Oxide pellet screening forming system

Abstract

The utility model belongs to oxide pellet preparation technical field, concretely relates to a kind of oxide pellet screening forming system.The oxide pellet screening forming system, including drying and crushing cauldron, vibrating screen, pelletizer, drying and crushing cauldron, vibrating screen, pelletizer are sequentially connected by screw feeder, realize material transfer, the feed inlet position of the pelletizer is provided with the pipeline connected with the bonding liquid preparation cauldron, conveying pump is provided on the pipeline, and the pipeline outlet is connected with bonding liquid spray head, for spraying binder.The utility model's oxide pellet screening forming system, by vibrating screen double jacket temperature control and backblow spray head design, cooperate double-layer screen to improve screening efficiency;Pelletizer includes adjustable support, directional spray head and scraper device, guarantee the pellet forming quality;Powder pretreatment is combined with gas purging and vacuum system, reduces pipeline blockage and airflow turbulence, improves system overall operation stability.

Description

Technical Field

[0001] This utility model belongs to the field of oxide microsphere preparation technology, specifically relating to an oxide microsphere sieving and forming system. Background Technology

[0002] Oxide nanospheres, with alumina, silica, and zirconium oxide as core materials, have achieved wide application in various fields due to their high hardness, high temperature resistance, and strong chemical stability. In the petrochemical industry, alumina nanospheres serve as both oil purification adsorbents and catalyst carriers in catalytic cracking processes; silica nanospheres can be used in antireflection films for optical devices, insulating layers for integrated circuits, and carriers for biomedical fluorescent probes; zirconium oxide nanospheres are primarily used in precision polishing applications, suitable for processing high-end parts in aerospace, automotive, and other industries. Meanwhile, various oxide nanospheres also play important roles in environmental wastewater and waste gas treatment, grinding and polishing, and refractory materials.

[0003] Current oxide pellet production often employs segmented equipment for screening and forming. Screening equipment is typically a single-stage vibrating screen, which is prone to screen clogging for oxide raw materials containing trace amounts of moisture or a high proportion of fine powder, resulting in low screening efficiency. Furthermore, the insufficient precision of single-stage screening severely affects the consistency of subsequent forming. Forming equipment often uses a single roller or a simple extrusion structure, with binders added manually based on experience, leading to large dosage errors. Moreover, the forming pressure cannot be dynamically adjusted, resulting in poor compressive strength of the pellets. Some pellets also exhibit burrs, ovals, and other shape defects due to material adhering to the forming cavity wall, making it difficult to improve the product qualification rate.

[0004] CN218133317U discloses a device for improving the strength of granulated aluminum balls. Granulated aluminum balls are fed into the device body through a feed pipe and then screened by multi-stage sieves in a small ball chamber, a discharge chamber, and a large ball chamber. Small balls and large balls that do not meet strength standards are separated. Standard aluminum balls are then decelerated and dispersed by a dispersion plate in the discharge chamber and a baffle plate in the discharge pipe before entering a drying oven. The device is also equipped with auxiliary structures such as guide blocks, transparent windows, and elastic pads, which solve the problem of insufficient strength caused by uneven volume. These auxiliary structures also improve the convenience and safety of operation, reducing the risk of aluminum ball breakage and equipment blockage. However, this device only optimizes the screening of aluminum ball volume and cannot solve strength defects caused by the material itself or the granulation process. Furthermore, the multi-stage screening may reduce material handling efficiency, making it unsuitable for large-scale, rapid production scenarios. Utility Model Content

[0005] To address the problems of low screening efficiency and unstable molding quality in existing technologies, this utility model provides an oxide microsphere screening and molding system.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: An oxide pellet screening and forming system includes a drying and crushing kettle, a vibrating screen, and a pelletizer. The drying and crushing kettle, the vibrating screen, and the pelletizer are connected in sequence by a screw feeder to realize material transfer. The pelletizer includes a disc body and an adjustable support for supporting the disc body. A binder spray nozzle is installed on the support at the disc body and connected to the binder preparation kettle pipeline for spraying binder. A delivery pump is installed on the pipeline.

[0007] Preferably, the vibrating screen has a double-layer jacket structure, with the lower part of the jacket connected to the circulating water pipeline.

[0008] Preferably, the lower part of the vibrating screen is also connected to a backflush air pipeline, and the outlet of the backflush air pipeline is also equipped with a rotatable spherical nozzle; a double-layer screen is installed inside the vibrating screen, and further, the rotatable spherical nozzle is located at the lower part of the double-layer screen, which can clean the fine powder remaining in the screen holes.

[0009] Preferably, the adhesive spray nozzle outlet is directly opposite the disc body, and a scraper device is also installed on the bracket at the disc body. Furthermore, the scraper device is an adjustable intermittent type, controlled by a drive motor to realize the operation of the scraper device. At the same time, the distance between the scraper and the inner wall of the disc body and the scraper angle can be adjusted appropriately. A wear-resistant rubber scraper is added to the bottom of the scraper to scrape off the adhesive material and agglomerated powder adhering to the inner wall, without contacting the small balls being formed, thus avoiding hard contact that could damage the small balls.

