Filtration device and filtration method for aqueous dispersion of solid particles

Abstract

The present invention relates to a filtering device for a solid particle aqueous dispersion and a filtering method thereof. The device comprises a tank body, a filtering unit and an oscillating unit. The tank body comprises a top cover, a bottom cover, and a side wall between the bottom cover and the top cover. The tank body is provided with a feed pipe, a discharge pipe, an air compressor, a pressure gauge and a liquid level gauge. The filtering unit and the oscillating unit are located in the tank body. The oscillating unit is located below the filtering unit. A guide plate is provided in the tank body between the filtering unit and the oscillating unit. The guide plate is used to guide the aqueous dispersion filtered out of the filtering unit into the oscillating unit. The filtering device uses stirring and grinding to break up the large-particle aqueous dispersion, and then uses filter ring filtration and oscillation filtration to remove impurities in the solid particle aqueous dispersion. The present invention has the advantages of simple structure, simple operation, continuous production, high filtration efficiency, and easy cleaning.

Description

Technical Field

[0001] The invention relates to filtering equipment, in particular to filtering equipment and a filtering method for solid particle aqueous dispersion, which are particularly suitable for filtering out large particle substances in solid particle aqueous dispersion. Background Art

[0002] In the production process of aqueous dispersions of solid particles such as water-based color pastes and water-coal slurries, the production is often carried out according to the processes of feeding, dispersing, grinding, testing, and packaging. Impurities in raw materials, large particles such as raw materials that are not fully dispersed can enter semi-finished products and finished products through various channels. In order to further remove large particles and improve the fluidity of aqueous dispersions, it is usually necessary to filter the products during the production process. Generally, when the filtration quality requirements of aqueous dispersions are not high, single-layer or multi-layer filter cloths can be used for filtration. However, in the case of a large number of large particles, this filtration method is easy to clog the filter cloth, and the filter cloth needs to be frequently cleaned or replaced, resulting in poor filtration effect, large workload, and other problems, which seriously affects the quality and efficiency of filtration. How to complete the filtration of aqueous dispersion slurry with simple equipment and remove large particles on the filter material in time is an important link in the production process of aqueous dispersion slurry.

[0003] The Chinese patent application number CN201810019026.9 discloses an efficient slurry raw material filtering device. The filtering device cooperates with the rotating shaft, stirring blades, motor, cam and filter plate. The motor drives the cam to rotate, so that the support plate moves upward, thereby extending the elastic device, and the stirring blade can stir the raw material, so that the filtering device can place more raw materials at one time and reduce the possibility of raw material clogging. Although the device is not easy to clog and has a large processing capacity, it is not convenient to clean and needs to be manually cleaned after stopping. The Chinese patent with application number CN201820681162.X discloses a water-based paint filter residue device, in which the first filter screen and the second filter screen are both arranged in two "V" shapes with intervals up and down, and one end of the two filter screens is connected to the support plate through a spring, and the other end passes through the side wall of the barrel and is fixedly connected to a support rod. The cylinder drives the support rod to swing, and the water-based paint filter residue device can drive the first filter screen and the second filter screen to oscillate and swing continuously, and the swinging solid particles are vibrated into the filter residue box for collection. The bottom surface of the filter residue box is a filter screen, which can also filter the solid particles. The device can collect filter residues, but the filter residue box is inside the device and needs to be taken out and collected regularly, otherwise the filter residue box will be blocked, affecting the filtration efficiency. The filtration efficiency of the filtration equipment disclosed in the above-mentioned prior art is difficult to meet the requirements of industrial production.

