A coating device for preventing granular material from agglomerating

Abstract

The present application relates to the technical field of material pretreatment, and provides an anti-caking granular coating device, including a first mixer, a second mixer, a transfer silo, a coating agent injection unit and an anti-adhesion powder injection unit, wherein the first mixer includes a first mixing tank and a first stirring mechanism, and the first mixing tank is connected with a feed pipe; the second mixer includes a second mixing tank and a second stirring mechanism, and the first mixing tank is connected with a discharge pipe; the transfer silo is connected between the first mixing tank and the second mixing tank; the coating agent injection unit includes a liquid agent box and a spray assembly, and the spray assembly includes a feed pipe and a coating nozzle connected to the feed pipe, one end of the feed pipe is connected to the liquid agent box, and one end of the coating nozzle is located in the first mixing tank; the anti-adhesion powder injection unit includes a powder silo, a material transport mechanism and a powder sprayer, and the powder sprayer includes a spray interface, and the spray interface is connected to the transfer silo. The present application can improve the coating uniformity of the granular surface.

Description

Technical Field

[0001] The present application relates to the technical field of material pretreatment, and in particular to a coating device for preventing granular materials from being caked. Background Art

[0002] Particle coating equipment is a mechanical device used to evenly coat a layer of a specific substance on the surface of various granular materials. This type of equipment is widely used in industries such as pharmaceuticals, food processing, chemicals, agricultural fertilizers, and metal anti-adhesion powders to improve the properties of granular materials, such as improving fluidity, moisture resistance, changing the appearance color, or increasing drug efficacy.

[0003] Particle coating equipment usually consists of several main parts: feeding system, coating chamber, spraying system, exhaust and dust removal device and control system. The feeding system is responsible for feeding the particulate material to be processed into the equipment. The coating chamber is where the actual coating takes place, so that the particles can fully contact the coating material. The spraying system includes nozzles and other related components to evenly apply liquid or solid coating materials to the surface of the particles. Exhaust and dust removal devices are used to exhaust exhaust gas and collect possible dust to ensure a safe and clean working environment. The control system generally contains electronic components such as sensors and controllers to monitor and adjust various operating parameters such as temperature, humidity, air flow rate, etc. to achieve the best coating effect.

[0004] In the production process of PPC (polymethyl ethylene carbonate) pellets, pellet coating equipment is used to coat the extruded PPC pellets with anti-adhesion powder, such as talcum powder, to prevent the pellets from clumping and sticking during transportation and sticking and hardening in the silo. However, in the subsequent transportation process, the coated anti-adhesion powder will fall off, resulting in uneven anti-adhesion powder coating on the surface of the PPC pellets. Summary of the invention

[0005] In order to improve the coating uniformity on the surface of pellets, the present application provides an anti-caking pellet coating device.

[0006] The present application provides a coating device for preventing granular material from hardening, which adopts the following technical solution:

[0007] A coating device for preventing granular material from caking, comprising:

[0008] A first mixer comprises a first mixing tank and a first stirring mechanism, wherein the first mixing tank is connected to a feed pipe;

[0009] A second mixer comprises a second mixing tank and a second stirring mechanism, wherein the first mixing tank is connected to a discharge pipe;

[0010] A transfer silo, the transfer silo is connected between the first mixing tank and the second mixing tank;

[0011] A coating agent injection unit, comprising a liquid agent box and a spray assembly, wherein the spray assembly comprises a feed pipe and a coating nozzle connected to the feed pipe, one end of the feed pipe is connected to the liquid agent box, and one end of the coating nozzle is located in the first mixing tank;

[0012] The anti-adhesion powder injection unit comprises a powder bin, a material transport mechanism and a powder sprayer. The material transport mechanism is used to transport the anti-adhesion powder in the powder bin to the powder sprayer. The powder sprayer comprises a material spraying interface, which is connected to the transfer bin.

