Supercritical micro-nano particle preparation equipment

Abstract

The utility model relates to supercritical micro-nano particle preparation equipment which is applied to the technical field of polymer composite material production, and realizes that a material receiving barrel is firstly placed under a screening device, then an electromagnetic valve is controlled to be opened, so that micro-nano particles in a granulator fall on a coarse filter frame in the screening device through a blanking hopper, and the micro-nano particles in the granulator fall on the coarse filter frame in the screening device. At the moment, a micro servo motor is started to drive a rotating shaft to rotate left and right in a small range, a coarse filtering frame slightly swings and shakes, meanwhile, a connecting shaft and the rotating shaft are fixedly connected through a threaded rod by a fine filtering frame, and therefore the coarse filtering frame drives the fine filtering frame to synchronously shake for layered screening; in the shaking process, the rough filtering frame and the fine filtering frame can be prevented from impacting and damaging the inner wall of the screening device through the protective pad, so that micro-nano particles falling on the rough filtering frame can be shaken and filtered at the same time, stone balls in the rough filtering frame and the fine filtering frame are driven to roll and roll the micro-nano particles in the shaking process, and the situation that large aggregates are formed due to aggregation is avoided; therefore, screening cannot be performed.

Description

Technical Field

[0001] This utility model relates to a supercritical micro / nanoparticle preparation device, and in particular to a supercritical micro / nanoparticle preparation device applied to the field of polymer composite material production technology. Background Technology

[0002] In the preparation of supercritical micro and nanoparticles, the solute is first dissolved in a suitable solvent to form a solution, which is then transported by a high-pressure pump. At the same time, the supercritical fluid (usually supercritical carbon dioxide) is also prepared according to the process and reaches the supercritical state. The two are mixed in a high-pressure mixer and then enter the reactor to maintain the supercritical state. Then, the solution expands rapidly through a nozzle, and the solute precipitates out due to the sharp decrease in solubility, forming micro and nanoparticles in the expansion chamber, which are finally collected.

[0003] Chinese patent CN216001053U discloses a granulation device for producing polymer nanocomposite materials, comprising: a main body; a feed seat disposed at the upper end of the main body; and a storage seat installed at the upper end of the main body and located on one side of the feed seat. This invention achieves particle screening by setting a moving mechanism. A drive motor rotates, causing a cam to rotate. One end of the cam contacts and pushes the moving seat. The movement of the moving seat causes a filter screen holder and a spring seat to move, compressing the spring seat. When the other end of the cam rotates to a position on one side of the moving seat, the moving seat moves back to its initial position. This movement causes the filter screen holder to move again. Affected by the sieving motion of the filter screen holder, smaller particles fall through the filter screen holder into a first collection box for collection, while larger particles remain at the upper end of the filter screen holder, thus achieving the particle screening function.

[0004] After granulation, nanoparticle preparation devices need to sieve and collect the particles. However, existing micro and nanoparticles have a large specific surface area, high surface energy, and strong interparticle forces such as van der Waals forces, which easily lead to agglomeration and the formation of large agglomerates, resulting in inaccurate sieving results. Summary of the Invention

[0005] The technical problem that this utility model aims to solve in view of the above-mentioned prior art is that existing micro and nano particles have a large specific surface area, high surface energy, and strong interparticle van der Waals forces, which easily lead to agglomeration and the formation of large agglomerates, resulting in inaccurate sieving results.

[0006] To address the aforementioned problems, this utility model provides a supercritical micro / nanoparticle preparation device, including a support frame, a granulator fixedly connected to the support frame, a hopper fixedly connected to the bottom of the granulator, a sieve detachably connected to the bottom of the hopper, a receiving hopper placed at the bottom of the sieve, a retaining ring fitted around the bottom outer ring of the sieve, and the sieve sealingly engaging with the receiving hopper via the retaining ring, a cover detachably connected to the top of the sieve via screws, a circular hole in the center of the cover matching the bottom of the hopper, and the hopper sealingly engaging with the circular hole, and two sets of symmetrically chiseled grooves on the inner wall of the sieve. The perforated sieve is equipped with coarse and fine filter frames installed symmetrically at the top and bottom. The coarse filter frame is rotatably connected to the perforation at the top via a rotating shaft, and the fine filter frame is rotatably connected to the perforation at the bottom via a connecting shaft. Both the rotating shaft and the connecting shaft have corresponding screw holes with threaded rods inserted into them. The rotating shaft and the connecting shaft are fixed together by the threaded rods and nuts. A support plate is fixedly connected to the side of the sieve, and a micro servo motor is fixedly connected to the support plate. The output end of the micro servo motor is connected to one of the rotating shafts. Multiple stone balls are connected to the inner walls of both the coarse and fine filter frames by pull ropes.

