Slow release fertilizer manufacturing equipment with multi-layer structure and manufacturing method thereof

Abstract

The invention belongs to the technical field of slow release fertilizers, and particularly relates to a slow release fertilizer manufacturing device with a multilayer structure and a manufacturing method thereof.The slow release fertilizer manufacturing device comprises a base, and a powder wrapping device, an infiltration mechanism and a coating device are arranged on the upper surface of the base. According to the slow-release fertilizer manufacturing equipment with the multi-layer structure and the manufacturing method of the slow-release fertilizer manufacturing equipment, by arranging the coating device, an infiltrated fertilizer core can be coated after being coated with powder again, and a powder coating disc, an inner containing disc and an outer containing disc can be driven to rotate through driving of a driving rod, so that the fertilizer core needing to be processed can be driven to roll; meanwhile, by means of descending of a driving rod, a conveying channel on the driving rod is made to be opposite to a feeding opening in a connecting sleeve, fertilizer cores wrapped with powder on the upper layer can be conveniently conveyed to a containing inner disc on the lower layer, conveying of the fertilizer cores is completed, meanwhile, the containing inner disc and a containing outer disc are staggered, and therefore the fertilizer cores can be evenly coated with the coating agent. And fertilizer cores on the containing inner disc can conveniently enter a drying place below the containing inner disc.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slow-release fertilizer, in particular to a slow-release fertilizer manufacturing equipment with a multi-layer structure and a manufacturing method thereof. BACKGROUND

[0002] Slow-release fertilizer is a special kind of fertilizer, which is mainly characterized by slow release of nutrients to provide a sustained and stable supply of nutrients for plants. Slow release refers to the fact that the release rate of nutrients is much smaller than the rate at which fast-dissolving fertilizers are converted into plant-available nutrients after being applied to the soil. This type of fertilizer usually uses physical, chemical or biological methods to wrap nutrients in specific materials or form slightly soluble compounds, thereby controlling the release rate and time of nutrients to meet the needs of crops at different growth stages. The core goal is to match the release pattern of nutrients with the absorption pattern of crops, thereby improving fertilizer utilization, reducing nutrient loss and environmental pollution.

[0003] The existing device adopts a traditional swing disc or drum granulator to form a multi-layer structure by rolling and adhering the fertilizer core and powder in the equipment. For example, the swing disc granulator relies on irregular rolling of the fertilizer core to pick up the powder, but the centrifugal force easily causes the particles to fly out or be uneven in size. Although the drum granulator can form layers, it lacks precise control mechanisms, and the particles are easily adhered or broken. The size difference of the particles directly leads to a mismatch between the fertilizer core and the coating layer, resulting in large fluctuations in the release rate of nutrients and affecting the stage-by-stage absorption of crops. The multi-layer structure needs to be completed by multiple independent devices in series, such as centrifugal dewatering, uniform mixing, three-stage swing disc granulation and drum granulation. The transfer between each process relies on a belt conveyor, increasing the labor and equipment investment. The traditional single-layer granulation equipment needs to be operated 3-5 times to complete the multi-layer structure, which takes more than twice the time of a continuous production line. SUMMARY

[0004] Based on the core defects of the existing multi-layer slow-release fertilizer device, the process is dispersed and the control precision is insufficient. The poor particle uniformity is due to the mechanical operation of the granulation and coating links. The present application proposes a slow-release fertilizer manufacturing equipment with a multi-layer structure and a manufacturing method thereof.

[0005] The slow-release fertilizer manufacturing equipment with a multi-layer structure proposed by the present application comprises a base, and a powder wrapping device, an infiltration mechanism and a coating device are arranged on the upper surface of the base. The powder wrapping device comprises a powder wrapping mechanism and a conveying mechanism. The powder wrapping mechanism comprises a powder wrapping disc, and the deflection of the powder wrapping disc shakes the fertilizer core placed therein. The conveying mechanism comprises a conveying nozzle, which performs a powder spraying action on the fertilizer core in the powder wrapping disc. The infiltration mechanism is located on one side of the powder wrapping device and infiltrates the fertilizer core after the powder spraying is completed. The infiltration mechanism comprises an inclined hopper, which conveys the fertilizer core with a first layer structure after infiltration. The coating device is located on one side of the infiltrating mechanism, and the fertilizer core transported by the infiltrating mechanism is coated after being coated with powder, the coating device comprises a forming mechanism and a driving mechanism, the forming mechanism comprises a containing inner disc and a coating spray pipe, the coating spray pipe sprays coating agent on the fertilizer core in the containing inner disc, and the driving mechanism comprises a rotating pipe with a discharge port, and the rotation of the rotating pipe drives the containing inner disc to rotate.

[0006] Preferably, the powder coating mechanism further comprises an inclined hydraulic cylinder, one end of the inclined hydraulic cylinder is hinged to the upper surface of the base through a pin shaft, and the piston rod of the inclined hydraulic cylinder is hinged to the lower surface of the powder coating disc through a pin shaft, and the lower surface of the powder coating disc is rotatably connected to the upper surface of the base through a bearing seat.

[0007] Preferably, the upper surface of the powder coating disc is fixedly provided with an air inlet hopper, the inner wall of the air inlet hopper is fixedly provided with a flow uniforming plate, the outer surface of the powder coating disc is fixedly provided with a discharge slot, the inner wall of the discharge slot is slidably connected with a discharge door provided with a breathable film, the outer surface of the powder coating disc is fixedly provided with a discharge hydraulic cylinder, one end of the discharge door penetrates through the upper surface of the discharge slot and is fixedly connected with the piston rod of the discharge hydraulic cylinder, one side of the powder coating disc is fixedly connected with a feeding bin provided with a control valve, and the outer surface of the feeding bin is fixedly connected with the upper surface of the base through a support.

[0008] Preferably, the conveying mechanism comprises a conveying cylinder fixedly installed on the upper surface of the base, the inner wall of the conveying cylinder is rotatably connected with a stirring bucket provided with a gear, both ends of the stirring bucket are rotatably connected with the outer surface of the conveying cylinder through bearings, the upper surface of the base is fixedly provided with a rotating motor, the inner wall of the conveying cylinder is rotatably connected with an air outlet stirring pipe provided with a breathable film, the output shaft of the rotating motor is engaged with the gear of the stirring bucket through a gear, thereby driving the stirring bucket to rotate, and the output shaft of the rotating motor drives the air outlet stirring pipe to rotate through a gear set.

