A controlled-release fertilizer, its processing technology and its coating device

Abstract

This invention relates to the field of compound fertilizer production technology, specifically disclosing a controlled-release fertilizer, its processing technology, and its coating device. The device includes a support frame, a motor mounted on the surface of the support frame, a first roller shaft fixedly connected to the output end of the motor, a second roller shaft connected to one side of the first roller shaft via a conveyor belt, both the first and second roller shafts being rotatably connected to the support frame, a curing cover fixedly connected to the surface of the support frame, a feed chute on one side of the curing cover, a discharge chute on the other side of the curing cover, a blower mounted on the surface of the curing cover, an air outlet pipe fixedly connected to the outlet end of the blower, the inner cavity of the air outlet pipe communicating with the inner cavity of the curing cover, and a first ultraviolet lamp mounted on the inner top wall of the curing cover. The conveyor belt design facilitates the transport of the container, and starting the blower allows airflow to be blown into the curing cover from the air outlet pipe, accelerating heat dissipation and improving the service life of the equipment.

Description

Technical Field

[0001] This invention relates to the field of fertilizer production technology, and more specifically, to a controlled-release fertilizer, its processing technology, and its coating device. Background Technology

[0002] Fertilizers play a vital role in agricultural production, effectively improving the yield and quality of food and cash crops. With the continuous increase in the world's population, the demand for food production is also constantly increasing, leading to a continuous upward trend in fertilizer consumption. my country, as one of the world's most populous countries, is also a major consumer of fertilizers. Currently, my country's fertilizer utilization rate is low, resulting not only in a significant waste of fertilizer resources but also in a series of environmental problems, including deterioration of soil physical and chemical properties, pollution of groundwater and surface water, and the generation of large amounts of greenhouse gases, damaging the ozone layer. Controlled-release fertilizers have significant effects on improving fertilizer utilization, reducing fertilizer usage, and lowering labor costs. However, currently available controlled-release fertilizers are relatively expensive. This is partly because their coating materials are often derived from non-renewable resources such as petroleum and are non-biodegradable in soil, causing some soil pollution while achieving the purpose of slow nutrient release. Furthermore, their production technology is advanced, processes are complex, and equipment is expensive, resulting in a relatively high price for controlled-release fertilizers. Currently, the use of bio-based materials as coating materials for controlled-release fertilizers has become a hot topic. However, the production process still relies on traditional heating and curing, which not only consumes too much energy and increases costs, but also takes a long time to cure. Therefore, in order to promote the sustainable development of agriculture, a new method should be invented to make full use of some industrial and agricultural waste as coating raw materials, turning waste into treasure. At the same time, a new type of heating-free coating process should be adopted to reduce the curing time of the film material, reduce the adhesion between fertilizers and the number of times the coating liquid is sprayed, and form a film in one step, so as to produce a new type of controlled-release fertilizer that is low in cost, simple in process, and environmentally friendly.

[0003] my country is a major producer and consumer of fruit. To promote vigorous growth and better fruit quality, fruit farmers often prune fruit trees in autumn and winter. This results in a large number of pruned branches, which are usually dry and do not require dehydration. Fruit tree branches are a natural polymer complex, mainly composed of cellulose, hemicellulose, and lignin. Therefore, by liquefying and modifying these branches, they can be used as raw materials for preparing controlled-release fertilizer coatings. This transforms waste into a valuable resource, solving the problem of utilizing fruit tree branches and reducing the production cost of controlled-release fertilizers, thus promoting the common development of industry and agriculture. Summary of the Invention

[0004] This invention provides a controlled-release fertilizer, a processing technology, and a coating device thereof, aiming to solve the existing problems in the prior art.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A controlled-release fertilizer is provided, comprising the following components in parts by weight: 35-42 parts urea, 5-20 parts ammonium chloride, 13-31 parts monoammonium phosphate, 10-20 parts potassium chloride, 5 parts controlled-release coating agent, 2 parts clay, 1 part 98 sulfuric acid, and 1 part synthetic ammonia.