[0013] By adopting the above technical solution, when in use, the liquid coating agent is contained in the liquid agent box, and the PPC pellets are poured into the first mixing tank from the feed pipe; the coating agent is sprayed on the surface of the pellets in the form of atomized small molecules through the spraying assembly, the first stirring mechanism mixes the coating agent and the pellets evenly, and the pellets coated with the coating agent enter the second mixing tank along the transfer bin; the anti-adhesion powder injection unit sprays the anti-adhesion powder into the transfer bin, and the anti-adhesion powder in the transfer bin enters the second mixing tank, and the second stirring mechanism mixes the pellets and the anti-adhesion powder evenly. A layer of coating agent is pre-sprayed on the surface of the pellets by the coating agent injection unit, which enhances the adhesion between the subsequent anti-adhesion powder and the pellets, reduces the possibility of the anti-adhesion powder falling off, and improves the coating effect.

[0014] Optionally, a mixing box is rotatably arranged in the transfer bin, a powder feed barrel is connected to the side wall of the mixing box close to the spray interface, and the powder feed barrel covers the connection between the spray interface and the transfer bin;

[0015] The mixing box is provided with a feed port and a discharge port, and both the feed port and the discharge port can be opened and closed; a driving source is provided outside the transfer bin, and the driving source is used to drive the mixing box to rotate.

[0016] By adopting the above technical solution, the anti-adhesion powder and granules can be pre-mixed in the mixing box before entering the second mixing tank, thereby ensuring that the anti-adhesion powder and granules are mixed more evenly. The feed port and the discharge port on the mixing box can be opened and closed, which effectively controls the inlet and outlet of the material, further improving the controllability and uniformity of the coating process; the driving source drives the mixing box to rotate, so that the anti-adhesion powder and granules are fully in contact in a dynamic state, improving the quality stability of the final product.

[0017] Optionally, an elastic feed cylinder is connected to the feed port, one end of the elastic feed cylinder is located in the mixing box, and the elastic feed cylinder gradually shrinks to a closed state in a direction close to the rotation axis of the mixing box;

[0018] When the granular materials are discharged into the elastic feeding tube, one end of the elastic feeding tube located in the mixing box is opened.

[0019] By adopting the above technical solution, the design of the elastic feed barrel allows the pellets to be smoothly introduced into the mixing box, avoiding the problem of pellet blockage. At the same time, the tapered design of the elastic feed barrel can remain closed when there is no pellet input, preventing external air and impurities from entering the mixing box, thereby ensuring the purity and uniformity of the coating process.

[0020] Optionally, an opening and closing member is provided on the mixing box, and the opening and closing member includes an opening and closing plate and a force source. The opening and closing plate is slidably provided at the discharge port, and the force source is used to drive the opening and closing plate to slide to open or close the discharge port.

[0021] By adopting the above technical solution, the force source drives the opening and closing plate to slide, thereby realizing precise control of the discharge port, which can prevent the premature leakage of the incompletely mixed anti-adhesion powder, ensure the full mixing of the anti-adhesion powder and the granular material, and improve the coating uniformity and anti-caking effect.

[0022] Optionally, a material guide hopper is provided at one end of the transfer silo close to the first mixing tank, the material guide hopper gradually shrinks in the direction away from the first mixing tank, and a material guide pipe is provided at one end of the material guide hopper, and the outer diameter of the material guide pipe is smaller than the inner diameter of the feed port.

[0023] By adopting the above technical solution, the design of the guide hopper allows the pellets to enter the transfer silo more smoothly, and the size of the guide pipe is smaller than the feed port, which further ensures the concentration and fluidity of the pellets before entering the mixing box, so that most of the pellets enter the mixing box first after entering the transfer silo and are mixed with the anti-adhesion powder first.

[0024] Optionally, a drying mechanism is further provided in the transfer silo, and the drying mechanism includes a hot air blowing component, a collecting tray, and a drying pipe connected to the collecting tray;

[0025] The collecting tray is arranged below the mixing box, and the hot air blowing assembly comprises a hot air nozzle, and a plurality of the hot air nozzles are connected to the drying pipe.