[0004] The Korean patent with publication number KR101622368 introduces a water treatment device with filtering and backwashing functions, which can effectively clean the filtering device without disassembling the filter housing. The German patent with publication number DE3905113 introduces a method for cleaning the filter surface, using a slidable spray rod to clean the filter plate with compressed air. Although the filtering devices introduced in these two patents have automatic cleaning functions, the devices disclosed in these two patents are often difficult to work continuously during the filtering of aqueous dispersions with a high content of large particles such as color pastes and water-coal slurries due to the high cleaning frequency. In addition, the equipment is too complicated, which puts great pressure on the maintenance of the equipment. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present invention provides a filtering device for aqueous dispersions of solid particles. The filtering device uses stirring and grinding to further crush large-particle aqueous dispersions, and then uses filter ring filtration and oscillation filtration to remove impurities in the aqueous dispersions of solid particles. The filtering device has a simple structure, a high degree of automation, is not prone to clogging, and has high filtration efficiency.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A filtering device for a solid particle aqueous dispersion, comprising a tank body, a filtering unit and an oscillating unit, wherein the tank body comprises a top cover, a bottom cover, and a side wall located between the bottom cover and the top cover, the tank body is provided with a feed pipe and a discharge pipe, the filtering unit and the oscillating unit are located in the tank body, the oscillating unit is located below the filtering unit, and a guide plate is provided in the tank body between the filtering unit and the oscillating unit, the guide plate is used to guide the aqueous dispersion filtered out of the filtering unit into the oscillating unit;

[0008] Wherein, the filtering unit comprises a stirring shaft, a paddle, a filter ring and a solid plate, the filter ring is fixedly arranged in the tank body, the stirring shaft is located in the filter ring, and its upper end is positioned and connected with the output shaft of the motor 1 and driven to rotate by the motor 1, and a plurality of paddles are fixedly arranged at its lower end, and the angle between the paddle and the horizontal plane is an acute angle, and a plurality of scrapers are arranged below the paddle along the length direction thereof, the solid plate is fixedly arranged in the tank body below the filter ring, and the lower end of the filter ring is tightly fitted to the upper surface of the solid plate, the aqueous dispersion enters the filter ring through the feed pipe and falls on the solid plate, and the scraper is used to grind the slurry on the solid plate;

[0009] Among them, the oscillation unit includes an oscillation box, in which a second filter is provided, the second filter divides the oscillation box into two layers, an upper layer and a lower layer. The two ends of the oscillation box are connected to elastic elements, and the lower end of the oscillation box is connected to motor 2. The oscillation box rotates and oscillates in the tank body under the joint action of motor 2 and the elastic element, and the filtered aqueous dispersion is discharged from the oscillation box to the outside of the tank body through a discharge pipe.

[0010] Preferably, the bottom cover and the side wall are integrally formed, and the top cover is detachably connected to the side wall.

[0011] Preferably, the filter ring includes a first filter screen and a locking ring. The first filter screen is a hollow cylindrical structure with upper and lower openings, and its upper end is fixedly connected to the locking ring. A plurality of circular holes are provided on the locking ring, and the locking ring is detachably fixed to the top cover. The diameter of the mesh holes on the first filter screen is 1 to 5 mm, and the diameter of the first filter screen is smaller than the inner diameter of the tank body.

[0012] Preferably, the stirring shaft is vertically arranged along the central axis of the tank body, the length of the projection of the blade on the horizontal plane is slightly smaller than the diameter of the first filter screen, the angle between the blade and the horizontal plane is ≤30°, the scraper is arranged along the entire length direction of the lower end of the blade, and adjacent scrapers are partially connected, there is a gap between the blade edges and a plurality of through holes are provided on the scraper.

[0013] Preferably, the solid plate includes a plate surface and a plurality of support rods connected to the plate surface at one end and arranged at intervals from each other, the other end of the support rods is fixed to the side wall of the tank body, the plate surface is in the shape of a right circular cone, and the angle between the generatrix of the cone and the horizontal plane is equal to the angle between the blade and the horizontal plane.

[0014] Preferably, the guide plate is obliquely placed in the tank body between the filter unit and the oscillation unit, the upper end of the guide plate is fixed to the side wall of the tank body, and the lower end is a free end and is located directly above the oscillation box.

[0015] Preferably, the outer diameter of the oscillation box is smaller than the inner diameter of the tank body, the second filter is a metal wire mesh, the outer diameter of the second filter is the same as the inner diameter of the oscillation box, and the second filter is fixed to the inside of the oscillation box by a snap, the diameter of the mesh on the second filter is 0.1 to 1 mm, and at least two rollers are provided at the bottom of the oscillation box, which are placed on the bottom cover of the tank body and can roll arbitrarily on the bottom cover.