[0007] The effective components of nitrogen, phosphorus, and potassium are: N 22-28 parts, P2O5 6-15 parts, and K2O 6-12 parts.

[0008] The 5 parts of the controlled-release coating agent consist of 2 parts of the controlled-release agent and 3 parts of the anti-caking agent.

[0009] The above-mentioned method for preparing the anti-caking agent refers to the method described in the invention patent number ZL201711106505.6.

[0010] As a preferred embodiment of the present invention, a processing method for controlled-release fertilizer includes the following steps:

[0011] Step 1: Mix the release control agent and anti-caking agent thoroughly in the specified proportions to form a release control coating agent for later use;

[0012] Step 2: Mix solid raw materials urea, ammonium chloride, monoammonium phosphate, and potassium chloride and add them to the crushing equipment for thorough crushing and mixing. Then, send the mixture to the granulator via an elevator, add sulfuric acid and synthetic ammonia to granulate the mixture and obtain coarse particles.

[0013] Step 3: After the coarse particles from Step 2 are sieved, dried, and cooled, they are fed into a coating device for coating. The coating material is the controlled-release coating agent from Step 1, thus obtaining controlled-release fertilizer.

[0014] As a preferred embodiment of the present invention, the coating device for the controlled-release fertilizer processing technology includes a support frame, a motor mounted on the surface of the support frame, a first roller shaft fixedly connected to the output end of the motor, a second roller shaft connected to one side of the first roller shaft via a conveyor belt, both the first and second roller shafts being rotatably connected to the support frame, a curing cover fixedly connected to the surface of the support frame, a feed chute on one side of the curing cover, a discharge chute on the other side of the curing cover, a blower mounted on the surface of the curing cover, an air outlet pipe fixedly connected to the outlet end of the blower, the inner cavity of the air outlet pipe communicating with the inner cavity of the curing cover, and a first ultraviolet lamp mounted on the inner top wall of the curing cover.

[0015] As a preferred embodiment of the present invention, the inner wall of the curing cover is symmetrically rotatably connected to a first rotating rod, one end of the first rotating rod is fixedly connected to a second ultraviolet lamp, and the outer wall of the first rotating rod is provided with a torsion spring.

[0016] By adopting the above technical solution, the angle of the second ultraviolet lamp can be adjusted, making the irradiation range of the second ultraviolet lamp wider.

[0017] In a preferred embodiment of the present invention, a drive block is symmetrically fixedly connected to the surface of the conveyor belt, a track groove is symmetrically opened on the inner wall of the curing cover, a slide column is slidably connected in the track groove, a connecting plate is provided on the surface of the slide column, a cylinder is installed on the surface of the connecting plate, a connecting plate is fixedly connected to the output end of the cylinder, a turntable is rotatably connected to the end of the connecting plate away from the cylinder, a clamping plate is fixedly connected to the surface of the turntable, a slide rod is fixedly connected to the bottom of the connecting plate, a first driven block is slidably connected to the outer wall of the slide rod, the first driven block abuts against the drive block, a second driven block is slidably connected to the outer wall of the slide rod, and a third slide groove is symmetrically opened on the surface of the support frame, the second driven block is slidably connected in the third slide groove.

[0018] By adopting the above technical solution, the cylinders can move synchronously, which facilitates the light curing operation.

[0019] As a preferred embodiment of the present invention, a limiting plate is fixedly connected to the lower end of the slide rod, a spring is fixedly connected between the first driven block and the connecting plate, a fourth slide groove is symmetrically opened on the surface of the support frame, a second slider is fixedly connected to the bottom of the first driven block, the second slider is slidably connected in the corresponding fourth slide groove, and the second slider is T-shaped.

[0020] By adopting the above technical solution, the springs allow the connecting plate to automatically adjust its position according to the shape of the track groove.

[0021] As a preferred embodiment of the present invention, the trajectory groove includes a first horizontal segment, one side of the first horizontal segment is connected to a second horizontal segment through a first arc segment, one end of the second horizontal segment is connected to a third horizontal segment through a second arc segment, the first arc segment and the second arc segment are mirror-symmetrical, the first horizontal segment and the third horizontal segment are located on the same horizontal plane, and the second horizontal segment is located above the horizontal plane where the first horizontal segment is located.

