A high-efficiency superfine dry particle screening device capable of reducing dry particle aggregation

Abstract

The application belongs to the technical field of superfine dry particle production, and particularly relates to a high-efficiency superfine dry particle screening device capable of reducing dry particle agglomeration, which comprises an outer casing, a raw material tank at the top of the outer casing, a communication outer filter cylinder through a discharge pipe, an inner filter cylinder installed in the outer filter cylinder, a spiral plate arranged outside the inner filter cylinder, the inner filter cylinder being communicated with one end of a hollow pipe motor output shaft, the hollow pipe motor output shaft being rotatably connected with a compressed air pipeline, an ultrasonic transducer being installed on the outer filter cylinder, a first filter section and a second filter section being sequentially formed on the surface of the outer filter cylinder and being provided with a partition plate, the bottom end of the partition plate being connected with a V-shaped sieve water plate, and an electromagnetic liquid discharge valve being installed at the bottom of the outer casing. The positive pressure airflow and the ultrasonic transducer continuously generate vortexes in the process of slurry delivery, effectively reducing the particle agglomeration phenomenon in the dispersant, effectively reducing the rigid collision compared with mechanical stirring, and effectively improving the sieving speed by increasing the pressure in the outer filter cylinder.

Description

Technical Field

[0001] This invention belongs to the field of ultrafine dry particle production technology, specifically relating to an efficient ultrafine dry particle screening device that can reduce dry particle agglomeration. Background Technology

[0002] The dry granules currently used on ceramic tile surfaces are mainly concentrated in the D50 size range of 40-125 micrometers. Dry granules in this size range can be called ultrafine dry granules. In order to ensure the sintering effect of ceramic tiles, it is necessary to remove dry granules in the dry powder that exceed the upper and lower limits.

[0003] In existing technologies, various types of ultrafine dry particle screening equipment, including dry powder screening and slurry screening, all suffer from ultrafine powder agglomeration. During the screening process, the agglomeration of ultrafine powder mainly affects the slurry screening effect in the following two aspects: 1. Reduced screening efficiency: Agglomeration causes particles to cluster into larger clumps. These clumps may not be able to pass through the pores of the screen and thus remain on the screen. This not only reduces screening efficiency but may also increase the risk of screen clogging, further affecting the screening process; 2. Affected screening yield: Agglomeration may cause fine particles that should be screened to be encased in larger clumps, thus preventing them from passing through the screen. Currently, using chemical dispersants combined with mechanical dispersion is a common method to reduce particle agglomeration in slurry. However, mechanical stirring inevitably causes particle breakage in the slurry, leading to a decrease in yield. Furthermore, even after mechanical dispersion, particles leaving the agitator vortex or grinder may still agglomerate. Summary of the Invention

[0004] To address the above problems, the present invention aims to provide a highly efficient ultrafine dry particle screening device that can reduce dry particle agglomeration, thereby solving the problem that the screening quality and efficiency of existing ultrafine dry particle slurries are affected by particle agglomeration during the screening process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-efficiency ultrafine dry particle screening device that can reduce dry particle agglomeration, comprising an outer casing, a raw material trough at the top of the outer casing, an outer filter cylinder at the bottom of the raw material trough being connected to the outer filter cylinder via a feed pipe, an inner filter cylinder being rotatably mounted on the inner side of the outer filter cylinder, a spiral plate being provided on the outer side of the inner filter cylinder, one end of the inner filter cylinder being connected to one end of the output shaft of a hollow tube motor, the other end of the output shaft of the hollow tube motor being rotatably connected to a compressed air pipeline, an ultrasonic transducer being installed on the outer filter cylinder, and the outer filter... The surface of the cylinder is provided with a first filter section and a second filter section in sequence from the end near the feed pipe to the end away from the feed pipe. The outer filter cylinder at the rear end of the first filter section and the second filter section is provided with a partition plate. The bottom end of the partition plate is connected to a V-shaped water sieve plate. A feeding auger is installed at the bottom of the V-shaped water sieve plate. A discharge valve is installed at one end of the feeding auger. A first collection trough, a second collection trough, and a third collection trough are formed between the three sets of partition plates, the V-shaped water sieve plate and the inner wall of the outer casing. An electromagnetic discharge valve is installed at the bottom of the outer casing.

