Dynamic variable segmented rotary drum coating device and coating method

Abstract

This invention discloses a segmented rotary drum coating device and method based on dynamic variables, relating to the field of fertilizer processing technology. A rotary drum is inclinedly mounted on a support frame. A spraying mechanism includes spray pipes disposed within the rotary drum. The drum comprises a preheating section, a coating section, and a cooling section connected sequentially from high to low. A first turning plate is provided within the preheating section. The coating section includes spraying sections and curing sections arranged at intervals along the axis, rotatably connected. Two or more partition baffles are provided at the joint between the spraying and curing sections, with a notch reserved between adjacent partition baffles for fertilizer passage. A drive unit is connected to both the spraying and curing sections and fixed to the support frame. A turning mechanism is also provided on both the spraying and curing sections. This invention employs a segmented, multi-coating processing method, which not only improves the uniformity and quality of fertilizer coating but also avoids fertilizer adhesion and waste of coating material.

Description

Technical Field

[0001] This invention relates to the field of fertilizer processing technology, and more specifically, to a segmented rotary drum coating device based on dynamic variables and its coating method. Background Technology

[0002] Coated controlled-release fertilizers are produced by spraying various polymer materials onto the surface of fertilizer granules using physical or chemical methods. The coating material is then dried or cured through a reaction to form a dense film, thereby controlling the release of fertilizer nutrients. Drum coating is one method of fertilizer coating. After screening, the fertilizer is fed into a drum, which rotates, causing the fertilizer to roll inside. This allows the coating material to be sprayed onto the fertilizer, creating a coating layer on its surface.

[0003] Existing coating processes are generally completed in one step. However, in actual production, if the coating thickness is relatively thick, a single spray coating is not enough to form a uniform coating layer on the fertilizer surface. Spraying too much coating material at once can also easily cause fertilizers to stick together and waste the coating material. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention proposes a segmented rotary drum coating device based on dynamic variables, which adopts a segmented, multi-coating processing method. This not only improves the uniformity and quality of fertilizer coating, but also avoids the adhesion between fertilizers and the waste of coating material, thus showing good market application prospects.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This invention provides a segmented rotary drum coating device based on dynamic variables, including a support, a rotary drum, a spraying mechanism, a drive unit, and a material turning mechanism. The rotary drum is inclinedly mounted on the support. The spraying mechanism includes a spray pipe disposed inside the rotary drum. The rotary drum includes a preheating section, a coating section, and a cooling section connected sequentially from high to low. A first material turning plate is disposed in the preheating section. The coating section includes a spraying section and a curing section arranged at intervals along the axis, and the spraying section and the curing section are rotatably connected. Two or more partition baffles are disposed at the gap at the connection between the spraying section and the curing section, and a gap for fertilizer to pass through is reserved between adjacent partition baffles. A drive unit is connected to both the spraying section and the curing section, and the drive unit is fixed on the support. A material turning mechanism is disposed on both the spraying section and the curing section.

[0007] In a preferred embodiment of the present invention, the spraying mechanism further includes a spraying machine main unit, a mixing tank, a support frame, and spray nozzles. The spraying machine main unit is disposed on one side of the support frame. The input end of the spraying machine main unit is connected to the mixing tank, and the output end of the spraying machine main unit is connected to the spraying pipe. Support frames are connected to both ends of the spraying pipe, and two or more spray nozzles are disposed on the spraying pipe, with the spray nozzles located within the spraying section.

[0008] In a preferred embodiment of the present invention, a hot air blower is provided on the upright frame located on one side of the preheating section.

[0009] In a preferred embodiment of the present invention, two or more sieve plates are uniformly embedded on the outer wall of the cooling section, and cold air blowers are provided on both sides of the cooling section.

[0010] In a preferred embodiment of the present invention, the drive unit includes a geared motor, a gear, and a gear ring. The geared motor is fixed on the bracket, and a gear is connected to the drive shaft of the geared motor. Gear rings are provided on the outer walls of both the spray section and the curing section. The gear rings mesh with the gears, and the number of gear rings and gears are equal and correspond one-to-one.

[0011] In a preferred embodiment of the present invention, the material turning mechanism includes a second material turning plate, a limiting rod, a slider, a spring, and a guide arc plate. Both the spraying section and the curing section are provided with two or more clearance holes. Limiting rods are provided at both ends of the clearance holes. A slider is slidably connected to the limiting rod. A 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 turning plate is also slidably connected inside the clearance hole, and one end of the slider is connected to the second material turning plate. The guide arc plate is fixed on the bracket, and the inner arc surface of the guide arc plate abuts against the second material turning plate.

