A granulation apparatus and process for producing coated zinc oxide

Abstract

This invention relates to the field of granulation equipment technology, specifically to a granulation equipment and process for producing coated zinc oxide. The equipment includes a conveying pipe with a viscous outer cylinder at its top. A sparse inner cylinder is fixedly connected inside the viscous outer cylinder. A second pump body is installed on one side of the bottom of the viscous outer cylinder, and a viscous infusion conduit is fixedly connected to the output end of the second pump body, with one end of the viscous infusion conduit extending into a discharge pipe. A pressure-reducing component for lowering local air pressure is installed at the bottom of the sparse inner cylinder. The pressure-reducing component includes several connecting rods installed on the sparse inner cylinder. A fixed plate is fixedly connected to the bottom of each connecting rod, and a discharge pipe penetrating the fixed ring and the conveying pipe is fixedly connected to the bottom of each fixed plate. A gourd-shaped guide fluid is embedded through the fixed plate, and a flow-storing ring groove is formed on the upper elliptical surface of the gourd-shaped guide fluid. The beneficial effects of this invention are: effectively buffering air pressure fluctuations during fluid flow, significantly reducing sudden increases in local pressure, and ensuring stable delivery of the coating liquid.

Description

Technical Field

[0001] This invention relates to the field of granulation equipment technology, specifically to a granulation equipment and process for producing coated zinc oxide. Background Technology

[0002] Coated zinc oxide is a functional material that uses specific coating materials (such as polymers and lipids) to coat zinc oxide particles. This reduces the direct contact between zinc oxide and the external environment, minimizing its loss and side effects during use, while also enabling targeted release. It is widely used in animal husbandry (as a feed additive for antibacterial and gut protection, improving bioavailability), the coatings industry (to enhance coating corrosion resistance), and the pharmaceutical field (for use in skin and mucous membrane care preparations).

[0003] During the granulation process, the zinc oxide raw material is first ground and sieved (to control uniform particle size), and then a viscous coating liquid is prepared in proportion. Subsequently, the zinc oxide powder is conveyed by a conveying device (such as a screw conveyor), and the coating liquid is precisely added through a special mechanism (such as a fluid guide or infusion conduit) to form a liquid film and mix with the zinc oxide particles. Finally, the particles are granulated by the granulation mechanism. Afterward, drying and secondary sieving are required to ensure particle quality.

[0004] During the granulation process of coated zinc oxide, when the coating liquid is added and transported into the device, a sudden increase in local pressure is likely to occur. The sudden increase in pressure will cause the flow of the coating liquid to be unstable, resulting in uneven coating and affecting the coating effect and granulation quality of zinc oxide. Therefore, it is necessary to propose a granulation device and process for coated zinc oxide. Summary of the Invention

[0005] To address the problems in the prior art, the present invention provides a granulation apparatus for producing coated zinc oxide.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a granulation device for producing coated zinc oxide, including a conveying pipe, a feed pipe embedded at the top of one end of the conveying pipe, a conveying pipe embedded at the other end of the conveying pipe, a drive motor fixedly installed at the other end of the conveying pipe, a spiral conveying rod fixedly connected to the output end of the drive motor, and a granulation mechanism provided at one end of the conveying pipe.

[0007] The top of the conveying pipe is provided with a viscous outer cylinder, and a sparse inner cylinder is fixedly connected inside the viscous outer cylinder. A first pump body is fixedly connected to the middle of the bottom end of the sparse inner cylinder. The first pump body has an electromagnetic pulse valve at its output end and a sparse infusion conduit at its output end. A second pump body is installed on one side of the bottom end of the viscous outer cylinder. A viscous infusion conduit is fixedly connected to the output end of the second pump body, and one end of the viscous infusion conduit extends into the feed pipe.

[0008] The bottom end of the sparse inner cylinder is provided with a pressure reducing component for reducing local air pressure. The pressure reducing component includes several connecting rods installed on the sparse inner cylinder. The bottom end of each connecting rod is fixedly connected to a fixing plate. The bottom end of each fixing plate is fixedly connected to a discharge pipe that passes through the fixing ring and the conveying pipe. A gourd-shaped guide is embedded through the fixing plate. A flow storage ring groove is opened on the upper surface of the lower ellipse of the gourd-shaped guide. A condensation hole is opened at the bottom end of the gourd-shaped guide.

[0009] Specifically, support frames are installed at both ends of the conveying pipeline.