[0016] Preferably, the elastic element includes a spring, a spring seat and an adjusting knob, the spring is placed in the tank body, one end of the spring is connected to the inner side of the spring seat, the other end of the spring is connected to the outer side of the oscillation box, the spring seat is placed outside the side wall of the box body, and the adjusting knob is fixed to the outer side of the spring seat.

[0017] Preferably, an air compressor, a pressure gauge and a liquid level gauge are provided on the tank body, the feed pipe, motor 1, pressure gauge and liquid level gauge are placed on the top cover of the tank body, the feed pipe is provided with a feed control valve, the air outlet of the air compressor is connected to the tank body, the discharge pipe passes through the bottom cover of the tank body and is connected to the oscillation box, the discharge pipe is provided with a discharge control valve, the motor 2 is arranged on the bottom cover of the tank body, and the feed control valve, discharge control valve, air compressor, pressure gauge, liquid level gauge, motor 1, adjustment knob and motor 2 are all connected to the PLC control system.

[0018] The present invention also provides a filtering method using a filtering device of a solid particle aqueous dispersion, comprising the following steps:

[0019] S1: Set the process parameters of the feed control valve, the discharge control valve, the air compressor, the pressure gauge, the liquid level gauge, the motor 1, the adjustment knob of the elastic element and the motor 2 through the PLC control system;

[0020] S2: The solid particle aqueous dispersion is fed through a feed control valve to control the feed flow rate, enters the tank through a feed pipe, and falls onto a solid plate; the solid particle aqueous dispersion is stirred by a paddle and ground by a scraper, the large particles therein are broken up, and then pass through the filter ring, the remaining large particles cannot pass through, and remain on the solid plate to continue stirring and grinding, and the impurities are also blocked by the filter ring; an air compressor is used to create high pressure to ensure that the filter ring is not easily blocked, a pressure gauge monitors the pressure in the tank to prevent excessive pressure, and a liquid level gauge monitors the liquid level in the tank and synchronously controls the feed flow rate, thus completing the first filtration;

[0021] S3: After passing through the filter ring, the solid particle aqueous dispersion goes down through the guide plate and enters the oscillation box. The oscillation box rotates and oscillates on its horizontal plane under the joint action of the second motor and the elastic element, further refining the solid particle aqueous dispersion; the solid particle aqueous dispersion passes through the second filter in the oscillation box to remove smaller impurities; finally, a solid particle aqueous dispersion product with uniform particle size and no large particles is obtained, and the discharge is controlled by the discharge control valve;

[0022] S4: When the PLC control system detects that the discharge flow rate of the solid particle aqueous dispersion is less than the set flow rate of the discharge control valve, the feed control valve is controlled to stop feeding, and after the discharge is completed, the tank is opened for cleaning;

[0023] S5: Remove the top cover, then take out the filter ring for cleaning, or replace the first filter on the filter ring. After the installation is completed, you can continue filtering.

[0024] The beneficial effects of the present invention are as follows: the filtering equipment of the present application uses stirring and grinding to break up large-particle aqueous dispersions, and large particles and impurities cannot pass through the filter ring. After the solid particle aqueous dispersion passes through the filter ring, oscillation filtration is used to further refine and remove smaller impurities, and the equipment is easy to disassemble and clean. Compared with traditional filtering equipment, the filtering equipment of the present application is not easy to be blocked, is easy to clean, and has a high degree of automation; the filtering method of the present application adopts multiple filtering methods, combined with applying a certain pressure and rotating to generate vortexes for continuous and efficient filtration; the technical solution described in the present application has the advantages of simple structure, easy operation, continuous production, high filtration efficiency, and easy cleaning, and is suitable for the filtration of solid particle aqueous dispersions such as water-based color pastes and water-coal slurries. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the filtering device of the present invention;

[0026] Figure 2 is a top view of a blade according to a specific embodiment of the present invention;

[0027] Figure 3 is a top view of a solid plate according to a specific embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of a scraper blade according to a specific embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of a filter ring according to a specific embodiment of the present invention;

[0030] Figure 6 is a schematic diagram of a single elastic element in the filtering device of the present invention;