[0009] Preferably, the upper surface of the base is fixedly provided with a conveying fan, the air outlet end of the conveying fan is rotatably connected with one end of the air outlet stirring pipe through a rotary joint, the air inlet pipes of the two conveying fans are communicated with a pipeline conveying filtered air through a connecting pipe, one end of the air inlet hopper is fixedly communicated with one end of the air outlet pipe of the two conveying fans through a hose, the outer surface of the powder coating disc is hinged to the outer surface of the conveying nozzle through a pin shaft, one end of the conveying nozzle is fixedly communicated with the outer surface of the conveying cylinder through a hose, the outer surface of the conveying nozzle is fixedly provided with a sealing film, and the sealing film is fixedly installed on the inner wall of the powder coating disc.

[0010] Preferably, the lower surface of the coating tray is rotatably connected to a long shaft with a bevel gear via a bearing, and a rocking motor with a bevel gear is fixedly mounted on the lower surface of the coating tray. The bevel gear of the rocking motor meshes with the bevel gear of the long shaft. The two long shafts are connected by a synchronous belt and a synchronous pulley. A rotating disk with a bevel gear is rotatably connected to the lower surface of the coating tray. The bevel gear of the rotating disk meshes with the bevel gear of the long shaft. A crank handle is fixedly mounted on the outer surface of the rotating disk. A connecting frame is fixedly mounted on one end of the conveying nozzle, and the inner wall of the crank handle is slidably sleeved with the outer surface of the connecting frame.

[0011] Preferably, the impregnation mechanism further includes a partition plate, which is fixedly installed on the inner wall of the inclined bucket. The inclined bucket is fixedly installed on the upper surface of the base. A steam pipe for conveying steam is fixedly installed on the inner wall of the inclined bucket. One end of the steam pipe passes through one end of the inclined bucket and is fixedly connected to the outlet end of the steam generator. A screw conveyor is fixedly installed on the upper surface of the base, and one end of the inclined bucket is fixedly connected to the feed end of the screw conveyor.

[0012] Preferably, the forming mechanism further includes an outer cylinder with a discharge chamber door, the outer cylinder being fixedly installed on the upper surface of the base, a heating component being fixedly installed on the outer surface of the outer cylinder, the upper surface of the outer cylinder being fixedly connected to the discharge end of the screw conveyor, a powder coating disc being rotatably connected to the inner wall of the outer cylinder, a connecting elastic membrane being fixedly connected to the inner wall of the powder coating disc, a powder spraying pipe being fixedly installed on the inner wall of the outer cylinder above the powder coating disc, one end of the powder spraying pipe located outside the outer cylinder being fixedly connected to the conveying component for conveying fertilizer powder, an outer holding plate being rotatably connected to the inner wall of the outer cylinder, an inner holding plate being rotatably connected to the inner wall of the outer holding plate, the inner wall of the outer cylinder being fixedly installed to the outer surface of the coating spray pipe, and one end of the coating spray pipe located outside the outer cylinder being fixedly connected to the component for conveying coating agent.

[0013] Preferably, the driving mechanism includes a hydraulic cylinder, which is fixedly mounted on the upper surface of the base. One end of the piston rod of the hydraulic cylinder is rotatably connected to a drive rod with a long gear via a bearing. A drive motor is fixedly mounted on the upper surface of the base. One end of the output shaft of the drive motor meshes with the long gear of the drive rod via a gear. One end of the rotating tube is rotatably connected to the inner bottom wall of the outer cylinder. A scraper is fixedly mounted on the lower end of the rotating tube, and the lower surface of the scraper is slidably connected to the inner bottom wall of the outer cylinder. The outer surface of the drive rod is slidably inserted into the inner wall of the rotating tube. The inner wall of the inner tray is rotatably connected to the outer surface of the rotating tube. An electromagnet assembly is fixedly mounted on the outer surface of the rotating tube. The two electromagnets of the electromagnet assembly are magnetically connected to the inner walls of the inner and outer containers, respectively. A connecting sleeve with a feed inlet is slidably inserted into the upper end of the rotating tube. A connecting spring is fixedly installed on the outer surface of the connecting sleeve, and one end of the connecting spring is fixedly installed to the outer surface of the rotating tube. The inner wall of the connecting sleeve is slidably inserted into one end of the drive rod. A conveying channel is opened on the inner wall of the drive rod. The outer surface of the connecting elastic membrane is rotatably connected to the outer surface of the connecting sleeve. A descending ring is fixedly installed on the inner wall of the connecting sleeve. After the drive rod descends, it contacts the upper surface of the descending ring, causing the connecting sleeve to descend. The outer surface of the connecting sleeve is slidably inserted into the inner wall of the coating disc.