[0026] By adopting the above technical solution, the pellets can be dried after being discharged from the mixing box. The hot air provided by the hot air blowing component can effectively remove moisture from the surface of the pellets, further improving the adhesion strength of the anti-adhesion powder on the surface of the pellets. The setting of the collecting tray helps to collect the dried pellets in a centralized manner, making it easier for the pellets to enter the drying tube; multiple hot air nozzles are distributed on the drying tube, making the hot air distribution more uniform, further improving the drying efficiency and effect.

[0027] Optionally, a plurality of guide plates are fixed at intervals in the drying tube, and adjacent guide plates are staggered.

[0028] By adopting the above technical solution, multiple guide plates are arranged at intervals in the drying tube, and the pellets move along each guide plate in turn in the drying tube, which increases the contact time between the hot air and the pellets, thereby improving the drying efficiency and uniformity. It helps to reduce the adhesion caused by excessive humidity on the surface of the pellets, and further improves the anti-caking effect.

[0029] Optionally, the first stirring mechanism includes a first spiral stirrer, and the first spiral stirrer is also used to transport the material in the first mixing tank toward the transfer silo;

[0030] The second stirring mechanism includes a second spiral stirrer, and the second spiral stirrer is also used to transport the material in the second mixing tank toward the direction close to the discharge pipe.

[0031] By adopting the above technical solution, the first spiral mixer can effectively transport the mixed material in the first mixing tank toward the transfer silo while mixing the granular material and the coating agent, ensuring the continuity and fluidity of the material. At the same time, the second spiral mixer transports the mixed material in the second mixing tank toward the discharge pipe while mixing the granular material and the anti-adhesion powder, further ensuring the smooth flow of the material in the equipment, reducing the risk of blockage, and improving the operational reliability and production capacity of the entire system.

[0032] Optionally, a dust collector is also included, and the dust collector is connected to the second mixing tank.

[0033] By adopting the above technical solution, the dust collector is connected to the second mixing tank, which can effectively remove the dust that may be generated in the second mixing tank, prevent the dust from polluting the environment and affecting the health of the operator. At the same time, it keeps the interior of the second mixing tank clean, reduces the failure rate caused by dust accumulation, and improves the operating stability and service life of the second mixer.

[0034] Optionally, the material transport mechanism includes a screw loss-in-weight feeder.

[0035] By adopting the above technical solution, the screw loss-in-weight feeder can accurately control the delivery amount of the anti-sticking powder, ensuring that the anti-sticking powder enters the powder sprayer evenly and stably.

[0036] In summary, the present application includes at least one of the following beneficial effects:

[0037] 1. By spraying the coating agent on the surface of the pellets in advance in the first mixing tank, and then coating the pellets with anti-adhesion powder in the transfer silo and the second mixer, the anti-adhesion powder can be more firmly attached to the surface of the pellets, significantly improving the uniformity and stability of the coating;

[0038] 2. The design of the transfer silo and the mixing box structure inside it ensure that the anti-adhesion powder is fully mixed with the pre-treated granules, further improving the coating uniformity and reducing the agglomeration and compaction caused by the falling of the anti-adhesion powder;

[0039] 3. The first stirring mechanism and the second stirring mechanism respectively adopt spiral stirrers, which can effectively transport the materials from the feed end to the discharge end, ensuring the continuity and efficiency of the entire coating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the overall structure of the anti-caking granular material coating device of Example 1 of the present application;

[0041] Figure 2 is a partial enlarged structural schematic diagram of Example 1 of the present application;

[0042] Figure 3 This is a schematic diagram of the overall structure of the anti-caking granular material coating device of Example 2 of the present application;

[0043] Figure 4 It is a schematic cross-sectional structural diagram of the transfer silo in Example 2 of the present application;