[0006] The beneficial effects of this invention are as follows: by continuously agitating the slurry with positive pressure airflow during the slurry transport process to generate eddies, and in conjunction with the use of ultrasonic transducers, the agglomeration of particles in the slurry completely immersed in the dispersant is effectively reduced, and the changes in the physical properties of particles caused by rigid collisions caused by mechanical stirring are reduced. At the same time, the increased internal pressure of the external filter cartridge can effectively increase the sieving speed.

[0007] In order to maintain the liquid level inside the outer casing at a suitable height during the screening process, thereby ensuring the anti-agglomeration effect of the device;

[0008] As a further improvement to the above technical solution: a liquid level switch one and a liquid level switch two are installed at intervals inside the outer casing. The installation height of the liquid level switch two is not lower than the top of the outer filter cartridge. The liquid level switch two and the electromagnetic discharge valve are electrically connected to a PLC module.

[0009] The beneficial effects of this improvement are as follows: When slurry is continuously added to the raw material tank for screening, the PLC receives the electrical signal from the level switch two and controls the discharge speed of the electromagnetic discharge valve to avoid the discharging of the material too quickly, which would cause the level of the dispersant and wetting agent solution in the outer casing to be lower than that in the outer filter cartridge, thus affecting the generation of eddies and the oscillation effect of the ultrasonic waves.

[0010] In order to effectively ensure that the material screened out by the external filter cartridge is effectively collected and stored in the first collection tank, the second collection tank, and the third collection tank;

[0011] As a further improvement to the above technical solution: the installation height of the liquid level switch is not higher than the top of the partition plate, and the liquid level switch is electrically connected to a PLC module.

[0012] The beneficial effects of this improvement are as follows: by setting a liquid level switch and then controlling the electromagnetic discharge valve through the PLC module, the liquid level in the outer casing is always lower than the top of the partition plate, thereby preventing the screened material from flowing across the top of the partition plate and affecting the material collection effect.

[0013] In order to effectively prevent materials from settling to the bottom in the raw material tank and thus improve the screening effect;

[0014] As a further improvement to the above technical solution: a reflux agitator is provided at the bottom of the raw material tank. One end of the reflux agitator is connected to the top of the outer casing. The reflux agitator is composed of multiple straight pipes, including straight pipes, and elbows welded together. The straight pipes are arranged parallel to the bottom of the raw material tank and have multiple air outlets.

[0015] The beneficial effects of this improvement are as follows: After the positive pressure airflow is gathered at the top of the outer casing through the outer filter cartridge, it can be collected and returned to the bottom of the raw material tank through the return agitation pipe to agitate the material in the raw material tank, thereby effectively preventing the slurry in the raw material tank from settling to the bottom.

[0016] To effectively prevent dry particles in the slurry in the raw material tank from entering the return blasting pipe;

[0017] As a further improvement to the above technical solution: the air outlet is opened towards the bottom surface of the raw material tank.

[0018] The beneficial effects of this improvement are: the air outlet opening towards the bottom of the raw material tank can effectively reduce the situation where dry particles enter the return blasting tube under the action of gravity, and can more effectively carry out the dry particles that have entered the return blasting tube when the airflow is ejected.

[0019] To effectively prevent dry particles from entering the inner filter cartridge;

[0020] As a further improvement to the above technical solution: the pore size of the uniformly distributed sieve holes on the inner filter cylinder is not greater than the lower limit of the particle size of the microparticles in the slurry.

[0021] The beneficial effect of this improvement is that during the screening operation, the sieve holes on the inner filter cartridge can only allow liquids and gases to pass through, thereby preventing particles from entering the interior of the inner filter cartridge.

[0022] In order to effectively filter the solution and collect the particles;

[0023] As a further improvement to the above technical solution: the aperture of the sieve holes evenly distributed on the V-shaped sieve plate is not greater than the lower limit of the particle size of the particles in the slurry.

[0024] The beneficial effects of this improvement are: the V-shaped water sieve plate allows only slurry and air to pass through, effectively preventing the leakage of particles that could affect the yield.

[0025] To ensure the stability of the inner filter cartridge rotation;

[0026] As a further improvement to the above technical solution: one end of the inner filter cartridge is connected to a connecting shaft, and the connecting shaft is rotatably mounted on the outer casing.