[0014] The present invention discloses a method for manufacturing a multi-layered slow-release fertilizer manufacturing device, comprising the following steps: S1: Pour the prepared fertilizer core into the feeding hopper. The feeding hopper conveys a fixed amount of fertilizer core into the powder coating tray. The tilting hydraulic cylinder pushes the powder coating tray to deflect left and right. At the same time, the rotary motor and conveying fan on the base are started. The start of the rotary motor drives the mixing bucket and the air-discharging mixing pipe in the conveying cylinder to rotate in opposite directions through the transmission of the gear set. The mixing bucket and the air-discharging mixing pipe stir the fertilizer powder in the conveying cylinder respectively. At the same time, the conveying fan delivers the drawn gas into the air-discharging mixing pipe. After passing through the air-permeable membrane of the air-discharging mixing pipe, the powder inside is blown, so that the powder enters the conveying nozzle through the hose on the outer cylinder. At the same time, the blowing of the powder by the air-discharging mixing pipe increases the stirring efficiency. S2: After the swing motor on the lower surface of the powder coating tray is started, the swing motor can drive the long shaft to rotate through the transmission of bevel gears. One long shaft drives the other long shaft to rotate through the cooperation of the synchronous belt and synchronous pulley. After the two long shafts drive the rotating disk to rotate through the transmission of bevel gears, the rotating disk drives the rocker handle to rotate and pull the connecting frame to swing. The connecting frame drives the hinged conveying nozzle to swing left and right, increasing the powder spraying range, so that the sprayed powder can be evenly attached to the outer surface of the rolling fertilizer core. At the same time, a small part of the gas drawn by the conveying fan can enter the air inlet hopper through the hose and be diverted by the flow equalization plate to be conveyed from top to bottom, so as to lower the conveyed powder and prevent the powder from rising. The pressed powder can be evenly attached to the fertilizer core. The gas in the powder coating tray flows out through the vent membrane of the discharge door, and the powder can be blocked. S3: After the first coating is completed, the coating disc tilts towards the inclined hopper, so that one end of the discharge chute contacts the upper surface of the inclined hopper. The discharge gate rises under the control of the discharge hydraulic cylinder. The fertilizer core that has completed the first coating enters the inclined hopper through the inclined coating disc, and is diverted and rolled by the partition. Steam generated by Zeng Qi generator is transported through the steam pipe to wet the rolling fertilizer core with the first coating structure. After being wetted, the fertilizer core enters the outer cylinder through the screw conveyor. S3: The screw conveyor transports the impregnated fertilizer cores above the connecting elastic membrane. Simultaneously, the powder spraying pipe sprays powder onto the connecting elastic membrane. The drive motor starts, causing the drive rod to rotate. The rotation of the drive rod causes the connecting sleeve, which is slidably inserted with it, to rotate. The connecting sleeve then causes the powder coating disc, which is slidably inserted with it, to rotate. The powder coating disc then causes the connecting elastic membrane, which is fixedly installed with it, to rotate, thus dispersing the gathered fertilizer cores and achieving a uniform powder coating effect. After completing the second layer of powder coating, the hydraulic cylinder pushes the drive rod to descend, causing the drive rod to... The conveying channel and the discharge port on the connecting sleeve are opposite each other, and at the same time, the outer surface of the drive rod contacts the descending ring. The descent of the drive rod can drive the connecting sleeve to descend, the connecting spring is compressed, and the connecting sleeve descends in the rotating tube, pulling the connecting elastic membrane from a plane to a cone surface. This causes the dispersed fertilizer cores to gather and enter the feed port of the connecting sleeve, and then disperse onto the inner tray through the conveying channel and the discharge port of the rotating tube. The rotation of the drive rod can ensure that all the fertilizer cores enter the inner tray through the conveying channel and the discharge port. After that, the drive rod resets, causing the connecting elastic membrane to reset. S4: The rotation of the rotating tube, driven by the energization of the electromagnet assembly, causes the inner and outer holding plates to rotate. Simultaneously, the coating spray nozzle sprays coating agent, ensuring that the fertilizer core with the second layer structure is evenly coated with the coating agent. After the electromagnet at the bottom of the electromagnet assembly is de-energized, the magnetic connection with the outer holding plate is released, and the inner holding plate rotates while the outer holding plate cannot rotate. Once the through holes on the inner holding plate align with the through holes on the outer holding plate, the de-energized electromagnet of the electromagnet assembly is energized, causing the outer and inner holding plates to continue rotating. The coated fertilizer core can fall through the aligned through holes on the outer and inner holding plates into the inner bottom wall of the outer cylinder. The heating component heats the outer cylinder, and the rotation of the rotating tube drives the scraper to dry the coated fertilizer core. The dried fertilizer is then conveyed out through the discharge hopper door.

[0015] The beneficial effects of this invention are as follows: 1. By setting up a powder coating device, the production of slow-release fertilizer can be made more uniform. The oscillation of the conveying nozzle can evenly distribute the sprayed fertilizer powder, making the fertilizer effect of the produced slow-release fertilizer more uniform. The push of the tilting hydraulic cylinder can make the powder coating disc deflect left and right, thereby driving the internal fertilizer core to roll left and right, evenly coating it with the sprayed fertilizer powder. At the same time, the cooperation of the stirring bucket and the air outlet stirring pipe can stir the fertilizer powder in the conveying cylinder. The air outlet stirring pipe can simultaneously convey the air flow from the conveying fan, blowing the powder in the conveying cylinder. The air flow carries the powder through the conveying nozzle, thus keeping the fertilizer core powder coated evenly. This solves the core defects of existing multi-layer slow-release fertilizer devices, which are insufficient process dispersion and control precision, poor particle uniformity due to mechanical operation in the granulation and coating process, and low production efficiency.

[0016] 2. By setting up a coating device, the soaked fertilizer cores can be coated again with powder. Driven by the drive rod, the powder coating disc, the inner tray, and the outer tray rotate, which in turn causes the fertilizer cores to be processed to roll, thus completing the powder coating and uniform spraying of the coating agent. At the same time, by lowering the drive rod, the conveying channel on the drive rod is aligned with the feed port on the connecting sleeve, which facilitates the conveying of the upper powder-coated fertilizer cores into the lower inner tray. The misalignment of the inner and outer trays facilitates the flow of the fertilizer cores on the inner tray into the drying area below, thereby drying the coated fertilizer cores and completing the production of slow-release fertilizer. This solves the core defects of existing multi-layer slow-release fertilizer devices, which are insufficient process dispersion and control precision, poor particle uniformity due to mechanical operation in the granulation and coating stages, and low production efficiency. Attached Figure Description

[0017] Figure 1This is a schematic diagram of a multi-layered slow-release fertilizer manufacturing device proposed in this invention; Figure 2 This is a perspective view of the flow equalization plate structure of a multi-layer slow-release fertilizer manufacturing device proposed in this invention. Figure 3 This is a perspective view of the tilting hydraulic cylinder structure of a multi-layered slow-release fertilizer manufacturing equipment proposed in this invention. Figure 4 This is a perspective view of the conveying nozzle structure of a multi-layered slow-release fertilizer manufacturing device proposed in this invention. Figure 5 This is a perspective view of the stirring bucket structure of a multi-layered slow-release fertilizer manufacturing device proposed in this invention; Figure 6 This is a perspective view of the rotary motor structure of a multi-layered slow-release fertilizer manufacturing device proposed in this invention. Figure 7 This is a perspective view of the steam pipe structure of a multi-layered slow-release fertilizer manufacturing device proposed in this invention. Figure 8 This is a perspective view of the screw conveyor structure of a multi-layer slow-release fertilizer manufacturing equipment proposed in this invention; Figure 9 This is a perspective view of the outer tray structure of a multi-layered slow-release fertilizer manufacturing device proposed in this invention. Figure 10 This is a perspective view of the connecting sleeve structure of a multi-layered slow-release fertilizer manufacturing equipment proposed in this invention. Figure 11 This is a perspective view of the connecting spring structure of a multi-layered slow-release fertilizer manufacturing device proposed in this invention. Figure 12 This is a perspective view of the scraper structure of a multi-layered slow-release fertilizer manufacturing device proposed in this invention. Figure 13 This is a perspective view of the electromagnet assembly structure of a multi-layered slow-release fertilizer manufacturing device proposed in this invention.