[0044] Explanation of reference numerals: 1. first mixer; 11. first mixing tank; 12. first spiral stirrer; 13. feed pipe; 2. second mixer; 21. second mixing tank; 22. second spiral stirrer; 23. discharge pipe; 3. coating agent injection unit; 31. liquid agent box; 32. spraying assembly; 321. feeding pipe; 3211. feeding branch pipe; 322. coating nozzle; 4. powder injection unit; 41. powder bin; 42. screw loss-in-weight feeder; 43. powder sprayer; 431. spray Interface; 5. Transfer silo; 51. Guide hopper; 511. Guide pipe; 6. Mixing box; 61. Feed inlet; 62. Discharge outlet; 63. Powder feed barrel; 64. Elastic feed barrel; 65. Opening and closing parts; 651. Force source; 652. Opening and closing plate; 7. Driving source; 8. Moving frame; 9. Drying mechanism; 91. Hot air blowing assembly; 911. Air pipe; 912. Hot air nozzle; 913. Fan; 92. Collecting tray; 93. Drying pipe; 931. Guide plate; 10. Dust collector. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-Figure 4 This application is described in further detail.

[0046] Example 1

[0047] refer to Figure 1The anti-caking granular coating equipment provided in the embodiment of the present application includes a mobile frame 8, a first mixer 1, a second mixer 2, a transfer silo 5, a coating agent injection unit 3 and an anti-adhesion powder injection unit 4 arranged on the mobile frame 8.

[0048] refer to Figure 1 and Figure 2 The first mixer 1 and the second mixer 2 are fixed on the mobile frame 8 at intervals in the vertical direction. The transfer silo 5 is connected between the first mixer 1 and the second mixer 2 through a flange. The transfer silo 5 is specifically configured as a cylinder with openings at both ends. The first mixer 1 includes a first mixing tank 11 and a first stirring mechanism. The first mixing tank 11 is specifically configured as a cylindrical tank body. One end of the first mixing tank 11 is connected to a feed pipe 13; the first stirring mechanism is specifically configured as a first spiral stirrer 12. The first spiral stirrer 12 can transport the material in the first mixing tank 11 toward the transfer silo 5. The coating agent injection unit 3 is located above the first mixing tank 11. The coating agent injection unit 3 includes a liquid box 31 and a spray assembly 32. The liquid box 31 is fixed on the mobile frame 8. The liquid box 31 is mainly used to store liquid coating agents, and its volume can be selected according to actual needs. The spray assembly 32 includes a feed pipe 321, a pressure source and a coating nozzle 322 connected to the feed pipe 321, the coating nozzle 322 is fixed to the first mixing tank 11, and one end of the coating nozzle 322 is located in the first mixing tank 11. In this embodiment, the feed pipe 321 is connected to a plurality of feed branches 3211, and each feed branch 3211 is connected to the coating nozzle 322. The pressure source (not shown in the figure) is fixed to the liquid box 31, and a hydraulic pump, an electric pump, etc. can be selected to provide power for the spraying of the spray assembly 32.

[0049] refer to Figure 1 The second mixer 2 includes a second mixing tank 21 and a second stirring mechanism. The second mixing tank 21 is specifically configured as a cylindrical tank body. The end of the second mixing tank 21 away from the transfer silo 5 is connected to a discharge pipe 23; the second stirring mechanism is specifically configured as a second spiral stirrer 22, and the second spiral stirrer 22 can transport the material in the second mixing tank 21 toward the discharge pipe 23. The anti-adhesion powder injection unit 4 is located on one side of the transfer silo 5. The anti-adhesion powder injection unit 4 includes a powder bin 41 fixed on the mobile frame 8, a material transport mechanism and a powder sprayer 43. The powder bin 41 of the anti-adhesion powder injection unit 4 is used to store dry powdered anti-adhesion powder, and its material can be stainless steel or plastic. The material transport mechanism adopts a screw weightless feeder 42, and the screw weightless feeder 42 can accurately control the supply amount of the anti-adhesion powder by adjusting the speed of the screw. The screw loss-in-weight feeder 42 is connected to the powder sprayer 43 . The material transport mechanism is started to transport the anti-adhesion powder in the powder bin 41 to the powder sprayer 43 . The powder sprayer 43 includes a material spraying interface 431 , which is connected to the transfer bin 5 .

