Sectional type drum film coating device based on dynamic variable and film coating method of sectional type drum film coating device

Abstract

The invention discloses a sectional type rotary drum coating device based on dynamic variables and a coating method thereof, and relates to the technical field of fertilizer processing, a rotary drum is obliquely arranged on a support, a spraying mechanism comprises a spraying pipe, the spraying pipe is arranged in the rotary drum, the rotary drum comprises a preheating section, a coating section and a cooling section which are sequentially connected from high to low, and the coating section is arranged in the cooling section. A first material turning plate is arranged in the preheating section, the coating section comprises a spraying section and a curing section which are arranged at an interval along the axis, the spraying section and the curing section are rotationally connected, more than two partition baffles are arranged at a gap at the joint of the spraying section and the curing section, and a notch for a fertilizer to pass through is reserved between every two adjacent partition baffles; the spraying section and the curing section are each connected with a driving unit, the driving units are fixedly arranged on the support, and the spraying section and the curing section are each provided with a material overturning mechanism. The sectional type multi-time coating processing mode is adopted, the fertilizer coating uniformity and coating quality are improved, and adhesion between fertilizers and waste of coating materials can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of fertilizer processing, and more specifically, to a dynamic variable segmented drum coating device and a coating method thereof. Background Art

[0002] Coated controlled-release fertilizers are made by spraying various polymer materials on the surface of fertilizer particles using physical or chemical methods. The film material is dried or cured by reaction to form a dense coating, thereby achieving the controlled release of fertilizer nutrients. Drum coating is a way of fertilizer coating. After screening, the fertilizer is put into the drum. The drum rotates to drive the fertilizer to roll inside it, and then the coating material is sprayed on the fertilizer to form a coating layer on its outer surface.

[0003] The existing coating process is generally a single coating. However, in actual production, if the coating thickness is relatively thick, it is not easy to form a uniform coating layer on the surface of the fertilizer by single spraying. Spraying too much coating material at one time is also likely to cause adhesion between fertilizers and waste of coating material. Summary of the Invention

[0004] In order to overcome the defects of the prior art, the present invention provides a dynamic variable segmented drum coating device, which adopts a segmented multi-coating processing method, not only improves the uniformity and quality of fertilizer coating, but also can avoid adhesion between fertilizers and waste of coating material, and has good market application prospects.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a dynamic variable segmented drum coating device, including a bracket, a drum, a spraying mechanism, a driving unit and a material turning mechanism. The drum is inclined on the bracket. The spraying mechanism includes a spraying pipe which is arranged inside the drum. The drum includes a preheating section, a coating section and a cooling section which are connected in sequence from high to low. A first material turning plate is arranged in the preheating section. The coating section includes a spraying section and a curing section which are arranged at intervals along the axis, and the spraying section and the curing section are rotatably connected. More than two partition baffles are arranged at the gap at the connection of the spraying section and the curing section, and a gap for fertilizers to pass through is reserved between adjacent partition baffles. Driving units are connected to both the spraying section and the curing section, and the driving units are fixed on the bracket. Material turning mechanisms are arranged on both the spraying section and the curing section.

[0007] In a preferred technical solution of the present invention, the spraying mechanism further includes a spraying machine main body, a batching tank, a vertical frame and nozzles. The spraying machine main body is arranged on one side of the bracket. The input end of the spraying machine main body is connected to the batching tank, the output end of the spraying machine main body is connected to the spraying pipe, vertical frames are connected to both ends of the spraying pipe, and more than two nozzles are arranged on the spraying pipe, and the nozzles are located inside the spraying section.

[0008] In a preferred technical solution of the present invention, a hot air blower is provided on the stand located on one side of the preheating section.

[0009] In a preferred technical solution of the present invention, more than two sub-sieve plates are evenly embedded on the outer side wall of the cooling section, and air coolers are provided on both sides of the cooling section.

[0010] In a preferred technical solution of the present invention, the driving unit includes a reduction motor, gears and gear rings. The reduction motor is fixed on the bracket, and a gear is connected to the power shaft of the reduction motor. Gear rings are provided on the outer walls of the spray section and the curing section. The gear rings and the gears are meshed with each other, and the number of gear rings and gears is equal and one-to-one corresponding.