[0018] In the diagram: 1. Base; 2. Inclined hydraulic cylinder; 21. Coating tray; 22. Air inlet hopper; 23. Flow equalization plate; 24. Discharge chute; 25. Discharge gate; 26. Discharge hydraulic cylinder; 27. Feed hopper; 3. Conveying cylinder; 31. Mixing hopper; 32. Rotary motor; 33. Air outlet mixing pipe; 34. Conveying fan; 35. Conveying nozzle; 36. Sealing membrane; 4. Long shaft; 41. Swing motor; 42. Rotary disc; 43. Handle; 44. Connecting frame; 5. Inclined hopper; 51. Baffle; 52. Steam pipe; 53. Screw conveyor; 6. Outer cylinder; 61. Heating component; 62. Coating disc; 63. Connecting elastic membrane; 64. Powder spraying pipe; 65. Outer tray; 66. Inner tray; 67. Coating spray nozzle; 7. Pushing hydraulic cylinder; 71. Drive rod; 72. Drive motor; 73. Rotating tube; 74. Scraper; 75. Electromagnet assembly; 8. Connecting sleeve; 81. Connecting spring; 82. Conveying channel; 83. Lowering ring. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Reference Figures 1-13 A multi-layered slow-release fertilizer manufacturing device includes a base 1, and the upper surface of the base 1 is provided with a powder coating device, an impregnation mechanism, and a coating device.

[0021] like Figures 2-6 As shown, in order to ensure that the fertilizer core is evenly coated with powder, the powder coating device includes a powder coating mechanism and a conveying mechanism. The powder coating mechanism includes a powder coating tray 21, and the deflection of the powder coating tray 21 shakes the fertilizer core it holds. The conveying mechanism includes a conveying nozzle 35, which sprays powder onto the fertilizer core in the powder coating tray 21.

[0022] Specifically, in order for the coating tray 21 to deflect left and right, causing the internal fertilizer core to sway back and forth, the coating mechanism also includes a tilting hydraulic cylinder 2. One end of the tilting hydraulic cylinder 2 is hinged to the upper surface of the base 1 via a pin, and one end of the piston rod of the tilting hydraulic cylinder 2 is hinged to the lower surface of the coating tray 21 via a pin. The lower surface of the coating tray 21 is rotatably connected to the upper surface of the base 1 via a bearing seat. The two hinged tilting hydraulic cylinders 2 rise and fall to pull the coating tray 21, causing the coating tray 21 to deflect left and right.

[0023] Specifically, to prevent the conveyed powder from floating and causing uneven coating, an air inlet hopper 22 is fixedly installed on the upper surface of the coating tray 21. A flow equalization plate 23 is fixedly installed on the inner wall of the air inlet hopper 22. The flow equalization plate 23 conveys and distributes the powder into the coating tray 21, forming a top-to-bottom air curtain. This air curtain controls the conveyed powder, preventing it from floating and keeping it below the coating tray 21 at a height higher than the diameter of the slow-release fertilizer core, facilitating uniform coating. To facilitate fertilizer core discharge from the coating tray 21, a discharge chute 24 is fixedly installed on the outer surface of the coating tray 21. A sliding coupling is inserted into the inner wall of the discharge chute 24. The discharge gate 25 has a breathable membrane, which facilitates the airflow out of the coating tray 21 and prevents excessive internal air pressure. A discharge hydraulic cylinder 26 is fixedly installed on the outer surface of the coating tray 21. One end of the discharge gate 25 passes through the upper surface of the discharge trough 24 and is fixedly installed with one end of the piston rod of the discharge hydraulic cylinder 26. Pulling the discharge hydraulic cylinder 26 can open the discharge gate 25. A feeding hopper 27 with a control valve is fixedly connected to one side of the coating tray 21. The outer surface of the feeding hopper 27 is fixedly installed with the upper surface of the base 1 through a bracket. The feeding hopper 27 can quantitatively discharge materials.

[0024] Specifically, for conveying fertilizer powder, the conveying mechanism includes a conveying cylinder 3, which holds chemical fertilizer powder or organic fertilizer powder. The conveying cylinder 3 is fixedly installed on the upper surface of the base 1. A geared stirring bucket 31 is rotatably connected to the inner wall of the conveying cylinder 3. The stirring bucket 31 consists of a connecting member and an inclined scraper 74 mounted on the connecting member. The scraper 74 contacts the inner wall of the conveying cylinder 3. The movement of the scraper 74 causes the powder to be scraped up and then fall back down after rotation, effectively preventing powder agglomeration. Both ends of the stirring bucket 31 are rotatably connected to the outer surface of the conveying cylinder 3 via bearings. The base 1... A rotary motor 32 is fixedly installed on the upper surface. An air outlet stirring pipe 33 with a breathable membrane is rotatably connected to the inner wall of the conveying cylinder 3. The output shaft of the rotary motor 32 drives the stirring bucket 31 to rotate after meshing with the gear of the stirring bucket 31 through the gear. The output shaft of the rotary motor 32 drives the air outlet stirring pipe 33 to rotate through the gear set. The air outlet stirring pipe 33 and the stirring bucket 31 rotate in opposite directions, which can increase the stirring efficiency. The air outlet stirring pipe 33 is composed of a main pipe body and a branch pipe body fixedly connected to the main pipe body. The breathable membrane is fixedly installed at one end of the branch pipe body to prevent powder from entering the branch pipe body, while not affecting the output of the airflow.

[0025] Specifically, to facilitate powder conveying, a conveying fan 34 is fixedly installed on the upper surface of the base 1. The outlet end of the conveying fan 34 is rotatably connected to one end of the air outlet mixing pipe 33 via a rotary joint, so that the rotation of the air outlet mixing pipe 33 does not affect the airflow. The air inlet pipes of the two conveying fans 34 are connected to the pipeline for conveying filtered air via connecting pipes. The conveying fans 34 draw in purified air to prevent it from affecting the fertilizer powder. One end of the air inlet hopper 22 is fixedly connected to one end of the air outlet pipe of the two conveying fans 34 via a flexible hose. The air inlet hopper 22 is connected to a control valve at one end, which can control the air pressure of the air inlet, thus facilitating precise adjustment. The outer surface of the powder coating tray 21 is hinged to the outer surface of the conveying nozzle 35 through a pin. One end of the conveying nozzle 35 is fixedly connected to the outer surface of the conveying cylinder 3 through a hose. A sealing membrane 36 is fixedly installed on the outer surface of the conveying nozzle 35. The sealing membrane 36 is fixedly installed on the inner wall of the powder coating tray 21. The sealing membrane 36 seals the space between the conveying nozzle 35 and the powder coating tray 21, while not affecting the left and right swing of the conveying nozzle 35.

[0026] Specifically, in order to drive the conveying nozzle 35 to automatically swing left and right, the lower surface of the powder coating tray 21 is rotatably connected to a long shaft 4 with a bevel gear via a bearing. A swing motor 41 with a bevel gear is fixedly installed on the lower surface of the powder coating tray 21. The bevel gear of the swing motor 41 meshes with the bevel gear of the long shaft 4. The two long shafts 4 are connected by a synchronous belt and a synchronous pulley. A rotating disk 42 with a bevel gear is rotatably connected to the lower surface of the powder coating tray 21. The bevel gear of the rotating disk 42 meshes with the bevel gear of the long shaft 4. A crank handle 43 is fixedly installed on the outer surface of the rotating disk 42. A connecting frame 44 is fixedly installed at one end of the conveying nozzle 35. The inner wall of the crank handle 43 is slidably sleeved with the outer surface of the connecting frame 44.