[0027] The beneficial effects of this improvement are: the connecting shaft serves to support the inner filter cartridge, thereby improving the stability of the inner filter cartridge's rotation.

[0028] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0031] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0032] Figure 4 This is a schematic diagram of the structure of the present invention with the outer casing removed;

[0033] Figure 5 This is a schematic diagram of the reflux agitator tube in this invention;

[0034] In the diagram: 1. Outer casing; 2. Raw material tank; 3. Return agitator pipe; 31. Straight pipe; 32. Air outlet; 4. Divider plate; 5. V-shaped water sieve plate; 6. First collection tank; 7. Second collection tank; 8. Third collection tank; 9. Feeding auger; 10. Electromagnetic discharge valve; 11. Outer filter cartridge; 111. First filtration section; 112. Second filtration section; 12. Discharge pipe; 13. Hollow tube motor; 14. Compressed air pipeline; 15. Inner filter cartridge; 16. Spiral plate; 17. Connecting shaft; 18. Discharge valve; 19. Ultrasonic transducer; 20. Level switch one; 21. Level switch two. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0036] Example 1:

[0037] like Figure 1As shown in Figure 5: A high-efficiency ultrafine dry particle screening device that can reduce dry particle agglomeration includes an outer casing 1. A raw material trough 2 is provided on the top of the outer casing 1. The bottom of the raw material trough 2 is connected to an outer filter cylinder 11 via a feed pipe 12. An inner filter cylinder 15 is rotatably mounted on the inner side of the outer filter cylinder 11. A spiral plate 16 is provided on the outer side of the inner filter cylinder 15. One end of the inner filter cylinder 15 is connected to one end of the output shaft of a hollow tube motor 13. The other end of the output shaft of the hollow tube motor 13 is rotatably connected to a compressed air pipeline 14. An ultrasonic transducer 19 is installed on the outer filter cylinder 11. A first filter section 111 and a second filter section 112 are sequentially formed on the surface of the outer filter cylinder 11 from the end near the feed pipe 12 to the end away from the feed pipe 12. A partition plate 4 is provided on the outer filter cylinder 11 at the rear end of the first filter section 111 and the second filter section 112. A V-shaped water screening plate 5 is connected to the bottom end of the partition plate 4. A feeding auger 9 is installed at the bottom of the V-shaped water screening plate 5. A discharge valve 18 is installed at one end of the feeding auger 9. A first collection tank 6, a second collection tank 7, and a third collection tank 8 are formed between the three sets of partition plates 4, the V-shaped water screening plate 5 and the inner wall of the outer casing 1. An electromagnetic discharge valve 10 is installed at the bottom of the outer casing 1. During the slurry transportation process, the slurry is continuously agitated by positive pressure airflow to generate eddies. With the use of an ultrasonic transducer 19, the agglomeration of particles in the slurry completely immersed in the dispersant is effectively reduced, and the rigid collision caused by mechanical stirring is reduced. The change in the physical properties of the particles, while increasing the internal pressure of the outer filter cartridge 11, can effectively increase the screening speed. A level switch 1 20 and a level switch 21 are installed at intervals inside the outer casing 1. The installation height of the level switch 21 is not lower than the top of the outer filter cartridge 11. The level switch 21 and the electromagnetic discharge valve 10 are electrically connected to a PLC module. When slurry is continuously added to the raw material tank 2 for screening, the PLC receives the electrical signal from the level switch 21 and controls the discharge speed of the electromagnetic discharge valve 10. This prevents excessively fast discharge from causing the dispersant and wetting agent solution levels inside the outer casing 1 to fall below the outer filter cartridge 11, thus affecting the generation of eddies and the ultrasonic oscillation effect. The installation height of the level switch 20 is not higher than the partition plate 4. At the top, the liquid level switch 20 is electrically connected to a PLC module. By setting the liquid level switch 20, the PLC module controls the electromagnetic discharge valve 10, ensuring that the liquid level inside the outer casing 1 is always lower than the top of the partition plate 4. This prevents the screened material from overflowing the top of the partition plate 4, thus affecting the material collection effect. A return agitator pipe 3 is installed at the bottom of the raw material tank 2. One end of the return agitator pipe 3 is connected to the top of the outer casing 1. The return agitator pipe 3 is composed of multiple straight pipes and elbows welded together, including a straight pipe 31. The straight pipe 31 is parallel to the bottom of the raw material tank 2 and has multiple air outlets 32. After the positive pressure airflow passes through the outer filter cartridge 11 and gathers at the inner top of the outer casing 1,The material returning to the bottom of the raw material tank 2 can be collected through the return agitation pipe 3, agitating the material in the raw material tank 2 and effectively preventing the slurry in the raw material tank 2 from settling to the bottom. The air outlet 32 ​​is opened towards the bottom surface of the raw material tank 2. The air outlet 32 ​​opened towards the bottom of the raw material tank 2 can effectively reduce the situation where dry particles enter the return agitation pipe 3 under the action of gravity, and can effectively carry out the dry particles that have entered the return agitation pipe 3 when the airflow is sprayed out. The pore size of the screen holes evenly distributed on the inner filter cylinder 15 is not greater than the lower limit of the particle size of the particles in the slurry. During the screening process, the sieve holes on the inner filter cylinder 15 allow only liquid and gas to pass through, thus preventing particles from entering the interior of the inner filter cylinder 15. The sieve holes evenly distributed on the V-shaped water sieve plate 5 have a diameter no larger than the lower limit of the particle size in the slurry. The V-shaped water sieve plate 5 allows only slurry and air to pass through, effectively preventing particle leakage and affecting the yield. One end of the inner filter cylinder 15 is connected to a connecting shaft 17, which is rotatably mounted on the outer casing 1. The connecting shaft 17 supports the inner filter cylinder 15, improving the stability of its rotation.