[0010] Specifically, a fixing ring is fitted around the middle of the outer wall of the conveying pipe, and a support rod is fixedly connected to the top edge of the fixing ring. Two mounting rings are fixedly connected to the inner side wall of the support rod.

[0011] Specifically, the top of the sparse inner cylinder and the viscous outer cylinder are respectively fitted with a first feeding pipe and a second feeding pipe.

[0012] Specifically, the gourd-shaped fluid guide has a waist-shaped cross-section that is smaller at the top and larger at the bottom, and thinner in the middle, and the gourd-shaped fluid guide is made of polytetrafluoroethylene.

[0013] Specifically, the nozzle end of the sparse infusion conduit is close to the upper end of the condensation membrane pore, while the spray end of the viscous infusion conduit is located at the upper end of the reservoir ring groove.

[0014] Specifically, the feed tube corresponds to one of the gaps in the screw conveyor.

[0015] A granulation process for coated zinc oxide production includes pretreatment of zinc oxide raw materials and preparation of a viscous coating solution in the preceding steps.

[0016] Main process steps:

[0017] Liquid supply preparation: Low-viscosity dilute liquid is injected into the dilute inner cylinder through the first feeding pipe, and low-viscosity coating liquid is injected into the viscous outer cylinder through the second feeding pipe.

[0018] Formation of viscous liquid film: After being pressurized by the second pump body, the low-viscosity coating liquid is transported to the storage ring groove of the gourd-shaped guide fluid through the viscous infusion conduit. Due to continuous injection, the viscous coating liquid overflows from the storage ring groove and slides down the surface of the gourd-shaped guide fluid to the outer bottom end. Under the action of gravity, a continuous viscous liquid film is formed at the condensation pores.

[0019] Pulse penetration: After being pressurized by the first pump, the low-viscosity dilute liquid in the dilute inner cylinder is injected into the viscous liquid film at the condensation pores in an intermittent pulse form by the electromagnetic pulse valve controlling the dilute infusion conduit at a set frequency, achieving precise penetration; at the same time, the low-viscosity coating liquid continuously slides down along the guide to replenish it, so that the liquid film always remains in a continuous state, effectively buffering the impact of local air pressure fluctuations in the delivery pipeline during the pulse injection of dilute liquid;

[0020] Mixing and conveying: The drive motor is started to drive the spiral conveyor rod in the conveying pipeline to rotate at a constant speed, conveying the zinc oxide powder fed from the feed pipe forward; the coated droplets formed at the condensation film holes fall precisely into the gap of the spiral conveyor rod through the feed pipe. Under its stirring and conveying action, the coated droplets and zinc oxide powder are fully mixed, and the final mixture is conveyed to the granulation mechanism through the conveying pipe.

[0021] Granulation complete: The zinc oxide particles are prepared by the granulation mechanism.

[0022] Subsequent processes include drying, sieving, and quality inspection of the granules produced by the granulation unit.

[0023] The beneficial effects of this invention are as follows: The gourd-shaped guide fluid plays a core guiding role, and its storage ring groove can receive the viscous coating liquid, allowing the viscous coating liquid to slide down the surface of the guide fluid and form a continuous viscous coating film at the condensation pores; at the same time, the low-viscosity dilute liquid is controlled by the electromagnetic pulse valve at a set frequency to penetrate the viscous coating film in a pulse form, forming a composite droplet in which the viscous coating film encapsulates the dilute coating liquid, effectively buffering the pressure fluctuations during the descent of the buffer liquid, reducing the phenomenon of sudden local pressure increases, ensuring stable delivery of the coating liquid, and providing favorable conditions for subsequent uniform coating and efficient granulation. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of a zinc oxide coating granulation device provided by the present invention.

[0026] Figure 2 This is a schematic cross-sectional view of an apparatus for producing granulated zinc oxide coating, provided by the present invention.

[0027] Figure 3 This is a schematic cross-sectional view of the inner and outer cylinders of a zinc oxide coating granulation device provided by the present invention.

[0028] Figure 4 This invention provides a zinc oxide coating granulation apparatus. Figure 3 Enlarged structural diagram at point A in the middle;

[0029] Figure 5This invention provides a schematic cross-sectional view of a gourd-shaped fluid guide in a zinc oxide coating granulation device.

[0030] Figure 6 This is a schematic cross-sectional plan view of a gourd-shaped fluid guide for a zinc oxide coating granulation device provided by the present invention.