[0031] In the figure: 1 tank body; 2 top cover; 3 feed pipe; 4 feed control valve; 5 discharge pipe; 6 discharge control valve; 7 air compressor; 8 pressure gauge; 9 level gauge; 10 motor 1; 11 stirring shaft; 12 blade; 12-1 scraper; 12-2 through hole; 13 filter ring; 13-1 first filter screen; 13-2 locking ring; 13-3 round hole; 14 solid plate; 14-1 plate surface; 14-2 support rod; 15 guide plate; 16 oscillation box; 17 second filter screen; 18 elastic element; 18-1 spring; 18-2 spring seat; 18-3 adjustment knob; 19 roller; 20 motor 2. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0035] This specific embodiment describes in detail a filtering device for solid particle aqueous dispersion. Figure 1 As shown: the filtering device for aqueous dispersion of solid particles comprises a tank body 1, a filtering unit and an oscillating unit, wherein the tank body comprises a top cover 2, a bottom cover, and a side wall located between the bottom cover and the top cover, the tank body 1 is provided with a feed pipe 3, a discharge pipe 5, an air compressor 7, a pressure gauge 8 and a liquid level gauge 9, the filtering unit and the oscillating unit are located in the tank body, the oscillating unit is located below the filtering unit, and a guide plate 15 is provided in the tank body between the filtering unit and the oscillating unit, the guide plate is used to guide the aqueous dispersion filtered out of the filtering unit into the oscillating unit;

[0036] Wherein, the filtering unit includes a stirring shaft 11, a paddle 12, a filter ring 13 and a solid plate 14, the filter ring 13 is fixed in the tank body 1, the stirring shaft 11 is located in the filter ring, the stirring shaft 11 is vertically arranged along the central axis direction of the tank body, and its upper end is positioned and connected with the output shaft of the motor 10 and driven to rotate by the motor 1, and a plurality of paddles 12 are fixedly arranged at its lower end, and the angle between the paddle and the horizontal plane is an acute angle, and more preferably, the angle between the paddle and the horizontal plane is ≤30°, and the length of the projection of the paddle 12 on the horizontal plane is slightly smaller than the diameter of the first filter screen 13-1, such as Figure 2 As shown, in this specific embodiment, three blades are provided, the solid plate 14 is fixedly arranged in the tank below the filter ring, and the lower end of the filter ring 13 is closely attached to the upper surface of the solid plate 14, and the aqueous dispersion enters the filter ring 13 through the feed pipe 3 and falls on the solid plate 14. Figure 4 As shown, a plurality of scrapers 12-1 are provided below the blade along its length direction, and the scrapers are used to grind the slurry on the solid plate 14. Specifically, the scrapers 12-1 are provided along the entire length direction of the lower end of the blade, and adjacent scrapers are partially connected. Gaps are provided between the blade edges of the scrapers and a plurality of through holes 12-2 are provided on the scrapers. In this embodiment, the scrapers are arranged in a trapezoidal shape, and two through holes are provided on a single scraper.

[0037] like Figure 3 As shown, the solid plate 14 includes a plate surface 14-1 and a plurality of support rods 14-2 which are connected to the plate surface at one end and are spaced apart from each other. The other end of the support rod is fixed to the side wall of the tank body. The plate surface 14-1 is in the shape of a right cone, and the angle between the generatrix of the cone and the horizontal plane is equal to the angle between the blade 12 and the horizontal plane. In the present embodiment, the angle between the generatrix of the cone and the horizontal plane and the angle between the blade and the horizontal plane are both 15°. Four support rods are arranged on the solid plate.

[0038] like Figure 5 As shown, the filter ring 13 includes a first filter screen 13-1 and a locking ring 13-2. The first filter screen 13-1 is a hollow cylindrical structure with upper and lower openings, and its upper end is fixedly connected to the locking ring. The locking ring 13-2 is provided with a plurality of circular holes 13-3. In this embodiment, four circular holes are provided on the locking ring of the cover. The locking ring is detachably fixed to the top cover 2. The diameter of the mesh holes on the first filter screen is 1 to 5 mm, specifically, the diameter of the mesh holes on the first filter screen is 3 mm. The diameter of the first filter screen is smaller than the inner diameter of the tank body 1.

[0039] In this embodiment, the guide plate 15 is placed obliquely in the tank body between the filter unit and the oscillation unit. The upper end of the guide plate 15 is fixed to the side wall of the tank body, and the lower end is a free end and is located directly above the oscillation box 16. When the aqueous dispersion is thrown out of the filter ring, it falls into the guide plate 15 through the gap between the support rods 14-2. Because the guide plate is inclined, the aqueous dispersion slides directly from the guide plate into the oscillation box 16.