[0038] The working principle of this technical solution is as follows: First, the valve on the pipeline connected to the compressed air pipeline 14 is opened, and the prepared dispersant and wetting agent solution is poured into the raw material tank 2, so that the liquid level is between the liquid level switch 20 and the liquid level switch 21. Then, the slurry raw material is continuously added to the raw material tank 2 through the controllable filling equipment, and the hollow tube motor 13 and ultrasonic transducer 19 are started. After the hollow tube motor 13 starts, it drives the hollow shaft to rotate the inner filter cylinder 15. When the spiral plate 16 on the outside of the inner filter cylinder 15 rotates, the slurry in the raw material tank 2 is conveyed by the spiral plate 16 through the feed pipe 12 and the outer filter cylinder 11 in sequence. The slurry first passes through the first filtration section 111. At this point, particles with a diameter larger than the pore size of the first filter section 111 in the slurry continue to be transported towards the second filter section 112, while particles with a diameter smaller than the pore size of the first filter section 111 fall through the sieve holes into the first collection tank 6. Particles with a diameter larger than the pore size of the second filter section 112 in the slurry entering the second filter section 112 continue to be transported towards the outlet end of the outer filter cylinder 11 and fall into the third collection tank 8, while particles with a diameter smaller than the pore size of the second filter section 112 fall through the sieve holes into the second collection tank 7. Thus, slurry containing only particles of the qualified diameter is obtained in the second collection tank 7. During the process of the slurry passing through the outer filter cylinder 11, the ultrafiltration membrane attached to the outside of the outer filter cylinder 11... The acoustic transducer 19 generates microbubbles and vortex flow through ultrasonic oscillation, thereby rapidly dispersing particles. Simultaneously, compressed air enters the inner filter cartridge 15 through the compressed air pipeline 14 and the hollow shaft of the hollow tube motor 13, exiting through uniformly distributed micropores on the surface of the inner filter cartridge 15 and entering the outer filter cartridge 11. This rapidly increases the internal pressure of the cavity between the outer and inner filter cartridges 11. This increased internal pressure, on the one hand, generates laminar flow through vortices caused by airflow disturbance, further reducing particle agglomeration; on the other hand, the increased internal pressure increases the sieving speed of the particles, accelerating the sieving effect. After the compressed air is discharged to the outside of the outer filter cartridge 11, it accumulates... At the top of the outer casing 1, the material flows back to the bottom of the raw material tank 2 through the return agitation pipe 3 and is discharged through the air outlet 32, agitating the bottom of the raw material tank 2 to prevent material from settling at the bottom. During the screening process, the PLC module receives electrical signals from the level switch 1 20 and the level switch 21 to control the electromagnetic discharge valve 10, thereby ensuring that the liquid level in the outer casing 1 is never higher than the top of the partition plate 4 and never lower than the top of the outer filter cartridge 11, so as to ensure the screening effect. After screening, all the dispersant and wetting agent solutions filtered by the V-shaped screen plate 5 are released, the discharge valve 18 is opened and the motor of the feeding auger 9 is started to collect the screened material.

