters self-cleaning operation.

2. The working method of the self-cleaning ceramic slurry filtration system as described in claim 1, characterized in that, Step S3 includes the following steps: Step S3.1: Open the valve of the feed port (1) and close the valve of the cleaning outlet (3). The cleaning agent enters the inner cylinder (5) through the feed port (1). Step S3.2: When the liquid level of the cleaning agent reaches the position of the first liquid level sensor (13), close the valve of the feed port (1), the ultrasonic generator continues to work, and when the set value is reached, open the valve of the cleaning outlet (3), and the slurry is discharged from the cleaning outlet (3); Step S3.3: Repeat steps S3.1 and S3.2 N times to begin the filtering process.

3. The working method of the self-cleaning ceramic slurry filtration system as described in claim 1, characterized in that, Multiple outflow holes (16) are provided, and the multiple outflow holes (16) are evenly arranged around the outer wall of the inner cylinder (5).

4. The working method of the self-cleaning ceramic slurry filtration system as described in claim 1, characterized in that, The outer cylinder (9) is mounted on the base (11), and a spring (10) is mounted on the bottom of the outer cylinder (9). One end of the spring (10) is connected to the outer cylinder (9), and the other end of the spring (10) is connected to the base (11). Multiple springs (10) are provided, and the multiple springs (10) are evenly arranged around the bottom of the outer cylinder (9).

5. The working method of the self-cleaning ceramic slurry filtration system as described in claim 1, characterized in that, The top of the inner cylinder (5) is provided with a first sealing cover (4), and the feed inlet (1) is sealed to the first sealing cover (4); The top of the outer cylinder (9) is provided with a second sealing cover (6), and the outer wall of the inner cylinder (5) is sealed to the second sealing cover (6); The bottom of the inner cylinder (5) and the bottom of the outer cylinder (9) are sealed together by a cleaning outlet (3). A sealing ring is provided at the bottom of the outer cylinder (9). A thread (17) is provided on the outer wall of the outlet. The outlet is connected to the bottom thread (17) of the outer cylinder (9).

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