[0040] The oscillation unit includes an oscillation box 16, in which a second filter screen 17 is provided, which divides the oscillation box into two layers, an upper layer and a lower layer. The two ends of the oscillation box are symmetrically connected to elastic elements 18, and the lower end of the oscillation box 16 is connected to a motor 20. The oscillation box rotates and oscillates in the tank body under the joint action of the motor 20 and the elastic element 18, and the filtered aqueous dispersion is discharged from the oscillation box to the outside of the tank body through the discharge pipe 5. The outer diameter of the oscillation box 16 is smaller than the inner diameter of the tank body 1, and the second filter screen 17 is a metal wire mesh, the outer diameter of the second filter screen is the same as the inner diameter of the oscillation box, and the second filter screen is fixed to the inside of the oscillation box by a buckle, and the diameter of the mesh on the second filter screen is 0.1-1 mm. At least two rollers 19 are provided at the bottom of the oscillation box 16, and the rollers are placed on the bottom cover of the tank body and can roll arbitrarily on the bottom cover. In this embodiment, the diameter of the mesh on the second filter screen is 0.5 mm, and two rollers 19 and four elastic elements 18 are provided.

[0041] like Figure 6 As shown, the elastic element 18 includes a spring 18-1, a spring seat 18-2 and an adjusting knob 18-3. The spring is placed in the tank body, and one end of the spring is connected to the inner side of the spring seat, and the other end of the spring is connected to the outer side of the oscillation box 16. The spring seat is placed outside the side wall of the box body, and the adjusting knob is fixed to the outer side of the spring seat.

[0042] In this embodiment, the bottom cover and the side wall are integrally formed, and the top cover 2 is detachably connected to the side wall. The top cover 2 is connected to the side wall by a locking device. After loosening the locking device, the top cover can be removed from the side wall, which is convenient for removing the filter ring 13 in the tank body for cleaning, or replacing the first filter screen 13-1 on the filter ring. The feed pipe 3, motor 10, pressure gauge 8 and liquid level gauge 9 are placed on the top cover of the tank body, the feed pipe is provided with a feed control valve 4, the air outlet of the air compressor 7 is connected to the tank body, the discharge pipe 5 passes through the bottom cover of the tank body and is connected to the oscillation box 16, the discharge pipe is provided with a discharge control valve 6, the motor 2 20 is arranged on the bottom cover of the tank body, the feed control valve 4, the discharge control valve 6, the air compressor 7, the pressure gauge 8, the liquid level gauge 9, the motor 10, the adjustment knob 18-3 and the motor 2 20 are all connected to the PLC control system, the PLC control system is mainly used for the start and shut down of each electrical component in the filtering equipment, the operation of each electrical component according to the set parameters, the processing of various data information, etc. The PLC control system in this application is a common control system in the field of numerical control, and will not be repeated in this application. The PLC control system can make the setting of process parameters more accurate and convenient, monitor the pressure and liquid level inside the equipment in real time, and appropriately adjust the corresponding parameters to maintain stable filtration.

[0043] The filtering process of the present invention comprises the following steps:

[0044] S1: Set the process parameters of the feed control valve 4, the discharge control valve 6, the air compressor 7, the pressure gauge 8, the liquid level gauge 9, the motor 1 10, the adjustment knob 18-3 of the elastic element and the motor 2 20 through the PLC control system;

[0045] S2: The solid particle aqueous dispersion is fed with a feed control valve 4 to control the feed flow rate, enters the tank through the feed pipe 3, and falls onto the solid plate 14; the solid particle aqueous dispersion is stirred by the blade 12 and ground by the scraper 12-1, the large particles therein are broken, and then pass through the filter ring 13, the remaining large particles cannot pass through, and remain on the solid plate to continue stirring and grinding, and the impurities are also blocked by the filter ring; the air compressor 7 is used to create high pressure to ensure that the filter ring is not easily blocked, the pressure gauge 8 monitors the pressure in the tank to prevent excessive pressure, and the liquid level gauge 9 monitors the liquid level in the tank and synchronously controls the feed flow rate, thus completing the first filtration;

[0046] S3: The solid particle aqueous dispersion passes through the filter ring 13 and then goes down through the guide plate 15 into the oscillation box 16. The oscillation box rotates and oscillates on its horizontal plane under the joint action of the motor 20 and the elastic element 18 to further refine the solid particle aqueous dispersion. The solid particle aqueous dispersion passes through the second filter 17 in the oscillation box to remove smaller impurities. Finally, a solid particle aqueous dispersion product with uniform particle size and no large particles is obtained, and the discharge is controlled by the discharge control valve.