[0011] In a preferred technical solution of the present invention, the material flipping mechanism includes a second material flipping plate, a limiting rod, a slider, a spring and a guide arc plate. The spray section and the curing section are each provided with more than two clearance holes. Limiting rods are provided at both ends of the clearance holes. The limiting rod is slidably connected with a slider. The spring is sleeved on the limiting rod, one end of the spring is connected to the limiting rod, and the other end of the spring is connected to the slider. A second material flipping plate is also slidably connected in the clearance hole, and one end of the slider is connected to the second material flipping plate. The guide arc plate is fixed on the bracket, and the inner arc surface of the guide arc plate abuts and cooperates with the second material flipping plate.

[0012] In a preferred technical solution of the present invention, the curvature of the guide arc plate is 0 to π / 4 rad.

[0013] The present invention also provides a coating method based on a dynamic variable segmented drum coating device, comprising the following steps:

[0014] S1. Add fertilizer into the drum from one side of the preheating section, and start the reduction motor to drive the drum to rotate, so that the fertilizer can slide down along the inner wall of the drum while rolling;

[0015] S2, start the hot air blower to preheat the fertilizer in the preheating section to soften its surface for easy coating;

[0016] S3. After the fertilizer is preheated, it will enter the spraying section, and the spraying machine host will be started. The spraying machine host will extract the wrapping material from the batching tank according to the preset ratio and prepare it to obtain the coating material, and then transport the coating material to the nozzle through the spray pipe to spray it out, so as to coat the fertilizer;

[0017] S4. After the fertilizer is coated, it will enter the curing section for pre-curing;

[0018] S5, the pre-cured fertilizer will enter the next spraying section, and steps S3 to S4 will be repeated to achieve multiple coating of the fertilizer;

[0019] S6. After multiple coatings, the fertilizer will enter the cooling section. The air cooler will be started. The air cooler will blow cold air into the interior through the through holes of the sieve plate, thereby cooling the fertilizer and completely solidifying it. At the same time, the rotation of the cooling section will also screen out unqualified broken materials through the through holes on the sieve plate to ensure the uniformity of the fertilizer.

[0020] In a preferred technical solution of the present invention, in step S1, the second flipping plate will be driven to rotate synchronously during the rotation of the drum. When the second flipping plate contacts the guide arc plate and slides along the inner wall of the guide arc plate, the second flipping plate will protrude into the interior of the drum, thereby driving the fertilizer to move. After the second flipping plate slides over the guide arc plate, the spring force will cause the second flipping plate to retract into the clearance hole, thereby causing the fertilizer to slide off.

[0021] In a preferred technical solution of the present invention, in step S1, the rotation speed of the curing section should be greater than the rotation speed of the spraying section.

[0022] The beneficial effects of the present invention are:

[0023] 1. The dynamic variable segmented drum coating device proposed in the present invention adopts a segmented multiple coating processing method, which not only improves the fertilizer coating uniformity and coating quality, but also can avoid adhesion between fertilizers and waste of coating materials, and has good market application prospects.

[0024] 2. In the present invention, the adjacent spraying section and curing section form a coating processing unit, and a plurality of coating processing units form a coating section. By adjusting the number of coating processing units, the number of times the fertilizer is coated can be conveniently controlled, thereby being applicable to the processing of different types of fertilizers.

[0025] 3. In the coating process of the present invention, the lower rotation speed of the spraying section helps to ensure the full penetration and adhesion of the coating material, while the higher speed of the curing section helps to solidify the attached coating, thereby achieving pre-curing and improving the effect of fertilizer coating. The coating material is not easy to fall off, ensuring the integrity of the fertilizer coating and improving the coating quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a dynamic variable segmented drum coating device provided by a specific embodiment of the present invention;

[0027] Figure 2 yes Figure 1 A half-section view of

[0028] Figure 3 It is a schematic diagram of the structure of the drum from the right side;

[0029] Figure 4 It is a structural diagram of the main viewing direction of the drum;

[0030] Figure 5 It is a schematic diagram of the installation structure of the guide arc plate and the bracket;

[0031] Figure 6 It is a structural diagram of the material turning mechanism (after removing the guide arc plate).