[0039] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A highly efficient ultrafine dry particle screening device that can reduce dry particle agglomeration, characterized in that: The system includes an outer casing (1), with a raw material tank (2) at its top. The bottom of the raw material tank (2) is connected to an outer filter cartridge (11) via a feed pipe (12). An inner filter cartridge (15) is rotatably mounted inside the outer filter cartridge (11), and a spiral plate (16) is provided on the outer side of the inner filter cartridge (15). One end of the inner filter cartridge (15) is connected to one end of the output shaft of a hollow tube motor (13), and the other end of the output shaft of the hollow tube motor (13) is rotatably connected to a compressed air pipeline (14). An ultrasonic transducer (19) is mounted on the outer filter cartridge (11), and the surface of the outer filter cartridge (11) extends from one end near the feed pipe (12) to the end away from the feed pipe (12). One end is provided with a first filter section (111) and a second filter section (112) in sequence. The outer filter cylinder (11) at the rear end of the first filter section (111) and the second filter section (112) are provided with a partition plate (4). The bottom end of the partition plate (4) is connected to a V-shaped water sieve plate (5). The bottom of the V-shaped water sieve plate (5) is equipped with a feeding auger (9). One end of the feeding auger (9) is equipped with a discharge valve (18). The three sets of partition plates (4), V-shaped water sieve plates (5) and the inner wall of the outer casing (1) are formed with a first collection tank (6), a second collection tank (7) and a third collection tank (8). The bottom of the outer casing (1) is equipped with an electromagnetic discharge valve (10).

2. The high-efficiency ultrafine dry particle screening device that can reduce dry particle agglomeration according to claim 1, characterized in that: The outer casing (1) is equipped with a liquid level switch one (20) and a liquid level switch two (21) installed at intervals between the upper and lower parts. The installation height of the liquid level switch two (21) is not lower than the top of the outer filter cartridge (11). The liquid level switch two (21) and the electromagnetic discharge valve (10) are electrically connected to a PLC module.

3. The high-efficiency ultrafine dry particle screening device that can reduce dry particle agglomeration according to claim 2, characterized in that: The installation height of the liquid level switch (20) is not higher than the top of the partition plate (4), and the liquid level switch (20) is electrically connected to a PLC module.

4. The high-efficiency ultrafine dry particle screening device that reduces dry particle agglomeration according to claim 1, characterized in that: The bottom of the raw material tank (2) is provided with a return agitation pipe (3). One end of the return agitation pipe (3) is connected to the top of the outer casing (1). The return agitation pipe (3) is composed of multiple straight pipes and elbows, including a straight pipe (31). The straight pipe (31) is set parallel to the bottom of the raw material tank (2). Multiple air outlets (32) are opened on the straight pipe (31).

5. The high-efficiency ultrafine dry particle screening device for reducing dry particle agglomeration according to claim 4, characterized in that: The air outlet (32) is opened towards the bottom surface of the raw material tank (2).

6. The high-efficiency ultrafine dry particle screening device that can reduce dry particle agglomeration according to claim 1, characterized in that: The pore size of the uniformly distributed sieve holes on the inner filter cylinder (15) is not greater than the lower limit of the particle size of the microparticles in the slurry.

7. The high-efficiency ultrafine dry particle screening device according to claim 1, characterized in that: The aperture of the uniformly distributed sieve holes on the V-shaped sieve plate (5) is not greater than the lower limit of the particle size of the microparticles in the slurry.

8. The high-efficiency ultrafine dry particle screening device that reduces dry particle agglomeration according to claim 1, characterized in that: One end of the inner filter cartridge (15) is connected to a connecting shaft (17), which is rotatably mounted on the outer casing (1).

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