[0047] S4: When the PLC control system detects that the discharge flow rate of the solid particle aqueous dispersion is less than the set flow rate of the discharge control valve, the feed control valve is controlled to stop feeding, and the tank is opened for cleaning after the discharge is completed;

[0048] S5: Remove the top cover, then take out the filter ring 13 for cleaning, or replace the first filter screen 13-1 on the filter ring. After the installation is completed, continue filtering.

[0049] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A filtering device for aqueous dispersion of solid particles, characterized in that: The invention comprises a tank body (1), a filtering unit and an oscillating unit, wherein the tank body comprises a top cover (2), a bottom cover and a side wall located between the bottom cover and the top cover, the tank body (1) is provided with a feeding pipe (3) and a discharging pipe (5), the filtering unit and the oscillating unit are located in the tank body, the oscillating unit is located below the filtering unit, and a guide plate (15) is provided in the tank body between the filtering unit and the oscillating unit, the guide plate being used to guide the aqueous dispersion filtered out of the filtering unit into the oscillating unit; The filtering unit comprises a stirring shaft (11), a paddle (12), a filter ring (13) and a solid plate (14); the filter ring (13) is fixedly arranged in the tank body (1); the stirring shaft (11) is located in the filter ring, and its upper end is positioned and connected to the output shaft of a motor (10) and driven to rotate by the motor; a plurality of paddles (12) are fixedly arranged at its lower end, and the angle between the paddle and the horizontal plane is an acute angle; a plurality of scrapers (12-1) are arranged below the paddle along the length direction of the paddle; the solid plate (14) is fixedly arranged in the tank body below the filter ring, and the lower end of the filter ring (13) is tightly fitted to the upper surface of the solid plate (14); The oscillation unit comprises an oscillation box (16), a second filter screen (17) is arranged in the oscillation box, the second filter screen divides the oscillation box into an upper layer and a lower layer, both ends of the oscillation box are connected to an elastic element (18), the lower end of the oscillation box (16) is connected to a second motor (20), and the oscillation box performs rotational oscillation in the tank body under the combined action of the second motor (20) and the elastic element (18); The filter ring (13) comprises a first filter screen (13-1) and a locking ring (13-2); the first filter screen (13-1) is a hollow cylindrical structure with upper and lower openings, and the upper end of the first filter screen is fixedly connected to the locking ring; the locking ring (13-2) is provided with a plurality of circular holes (13-3); the locking ring is detachably fixed to the top cover (2); the diameter of the mesh holes on the first filter screen is 1 to 5 mm, and the diameter of the first filter screen is smaller than the inner diameter of the tank body (1).

2. The filtering device for aqueous dispersion of solid particles according to claim 1, characterized in that: The bottom cover and the side wall are integrally formed, and the top cover (2) is detachably connected to the side wall.

3. The filtering device for aqueous dispersion of solid particles according to claim 1, characterized in that: The stirring shaft (11) is vertically arranged along the central axis direction of the tank body, the length of the projection of the blade (12) on the horizontal plane is less than the diameter of the first filter screen (13-1), the angle between the blade and the horizontal plane is ≤30°, the scraper (12-1) is arranged along the entire length direction of the lower end of the blade, and adjacent scrapers are partially connected, gaps are provided between the blade edges of the scraper, and a plurality of through holes (12-2) are provided on the scraper.

4. The filtering device for aqueous dispersion of solid particles according to claim 1, characterized in that: The solid plate (14) comprises a plate surface (14-1) and a plurality of support rods (14-2) spaced apart from each other and connected to the plate surface at one end, the other end of the support rods being fixed to the side wall of the tank body, the plate surface (14-1) being in the shape of a right circular cone, and the angle between the generatrix of the cone and the horizontal plane is equal to the angle between the blade (12) and the horizontal plane.