[0027] like Figures 7-8 As shown, in order to impregnate the fertilizer core after coating with powder, enhance the interlayer bonding force and achieve the functions of sterilization and insect prevention, the impregnation mechanism is located on one side of the powder coating device and impregnates the fertilizer core after powdering. The impregnation mechanism includes an inclined bucket 5, which conveys the impregnated fertilizer core with the first layer structure.

[0028] Specifically, in order to divert the conveyed fertilizer cores, the impregnation mechanism also includes a baffle 51, which is fixedly installed on the inner wall of the inclined bucket 5. The inclined bucket 5 is fixedly installed on the upper surface of the base 1. In order to convey steam, a steam pipe 52 for conveying steam is fixedly installed on the inner wall of the inclined bucket 5. One end of the steam pipe 52 passes through one end of the inclined bucket 5 and is fixedly connected to the outlet end of the steam generator. In order to convey the impregnated fertilizer cores from the lower position to the higher position, a screw conveyor 53 is fixedly installed on the upper surface of the base 1. One end of the inclined bucket 5 is fixedly connected to the feed end of the screw conveyor 53.

[0029] like Figures 9-13As shown, in order to process the impregnated fertilizer cores, a coating device is located on one side of the impregnation mechanism and coats the fertilizer cores conveyed by the impregnation mechanism with powder. The coating device includes a forming mechanism and a driving mechanism. The forming mechanism includes an inner tray 66 and a coating spray pipe 67. The coating spray pipe 67 sprays coating agent onto the fertilizer cores in the inner tray 66. The driving mechanism includes a rotating pipe 73 with a discharge port. The rotation of the rotating pipe 73 drives the inner tray 66 to rotate.

[0030] Specifically, to complete the production of slow-release fertilizer, the molding mechanism also includes an outer cylinder 6 with a discharge chamber door. The discharge chamber door is located at the bottom of the outer cylinder 6 and can be opened by a hydraulic cylinder. The outer cylinder 6 is fixedly installed on the upper surface of the base 1. A heating component 61, which can be a heating block, is fixedly installed on the outer surface of the outer cylinder 6. The upper surface of the outer cylinder 6 is fixedly connected to the discharge end of the screw conveyor 53. A powder coating disc 62 is rotatably connected to the inner wall of the outer cylinder 6. A connecting elastic membrane 63 is fixedly connected to the inner wall of the powder coating disc 62. A powder spraying pipe 64 is fixedly installed on the inner wall of the outer cylinder 6 above the powder coating disc 62. One end of the powder spraying pipe 64 located outside the outer cylinder 6 is fixedly connected to a conveying component for conveying fertilizer powder, conveying functional powders (such as trace element powder) and mineral fillers. The conveying component can be the same device as the conveying mechanism. It may consist of a mixing drum containing powder and a blower. The inner wall of the outer cylinder 6 is rotatably connected to an outer plate 65, and an inner plate 66 is rotatably connected to the inner wall of the outer plate 65. Both the outer plate 65 and the inner plate 66 have through holes of the same size. When the through holes are aligned, the coated fertilizer core can fall to the lower layer. When the through holes are misaligned, the fertilizer core at the top cannot fall, thus performing the coating work. The thickness of the inner plate 66 is between 0.5mm and 1mm to prevent it from affecting the fertilizer core that needs to be coated. The inner wall of the outer cylinder 6 is fixedly installed on the outer surface of the coating nozzle 67. One end of the coating nozzle 67 located outside the outer cylinder 6 is fixedly connected to the coating agent conveying component. The coating agent conveying component consists of a mixing tank containing the coating agent and a water pump. The coating agent in the mixing tank can be conveyed into the coating nozzle 67 by the suction of the water pump.

[0031] Specifically, to drive the powder spraying disc, the outer container 65, and the inner container 66 to rotate, the driving mechanism includes a hydraulic cylinder 7, which is fixedly mounted on the upper surface of the base 1. One end of the piston rod of the hydraulic cylinder 7 is rotatably connected to a drive rod 71 with a long gear via a bearing. A drive motor 72 is fixedly mounted on the upper surface of the base 1. One end of the output shaft of the drive motor 72 meshes with the long gear of the drive rod 71 via a gear. One end of the rotating tube 73 is rotatably connected to the inner bottom wall of the outer cylinder 6. To accelerate the drying speed, a scraper 74 is fixedly mounted on the lower end of the rotating tube 73. The lower surface of the scraper 74 is slidably connected to the inner bottom wall of the outer cylinder 6. The outer surface of the drive rod 71 is slidably inserted into the inner wall of the rotating tube 73. The rotation of the drive rod 71 can drive the rotation of the rotating tube 73. The inner wall of the inner container 66 is rotatably connected to the outer surface of the rotating tube 73. To selectively drive the inner container 66 and the outer container 65, an electromagnet assembly 75 is fixedly mounted on the outer surface of the rotating tube 73. Two electromagnets in the electromagnet assembly 75 are magnetically connected to the inner walls of the inner and outer trays 66 and 65, respectively. To drive the rotation of the powder-spraying disc, a connecting sleeve 8 with a feed inlet is slidably inserted into the upper end of the rotating tube 73. A connecting spring 81 is fixedly installed on the outer surface of the connecting sleeve 8, with one end of the connecting spring 81 fixedly installed to the outer surface of the rotating tube 73. The inner wall of the connecting sleeve 8 is slidably inserted into one end of the drive rod 71. To transport the powdered fertilizer core to the inner tray 66, the drive rod... The inner wall of 71 is provided with a conveying channel 82. The outer surface of the connecting elastic membrane 63 is rotatably connected to the outer surface of the connecting sleeve 8. The descent of the connecting sleeve 8 can pull the connecting elastic membrane 63 from a plane to a cone shape, which facilitates the accumulation of fertilizer cores and thus completes the conveying of fertilizer cores. A descending ring 83 is fixedly installed on the inner wall of the connecting sleeve 8. After the drive rod 71 descends, it contacts the upper surface of the descending ring 83 and drives the connecting sleeve 8 to descend. The outer surface of the connecting sleeve 8 is slidably inserted into the inner wall of the powder coating disc 62.