[0050] The first mixing tank 11, the second mixing tank 21 and the transfer silo 5 can be made of stainless steel or magnesium-aluminum alloy, and the movable frame 8 can be made of carbon steel.

[0051] In other embodiments, the material conveying mechanism of the anti-adhesion powder injection unit 4 is changed to a vibration feeder, and the anti-adhesion powder is evenly conveyed to the powder sprayer 43 by vibration.

[0052] refer to Figure 1 A dust collector 10 is also fixed above the second mixing tank 21. The dust collector 10 is connected to the first mixing tank 11 and is used to collect and filter the dust generated during the coating process to ensure a clean and safe working environment. The dust collector 10 mainly includes a bag filter 10 and a pulse cleaning system. The pulse cleaning system includes a solenoid valve and a compressed air pipeline, which cleans the dust on the filter bag by regularly releasing high-pressure gas.

[0053] The implementation principle of the anti-caking granular coating equipment in Example 1 of the present application is as follows: the PPC granules to be treated are pre-treated by the first mixer 1, and then a layer of liquid coating agent is sprayed on the surface of the PPC granules through the coating agent injection unit 3 to form a coating film to improve the coating effect of the subsequent anti-adhesion powder. Then, the PPC granules are transported to the transfer silo 5 by the first spiral mixer 12, and the anti-adhesion powder injection unit 4 sprays the anti-adhesion powder to the transfer silo 5 at this time, so that the anti-adhesion powder is wrapped on the surface of the PPC granules. Finally, the PPC granules and the anti-adhesion powder are stirred for the second time through the second mixer 2, and the anti-adhesion powder coating on the surface of the PPC granules is further increased, thereby effectively solving the agglomeration and caking problems caused by the falling off of the anti-adhesion powder during the transportation of the PPC granules. The whole process not only improves the uniformity of the coating, but also reduces the production cost and maintenance cost.

[0054] Example 2

[0055] refer to Figure 3 and Figure 4 The difference between this embodiment and the above embodiment is that: a mixing box 6 is added in the transfer bin 5, and the mixing box 6 is rotatably connected to the side wall of the transfer bin 5 through a rotating shaft; a driving source 7 is fixed outside the transfer bin 5, and in this embodiment, the driving source 7 is specifically configured as a servo motor, and the output shaft of the driving source 7 is coaxially fixed with the rotating shaft on the transfer bin 5. When the driving source 7 is started, the mixing box 6 can be driven to rotate in the transfer bin 5.

[0056] refer to Figure 4, a powder feed barrel 63 is connected to the side wall of the mixing box 6 near the spray interface 431. The powder feed barrel 63 is specifically configured as a cylindrical powder feed barrel 63 covering the connection between the spray interface 431 and the transfer bin 5, ensuring that the anti-adhesion powder sprayed from the spray interface 431 to the transfer bin 5 can be accurately introduced into the mixing box 6. A feed port 61 and a discharge port 62 are provided on the side wall of the mixing box 6. Both the feed port 61 and the discharge port 62 can be opened and closed to control the entry and exit of materials. In this embodiment, the material of the transfer bin 5 can be selected from transparent plastic, while observing the feeding and discharging conditions. Specifically, an elastic feed barrel 64 is fixedly connected to the feed port 61, and one end of the elastic feed barrel 64 extends into the mixing box 6; the elastic feed barrel 64 gradually shrinks in the direction close to the rotation axis of the mixing box 6 and is in a closed state. The elastic feed barrel 64 is made of soft material, such as silicone or rubber. The elastic feed tube 64 is initially closed. When the PPC pellets are discharged into the elastic feed tube 64, one end of the elastic feed tube 64 located in the mixing box 6 expands and deforms and opens, so that the PPC pellets can smoothly enter the mixing box 6. When the PPC pellets rotate in the mixing box 6, it is difficult to discharge the mixing box 6 from the feed port 61.