[0007] In the aforementioned micro-nanoparticle preparation equipment, by setting coarse and fine filter frames, micro-nanoparticles can be sieved in layers. During the sieving process, the shaking of the coarse and fine filter frames in conjunction with the stone balls can prevent mesh blockage and particle agglomeration.

[0008] As a further improvement of this application, the diameter of the coarse filter frame is smaller than that of the fine filter frame, and the diameters of both the coarse and fine filter frames are smaller than the inner diameter of the sieve separator. Furthermore, protective pads are symmetrically fixedly connected to the top of the surface of the coarse filter frame and the bottom of the surface of the fine filter frame.

[0009] As a further improvement to this application, a trolley with casters is placed under the receiving bin. Telescopic rods are fixedly connected to the four corners of the top of the trolley, and a lifting plate is fixedly connected to the top of the telescopic rods. A handle is fixedly connected to the side of the top of the lifting plate.

[0010] As a further improvement of this application, compression springs are fitted on the surface of the telescopic rods, and the two ends of the compression springs are fixedly connected to the lifting plate and the trolley, respectively.

[0011] As another improvement of this application, limit holes are symmetrically drilled at the close proximity of the fixed end and the movable end of the telescopic rod, and a limit rod is inserted into the limit hole, passing through the movable end and the fixed end of the telescopic rod.

[0012] As a further improvement to this application, a solenoid valve is installed at the bottom of the hopper, and the diameter of the bottom of the hopper is smaller than the diameter of the coarse filter frame.

[0013] As a further improvement to this application, a controller for controlling the pellet mill, solenoid valve, and micro servo motor is fixedly connected to the support frame.

[0014] In summary, the receiving hopper is first placed directly below the screener. Then, the solenoid valve is opened by control, allowing the micro-nano particles in the granulator to fall onto the coarse filter frame inside the screener through the feed hopper. At this time, the micro servo motor is activated by the controller to drive the rotating shaft to rotate slightly left and right, causing the coarse filter frame to sway gently. Simultaneously, the fine filter frame is fixed to the rotating shaft via a threaded rod, causing the coarse and fine filter frames to sway synchronously for stratified screening. During the swaying, the protective pads prevent the coarse and fine filter frames from impacting and damaging the inner wall of the screener. This allows the micro-nano particles falling onto the coarse filter frame to be filtered while being shaken, preventing clogging. Since the diameter of the coarse filter frame is smaller than that of the fine filter frame, it ensures that all the particles on the coarse filter frame fall into the fine filter frame during rotation. Furthermore, the swaying causes the stone balls inside the coarse and fine filter frames to roll, pressing the micro-nano particles and preventing them from forming large agglomerates that would prevent them from being separated. Attached Figure Description

[0015] Figure 1 These are isometric views of the micro / nano particle granulation equipment according to the first and second embodiments of this application;

[0016] Figure 2 This is a schematic diagram of the sieve structure according to the first embodiment of this application;

[0017] Figure 3 This is a schematic diagram of the installation of the hopper and the screener according to the first embodiment of this application;

[0018] Figure 4 This is a schematic diagram of the internal structure of the sieve according to the first embodiment of this application;

[0019] Figure 5 This is a schematic diagram of the trolley structure according to the second embodiment of this application;

[0020] Figure 6 This is a schematic diagram of the telescopic rod structure according to the second embodiment of this application.

[0021] Explanation of the labels in the diagram:

[0022] 1. Support frame; 2. Granulator; 3. Feed hopper; 4. Screener; 5. Collection bucket; 6. Trolley; 7. Lifting plate; 8. Handle; 9. Casters; 10. Cover; 11. Miniature servo motor; 12. Rotating shaft; 13. Coarse filter frame; 14. Protective pad; 15. Stone ball; 16. Connecting shaft; 17. Fine filter frame; 18. Threaded rod; 19. Telescopic rod; 20. Compression spring; 21. Limiting hole; 22. Limiting rod; 23. Pull rope. Detailed Implementation

[0023] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] First implementation method:

[0025] Figure 1-4 This invention discloses a supercritical micro / nanoparticle preparation device, comprising a support frame 1, a granulator 2 fixedly connected to the support frame 1, a hopper 3 fixedly connected to the bottom of the granulator 2, a sieve 4 detachably connected to the bottom of the hopper 3, a receiving hopper 5 placed at the bottom of the sieve 4, a retaining ring fitted around the bottom outer ring of the sieve 4, and the sieve 4 being sealed and engaged with the receiving hopper 5 by the retaining ring, a cover 10 detachably connected to the top of the sieve 4 by screws, the cover 10 having a circular hole in the middle that matches the bottom of the hopper 3, and the hopper 3 being sealed and engaged with the circular hole, two sets of perforations symmetrically carved on the inner wall of the sieve 4, and coarse filters symmetrically installed inside the sieve 4. The coarse filter frame 13 and the fine filter frame 17 are connected. The coarse filter frame 13 is rotatably connected to the through hole in the upper position through the rotating shaft 12, and the fine filter frame 17 is rotatably connected to the through hole in the lower position through the connecting shaft 16. The rotating shaft 12 and the connecting shaft 16 are provided with corresponding screw holes, and threaded rods 18 are inserted into the screw holes. The rotating shaft 12 and the connecting shaft 16 are fixed with nuts through the threaded rods 18. A support plate is fixedly connected to the side of the screener 4. A micro servo motor 11 is fixedly connected to the support plate, and the output end of the micro servo motor 11 is connected to one of the rotating shafts 12. Multiple stone balls 15 are connected to the inner walls of the coarse filter frame 13 and the fine filter frame 17 through pull ropes 23.

[0026] The diameter of the coarse filter frame 13 is smaller than that of the fine filter frame 17, and the diameters of both the coarse filter frame 13 and the fine filter frame 17 are smaller than the inner diameter of the screener 4. Protective pads 14 are symmetrically fixedly connected to the top of the surface of the coarse filter frame 13 and the bottom of the surface of the fine filter frame 17. A solenoid valve is installed in the bottom of the hopper 3, and the bottom diameter of the hopper 3 is smaller than that of the coarse filter frame 13. A controller for controlling the granulator 2, the solenoid valve, and the micro servo motor 11 is fixedly connected to the support frame 1.

[0027] Working principle: First, the receiving hopper 5 is placed directly below the screener 4. Then, the solenoid valve is opened by control, allowing the micro-nano particles in the granulator 2 to fall onto the coarse filter frame 13 in the screener 4 through the feeding hopper 3. At this time, the micro servo motor 11 is activated by the controller to drive the rotating shaft 12 to rotate slightly left and right, causing the coarse filter frame 13 to sway gently. Simultaneously, the fine filter frame 17 is fixedly connected to the rotating shaft 12 via the threaded rod 18, thereby causing the coarse filter frame 13 and the fine filter frame 17 to sway synchronously for stratified screening. During shaking, the protective pad 14 can prevent the coarse filter frame 13 and the fine filter frame 17 from impacting the inner wall of the separator 4 and causing damage. This allows the micro-nano particles falling on the coarse filter frame 13 to be filtered while shaking, avoiding clogging. Since the diameter of the coarse filter frame 13 is smaller than that of the fine filter frame 17, it can ensure that all the particles on the coarse filter frame 13 can fall into the fine filter frame 17 during rotation. Furthermore, the shaking causes the stone balls 15 inside the coarse filter frame 13 and the fine filter frame 17 to roll and press the micro-nano particles, preventing them from forming large agglomerates that would prevent them from being separated.

[0028] By setting coarse filter frame 13 and fine filter frame 17, micro and nano particles can be screened in layers. During the screening process, the shaking of coarse filter frame 13 and fine filter frame 17, combined with the stone ball 15, can prevent the phenomenon of mesh blockage and particle agglomeration.

[0029] Second implementation method:

[0030] Figure 1 and Figure 5-6 The diagram shows a trolley 6 with casters 9 placed below the receiving bin 5. Telescopic rods 19 are fixedly connected to the four corners of the top of the trolley 6. A lifting plate 7 is fixedly connected to the top of the telescopic rods 19. A handle 8 is fixedly connected to the side of the top of the lifting plate 7. Compression springs 20 are fitted on the surface of the telescopic rods 19, and the two ends of the compression springs 20 are fixedly connected to the lifting plate 7 and the trolley 6 respectively. Limiting holes 21 are symmetrically drilled at the fixed end and the movable end of the telescopic rods 19 when they are close to each other. A limiting rod 22 is inserted into the limiting hole 21, passing through the movable end and the fixed end of the telescopic rod 19.