5. The filtering device for aqueous dispersion of solid particles according to claim 1, characterized in that: The guide plate (15) is obliquely placed in the tank body between the filter unit and the oscillation unit. The upper end of the guide plate (15) is fixed to the side wall of the tank body, and the lower end is a free end and is located directly above the oscillation box (16).

6. The filtering device for aqueous dispersion of solid particles according to claim 1, characterized in that: The outer diameter of the oscillation box (16) is smaller than the inner diameter of the tank body (1); the second filter screen (17) is a metal wire mesh; the outer diameter of the second filter screen is the same as the inner diameter of the oscillation box, and the second filter screen is fixed to the inside of the oscillation box by means of a buckle; the diameter of the mesh on the second filter screen is 0.1 to 1 mm; at least two rollers (19) are provided at the bottom of the oscillation box (16); the rollers are placed on the bottom cover of the tank body and can roll arbitrarily on the bottom cover.

7. The filtering device for aqueous dispersion of solid particles according to claim 6, characterized in that: The elastic element (18) comprises a spring (18-1), a spring seat (18-2) and an adjusting knob (18-3); the spring is placed inside the tank, one end of the spring is connected to the inside of the spring seat, the other end of the spring is connected to the outside of the oscillation box (16), the spring seat is placed outside the side wall of the box, and the adjusting knob is fixed to the outside of the spring seat.

8. The filtering device for aqueous dispersion of solid particles according to claim 1, characterized in that: The tank body (1) is provided with an air compressor (7), a pressure gauge (8) and a liquid level gauge (9); the feed pipe (3), motor 1 (10), pressure gauge (8) and liquid level gauge (9) are placed on the top cover of the tank body; the feed pipe is provided with a feed control valve (4); the air outlet of the air compressor (7) is connected to the tank body; the discharge pipe (5) passes through the bottom cover of the tank body and is connected to the oscillation box (16); the discharge pipe is provided with a discharge control valve (6); the motor 2 (20) is arranged on the bottom cover of the tank body; the feed control valve (4), the discharge control valve (6), the air compressor (7), the pressure gauge (8), the liquid level gauge (9), the motor 1 (10), the adjustment knob (18-3) and the motor 2 (20) are all connected to a PLC control system.

9. A filtering method using the filtering device of the solid particle aqueous dispersion according to any one of claims 1 to 8, characterized in that: The steps include: S1: Set the process parameters of the feed control valve, the discharge control valve, the air compressor, the pressure gauge, the liquid level gauge, the motor 1, the adjustment knob of the elastic element and the motor 2 through the PLC control system; S2: The solid particle aqueous dispersion is fed through a feed control valve to control the feed flow rate, enters the tank through a feed pipe, and falls onto a solid plate; the solid particle aqueous dispersion is stirred by a paddle and ground by a scraper, the large particles therein are broken up, and then pass through the filter ring, the remaining large particles cannot pass through, and remain on the solid plate to continue stirring and grinding, and the impurities are also blocked by the filter ring; an air compressor is used to create high pressure to ensure that the filter ring is not easily blocked, a pressure gauge monitors the pressure in the tank to prevent excessive pressure, and a liquid level gauge monitors the liquid level in the tank and synchronously controls the feed flow rate, thus completing the first filtration; S3: After passing through the filter ring, the solid particle aqueous dispersion goes down through the guide plate and enters the oscillation box. The oscillation box rotates and oscillates on its horizontal plane under the joint action of the second motor and the elastic element, further refining the solid particle aqueous dispersion; the solid particle aqueous dispersion passes through the second filter in the oscillation box to remove smaller impurities; finally, a solid particle aqueous dispersion product with uniform particle size and no large particles is obtained, and the discharge is controlled by the discharge control valve; S4: When the PLC control system detects that the discharge flow rate of the solid particle aqueous dispersion is less than the set flow rate of the discharge control valve, the feed control valve is controlled to stop feeding, and the tank is opened for cleaning after the discharge is completed; S5: Remove the top cover, then take out the filter ring for cleaning, or replace the first filter on the filter ring. After the installation is completed, you can continue filtering.

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