[0032] In the figure:

[0033] 1. Bracket; 2. Drum; 21. Preheating section; 211. First turning plate; 212. Hot air blower; 22. Coating section; 221. Spraying section; 222. Curing section; 223. Partition baffle; 224. Notch; 23. Cooling section; 231. Screening plate; 232. Cold air blower; 3. Spraying mechanism; 31. Spraying pipe; 32. Spraying machine host; 33. Mixing tank; 34. Stand; 35. Spray head; 4. Driving unit; 41. Speed ​​reduction motor; 42. Gear; 43. Gear ring; 5. Turning mechanism; 51. Second turning plate; 52. Limit rod; 53. Sliding block; 54. Spring; 55. Guide arc plate; 56. Clearance hole. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0035] like Figures 1-6As shown in the figure, in the embodiment, a dynamic variable segmented drum coating device is provided, which includes a bracket 1, a drum 2, a spraying mechanism 3, a driving unit 4 and a material turning mechanism 5. The drum 2 is inclined on the bracket 1. The spraying mechanism 3 includes a spraying pipe 31, and the spraying pipe 31 is arranged inside the drum 2. The drum 2 includes a preheating section 21, a coating section 22 and a cooling section 23 which are connected in sequence from high to low. A first material turning plate 211 is arranged in the preheating section 21. The coating section 22 includes a spraying section 221 and a curing section 222 which are arranged at intervals along the axis, and the spraying section 221 and the curing section 222 are rotatably connected. More than two partition baffles 223 are arranged at the gap at the connection of the spraying section 221 and the curing section 222, and a gap 224 for the fertilizer to pass through is reserved between adjacent partition baffles 223. Driving units 4 are connected to both the spraying section 221 and the curing section 222, and the driving units 4 are fixed on the bracket 1. Material turning mechanisms 5 are arranged on both the spraying section 221 and the curing section 222. In this embodiment, the bracket 1 is of a frame structure and is fixedly installed on the ground. The drum 2 is of a cylindrical structure and can rotate relative to the bracket 1. Rings for supporting the spraying section 221 and the curing section 222 are arranged on the bracket 1. There are more than two rings, and the sum of the numbers of the spraying section 221 and the curing section 222 is equal to the number of the rings. The spraying section 221 and the curing section 222 are respectively rotatably connected to one of the rings, so that the driving unit 4 can drive the spraying section 221 and the curing section 222 to rotate. The preheating section 21, the coating section 22 and the cooling section 23 are coaxially arranged, and the preheating section 21 is located at the higher end and the cooling section 23 is located at the lower end. Therefore, when the drum 2 rotates, the fertilizer can gradually slide from the preheating section 21 to the cooling section 23 under the action of its own gravity. The provided preheating section 21 is used to preheat the fertilizer to soften its surface for coating. The first material turning plate 211 arranged in the preheating section 21 can provide a lifting force for the fertilizer during the rotation of the preheating section 21, drive the fertilizer to move to a high place and then fall, improve the rolling effect of the fertilizer, so that the heating and temperature rising process of the fertilizer is more uniform and improve the uniformity of its preheating. The provided coating section 22 is used to perform coating operations on the surface of the fertilizer. Among them, after the fertilizer enters the spraying section 221, the spraying pipe 31 sprays liquid coating material on the surface of the fertilizer to form a coating, and during the process of the fertilizer rolling with the spraying section 221, the coating thickness is made uniform. The curing section 222 is used to pre-cure the coating material, that is, the fertilizer completes one coating operation after passing through the spraying section 221 and the curing section 222. Therefore, the staff can set the numbers of the spraying section 221 and the curing section 222 according to the actual number of coating layers required to achieve segmented multiple coatings. And adopting segmented multiple coatings improves the coating uniformity and coating quality of the fertilizer.The provided cooling section 23 is used to cool the fertilizer after multiple coatings. The preheating section 21 is fixedly installed on the spraying section 221 at the highest point through fixing bolts, and the cooling section 23 is fixedly installed on the curing section 222 at the lowest point through fixing bolts. At the same time, partition baffles 223 are also provided at the connection between the preheating section 21 and the spraying section 221, and at the connection between the cooling section 23 and the curing section 222, and it is ensured that there are gaps 224 reserved between two adjacent partition baffles 223. More than two partition baffles 223 are arranged around the gap for separating the spraying section 221 and the curing section 222. During the rotation of the drum 2, the fertilizer located in the spraying section 221 rolls synchronously along the inner wall, which can ensure that the coating material is evenly wrapped on the surface of the fertilizer. The fertilizer located in the curing section 222 rolls synchronously along the inner wall, which can accelerate the pre-curing of the coating material to initially form a coating and ensure that the coating thickness is uniform and of good quality. There are more than two gaps 224. When the processing of the fertilizer in a certain working section is completed, it can enter the next working section through the gap 224. The partition baffle 223 can temporarily block the fertilizer, so that the fertilizer has sufficient processing time to avoid the situation that the sliding speed is too fast to achieve the effects of coating and pre-curing. The provided material turning mechanism 5 can provide a lifting force to the fertilizer during the rotation of the spraying section 221 and the curing section 222, drive the fertilizer to move to a high place and then fall, improve the rolling effect of the fertilizer, and further improve the uniformity of its coating, and avoid the adhesion between fertilizer particles, which helps to improve the processing quality. The spray pipe 31 is arranged parallel to the central axis of the drum 2. In addition, the components used in this device are all available on the market, so how to install and use it will not be elaborated here.