[0010] Preferably, the drying and crushing vessel is equipped with a stirrer at the center, and a baffle plate is provided on the inner wall of the vessel, with dispersion holes provided on the baffle plate.

[0011] Preferably, a buffer tank is installed on the pipeline connecting the lower part of the drying crusher to the screw feeder. The upper part of the buffer tank is connected to a gas pipeline. The gas pipeline delivers gas to push the powder into the screw feeder, preventing pipeline blockage. At the same time, after the conveying is completed, the gas can blow away the powder remaining in the screw feeder.

[0012] Preferably, a temporary storage tank is provided on the pipeline connecting the lower part of the vibrating screen to the screw feeder, which can temporarily store the screened powder.

[0013] Preferably, the upper part of the vibrating screen is also connected to the exhaust gas pipeline, and a filter screen is installed at the connection to prevent powder from being blown into the exhaust gas pipeline and affecting subsequent equipment.

[0014] Preferably, the exhaust gas pipeline is connected to the vacuum system, and a pressure buffer tank is installed at the connection point. Furthermore, the vacuum system works in conjunction with the gas pipeline to ensure stable pressure during the powder conveying process. A pressure gauge is installed on the pressure buffer tank to prevent sudden fluctuations in vacuum from causing airflow disturbances in the vibrating screen and affecting the screening effect.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model discloses an oxide sphere screening and forming system. The vibrating screen adopts a double-layer jacketed temperature control and a rotatable spherical back-blowing nozzle design, which, together with the double-layer screen, achieves precise screening and effectively cleans residual fine powder in the screen holes, avoiding clogging and thus effectively improving screening efficiency. Secondly, the sphere forming device is equipped with an adjustable support, a directional binder nozzle, and an adjustable intermittent scraper device, which can not only stably control the binder spraying and the sphere forming environment, but also avoid the scraper from damaging the spheres through hard contact, ensuring stable forming quality. Finally, the powder is pre-treated by crushing, and combined with a gas purging and vacuum system, the problems of pipeline blockage and airflow turbulence are reduced, improving the overall stability of the system operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the oxide ball screening and forming system of this utility model.

[0017] In the diagram: 1. Vibrating screen; 2. Drying and crushing kettle; 201. Baffle plate; 202. Agitator; 3. Pelletizer; 301. Adhesive spray nozzle; 302. Support; 303. Scraper device; 304. Disc; 4. Adhesive preparation kettle; 5. Screw feeder; 6. Backflush air pipeline; 601. Rotatable spherical nozzle; 7. Circulating water pipeline; 8. Conveying pump; 9. Buffer tank; 10. Temporary storage tank; 11. Gas pipeline; 12. Exhaust gas pipeline; 13. Pressure buffer tank; 14. Vacuum system. Detailed Implementation

[0018] The specific technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, the oxide sphere screening and forming system of this utility model includes a drying and crushing kettle 2, a vibrating screen 1, and a sphere forming device 3. The drying and crushing kettle 2, the vibrating screen 1, and the sphere forming device 3 are connected in sequence by a screw feeder 5. The sphere forming device 3 includes a disc body 304 and an adjustable bracket 302 supporting the disc body 304. A binder spray nozzle 301 is installed on the bracket 302 at the disc body 304 and is connected to the binder preparation kettle 4 by a pipeline. A delivery pump 8 is installed on the pipeline. The outlet of the binder spray nozzle 301 is directly opposite the disc body 304. A scraper device 303 is also installed on the bracket 302 at the disc body 304. The scraper device 303 is an adjustable intermittent type, and a wear-resistant rubber scraper is added to the bottom of the scraper.

[0020] The vibrating screen 1 has a double-layer jacket structure, with the lower part of the jacket connected to the circulating water pipeline 7; the lower part of the vibrating screen 1 is also connected to the backflush air pipeline 6, and the outlet of the backflush air pipeline 6 is also equipped with a rotatable spherical nozzle 601; a double-layer screen is installed inside the vibrating screen 1, and the rotatable spherical nozzle 601 is located at the lower part of the double-layer screen.

[0021] A stirrer 202 is provided in the center of the drying and crushing kettle 2, and a baffle plate 201 is provided on the inner wall of the kettle. A dispersion hole is provided on the baffle plate 201. A buffer tank 9 is provided on the pipeline connected to the screw feeder 5 at the bottom of the drying and crushing kettle 2. The upper part of the buffer tank 9 is connected to the gas pipeline 11.

[0022] A temporary storage tank 10 is installed on the pipeline connecting the lower part of the vibrating screen 1 to the screw feeder 5; the upper part of the vibrating screen 1 is also connected to the exhaust gas pipeline 12, and a filter screen is installed at the connection; the exhaust gas pipeline 12 is connected to the vacuum system 14, and a pressure buffer tank 13 is installed at the connection, and a pressure gauge is installed on the pressure buffer tank 13.