[0022] By adopting the above technical solution, when clamping, it can be attached to the bottom of the barrel, so that the barrel is suspended in the air. Under the action of the barrel's center of gravity, the barrel deflects around the turntable, which facilitates the photocuring treatment of the fertilizer on the bottom of the barrel.

[0023] In a preferred embodiment of the present invention, the surface of the connecting plate is provided with a rack, the bottom of the second ultraviolet lamp is fixedly connected to a support plate by a support rod, the surface of the support plate is circumferentially arrayed with teeth, the inner wall of the curing cover is symmetrically fixedly connected to a first support plate, the inner wall of the first support plate is rotatably connected to a second rotating rod, one end of the second rotating rod is fixedly connected to a first gear, the first gear meshes with the teeth, the other end of the second rotating rod is fixedly connected to a second gear, the second gear corresponds to the rack.

[0024] By adopting the above technical solution, it is easier to drive the rotation of the second ultraviolet lamp, thereby increasing the area of ​​the second ultraviolet lamp irradiating the surface of the barrel and improving the curing efficiency.

[0025] In a preferred embodiment of the present invention, a first sliding groove is provided at the end of the connecting plate away from the cylinder, the inner diameter of the first sliding groove is the same as the outer diameter of the turntable, the turntable is slidably connected in the first sliding groove, a first slider is symmetrically fixedly connected to the outer wall of the turntable, a second sliding groove is provided on the inner wall of the connecting plate, the second sliding groove is interconnected with the first sliding groove, and the first slider is slidably connected in the second sliding groove.

[0026] By adopting the above technical solution, it is convenient for the turntable and the connecting plate to rotate relative to each other, so that the barrel can be flipped.

[0027] As a preferred embodiment of the present invention, a second support plate is fixedly connected to the side of the curing cover near the discharge trough, and the bottom of the second support plate is provided with brush bristles.

[0028] By adopting the above technical solution, it is convenient to clean the coating on the surface of the conveyor belt, thus ensuring the cleanliness of the conveyor belt surface.

[0029] Compared with the prior art, the advantages of this invention are:

[0030] (1) Start the motor to drive the first roller to rotate. Under the transmission action of the conveyor belt, the rotation of the first roller drives the second roller to rotate. The rotation of the first roller and the second roller can transport the barrel. Start the blower to blow air from the air outlet into the curing cover to accelerate heat dissipation and improve the service life of the equipment. Through the design of the second ultraviolet lamp, the ultraviolet irradiation area is increased and the curing efficiency is improved. Through the design of the first rotating rod, the deflection of the second ultraviolet lamp is facilitated. Through the design of the torsion spring, the deflection angle of the second ultraviolet lamp is easily limited and the automatic reset is achieved.

[0031] (2) By designing the limiting plate, it is convenient to limit the movement distance of the slide bar and prevent the slide bar from completely disengaging from the second driven block when moving according to the shape of the track groove. By designing the spring, it is convenient for the connecting plate to automatically adjust its position according to the shape of the track groove. By designing the fourth slide groove and the second slider, it is possible to restrict the first driven block to move only in the horizontal direction. When the slide column moves on the first horizontal section and the third horizontal section, the barrel is on the surface of the conveyor belt. When the slide column moves from the first arc section to the second horizontal section, since the center of gravity of the barrel is higher than the clamping point of the clamping plate on the barrel, when the barrel is disengaged from the conveyor belt, by designing the first slide groove, the second slide groove and the first slider, the barrel deflects around the turntable under the action of the barrel's gravity, thus facilitating the solidification treatment of the bottom surface of the barrel. By designing the second driven block, it is convenient for the driving block to abut against the second driven block when the driving block moves to the bottom of the conveyor belt, thus moving the first driven block to the initial position.