[0032] The present invention discloses a method for manufacturing a multi-layered slow-release fertilizer manufacturing device, comprising the following steps: S1: The prepared fertilizer core is poured into the feeding hopper 27. A certain amount of fertilizer core is conveyed into the powder coating tray 21 through the feeding hopper 27. The tilting hydraulic cylinder 2 pushes the powder coating tray 21 to deflect left and right. At the same time, the rotary motor 32 and the conveying fan 34 on the base 1 are started. The start of the rotary motor 32 drives the mixing bucket 31 and the air outlet mixing pipe 33 in the conveying cylinder 3 to rotate in opposite directions through the transmission of the gear set. The mixing bucket 31 and the air outlet mixing pipe 33 respectively stir the fertilizer powder in the conveying cylinder 3. At the same time, the conveying fan 34 conveys the drawn gas into the air outlet mixing pipe 33. After passing through the air-permeable membrane of the air outlet mixing pipe 33, the powder inside is blown, so that the powder enters the conveying nozzle 35 through the hose on the outer cylinder 6. At the same time, the blowing of the powder by the air outlet mixing pipe 33 increases the mixing efficiency. S2: After the swing motor 41 on the lower surface of the powder coating tray 21 is started, the swing motor 41 can drive the long shaft 4 to rotate through the transmission of bevel gears. One long shaft 4 drives the other long shaft 4 to rotate through the cooperation of the synchronous belt and synchronous pulley. After the two long shafts 4 drive the rotating disk 42 to rotate through the transmission of bevel gears, the rotating disk 42 drives the rocker arm 43 to rotate and pull the connecting frame 44 to swing. The connecting frame 44 drives the hinged conveying nozzle 35 to swing left and right, increasing the powder spraying range, so that the sprayed powder can be evenly attached to the outer surface of the rolling fertilizer core. At the same time, a small part of the gas drawn by the conveying fan 34 can enter the air inlet hopper 22 through the hose and be diverted by the flow equalization plate 23 to be conveyed from top to bottom, so as to lower the conveyed powder and prevent the powder from rising. The pressed powder can be evenly attached to the fertilizer core. The gas in the powder coating tray 21 flows out through the vent membrane of the discharge door 25, and the powder can be blocked. S3: After the first coating is completed, the coating disc 21 tilts towards the inclined hopper 5, so that one end of the discharge chute 24 contacts the upper surface of the inclined hopper 5. The discharge gate 25 rises under the control of the discharge hydraulic cylinder 26. The fertilizer core that has completed the first coating enters the inclined hopper 5 through the inclined coating disc 21, is diverted and rolled by the partition 51, and the steam generated by the Zengqi generator is transported through the steam pipe 52 to wet the rolling fertilizer core with the first coating structure. After being wetted, the fertilizer core enters the outer cylinder 6 through the screw conveyor 53. S3: The screw conveyor 53 transports the impregnated fertilizer cores above the connecting elastic membrane 63. Simultaneously, the powder spraying pipe 64 sprays powder onto the connecting elastic membrane 63. The drive motor 72 starts, driving the drive rod 71 to rotate. The rotation of the drive rod 71 causes the connecting sleeve 8, which is slidably inserted with it, to rotate. The connecting sleeve 8 then drives the powder coating disc 62, which is slidably inserted with it, to rotate. The powder coating disc 62 then drives the connecting elastic membrane 63, which is fixedly installed with it, to rotate, thus dispersing the aggregated fertilizer cores and achieving a uniform powder coating effect. After completing the second layer of powder coating, the hydraulic cylinder 7 pushes the drive rod 71 to descend, causing the conveyor on the drive rod 71 to... The outlets on the channel 82 and the connecting sleeve 8 are opposite each other, and the outer surface of the drive rod 71 contacts the descending ring 83. The descent of the drive rod 71 can drive the connecting sleeve 8 to descend, the connecting spring 81 is compressed, and the connecting sleeve 8 descends in the rotating tube 73, pulling the connecting elastic membrane 63 from a plane to a cone surface, so that the dispersed fertilizer cores gather and enter the feed port of the connecting sleeve 8 and are scattered on the inner tray 66 through the conveying channel 82 and the outlet of the rotating tube 73. The rotation of the drive rod 71 can make the fertilizer cores enter the inner tray 66 through the conveying channel 82 and the outlet. Then the drive rod 71 resets, so that the connecting elastic membrane 63 resets. S4: The rotation of the rotating tube 73, after being energized by the electromagnet assembly 75, drives the inner and outer holding plates 66 and 65 to rotate. At the same time, the coating spray pipe 67 sprays the coating agent, so that the fertilizer core with the second layer structure is evenly coated with the coating agent. After the electromagnet at the bottom of the electromagnet assembly 75 is de-energized, the magnetic connection with the outer holding plate 65 is released, the inner holding plate 66 rotates, and the outer holding plate 65 cannot rotate. After the through holes on the inner holding plate 66 and the through holes on the outer holding plate 65 are aligned, the electromagnet of the de-energized electromagnet assembly 75 is energized, driving the outer and inner holding plates 65 to continue rotating. The coated fertilizer core can fall into the inner bottom wall of the outer cylinder 6 through the aligned through holes on the outer and inner holding plates 65 and 66. The heating component 61 heats the outer cylinder 6. The rotation of the rotating tube 73 drives the scraper 74 to dry the coated fertilizer core. The dried fertilizer is conveyed out through the discharge hopper door.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-layered slow-release fertilizer manufacturing apparatus comprising a base (1), characterized in that: The upper surface of the base (1) is provided with a powder wrapping device, an infiltration mechanism and a coating device; The powder wrapping device comprises a powder wrapping mechanism and a conveying mechanism, the powder wrapping mechanism comprises a powder wrapping disc (21), the deflection of the powder wrapping disc (21) shakes the held core, and the conveying mechanism comprises a conveying nozzle (35), the conveying nozzle (35) performs powder spraying on the core in the powder wrapping disc (21); The infiltration mechanism is located on one side of the powder wrapping device and infiltrates the core after powder spraying, the infiltration mechanism comprises an inclined hopper (5), the inclined hopper (5) conveys the core after infiltration and with a first layer structure; The coating device is located on one side of the infiltration mechanism and coats the core after powder wrapping conveyed by the infiltration mechanism, the coating device comprises a forming mechanism and a driving mechanism, the forming mechanism comprises a holding inner disc (66) and a coating spray pipe (67), the coating spray pipe (67) sprays coating agent on the core in the holding inner disc (66), and the driving mechanism comprises a rotating pipe (73) with a discharge port, the rotation of the rotating pipe (73) drives the holding inner disc (66) to rotate.