[0031] In the diagram: 1. Conveying pipe; 10. Support frame; 11. Feed pipe; 12. Conveying pipe; 13. Drive motor; 14. Screw conveyor; 2. Fixing ring; 21. Support rod; 22. Mounting ring; 23. Sparse inner cylinder; 230. First feeding pipe; 231. First pump body; 232. Electromagnetic pulse valve; 233. Sparse infusion conduit; 24. Viscous outer cylinder; 240. Second feeding pipe; 241. Second pump body; 242. Viscous infusion conduit; 3. Pressure reducing component; 31. Connecting rod; 32. Fixing disc; 33. Gourd-shaped guide tube; 34. Discharge pipe; 301. Flow storage ring groove; 302. Coagulation membrane pore; 4. Granulation mechanism. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0033] like Figures 1-6 As shown, the present invention provides the following technical solution:

[0034] Example 1: A granulation device for producing coated zinc oxide includes a conveying pipe 1, a feed pipe 11 is embedded at the top of one end of the conveying pipe 1, a conveying pipe 12 is embedded at the other end of the conveying pipe 1, a drive motor 13 is fixedly installed at the other end of the conveying pipe 1, a spiral conveying rod 14 is fixedly connected to the output end of the drive motor 13, a granulation mechanism 4 is provided at one end of the conveying pipe 12, and a support frame 10 is installed at both ends of the conveying pipe 1.

[0035] In use, the pretreated zinc oxide powder is fed into the conveying pipe 1 through the feed pipe 11. The drive motor 13 is started to drive the screw conveyor 14 to rotate. The powder moves forward under the push of the screw and is sent into the granulation mechanism 4 through the conveying pipe 12 to complete granulation. The support frame 10 ensures the stable operation of the conveying pipe 1. It is suitable for basic granulation scenarios.

[0036] Example 2: The technical solution of this example, which differs from that of Example 1, includes: a viscous outer cylinder 24 is provided at the top of the conveying pipe 1, a sparse inner cylinder 23 is fixedly connected inside the viscous outer cylinder 24, a first pump body 231 is fixedly connected to the middle of the bottom end of the sparse inner cylinder 23, an electromagnetic pulse valve 232 is provided at the output end of the first pump body 231, a sparse infusion conduit 233 is provided at the output end of the electromagnetic pulse valve 232, a second pump body 241 is installed on one side of the bottom end of the viscous outer cylinder 24, a viscous infusion conduit 242 is fixedly connected to the output end of the second pump body 241, and one end of the viscous infusion conduit 242 extends into the discharge pipe 34;

[0037] The bottom end of the sparse inner cylinder 23 is equipped with a pressure-reducing component 3 for reducing local air pressure. The pressure-reducing component 3 includes several connecting rods 31 installed on the sparse inner cylinder 23. The bottom end of each connecting rod 31 is fixedly connected to a fixing plate 32. The bottom end of each fixing plate 32 is fixedly connected to a discharge pipe 34 that passes through the fixing ring 2 and the conveying pipe 1. A gourd-shaped guide 33 is embedded through the fixing plate 32. A flow storage ring groove 301 is opened on the upper surface of the lower ellipse of the gourd-shaped guide 33. A condensation hole 302 is opened at the bottom end of the gourd-shaped guide 33. A fixing ring 2 is sleeved in the middle of the outer wall of the conveying pipe 1. A support rod 21 is fixedly connected to the top edge of the fixing ring 2. Two mounting rings 22 are fixedly connected to the inner side wall of the support rod 21. The sparse inner cylinder 23 and the viscous outer cylinder 1 are connected to the viscous outer cylinder 1. The top of the cylinder 24 is respectively equipped with a first feeding pipe 230 and a second feeding pipe 240. The gourd-shaped guide fluid 33 has a waist-shaped cross-section that is smaller at the top and larger at the bottom and thinner in the middle. The gourd-shaped guide fluid 33 is made of polytetrafluoroethylene (PTFE). The nozzle end of the sparse infusion conduit 233 is close to the upper end of the condensation membrane hole 302. The spray end of the viscous infusion conduit 242 is located at the upper end of the storage ring groove 301. The feed pipe 34 corresponds to one of the gaps of the screw conveyor 14. The electromagnetic pulse valve 232, the first pump body 231, and the second pump body 241 are all connected to their respective power circuits and are electrically linked through the same control system such as PLC. The gourd-shaped guide fluid 33 made of polytetrafluoroethylene (PTFE) is convenient for the flow of low-viscosity liquids.