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

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

[0014] S1. Add fertilizer into the drum from one side of the preheating section and start the geared motor to drive the drum to rotate, so that the fertilizer can slide down 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 and make it easier to coat.

[0016] S3. After the fertilizer is preheated, it will enter the spraying section. Start the spraying machine host. The spraying machine host will extract the coating material from the mixing tank according to the preset ratio, mix it to obtain the coating material, and then transport the coating material through the spray pipe to the nozzle to spray it out to coat the fertilizer.

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

[0018] S5. After pre-curing, the fertilizer will enter the next spraying section and repeat steps S3 to S4 to achieve multiple coatings on the fertilizer.

[0019] S6. After multiple coating processes, the fertilizer will enter the cooling section. The cold air fan will be turned on and blow cold air into the fertilizer through the through holes of the sieve plate to cool it down and make it completely solidify. At the same time, the rotation of the cooling section will also screen out unqualified fragments through the through holes of the sieve plate to ensure the uniformity of the fertilizer.

[0020] In a preferred embodiment of the present invention, in step S1, during the rotation of the drum, the second tilting plate will rotate synchronously. When the second tilting plate contacts the guide arc plate and slides along the inner side wall of the guide arc plate, the second tilting plate will protrude into the interior of the drum, thereby driving the fertilizer to move. After the second tilting plate slides past the guide arc plate, under the action of the spring force, the second tilting plate will retract into the clearance hole, thereby causing the fertilizer to slide down.

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

[0022] The beneficial effects of this invention are as follows:

[0023] 1. The dynamic variable segmented rotary drum coating device proposed in this invention adopts a segmented multi-coating processing method, which not only improves the uniformity and quality of fertilizer coating, but also avoids the adhesion between fertilizers and the waste of coating material, and has good market application prospects.

[0024] 2. In this invention, adjacent spraying sections and curing sections form a coating processing unit, and several coating processing units form a coating section. By adjusting the number of coating processing units, the number of times fertilizer is coated can be easily controlled, thus enabling the processing of different types of fertilizers.

[0025] 3. In the coating process, 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 the adhered coating to cure, thereby achieving pre-curing, improving the effect of fertilizer coating, making the coating material less likely to fall off, ensuring the integrity of the fertilizer coating, and improving the coating quality. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the segmented rotating drum film-coating device based on dynamic variables provided in a specific embodiment of the present invention;

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

[0028] Figure 3 This is a schematic diagram of the structure of the drum viewed from the right.

[0029] Figure 4 This is a structural schematic diagram of the drum from the main view direction;

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

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

[0032] In the picture:

[0033] 1. Support frame; 2. Drum; 21. Preheating section; 211. First turning plate; 212. Hot air blower; 22. Coating section; 221. Spraying section; 222. Curing section; 223. Separating baffle; 224. Notch; 23. Cooling section; 231. Screening plate; 232. Cold air blower; 3. Spraying mechanism; 31. Spray pipe; 32. Main unit of spraying machine; 33. Mixing tank; 34. Stand; 35. Spray head; 4. Drive unit; 41. Gear motor; 42. Gear; 43. Gear ring; 5. Turning mechanism; 51. Second turning plate; 52. Limiting rod; 53. Slider; 54. Spring; 55. Guide arc plate; 56. Clearance hole. Detailed Implementation