[0057] refer to Figure 4 The discharge port 62 is provided with an opening and closing member 65, which includes an opening and closing plate 652 and a force source 651. The force source 651 is specifically provided as an electric push rod. When the force source 651 is started, the opening and closing plate 652 can be driven to slide to open or close the discharge port 62. When the anti-adhesion powder and the PPC granules are mixed in the mixing box 6, the discharge port 62 can be opened by the opening and closing member 65 to discharge the PPC granules.

[0058] By adding the mixing box 6, the mixing uniformity of the anti-adhesion powder and the PPC granules is further enhanced. The rotational movement of the mixing box 6 allows the anti-adhesion powder and the PPC granules to fully contact in the mixing box 6, avoiding the situation of being too thick or too thin locally. The design of the elastic feed cylinder 64 allows the PPC granules to smoothly enter the mixing box 6, reducing the risk of impact and breakage. The opening and closing member 65 of the discharge port 62 can effectively control the outflow speed of the material. Ensure that each batch of processed PPC granules can achieve an ideal coating effect.

[0059] refer to Figure 4In order to facilitate the smooth flow of the PPC pellets from the first mixing tank 11 to the transfer bin 5 into the mixing box 6, a guide hopper 51 is fixed in the transfer bin 5. The guide hopper 51 is fixed at one end close to the first mixing tank 11; the guide hopper 51 gradually shrinks in the direction away from the first mixing tank 11, and a guide pipe 511 is integrally formed at one end of the guide hopper 51, and the size of the guide pipe 511 is smaller than the feed port 61. When the driving source 7 drives the mixing box 6 to rotate, so that the feed port 61 on the mixing box 6 is opposite to the outlet of the guide pipe 511, the first spiral mixer 12 can be started to transport the PPC pellets into the transfer bin 5.

[0060] refer to Figure 4 A drying mechanism 9 is also added in the transfer bin 5. The drying mechanism 9 includes a hot air purge assembly 91, a collecting tray 92 and a drying pipe 93. The hot air purge assembly 91 includes a fan 913, an air pipe 911 connected to the fan 913, and a hot air nozzle 912 connected to the air pipe 911. A plurality of hot air nozzles 912 are fixed at intervals on the drying pipe 93. The collecting tray 92 is arranged below the mixing box 6 and is fixedly connected to the inner wall of the transfer bin 5. The collecting tray 92 is in the shape of a disc, and its diameter is slightly smaller than the inner diameter of the transfer bin 5. A feeding hole is provided at the bottom of the collecting tray 92, so that the PPC pellets can be slowly added into the drying pipe 93. A plurality of guide plates 931 are arranged at intervals in the drying pipe 93. One end of the guide plate 931 is fixed to the inner wall of the drying pipe 93, and the other end is tilted downward. Adjacent guide plates 931 are staggered, and the tilt directions of two adjacent guide plates 931 are opposite. The plurality of guide plates 931 form a serpentine channel in the drying tube 93, which helps to increase the contact time between the hot air and the PPC pellets and improve the drying efficiency. The drying mechanism 9 can remove excess moisture on the surface of the PPC pellets and improve the quality of subsequent coating.