2. The apparatus for manufacturing a slow-release fertilizer of a multi-layer structure according to claim 1, wherein: The powder wrapping mechanism further comprises an inclined hydraulic cylinder (2), one end of the inclined hydraulic cylinder (2) is hinged to the upper surface of the base (1) through a pin shaft, the piston rod of the inclined hydraulic cylinder (2) is hinged to the lower surface of the powder wrapping disc (21) through a pin shaft, and the lower surface of the powder wrapping disc (21) is rotationally connected to the upper surface of the base (1) through a bearing seat.

3. The apparatus for manufacturing a slow-release fertilizer of a multi-layer structure according to claim 2, characterized in that: An air inlet hopper (22) is fixedly installed on the upper surface of the powder wrapping disc (21), a flow uniforming plate (23) is fixedly installed on the inner wall of the air inlet hopper (22), a discharge chute (24) is fixedly installed on the outer surface of the powder wrapping disc (21), a discharge door (25) with a breathable film is slidingly inserted into the inner wall of the discharge chute (24), a discharge hydraulic cylinder (26) is fixedly installed on the outer surface of the powder wrapping disc (21), one end of the discharge door (25) penetrates through the upper surface of the discharge chute (24) and is fixedly installed on the piston rod of the discharge hydraulic cylinder (26), a feeding bin (27) with a control valve is fixedly communicated on one side of the powder wrapping disc (21), and the outer surface of the feeding bin (27) is fixedly installed on the upper surface of the base (1) through a support.

4. The apparatus for manufacturing a slow-release fertilizer of a multi-layer structure according to claim 3, wherein: The conveying mechanism comprises a conveying cylinder (3), the conveying cylinder (3) is fixedly installed on the upper surface of the base (1), a stirring hopper (31) with a gear is rotationally connected to the inner wall of the conveying cylinder (3), both ends of the stirring hopper (31) are rotationally connected to the outer surface of the conveying cylinder (3) through bearings, a rotating motor (32) is fixedly installed on the upper surface of the base (1), an air outlet stirring pipe (33) with a breathable film is rotationally connected to the inner wall of the conveying cylinder (3), the output shaft of the rotating motor (32) is engaged with the gear of the stirring hopper (31) through a gear, so that the stirring hopper (31) is driven to rotate, and the output shaft of the rotating motor (32) drives the air outlet stirring pipe (33) to rotate through a gear set.

5. The apparatus for manufacturing a slow release fertilizer of a multi-layer structure according to claim 4, wherein: The upper surface of the base (1) is fixedly installed with a conveying fan (34), the air outlet end of the conveying fan (34) is rotatably connected with one end of the air outlet stirring pipe (33) through a rotary joint, the air inlet pipes of the two conveying fans (34) are communicated with the pipeline conveying filtered air through a connecting pipe, one end of the air inlet hopper (22) is fixedly communicated with one end of the air outlet pipe of the two conveying fans (34) through a hose, the outer surface of the powder wrapping disc (21) is hingedly connected with the outer surface of the conveying nozzle (35) through a pin shaft, one end of the conveying nozzle (35) is fixedly communicated with the outer surface of the conveying cylinder (3) through a hose, and the outer surface of the conveying nozzle (35) is fixedly installed with a sealing film (36), and the sealing film (36) is fixedly installed on the inner wall of the powder wrapping disc (21).

6. The apparatus for manufacturing a slow release fertilizer of a multi-layer structure according to claim 5, wherein: The lower surface of the powder wrapping disc (21) is rotatably connected with a long shaft (4) with bevel gears through a bearing, the lower surface of the powder wrapping disc (21) is fixedly installed with a swing motor (41) with bevel gears, the bevel gears of the swing motor (41) are engaged with the bevel gears of the long shaft (4), the two long shafts (4) are drivingly connected through synchronous belts and synchronous pulleys, the lower surface of the powder wrapping disc (21) is rotatably connected with a rotating disc (42) with bevel gears, the bevel gears of the rotating disc (42) are engaged with the bevel gears of the long shaft (4), the outer surface of the rotating disc (42) is fixedly installed with a rocking handle (43), one end of the conveying nozzle (35) is fixedly installed with a connecting frame (44), and the inner wall of the rocking handle (43) is slidably sleeved with the outer surface of the connecting frame (44).

7. The apparatus for manufacturing a slow-release fertilizer of a multi-layer structure according to claim 6, characterized by: The infiltration mechanism further comprises a partition plate (51) fixedly installed on the inner wall of the inclined hopper (5), the inclined hopper (5) is fixedly installed on the upper surface of the base (1), the inner wall of the inclined hopper (5) is fixedly installed with a steam pipeline (52) for conveying steam, one end of the steam pipeline (52) penetrates one end of the inclined hopper (5) and is fixedly communicated with the air outlet end of a steam generator, and the upper surface of the base (1) is fixedly installed with a screw conveyor (53), and one end of the inclined hopper (5) is fixedly communicated with the material inlet end of the screw conveyor (53).

8. The apparatus for manufacturing a slow-release fertilizer of a multi-layer structure according to claim 7, wherein: The forming mechanism further includes an outer cylinder (6) with a discharge bin door, the outer cylinder (6) is fixedly installed on the upper surface of the base (1), the outer surface of the outer cylinder (6) is fixedly installed with a heating assembly (61), the upper surface of the outer cylinder (6) is fixedly communicated with the discharge end of the screw conveyor (53), the inner wall of the outer cylinder (6) is rotatably connected with a powder wrapping disc (62), the inner wall of the powder wrapping disc (62) is fixedly connected with a connecting elastic film (63), the inner wall of the outer cylinder (6) and above the powder wrapping disc (62) is fixedly installed with a powder spraying pipeline (64), one end of the powder spraying pipeline (64) located outside the outer cylinder (6) is fixedly communicated with the conveying component conveying the fertilizer powder, the inner wall of the outer cylinder (6) is rotatably connected with a containing outer disc (65), the containing inner disc (66) is rotatably connected with the inner wall of the containing outer disc (65), the inner wall of the outer cylinder (6) is fixedly installed with the outer surface of the coating spraying pipe (67), one end of the coating spraying pipe (67) located outside the outer cylinder (6) is fixedly communicated with the conveying component conveying the coating agent.