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1-6As shown, the embodiment provides a segmented rotary drum coating device based on dynamic variables, including a support 1, a rotary drum 2, a spraying mechanism 3, a drive unit 4, and a turning mechanism 5. The rotary drum 2 is inclinedly arranged on the support 1. The spraying mechanism 3 includes a spray pipe 31 disposed inside the rotary drum 2. The rotary drum 2 includes a preheating section 21, a coating section 22, and a cooling section 23 connected sequentially from high to low. A first turning plate 211 is disposed inside the preheating section 21. The coating section 22 includes sections spaced apart along the axis. The system comprises a spraying section 221 and a curing section 222, which are rotatably connected. Two or more partition baffles 223 are installed at the joint between the spraying section 221 and the curing section 222. A notch 224 for fertilizer passage is reserved between adjacent partition baffles 223. A drive unit 4 is connected to both the spraying section 221 and the curing section 222, and the drive unit 4 is fixed to the support 1. A material turning mechanism 5 is also provided on both the spraying section 221 and the curing section 222. In this embodiment, the support 1 is a frame structure, fixedly installed on the ground, and the drum 2 is a cylindrical structure capable of rotating relative to the support 1. The support frame 1 is provided with two or more rings to support the spraying section 221 and the curing section 222, and the total number of spraying sections 221 and curing sections 222 is equal to the number of rings. Each spraying section 221 and curing section 222 is rotatably connected to one of the rings, thereby enabling the drive unit 4 to 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 arranged coaxially, with the preheating section 21 located at the higher end and the cooling section 23 located at the lower end. This allows the fertilizer to gradually slide from the preheating section 21 into the cooling section 23 under its own gravity when the drum 2 rotates. The preheating section 21 is used to preheat the fertilizer, softening its surface to facilitate coating. The first turning plate 211 located in the preheating section 21 can provide lifting force to the fertilizer during the rotation of the preheating section 21, moving the fertilizer to a high place and then falling down, 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. The coating section 22 is used to coat the fertilizer surface. After the fertilizer enters the spraying section 221, liquid coating material is sprayed onto the fertilizer surface by the spray pipe 31 to form a coating. As the fertilizer rolls along with the spraying section 221, the coating thickness is made uniform. The curing section 222 is used to pre-cur 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 number of spraying sections 221 and curing sections 222 can be set according to the actual number of coating layers required to achieve segmented and multiple coatings. The segmented and multiple coating improves the uniformity and quality of fertilizer coating.The cooling section 23 is used to cool the fertilizer after multiple coating processes. The preheating section 21 is fixedly installed to the spraying section 221 at the highest point using fixing bolts, and the cooling section 23 is fixedly installed to the curing section 222 at the lowest point using fixing bolts. Separating baffles 223 are also provided at the connection points between the preheating section 21 and the spraying section 221, and between the cooling section 23 and the curing section 222, ensuring that a gap 224 is reserved between any two connected separating baffles 223. Two or more separating baffles 223 are arranged around the gap to separate the spraying section 221 and the curing section 222. During the rotation of the drum 2, the fertilizer in the spraying section 221 rolls synchronously along the inner wall, ensuring that the coating material is evenly wrapped around the fertilizer surface. Meanwhile, the fertilizer in the curing section 222 rolls synchronously along the inner wall, accelerating the pre-curing of the coating material to initially form a coating and ensuring uniform coating thickness and good quality. There are two or more notches 224. After the fertilizer in one working section is processed, it can enter the next working section through the notch 224. The partition baffle 223 can temporarily block the fertilizer, allowing sufficient processing time and preventing it from sliding too quickly and failing to achieve the coating and pre-curing effects. The material turning mechanism 5 provides lifting force to the fertilizer during the rotation of the spraying section 221 and the curing section 222, moving the fertilizer to a higher position before it falls, improving the rolling effect of the fertilizer, thereby improving the uniformity of its coating and preventing the fertilizer particles from sticking together, which helps to improve the processing quality. The spray pipe 31 is arranged parallel to the central axis of the rotating drum 2. In addition, all the parts used in this device are commercially available, so how to install and use them will not be described here.

[0036] Specifically, the spraying mechanism 3 also includes a spraying machine main unit 32, a mixing tank 33, a support frame 34, and spray nozzles 35. The spraying machine main unit 32 is located on one side of the support frame 1. The input end of the spraying machine main unit 32 is connected to the mixing tank 33, and the output end of the spraying machine main unit 32 is connected to the spraying pipe 31. The support frame 34 is connected to both ends of the spraying pipe 31. The spraying pipe 31 is equipped with two or more spray nozzles 35, and the spray nozzles 35 are located within the spraying section 221. In this embodiment, the spraying machine main unit 32 is a prior art technology used to achieve rapid extraction and spraying of the coating material. There are two or more mixing tanks 33, and each mixing tank 33 is connected to the input end of the spraying machine main unit 32. Each mixing tank 33 contains different types of coating materials. The spraying machine main unit 32 can extract the corresponding coating materials from several mixing tanks 33 according to a preset ratio to prepare a coating material suitable for fertilizer. After the coating material is prepared, the main unit 32 of the spraying machine will spray it out from the nozzle 35 on the spray pipe 31, and coat it with fertilizer. The stand 34 is used to support both ends of the spray pipe 31, and the stand 34 is fixedly installed on the ground.

[0037] Specifically, a hot air blower 212 is installed on the stand 34 located 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 to blow hot air into the preheating section 21 to heat the fertilizer, thereby softening its surface and facilitating coating.