[0061] The implementation principle of the anti-caking granular coating equipment in Example 2 of the present application is as follows: through the guide hopper 51, the material can enter the mixing box 6 in the transfer bin 5 more smoothly, and the anti-adhesion powder and PPC granules can be pre-mixed in the mixing box 6 before entering the second mixing tank 21, so as to ensure that the anti-adhesion powder and PPC granules are mixed more evenly. The newly added drying mechanism 9 pre-dries the PPC granules discharged from the transfer bin 5, removes excess moisture on the surface, and solidifies the coating agent and anti-adhesion powder on the surface of the PPC granules.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A coating device for preventing granular material from agglomerating, characterized in that: include: A first mixer (1) comprises a first mixing tank (11) and a first stirring mechanism, wherein the first mixing tank (11) is connected to a feed pipe (13); a second mixer (2) comprises a second mixing tank (21) and a second stirring mechanism, wherein the first mixing tank (11) is connected to a discharge pipe (23); a transfer silo (5), wherein the transfer silo (5) is connected between the first mixing tank (11) and the second mixing tank (21); a coating agent injection unit (3) comprises a liquid agent box (31) and a spraying assembly (32), wherein the spraying assembly (32) comprises a feed pipe (32); 1) and a coating nozzle (322) connected to a feeding pipe (321), one end of the feeding pipe (321) being connected to the liquid agent box (31), and one end of the coating nozzle (322) being located in the first mixing tank (11); an anti-adhesion powder injection unit (4), comprising a powder bin (41), a material transport mechanism and a powder sprayer (43), the material transport mechanism being used to transport the anti-adhesion powder in the powder bin (41) to the powder sprayer (43), the powder sprayer (43) comprising a material spraying interface (431), and the material spraying interface (431) being connected to the transfer bin (5); A mixing box (6) is rotatably arranged in the transfer bin (5); a powder feed barrel (63) is connected to the side wall of the mixing box (6) near the spray interface (431); the powder feed barrel (63) covers the connection between the spray interface (431) and the transfer bin (5); a feed port (61) and a discharge port (62) are arranged on the mixing box (6), and both the feed port (61) and the discharge port (62) can be opened and closed; a driving source (7) is arranged outside the transfer bin (5), and the driving source (7) is used to drive the mixing box (6) to rotate.

2. The anti-caking granular material coating equipment according to claim 1 is characterized in that: The feed port (61) is connected to an elastic feed barrel (64), one end of the elastic feed barrel (64) is located in the mixing box (6), and the elastic feed barrel (64) gradually shrinks to a closed state in a direction close to the rotation axis of the mixing box (6); when the granular material is discharged into the elastic feed barrel (64), the end of the elastic feed barrel (64) located in the mixing box (6) is opened.

3. The anti-caking granular material coating equipment according to claim 1 is characterized in that: The mixing box (6) is provided with an opening and closing member (65), the opening and closing member (65) comprising an opening and closing plate (652) and a force source (651), the opening and closing plate (652) being slidably disposed at the material outlet (62), and the force source (651) being used to drive the opening and closing plate (652) to slide so as to open or close the material outlet (62).

4. The anti-caking granular material coating device according to claim 2 is characterized in that: A material guide hopper (51) is provided at one end of the transfer silo (5) close to the first mixing tank (11), the material guide hopper (51) gradually shrinks in a direction away from the first mixing tank (11), and a material guide pipe (511) is provided at one end of the material guide hopper (51), the outer diameter of the material guide pipe (511) being smaller than the inner diameter of the feed port (61).

5. The anti-caking granular material coating device according to claim 4 is characterized in that: A drying mechanism (9) is also provided in the transfer bin (5), the drying mechanism (9) comprising a hot air blowing assembly (91), a material collecting tray (92), and a drying pipe (93) connected to the material collecting tray (92); the material collecting tray (92) is provided below the mixing box (6), the hot air blowing assembly (91) comprises a hot air nozzle (912), and a plurality of hot air nozzles (912) are connected to the drying pipe (93).

6. The anti-caking granular material coating device according to claim 5, characterized in that: A plurality of guide plates (931) are fixed at intervals in the drying tube (93), and adjacent guide plates (931) are staggered.

7. The anti-caking granular material coating equipment according to claim 1 is characterized in that: The first stirring mechanism comprises a first spiral stirrer (12), and the first spiral stirrer (12) is also used to transport the material in the first mixing tank (11) towards the direction close to the transfer silo (5); the second stirring mechanism comprises a second spiral stirrer (22), and the second spiral stirrer (22) is also used to transport the material in the second mixing tank (21) towards the direction close to the discharge pipe (23).

8. The anti-caking granular material coating device according to claim 1, characterized in that: It also includes a dust collector (10), wherein the dust collector (10) is connected to the second mixing tank (21).

9. The anti-caking granular material coating device according to claim 1, characterized in that: The material transport mechanism comprises a screw loss-in-weight feeder (42).

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