[0031] Working principle: Before screening micro and nano particles, place the receiving bucket 5 on the lifting plate 7 and push it directly below the screener 4 by holding the handle 8. At this time, the receiving bucket 5 is locked and sealed with the screener 4 by the compression spring 20 and the telescopic rod 19 to prevent particles from falling. After locking, the limiting rod 22 can be inserted into the limiting hole 21 to position the telescopic rod 19. After screening, since the receiving bucket 5 is filled with particles, after pulling out the limiting rod 22, the telescopic rod 19 will automatically retract under the gravity of the receiving bucket 5, and the receiving bucket 5 can be easily pulled out from the bottom of the screener 4.

[0032] The height of the receiving hopper 5 can be adjusted by setting the lifting plate 7, so that it can be sealed and locked with the screener 4 to prevent particles from falling.

[0033] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A supercritical micro / nanoparticle preparation device, comprising a support frame (1), characterized in that: A granulator (2) is fixedly connected to the support frame (1). A hopper (3) is fixedly connected to the bottom of the granulator (2). A sieve (4) is detachably connected to the bottom of the hopper (3). A receiving bucket (5) is placed at the bottom of the sieve (4). A retaining ring is fitted around the bottom of the sieve (4), and the sieve (4) is sealed and engaged with the receiving bucket (5) through the retaining ring. A cover (10) is detachably connected to the top of the sieve (4) by screws. A round hole matching the bottom of the hopper (3) is opened in the middle of the cover (10), and the hopper (3) is sealed and engaged with the round hole. Two sets of perforations are symmetrically carved on the inner wall of the sieve (4). A coarse filter frame (13) and a fine filter frame (14) are symmetrically installed inside the sieve (4). 7), and the coarse filter frame (13) is rotatably connected to the perforation in the upper position through the rotating shaft (12), and the fine filter frame (17) is rotatably connected to the perforation in the lower position through the connecting shaft (16). The rotating shaft (12) and the connecting shaft (16) are both provided with corresponding screw holes. A threaded rod (18) is inserted into the screw hole, and the rotating shaft (12) and the connecting shaft (16) are fixed with a nut through the threaded rod (18). A support plate is fixedly connected to the side end of the sieve (4), and a micro servo motor (11) is fixedly connected to the support plate. The output end of the micro servo motor (11) is connected to one of the rotating shafts (12). The inner walls of the coarse filter frame (13) and the fine filter frame (17) are connected with multiple stone balls (15) through the pull rope (23).

2. The supercritical micro / nanoparticle preparation equipment according to claim 1, characterized in that: The diameter of the coarse filter frame (13) is smaller than that of the fine filter frame (17), and the diameters of both the coarse filter frame (13) and the fine filter frame (17) are smaller than the inner diameter of the sieve separator (4). Protective pads (14) are symmetrically fixedly connected to the top of the surface of the coarse filter frame (13) and the bottom of the surface of the fine filter frame (17).

3. The supercritical micro / nanoparticle preparation equipment according to claim 1, characterized in that: A trolley (6) with casters (9) is placed below the receiving bin (5). Telescopic rods (19) are fixedly connected to the four corners of the top of the trolley (6). A lifting plate (7) is fixedly connected to the top of the telescopic rods (19). A handle (8) is fixedly connected to the side of the top of the lifting plate (7).

4. The supercritical micro / nanoparticle preparation equipment according to claim 3, characterized in that: The telescopic rod (19) is fitted with compression springs (20) on its surface, and the two ends of the compression springs (20) are fixedly connected to the lifting plate (7) and the trolley (6) respectively.

5. The supercritical micro / nanoparticle preparation equipment according to claim 3, characterized in that: The fixed end and the movable end of the telescopic rod (19) are symmetrically drilled with limiting holes (21) at their close proximity. A limiting rod (22) that passes through the movable end and the fixed end of the telescopic rod (19) is inserted into the limiting hole (21).

6. The supercritical micro / nanoparticle preparation equipment according to claim 1, characterized in that: A solenoid valve is installed at the bottom of the hopper (3), and the bottom diameter of the hopper (3) is smaller than the diameter of the coarse filter frame (13).

7. The supercritical micro / nanoparticle preparation equipment according to claim 1, characterized in that: The support frame (1) is fixedly connected to a controller that controls the pellet mill (2), solenoid valve and micro servo motor (11).

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