[0038] Specifically, two or more sieve plates 231 are evenly embedded on the outer wall of the cooling section 23, and air coolers 232 are installed on both sides of the cooling section 23. In this embodiment, the sieve plates 231 are evenly provided with through holes, so that unqualified fragments can be screened out through the through holes of the sieve plates 231 to ensure the uniformity of the fertilizer and improve the quality of the fertilizer. The air coolers 232 are also provided with a stand, and the stand is fixedly installed on the ground. The air coolers 232 can generate cold air and blow cold air into the cooling section 23 through the through holes of the sieve plates 231, thereby cooling and lowering the temperature of the fertilizer and allowing the fertilizer to solidify completely.

[0039] Specifically, the drive unit 4 includes a reduction motor 41, a gear 42, and a gear ring 43. The reduction motor 41 is fixed on the bracket 1, and the gear 42 is connected to the drive shaft of the reduction motor 41. Gear rings 43 are provided on the outer walls of both the spray section 221 and the curing section 222. The gear rings 43 mesh with the gears 42, and the number of gear rings 43 and gears 42 is equal and corresponds one-to-one. In this embodiment, there are two or more reduction motors 41, and the number of reduction motors 41 is equal to the number of gear rings 43 and corresponds one-to-one. The reduction motors 41 used to drive the rotation of the spray section 221 are all located on the same side of the bracket 1, and the reduction motors 41 used to drive the rotation of the curing section 222 are all located on the other side of the bracket. The geared motor 41 drives the gear 42 to rotate, which in turn drives the gear ring 43 to rotate synchronously. The rotation of the gear ring 43 will drive the spraying section 221 and the curing section 222 to rotate synchronously. The speed of the geared motor 41 used to drive the curing section 222 is greater than that of the geared motor 41 used to drive the spraying section 221. By increasing the speed of the curing section 222, the curing of the coating on the fertilizer surface is accelerated, thereby achieving a one-time pre-curing effect on the fertilizer and preventing the coating material from loosening and detaching from the fertilizer.

[0040] Specifically, the material turning mechanism 5 includes a second turning plate 51, a limiting rod 52, a slider 53, a spring 54, and a guide arc plate 55. Both the spraying section 221 and the curing section 222 are provided with two or more clearance holes 56. Limiting rods 52 are provided at both ends of the clearance holes 56. A slider 53 is slidably connected to the limiting rod 52. A spring 54 is sleeved on the limiting rod 52, with one end connected to the limiting rod 52 and the other end connected to the slider 53. The second turning plate 51 is also slidably connected inside the clearance hole 56, and one end of the slider 53 is connected to the second turning plate 51. The guide arc plate 55 is fixed to the bracket 1, and its inner arc surface abuts against the second turning plate 51. In this embodiment, both the first turning plate 211 and the second turning plate 51 are arranged perpendicularly to the partition baffle 223, and the positions of both the first turning plate 211 and the second turning plate 51 are aligned with the position of the notch 224. The dimensions of the second tilting plate 51 should be compatible with the dimensions of the clearance hole 56, ensuring that fertilizer does not leak from the gap between the second tilting plate 51 and the clearance hole 56 after the second tilting plate 51 is installed into 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 with a sliding hole. The limiting rod 52 passes through the sliding hole and slides with the slider 53, thereby allowing the slider 53 to slide along the axial direction of the limiting rod 52. Spring 54 is fixedly installed on the side of slider 53 away from bracket 1. When the second tilting plate 51 rotates to contact the guide arc plate 55, the outward-expanding structure at the outer end of the guide arc plate 55 will press the second tilting plate 51 towards the spray pipe 31. At this time, the upper part of the second tilting plate 51 protrudes into the interior of the drum 2, thus driving the fertilizer to move when the drum 2 rotates. Conversely, when the second tilting plate 51 slides past the guide arc plate 55, it will be pulled back to its original position by the elastic force of spring 54. At this time, the upper part of the second tilting plate 51 retracts back into the clearance hole 56, and the lower part of the second tilting plate 51 moves outside the drum 2, thus no longer driving the fertilizer to continue moving, allowing the fertilizer to slide down under the action of gravity. An opening aligned with the position of the second tilting plate 51 is also provided on the toothed ring 43 to avoid interference between the second tilting plate 51 and the toothed ring 43 during 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 installed on the bracket 1, and the two ends of the guide arc plate 55 are symmetrically arranged 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 flipping plate 51 on the guide arc plate 55 does not exceed 45°, thereby allowing the fertilizer to roll naturally inside the drum 2 as it rolls, avoiding the continuous upward movement of the fertilizer, which could cause the fertilizer to be thrown downwards, easily resulting in collision damage between fertilizers or adhesion at the coating, thus 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 rotary drum coating device, including the following steps:

[0043] S1. Add fertilizer to the rotating drum 2 from one side of the preheating section 21, and start the reduction motor 41 to drive the rotating drum 2 to rotate, so that the fertilizer can slide down the inner wall of the rotating drum 2 while rolling. In specific 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, the gear 42 rotates and drives the gear ring 43 to rotate, and the gear ring 43 rotates and drives the preheating section 21, spraying section 221, curing section 222 and cooling section 23 to rotate synchronously. At the same time as the spraying section 221 and curing section 222 rotate, the second turning plate 51 will be driven. When the second tilting plate 51 contacts the guide arc plate 55 and slides along the inner wall of the guide arc plate 55, the outward-expanding structure at the outer end of the guide arc plate 55 will press the second tilting plate 51 towards the spray pipe 31, thereby causing the top of the second tilting plate 51 to protrude into the interior of the drum 2, thus driving the fertilizer to move. When the second tilting plate 51 slides past the guide arc plate 55, under the action of the spring force of the spring 54, the second tilting plate 51 will retract into the relief hole 56 and no longer drive the fertilizer to move, thus causing the fertilizer to slide down. At the same time, it is ensured that the rotation speed of the curing section 222 is 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, softening its surface to facilitate coating. At the same time, when the preheating section 21 rotates, the first tipping plate 211 will provide lifting force to the fertilizer, moving the fertilizer to a high place and then falling down, 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 spraying section 221 through the notch 224. The spraying machine host 32 is started. The spraying machine host 32 extracts the coating material from several mixing tanks 33 according to the preset ratio, and then mixes it to obtain the coating material. The coating material is then transported to the nozzle 35 through the spray pipe 31 and sprayed out to coat the fertilizer. When the fertilizer is processed in the spraying section 221, the second turning plate 51 will drive the fertilizer to move, 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 notch 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, improve the rolling effect of the fertilizer, and thus accelerate the curing of the fertilizer coating, achieving the effect of one-time pre-curing of the fertilizer.

[0047] S5. After pre-curing, the fertilizer will enter the next spraying section 221 and repeat steps S3 to S4 to achieve multiple coatings on the fertilizer. The segmented multiple coating method improves the uniformity and quality of the fertilizer coating.

[0048] S6. After multiple coating processes, the fertilizer enters the cooling section 23 through the notch 224. The cold air fan 232 is started, and the cold air fan 232 blows cold air into the fertilizer through the through holes of the sieve plate 231, thereby cooling the fertilizer and making it completely solidify. At the same time, the rotation of the cooling section 23 will also screen out unqualified fragments through the through holes on the sieve plate 231 to ensure the uniformity of the fertilizer. The cold air fan 232 can accelerate the solidification of the fertilizer coating.

[0049] This invention has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. This invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims are also within the protection scope of this invention.

Claims

1. A dynamic variable segmental drum-based encapsulation device, characterized by: The utility model provides a fertilizer coating machine, including support (1), rotary drum (2), spray mechanism (3), drive unit (4) and material turning mechanism (5), support (1) is provided with rotary drum (2) in the inclination, spray mechanism (3) includes spray pipe (31), and spray pipe (31) is set up in rotary drum (2), rotary drum (2) includes by high to low sequentially connected preheating section (21), coating section (22) and cooling section (23), and preheating section (21) is provided with first material turning plate (211), coating section (22) includes the spray section (221) and solidification section (222) of interval arrangement along the axis, and spray section (221) and solidification section (222) are rotationally connected between, and the gap of spray section (221) and solidification section (222) connection place is provided with two or more than two separation baffle (223), and the gap (224) for fertilizer is reserved between adjacent separation baffle (223), and spray section (221) and solidification section (222) are all connected with drive unit (4), and drive unit (4) is fixedly arranged on support (1), and spray section (221) and solidification section (222) are all provided with material turning mechanism (5). The material turning mechanism (5) includes a second material turning plate (51), a limiting rod (52), a sliding block (53), a spring (54), and a guide arc plate (55). The spray section (221) and the solidification section (222) are each provided with two or more than two accommodating holes (56). The limiting rod (52) is arranged at both ends of the accommodating hole (56). The sliding block (53) is slidably connected to the limiting rod (52). The spring (54) is sleeved on the limiting rod (52). One end of the spring (54) is connected to the limiting rod (52). The other end of the spring (54) is connected to the sliding block (53). The second material turning plate (51) is slidably connected to the accommodating hole (56). One end of the sliding block (53) is connected to the second material turning plate (51). The guide arc plate (55) is fixedly arranged on the support (1). The inner arc surface of the guide arc plate (55) is in abutting engagement with the second material turning plate (51). The curvature of the guide arc plate (55) is 0~π / 4 rad.