[0036] Specifically, the spraying mechanism 3 further includes a spraying machine main body 32, a batching tank 33, a vertical frame 34 and a nozzle 35. The spraying machine main body 32 is arranged on one side of the support 1. The input end of the spraying machine main body 32 is connected with a batching tank 33, the output end of the spraying machine main body 32 is connected with the spray pipe 31. Both ends of the spray pipe 31 are connected with a vertical frame 34. There are more than two nozzles 35 arranged on the spray pipe 31, and the nozzles 35 are located in the spraying section 221. In this embodiment, the spraying machine main body 32 is an existing technology in the field, which is used to realize the rapid extraction and spraying of the coating material. There are more than two batching tanks 33, and each batching tank 33 is connected with the input end of the spraying machine main body 32. Different types of coating materials are contained in each batching tank 33. The spraying machine main body 32 can correspondingly extract the coating materials from several batching tanks 33 according to the preset ratio to configure the coating material suitable for the fertilizer. After the coating material is configured, the spraying machine main body 32 will spray it from the nozzles 35 on the spray pipe 31 and make it wrap on the surface of the fertilizer. The vertical frame 34 is used to support both ends of the spray pipe 31, and the vertical frame 34 is fixedly installed on the ground.

[0037] Specifically, a hot air blower 212 is provided on the vertical frame 34 on one side of the preheating section 21. In this embodiment, the air outlet of the hot air blower 212 is aligned with the opening of the preheating section 21, and is used to blow hot air into the preheating section 21 to heat the fertilizer, thereby softening its surface and facilitating film coating.

[0038] Specifically, more than two sieve plates 231 are evenly embedded on the outer side wall of the cooling section 23, and cooling fans 232 are arranged on both sides of the cooling section 23. In this embodiment, through holes are evenly provided on the sieve plates 231, so that unqualified broken materials can be screened out through the through holes on the sieve plates 231 to ensure the uniformity of the fertilizer and improve the fertilizer quality. The cooling fans 232 are also provided with vertical frames, and the vertical frames are fixedly installed on the ground. The cooling fans 232 can generate cold air and blow the cold air into the cooling section 23 through the through holes on the sieve plates 231, thereby cooling and lowering the temperature of the fertilizer and completely solidifying the fertilizer.

[0039] Specifically, the driving unit 4 includes a reduction motor 41, a gear 42 and a toothed ring 43. The reduction motor 41 is fixedly arranged on the bracket 1, a gear 42 is connected to the power shaft of the reduction motor 41, and toothed rings 43 are arranged on the outer side walls of the spraying section 221 and the curing section 222. The toothed ring 43 meshes with the gear 42, and the number of the toothed rings 43 is equal to and corresponds to the number of the gears 42 one by one. In this embodiment, there are more than two reduction motors 41, and the number of the reduction motors 41 is equal to and corresponds to the number of the toothed rings 43 one by one. A plurality of reduction motors 41 for driving the spraying section 221 to rotate are all located on the same side of the bracket 1, and a plurality of reduction motors 41 for driving the curing section 222 to rotate are all located on the other side of the bracket 1. The reduction motor 41 is used to drive the gear 42 to rotate, thereby driving the toothed ring 43 to rotate synchronously. When the toothed ring 43 rotates, it will drive the spraying section 221 and the curing section 222 to rotate synchronously, and the rotation speed of the reduction motor 41 for driving the curing section 222 to rotate is greater than the rotation speed of the reduction motor 41 for driving the spraying section 221 to rotate. By increasing the rotation speed of the curing section 222, the curing of the film coating on the outer surface of the fertilizer is accelerated, thereby realizing the primary pre-curing effect of the fertilizer and avoiding the phenomenon that the film coating material becomes loose and detaches from the fertilizer.