[0038] In use, a low-viscosity dilute liquid is first injected into the dilute inner cylinder 23 through the first feeding pipe 230, and a viscous coating liquid is injected into the viscous outer cylinder 24 through the second feeding pipe 240. The control system is then activated, causing the first pump body 231, the second pump body 241, and the electromagnetic pulse valve 232 to work in conjunction. The second pump body 241 pressurizes the viscous coating liquid and then delivers it through the viscous infusion conduit 242 to the storage ring trough 301 of the gourd-shaped guide fluid 33. The continuously injected liquid flows along the polytetrafluoroethylene material... The waist-shaped guide fluid slides down the surface and forms a continuous liquid film in the condensation pores 302. At the same time, the dilute liquid pressurized by the first pump body 231 is controlled by the electromagnetic pulse valve 232 at a set frequency and is pulsed through the dilute infusion conduit 233 to penetrate the liquid film. The viscous film will coat the dilute liquid and form a coating liquid droplet into the zinc oxide powder and mix it thoroughly. This reduces the local pressure increase when the coating liquid directly enters the conveying pipe 1. Finally, it is sent to the granulation mechanism 4 through the conveying pipe 12 to complete the granulation.

[0039] A granulation process for producing coated zinc oxide includes pretreatment of zinc oxide raw materials (such as grinding and sieving to a preset particle size) and preparation of a viscous coating solution (mixing coating agent and solvent in proportion).

[0040] Main process steps:

[0041] Liquid supply preparation: Low viscosity dilute liquid is injected into the dilute inner cylinder 23 through the first feeding pipe 230, and at the same time, low viscosity coating liquid is injected into the viscous outer cylinder 24 through the second feeding pipe 240.

[0042] Formation of viscous liquid film: After being pressurized by the second pump body 241, the low-viscosity coating liquid is transported through the viscous infusion conduit 242 to the storage ring groove 301 of the gourd-shaped guide fluid 33. Due to continuous injection, the viscous coating liquid overflows from the storage ring groove 301 and slides down the surface of the gourd-shaped guide fluid 33 to the outer bottom end. Under the action of gravity, a continuous viscous liquid film is formed at the condensation pore 302.

[0043] Pulse penetration: After being pressurized by the first pump body 231, the low-viscosity dilute liquid in the dilute inner cylinder 23 is injected into the viscous liquid film at the condensation membrane pore 302 in an intermittent pulse form by the electromagnetic pulse valve 232 controlling the dilute infusion conduit 233 at a set frequency, achieving precise penetration; at the same time, the low-viscosity coating liquid continuously slides down along the guide fluid to replenish it, so that the liquid film always remains in a continuous state, effectively buffering the impact of local air pressure fluctuations in the delivery pipeline 1 during the pulse injection of dilute liquid;

[0044] Mixing and conveying: Start the drive motor 13 to drive the spiral conveyor rod 14 in the conveying pipe 1 to rotate at a constant speed, and convey the zinc oxide powder fed from the feed pipe 11 forward; the coated droplets formed at the condensation hole 302 fall precisely into the gap of the spiral conveyor rod 14 through the discharge pipe 34. Under its stirring and conveying action, the coated droplets and zinc oxide powder are fully mixed, and the final mixture is conveyed to the granulation mechanism 4 through the conveying pipe 12.

[0045] Granulation complete: The zinc oxide particles are prepared by the granulation unit 4.

[0046] Subsequent processes include drying (removing moisture or solvent) the granules produced by granulation unit 4, sieving (separating particles of unqualified size) and quality inspection (testing the integrity and purity of the coating).