2. The dynamic variable segmental drum-based encapsulation device of claim 1, wherein: The spray mechanism (3) further includes a spraying machine host (32), a batching tank (33), a stand (34), and a spray head (35). The spraying machine host (32) is arranged on one side of the support (1). The input end of the spraying machine host (32) is connected to the batching tank (33). The output end of the spraying machine host (32) is connected to the spray pipe (31). The stand (34) is connected to both ends of the spray pipe (31). The spray pipe (31) is provided with two or more than two spray heads (35), and the spray heads (35) are located in the spray section (221).

3. The dynamic variable segmental drum-based encapsulation device of claim 2, wherein: A hot air blower (212) is arranged on the stand (34) on one side of the preheating section (21).

4. The dynamic variable segmental drum-based encapsulation device of claim 2, wherein: Two or more than two sieve plates (231) are uniformly embedded on the outer side wall of the cooling section (23). Cold air blowers (232) are arranged on both sides of the cooling section (23).

5. The dynamic variable segmental drum-based encapsulation device of claim 1, wherein: The driving unit (4) comprises a speed reducer motor (41), a gear (42) and a gear ring (43), the speed reducer motor (41) is fixed on the support (1), the power shaft of the speed reducer motor (41) is connected with the gear (42), the outer side wall of the spraying section (221) and the curing section (222) is provided with the gear ring (43), the gear ring (43) and the gear (42) are engaged with each other, and the number of the gear ring (43) and the gear (42) is equal and one-to-one correspondence.

6. A process for encapsulation using a dynamic variable segmental drum-based encapsulation apparatus as claimed in any one of claims 1 to 5, wherein, The method comprises the following steps: S1, the fertilizer is added to the rotary drum (2) from the preheating section (21) side, and the speed reducer motor (41) is started to drive the rotary drum (2) to rotate, so that the fertilizer can slide down along the inner side wall of the rotary drum (2) while rolling; S2, the hot air blower (212) is started to preheat the fertilizer in the preheating section (21), so that the surface is softened, and the coating is facilitated; S3, after the preheating of the fertilizer, the spraying section (221) is entered, the spraying machine host (32) is started, the coating material is obtained by extracting the wrapping material from the batching tank (33) according to the preset proportion, and the coating material is delivered to the nozzle (35) through the spraying pipe (31) to be sprayed out, and the coating operation is carried out on the fertilizer; S4, after the coating of the fertilizer is completed, the curing section (222) is entered for pre-curing; S5, after the pre-curing of the fertilizer, the next spraying section (221) is entered, and steps S3-S4 are repeated to realize multiple coating of the fertilizer; S6, after the multiple coating of the fertilizer, the cooling section (23) is entered, the cold air blower (232) is started, the cold air blower (232) blows cold air into the inside of the through hole of the sieve plate (231), and then cools and cools the fertilizer, so that the fertilizer is completely cured, and at the same time, the cooling section (23) rotates to screen out the unqualified fragments through the through hole of the sieve plate (231), so as to ensure the uniformity of the fertilizer.

7. The process for encapsulation using a dynamic variable segmenting drum based encapsulation apparatus as claimed in claim 6 wherein: In step S1, in the process of rotating the rotary drum (2), the second turning plate (51) rotates synchronously, when the second turning plate (51) contacts with the guide arc plate (55) and slides along the inner side wall of the guide arc plate (55), the second turning plate (51) protrudes into the inside of the rotary drum (2), and then drives the fertilizer to move, and when the second turning plate (51) slides through the guide arc plate (55), the second turning plate (51) is retracted into the notch hole (56) under the action of the spring (54), and then the fertilizer slides down.

8. The process for encapsulation using a dynamic variable segmenting drum based encapsulation apparatus as claimed in claim 7, wherein: In step S1, the rotating speed of the curing section (222) should be greater than that of the spraying section (221).

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