[0040] Specifically, the material turning mechanism 5 includes a second material turning plate 51, a limiting rod 52, a slider 53, a spring 54 and a guide arc plate 55. The spray section 221 and the curing section 222 are both provided with more than two clearance holes 56. The limiting rods 52 are provided at both ends of the clearance holes 56. The limiting rods 52 are slidably connected to the slider 53. The spring 54 is sleeved on the limiting rod 52. One end of the spring 54 is connected to the limiting rod 52, and the other end of the spring 54 is connected to the slider 53. The second material turning plate 51 is also slidably connected in the clearance hole 56, and one end of the slider 53 is connected to the second material turning plate 51. The guide arc plate 55 is fixed on the bracket 1, and the inner arc surface of the guide arc plate 55 is in contact with the second material turning plate 51. In this embodiment, the first material turning plate 211 and the second material turning plate 51 are both arranged vertically with the partition baffle 223, and the positions of the first material turning plate 211 and the second material turning plate 51 are aligned with the position of the notch 224. The size of the second turning plate 51 should be adapted to the size of the clearance hole 56, and ensure that after the second turning plate 51 is installed in the clearance hole 56, the fertilizer will not leak from the gap between the second turning plate 51 and the clearance hole 56. The limiting rod 52 is a straight rod, and one end of the limiting rod 52 is fixedly connected to the inner wall of the clearance hole 56. The slider 53 is an L-shaped block, and a sliding hole is provided on the slider 53. After the limiting rod 52 passes through the sliding hole, it is slidably connected to the slider 53, so that the slider 53 can slide along the axial direction of the limiting rod 52. The spring 54 is fixedly mounted on the side of the slider 53 away from the bracket 1. When the second flipping plate 51 rotates to contact the guide arc plate 55, the outer end of the guide arc plate 55 will squeeze the second flipping plate 51 toward the side close to the spray pipe 31. At this time, the upper part of the second flipping plate 51 protrudes into the interior of the drum 2, and then the fertilizer can be driven to move when the drum 2 rotates. On the contrary, after the second flipping plate 51 slides over the guide arc plate 55, the elastic force of the spring 54 will pull the second flipping plate 51 to reset. At this time, the upper part of the second flipping plate 51 retracts into the clearance hole 56 again, and the lower part of the second flipping plate 51 moves outside the drum 2, and then no longer drives the fertilizer to continue to move, so that the fertilizer slides down under the action of gravity. An opening aligned with the position of the second flipping plate 51 is also provided on the gear ring 43, so as to prevent the second flipping plate 51 from interfering with the gear ring 43 during the reciprocating movement.

[0041] Specifically, the curvature of the guide arc plate 55 is 0 to π / 4 rad. In this embodiment, the guide arc plate 55 is fixedly mounted on the bracket 1, and the two ends of the guide arc plate 55 are arranged symmetrically front and back along the vertical plane. Since the maximum curvature of the guide arc plate 55 is π / 4 rad, the sliding angle of the second turning plate 51 on the guide arc plate 55 does not exceed 45°, so that the fertilizer rolls naturally inside the drum 2 as it rolls, avoiding the continuous lifting of the fertilizer, causing the fertilizer to be thrown down, which is easy to cause collision damage between fertilizers or adhesion at the coating, thereby improving the uniformity of the fertilizer coating and the pre-curing effect.

[0042] This embodiment also provides a coating method based on a dynamic variable segmented drum coating device, comprising the following steps:

[0043] S1. Add the fertilizer into the drum 2 from one side of the preheating section 21, and start the reduction motor 41 to drive the drum 2 to rotate, so that the fertilizer can slide down along the inner wall of the drum 2 while rolling. Specifically, when in use, add the fertilizer to be coated into the preheating section 21, and then start the reduction motor 41. The reduction motor 41 drives the gear 42 to rotate, and the rotation of the gear 42 drives the gear ring 43 to rotate. The rotation of the gear ring 43 drives the preheating section 21, the spraying section 221, the curing section 222 and the cooling section 23 to rotate synchronously. When the spraying section 221 and the curing section 222 rotate, the second turning plate 51 is driven. When the second turning plate 51 contacts the guide arc plate 55 and slides along the inner wall of the guide arc plate 55, the outward-stretched structure at the outer end of the guide arc plate 55 squeezes the second turning plate 51 toward the spray pipe 31, so that the top of the second turning plate 51 protrudes into the inside of the drum 2, thereby driving the fertilizer to move. After the second turning plate 51 slides over the guide arc plate 55, the elastic force of the spring 54 causes the second turning plate 51 to retract into the clearance hole 56, and no longer drives the fertilizer to move, thereby causing the fertilizer to slide down, while ensuring that the rotation speed of the curing section 222 should be greater than the rotation speed of the spray section 221.

[0044] S2, start the hot air blower 212 to preheat the fertilizer in the preheating section 21 to soften its surface for easy coating. At the same time, when the preheating section 21 rotates, the first turning plate 211 will provide a lifting force for the fertilizer, driving the fertilizer to move to a high place and then fall down, thereby improving the rolling effect of the fertilizer, so that the heating process of the fertilizer is more uniform, and the uniformity of its preheating is improved;

[0045] S3, after the fertilizer is preheated, it will enter the spray section 221 through the gap 224, and the sprayer main unit 32 will be started. The sprayer main unit 32 will extract the wrapping material from the plurality of batching tanks 33 according to the preset ratio, and then prepare the coating material, and then transport the coating material to the nozzle 35 through the spray pipe 31 for spraying, so as to coat the fertilizer. When the fertilizer is processed in the spray section 221, the second turning plate 51 will drive the fertilizer to move, so as to improve the rolling effect of the fertilizer, and thus improve the uniformity of its coating;

[0046] S4. After the fertilizer coating is completed, it will enter the curing section 222 through the gap 224 for pre-curing. When the fertilizer is processed in the curing section 222, the second turning plate 51 will drive the fertilizer to move, thereby improving the rolling effect of the fertilizer portion, thereby accelerating the curing of the fertilizer outer coating, and achieving the effect of pre-curing the fertilizer once;

[0047] S5. The pre-cured fertilizer will enter the next spraying section 221 and repeat steps S3 - S4 to achieve multiple coatings on the fertilizer. By adopting a segmented multiple coating method, the coating uniformity and quality of the fertilizer are improved.

[0048] S6. The fertilizer after multiple coatings will enter the cooling section 23 through the notch 224. Start the cooling fan 232. The cooling fan 232 blows cold air into its interior through the through-holes of the sieve plate 231, thereby cooling and lowering the temperature of the fertilizer to completely solidify the fertilizer. At the same time, the rotation of the cooling section 23 will also screen out unqualified broken materials through the through-holes on the sieve plate 231 to ensure the uniformity of the fertilizer, and the cooling fan 232 can accelerate the solidification of the fertilizer coating.

[0049] The present invention is described by preferred embodiments. Those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited by the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of this application belong to the protection scope of the present invention.

Claims

1. Based on the dynamic variable segmented drum coating device, it is characterized by: The invention comprises a support (1), a rotating drum (2), a spray mechanism (3), a driving unit (4) and a material turning mechanism (5); the support (1) is provided with a rotating drum (2) at an angle; the spray mechanism (3) comprises a spray pipe (31); the spray pipe (31) is arranged in the rotating drum (2); the rotating drum (2) comprises a preheating section (21), a coating section (22) and a cooling section (23) which are connected in sequence from high to low; a first material turning plate (211) is arranged in the preheating section (21); the coating section (22) comprises a spray section (221) and a curing section (23) which are arranged at intervals along the axis. (222), and the spray section (221) and the solidification section (222) are rotatably connected, two or more partition baffles (223) are arranged at the gap at the connection between the spray section (221) and the solidification section (222), and gaps (224) for fertilizer to pass through are reserved between adjacent partition baffles (223), the spray section (221) and the solidification section (222) are both connected to a driving unit (4), and the driving unit (4) is fixed on a bracket (1), and the spray section (221) and the solidification section (222) are both provided with a material turning mechanism (5).

2. The dynamic variable segmented drum coating device according to claim 1 is characterized in that: The spray mechanism (3) further comprises a spray machine main unit (32), a material mixing tank (33), a stand (34) and a spray head (35); the spray machine main unit (32) is arranged on one side of the bracket (1); the input end of the spray machine main unit (32) is connected to the material mixing tank (33); the output end of the spray machine main unit (32) is connected to the spray pipe (31); both ends of the spray pipe (31) are connected to the stand (34); more than two spray heads (35) are arranged on the spray pipe (31), and the spray heads (35) are located in the spray section (221).