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A granulation apparatus for producing coated zinc oxide, comprising a conveying pipe (1), wherein a feed pipe (11) is embedded at the top of one end of the conveying pipe (1), a conveying pipe (12) is embedded at the other end of the conveying pipe (1), a drive motor (13) is fixedly installed at the other end of the conveying pipe (1), a spiral conveying rod (14) is fixedly connected to the output end of the drive motor (13), and a granulation mechanism (4) is provided at one end of the conveying pipe (12); characterized in that, The top of the conveying pipe (1) is provided with a viscous outer cylinder (24), and a sparse inner cylinder (23) is fixedly connected inside the viscous outer cylinder (24). A first pump body (231) is fixedly connected to the middle of the bottom end of the sparse inner cylinder (23). An electromagnetic pulse valve (232) is provided at the output end of the first pump body (231). A sparse infusion conduit (233) is provided at the output end of the electromagnetic pulse valve (232). A second pump body (241) is installed on one side of the bottom end of the viscous outer cylinder (24). A viscous infusion conduit (242) is fixedly connected to the output end of the second pump body (241), and one end of the viscous infusion conduit (242) extends into the feed pipe (34). The bottom end of the sparse inner cylinder (23) is provided with a pressure reducing component (3) for reducing local air pressure. The pressure reducing component (3) includes several connecting rods (31) installed on the sparse inner cylinder (23). The bottom end of each connecting rod (31) is fixedly connected to a fixed plate (32). The bottom end of each fixed plate (32) is fixedly connected to a feed pipe (34) that passes through the fixed ring (2) and the conveying pipe (1). A gourd-shaped guide fluid (33) is embedded through the fixed plate (32). A flow storage ring groove (301) is opened on the upper surface of the lower ellipse of the gourd-shaped guide fluid (33). A condensation hole (302) is opened at the bottom end of the gourd-shaped guide fluid (33). The nozzle end of the sparse infusion conduit (233) is close to the upper end of the condensation membrane hole (302), and the spray end of the viscous infusion conduit (242) is located at the upper end of the reservoir ring groove (301). The feed tube (34) corresponds to one of the gaps of the screw conveyor (14).

2. The zinc oxide coating granulation apparatus according to claim 1, characterized in that: Both ends of the conveying pipe (1) are equipped with support frames (10).

3. The zinc oxide coating granulation apparatus according to claim 1, characterized in that: A fixing ring (2) is sleeved in the middle of the outer wall of the conveying pipe (1). A support rod (21) is fixedly connected to the top edge of the fixing ring (2). Two mounting rings (22) are fixedly connected to the inner side wall of the support rod (21).

4. The zinc oxide coating granulation apparatus according to claim 1, characterized in that: The top ends of the sparse inner cylinder (23) and the viscous outer cylinder (24) are respectively fitted with a first feeding pipe (230) and a second feeding pipe (240).

5. The zinc oxide coating granulation apparatus according to claim 1, characterized in that: The gourd-shaped fluid guide (33) has a waist-shaped cross-section that is smaller at the top and larger at the bottom, and thinner in the middle. The gourd-shaped fluid guide (33) is made of polytetrafluoroethylene (PTFE).

6. The granulation process of a zinc oxide coating granulation apparatus according to any one of claims 1-5, characterized in that: The preceding processes include the pretreatment of zinc oxide raw materials and the preparation of viscous coating solution; Main process steps: Liquid supply preparation: Low viscosity dilute liquid is injected into the dilute inner cylinder (23) through the first feeding pipe (230), and low viscosity coating liquid is injected into the viscous outer cylinder (24) through the second feeding pipe (240); Formation of viscous liquid film: After being pressurized by the second pump body (241), the low-viscosity coating liquid is transported through the viscous infusion conduit (242) to the storage ring groove (301) of the gourd-shaped guide fluid (33). Due to continuous injection, the viscous coating liquid overflows from the storage ring groove (301) and slides down the surface of the gourd-shaped guide fluid (33) to the outer bottom end. Under the action of gravity, a continuous viscous liquid film is formed at the condensation pore (302). Pulse penetration: After the low-viscosity dilute liquid in the dilute inner cylinder (23) is pressurized by the first pump body (231), the dilute infusion conduit (233) is controlled by the electromagnetic pulse valve (232) at a set frequency to be sprayed onto the viscous liquid film at the condensation membrane pore (302) in an intermittent pulse form, so as to achieve precise penetration; at the same time, the low-viscosity coating liquid continues to slide down along the guide fluid to replenish, so that the liquid film always remains in a continuous state, effectively buffering the impact of the local air pressure fluctuation in the delivery pipeline (1) when the dilute liquid is pulsed; Mixing and conveying: Start the drive motor (13) to drive the spiral conveyor (14) in the conveying pipe (1) to rotate at a constant speed, and convey the zinc oxide powder fed from the feed pipe (11) forward; the coating droplets formed at the condensation hole (302) fall precisely into the gap of the spiral conveyor (14) through the feed pipe (34). Under its stirring and conveying action, the coating droplets and zinc oxide powder are fully mixed, and finally the mixture is conveyed to the granulation mechanism (4) through the conveying pipe (12). Granulation completed: The zinc oxide granules are prepared by the granulation mechanism (4); Subsequent processes include drying, sieving, and quality inspection of the granules produced by the granulation unit (4).

Images