9. The apparatus for manufacturing a slow-release fertilizer of a multi-layer structure according to claim 8, wherein: The driving mechanism includes a push hydraulic cylinder (7) fixedly installed on the upper surface of the base (1), the piston rod of the push hydraulic cylinder (7) is rotatably connected with a driving rod (71) with a long gear through a bearing at one end, the upper surface of the base (1) is fixedly installed with a driving motor (72), the output shaft of the driving motor (72) is meshed with the long gear of the driving rod (71) through a gear at one end, one end of the rotating pipe (73) is rotatably connected with the inner bottom wall of the outer cylinder (6), the lower end of the rotating pipe (73) is fixedly installed with a scraper (74), the lower surface of the scraper (74) is slidably connected with the inner bottom wall of the outer cylinder (6), the outer surface of the driving rod (71) is slidably inserted into the inner wall of the rotating pipe (73), the inner wall of the containing inner disc (66) is rotatably connected with the outer surface of the rotating pipe (73), the outer surface of the rotating pipe (73) is fixedly installed with an electromagnet group (75), the two electromagnets of the electromagnet group (75) are magnetically connected with the inner walls of the containing inner disc (66) and the containing outer disc (65) respectively, the upper end of the rotating pipe (73) is slidably inserted with a connecting sleeve (8) with a feeding port, the outer surface of the connecting sleeve (8) is fixedly installed with a connecting spring (81), one end of the connecting spring (81) is fixedly installed with the outer surface of the rotating pipe (73), the inner wall of the connecting sleeve (8) is slidably inserted with one end of the driving rod (71), the inner wall of the driving rod (71) is provided with a conveying channel (82), the outer surface of the connecting elastic film (63) is rotatably connected with the outer surface of the connecting sleeve (8), the inner wall of the connecting sleeve (8) is fixedly installed with a descending ring (83), the driving rod (71) is in contact with the upper surface of the descending ring (83) after descending, so as to drive the connecting sleeve (8) to descend, and the outer surface of the connecting sleeve (8) is slidably inserted with the inner wall of the powder wrapping disc (62).

10. A manufacturing method of a multi-layer structure slow-release fertilizer manufacturing device, using the multi-layer structure slow-release fertilizer manufacturing device according to any one of claims 1-9, characterized in that: S1: The prepared fat core is poured into the feeding bin (27), and a certain amount of fat core is transported into the powder wrapping disc (21) through the feeding bin (27). The inclined hydraulic cylinder (2) pushes the powder wrapping disc (21) to deflect left and right, and the rotary motor (32) and the conveying fan (34) on the base (1) are started. The start of the rotary motor (32) drives the stirring bucket (31) and the air stirring pipe (33) in the conveying cylinder (3) to rotate in opposite directions through the gear set transmission. The stirring bucket (31) and the air stirring pipe (33) respectively stir the fertilizer powder in the conveying cylinder (3), and the conveying fan (34) transports the sucked gas into the air stirring pipe (33). After passing through the air permeable membrane of the air stirring pipe (33), the powder inside is blown, so that the powder enters the conveying nozzle (35) through the hose on the outer cylinder (6), and the blowing of the air stirring pipe (33) increases the stirring efficiency; S2: After the swing motor (41) on the lower surface of the powder wrapping disc (21) is started, the swing motor (41) can drive the long shaft (4) to rotate through the bevel gear transmission. One long shaft (4) drives the other long shaft (4) to rotate through the cooperation of the synchronous belt and the synchronous wheel. After the two long shafts (4) drive the rotating disc (42) to rotate through the bevel gear transmission, the rotating disc (42) drives the swing handle (43) to rotate and pulls the connecting frame (44) to swing. The connecting frame (44) drives the hinged conveying nozzle (35) to swing left and right, increasing the spraying range, so that the sprayed powder can uniformly adhere to the outer surface of the rolling fat core. At the same time, a part of the gas sucked by the conveying fan (34) can enter the air inlet bucket (22) through the hose and be transported downward by the flow divider (23), preventing the powder from rising. The downward powder can uniformly adhere to the fat core. The gas in the powder wrapping disc (21) flows out through the air permeable membrane of the discharge door (25), and the powder is blocked; S3: After the first powder coating is completed, the powder wrapping disc (21) is inclined to the inclined hopper (5), so that one end of the discharge chute (24) contacts the upper surface of the inclined hopper (5). The discharge door (25) rises under the control of the discharge hydraulic cylinder (26), and the fat core coated with the first powder is transported into the inclined hopper (5) through the inclined powder wrapping disc (21), and is rolled by the partition plate (51). The steam generated by the steam generator is transported through the steam pipeline (52) to infiltrate the rolling fat core with the first structure, and the infiltrated fat core is transported into the outer cylinder (6) through the spiral conveyor (53). S3: The spiral conveyor (53) transports the soaked fertilizer core into the upper side of the connecting elastic film (63), and the powder spraying pipe (64) sprays powder onto the connecting elastic film (63). The driving motor (72) is started to drive the driving rod (71) to rotate. The rotation of the driving rod (71) drives the connecting sleeve (8) in sliding connection to rotate. The rotation of the connecting sleeve (8) drives the powder wrapping disc (62) in sliding connection to rotate, and the powder wrapping disc (62) drives the connecting elastic film (63) fixedly installed thereon to rotate, so that the gathered fertilizer core is dispersed, thereby achieving uniform powder wrapping effect. After completing the second layer powder wrapping work, the hydraulic cylinder (7) pushes the driving rod (71) to descend, so that the conveying channel (82) on the driving rod (71) and the discharge port on the connecting sleeve (8) are opposite, and the outer surface of the driving rod (71) is in contact with the descending ring (83). The descent of the driving rod (71) drives the connecting sleeve (8) to descend, the connecting spring (81) is compressed, the connecting sleeve (8) descends in the rotating pipe (73), the connecting elastic film (63) is transformed from a plane to a conical surface, the dispersed fertilizer core is gathered, enters the feeding port of the connecting sleeve (8), and is scattered on the holding inner disc (66) through the conveying channel (82) and the discharge port of the rotating pipe (73). After the fertilizer core passes through the conveying channel (82) and the discharge port to enter the holding inner disc (66), the driving rod (71) is reset, and the connecting elastic film (63) is reset. S4: The rotation of the rotating pipe (73) drives the holding inner disc (66) and the holding outer disc (65) to rotate through the energization of the electromagnet group (75), and the coating spraying pipe (67) sprays coating agent. After the fertilizer core with the second layer structure is uniformly wrapped with the coating agent, the electromagnet at the lower side of the electromagnet group (75) is de-energized, the magnetic connection between the holding outer disc (65) and the holding inner disc (66) is released, the holding inner disc (66) rotates, the holding outer disc (65) cannot rotate, the through holes on the holding inner disc (66) are consistent with the through holes on the holding outer disc (65), the de-energized electromagnet of the electromagnet group (75) is energized, the holding outer disc (65) and the holding inner disc (66) continue to rotate, the coated fertilizer core falls through the consistent through holes of the holding outer disc (65) and the holding inner disc (66) into the inner bottom wall of the outer cylinder (6), the heating assembly (61) heats the outer cylinder (6), the rotation of the rotating pipe (73) drives the scraper (74) to dry the coated fertilizer core, and the dried fertilizer is conveyed out through the discharge door.

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