3. The dynamic variable segmented drum coating device according to claim 2 is characterized in that: A hot air blower (212) is arranged on the stand (34) located on one side of the preheating section (21).

4. The dynamic variable segmented drum coating device according to claim 2 is characterized in that: More than two sub-screen plates (231) are evenly embedded on the outer wall of the cooling section (23), and cooling fans (232) are arranged on both sides of the cooling section (23).

5. The dynamic variable segmented drum coating device according to claim 1 is characterized in that: The driving unit (4) comprises a reduction motor (41), a gear (42) and a gear ring (43); the reduction motor (41) is fixedly mounted on the bracket (1); the gear (42) is connected to the power shaft of the reduction motor (41); the outer side walls of the spray section (221) and the curing section (222) are both provided with a gear ring (43); the gear ring (43) and the gear (42) are meshed with each other, and the number of the gear rings (43) and the gear (42) are equal and one-to-one corresponding.

6. The dynamic variable segmented drum coating device according to claim 1 is characterized in that: The material turning mechanism (5) comprises a second material turning plate (51), a limiting rod (52), a slider (53), a spring (54) and a guide arc plate (55). The spray section (221) and the curing section (222) are both provided with more than two clearance holes (56). Limiting rods (52) are provided at both ends of the clearance holes (56). The limiting rod (52) is slidably connected with the slider (53). The spring (54) is sleeved on the limiting rod (52). One end of the spring (54) is connected to the limiting rod (52), and the other end of the spring (54) is connected to the slider (53). The second material turning plate (51) is also slidably connected in the clearance hole (56), and one end of the slider (53) is connected to the second material turning plate (51). The guide arc plate (55) is fixed on the bracket (1), and the inner arc surface of the guide arc plate (55) is in contact with the second material turning plate (51).

7. The dynamic variable segmented drum coating device according to claim 6 is characterized in that: The curvature of the guide arc plate (55) is 0-π / 4 rad.

8. The coating method based on the dynamic variable segmented drum coating device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, adding fertilizer from one side of the preheating section (21) into the rotating drum (2), and starting the reduction motor (41) to drive the rotating drum (2) to rotate, so that the fertilizer can slide down along the inner wall of the rotating drum (2) while rolling; S2, starting the hot air blower (212) to preheat the fertilizer in the preheating section (21) to soften its surface for easy coating; S3, after the fertilizer is preheated, it will enter the spraying section (221), and the spraying machine main unit (32) will be started. The spraying machine main unit (32) will extract the wrapping material from the batching tank (33) according to a preset ratio, and then prepare the coating material, and then transport the coating material to the spray head (35) through the spraying pipe (31) to spray it out, so as to coat the fertilizer; S4, after the fertilizer coating is completed, it will enter the curing section (222) for pre-curing; S5, the pre-cured fertilizer will enter the next spraying section (221), and steps S3 to S4 will be repeated to achieve multiple coating of the fertilizer; S6. After multiple coatings, the fertilizer enters the cooling section (23). The air cooler (232) is started and blows cold air into the interior through the through holes of the sieve plate (231), thereby cooling the fertilizer and completely solidifying the fertilizer. At the same time, the rotation of the cooling section (23) will also screen out unqualified broken materials through the through holes on the sieve plate (231) to ensure the uniformity of the fertilizer.

9. The coating method based on the dynamic variable segmented drum coating device according to claim 8 is characterized in that: In step S1, during the rotation of the drum (2), the second flipping plate (51) is driven to rotate synchronously. When the second flipping plate (51) contacts the guide arc plate (55) and slides along the inner wall of the guide arc plate (55), the second flipping plate (51) protrudes into the interior of the drum (2), thereby driving the fertilizer to move. After the second flipping plate (51) slides over the guide arc plate (55), the elastic force of the spring (54) causes the second flipping plate (51) to retract into the clearance hole (56), thereby causing the fertilizer to slide off.

10. The coating method based on the dynamic variable segmented drum coating device according to claim 9, characterized in that: In step S1, the rotation speed of the curing section (222) should be greater than the rotation speed of the spraying section (221).

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