[0023] The oxide microsphere screening and forming system described herein operates as follows: First, the material enters the drying and crushing kettle 2, where it undergoes pre-crushing under the stirring action of the agitator 202 and the dispersing action of the baffle plate 201. The dispersing holes on the baffle plate 201 further enhance the uniformity of material dispersion. The drying and crushing kettle 2 is equipped with a temperature control system to heat the material and reduce its water content. The pre-treated material is then transported to the buffer tank 9 via the lower pipeline of the drying and crushing kettle 2. The gas pipeline 11, in conjunction with the vacuum system 14, pushes the powder into the screw feeder 5 while ensuring stable system pressure. Subsequently, the screw feeder 5 transfers the material to the vibrating screen 1 for screening. After the conveying is completed, the gas in the gas pipeline 11 can purge and clean the residual powder in the screw feeder 5 to prevent pipeline blockage.

[0024] Inside the vibrating screen 1, the double-layer jacket works in conjunction with the circulating water pipeline 7 to achieve temperature control. The internal double-layer screen accurately screens the material. After screening, the rotatable spherical nozzle 601 at the lower screen sprays air through the back-blowing air pipeline 6 to clean the residual fine powder in the screen holes to prevent clogging. The screened powder is temporarily stored in the temporary storage tank 10 and then conveyed to the pelletizer 3 by the screw feeder 5.

[0025] The pelletizer 3 adjusts the position of the disc 304 via the adjustable bracket 302. The binder preparation vessel 4 delivers the binder to the binder nozzle 301 via the delivery pump 8. The nozzle sprays the binder onto the disc 304, and the disc 304 rotates to form small balls. Under motor control, the scraper device 303 periodically cleans the binder material and agglomerated powder adhering to the inner wall of the disc 304. At the same time, during use, the distance between the scraper and the inner wall of the disc and the scraper angle can be adjusted appropriately to avoid hard contact that could damage the small balls during forming. The formed small balls can then enter the drying and calcination process for further processing. The operating principle of the scraper device is the same as that of the vertical scraper in the existing disc pelletizer.

Claims

1. An oxide microsphere sieving and forming system, characterized in that, The equipment includes a drying and crushing kettle (2), a vibrating screen (1), and a pelletizer (3). The drying and crushing kettle (2), the vibrating screen (1), and the pelletizer (3) are connected in sequence by a screw feeder (5). The pelletizer (3) includes a disc body (304) and an adjustable bracket (302) supporting the disc body (304). A binder nozzle (301) is provided on the bracket (302) at the disc body (304) and is connected to the binder preparation kettle (4) via a pipeline. A delivery pump (8) is provided on the pipeline.

2. The oxide microsphere screening and forming system according to claim 1, characterized in that, The vibrating screen (1) has a double-layer jacket structure, and the lower part of the jacket is connected to the circulating water pipeline (7).

3. The oxide microsphere screening and forming system according to claim 2, characterized in that, The lower part of the vibrating screen (1) is connected to the backflush air pipeline (6), and the outlet of the backflush air pipeline (6) is equipped with a rotatable spherical nozzle (601); a double-layer screen is installed inside the vibrating screen (1), and the rotatable spherical nozzle (601) is located at the lower part of the double-layer screen.

4. The oxide microsphere screening and forming system according to claim 1, characterized in that, A temporary storage tank (10) is installed on the pipeline connecting the lower part of the vibrating screen (1) to the screw feeder (5).

5. The oxide microsphere screening and forming system according to claim 1, characterized in that, The outlet of the adhesive spray nozzle (301) is directly opposite the disc body (304). A scraper device (303) is also installed on the bracket (302) at the disc body (304). The scraper device (303) is an adjustable intermittent type, and a wear-resistant rubber strip is added to the bottom of the scraper.

6. The oxide microsphere screening and forming system according to claim 1, characterized in that, A stirrer (202) is provided in the center of the drying and crushing vessel (2), and a baffle plate (201) is provided on the inner wall of the vessel. Dispersion holes are provided on the baffle plate (201).

7. The oxide microsphere screening and forming system according to claim 1, characterized in that, A buffer tank (9) is installed on the pipeline connecting the lower part of the drying crusher (2) to the screw feeder (5), and the upper part of the buffer tank (9) is connected to the gas pipeline (11).

8. The oxide microsphere screening and forming system according to claim 1, characterized in that, The upper part of the vibrating screen (1) is also connected to the exhaust gas pipeline (12), and a filter screen is installed at the connection.

9. The oxide microsphere screening and forming system according to claim 8, characterized in that, The exhaust pipe (12) is connected to the vacuum system (14), and a pressure buffer tank (13) is installed at the connection point. A pressure gauge is installed on the pressure buffer tank (13).

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