[0032] (3) When the sliding column slides in the second horizontal section, the rack meshes with the second gear. At the same time, the sliding of the sliding column in the second horizontal section drives the rack to move, thereby causing the second gear to rotate. The rotation of the second gear drives the second rotating rod to rotate, and the rotation of the second rotating rod drives the first gear to rotate. Through the design of the teeth, the rotation of the first gear drives the support plate to rotate, thereby causing the second ultraviolet lamp to deflect, thereby increasing the area of ​​the second ultraviolet lamp irradiating the surface of the barrel and improving the curing efficiency. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0034] Figure 2 This is a partial structural schematic diagram of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the second ultraviolet lamp in an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the connecting plate structure in an embodiment of the present invention;

[0037] Figure 5 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the diagram;

[0038] Figure 6 This is a schematic diagram of the connecting disc structure in an embodiment of the present invention;

[0039] Figure 7 This is a comparison diagram of various fertilization treatments in the embodiments of the present invention.

[0040] Explanation of the labels in the diagram:

[0041] 1. Support frame; 2. Motor; 3. First roller shaft; 4. Second roller shaft; 5. Conveyor belt; 6. Curing cover; 7. First ultraviolet lamp; 8. Blower; 9. Air outlet pipe; 10. Feed chute; 11. Discharge chute; 12. Drive block; 13. Track groove; 131. First horizontal section; 132. First arc-shaped section; 133. Second arc-shaped section; 134. Second horizontal section; 135. Third horizontal section; 14. First rotating rod; 15. Second ultraviolet lamp; 16. Torsion spring; 17. Sliding column; 18. Connecting plate; 19. Air... 20. Cylinder; 21. Connecting plate; 22. Clamping plate; 23. Turntable; 24. First slide groove; 25. Second slide groove; 26. First slider; 27. Slide rod; 28. First driven block; 29. ​​Limiting plate; 30. Spring; 31. Support rod; 32. Support plate; 33. Gear; 34. First gear; 35. Second gear; 36. Rack; 37. First support plate; 38. Second support plate; 39. Brush bristles; 40. Second driven block; 41. Third slide groove; 42. Fourth slide groove; 43. Second slider. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Example 1

[0044] A controlled-release fertilizer comprises the following components in parts by weight: 42 parts urea, 10 parts ammonium chloride, 25 parts monoammonium phosphate, 14 parts potassium chloride, 5 parts controlled-release coating agent, 2 parts clay, 1 part 98% sulfuric acid, and 1 part synthetic ammonia.

[0045] The effective components of nitrogen, phosphorus, and potassium are: N 22-28 parts, P2O5 6-15 parts, and K2O 6-12 parts.

[0046] The 5 parts of the controlled-release coating agent consist of 2 parts of the controlled-release agent and 3 parts of the anti-caking agent.

[0047] It should be noted that the method for preparing the anti-caking agent is based on the invention patent number ZL201711106505.6.

[0048] The above-mentioned controlled-release fertilizer processing technology includes the following steps:

[0049] Step 1: Mix the release control agent and anti-caking agent thoroughly in the specified proportions to form a release control coating agent for later use;

[0050] Step 2: Mix solid raw materials urea, ammonium chloride, monoammonium phosphate, and potassium chloride and add them to the crushing equipment for thorough crushing and mixing. Then, send the mixture to the granulator via an elevator, add sulfuric acid and synthetic ammonia to granulate the mixture and obtain coarse particles.

[0051] Step 3: After the coarse particles from Step 2 are sieved, dried, and cooled, they are fed into a coating device for coating. The coating material is the controlled-release coating agent from Step 1, thus obtaining controlled-release fertilizer.

[0052] Example 2

[0053] Please see Figure 1-2 A coating device for controlled-release fertilizer processing includes a support frame 1. A motor 2 is mounted on the surface of the support frame 1. A first roller 3 is fixedly connected to the output end of the motor 2. A second roller 4 is connected to one side of the first roller 3 via a conveyor belt 5. Both the first roller 3 and the second roller 4 are rotatably connected to the support frame 1. When the motor 2 is started, the first roller 3 is driven to rotate. Under the transmission action of the conveyor belt 5, the rotation of the first roller 3 drives the second roller 4 to rotate. The rotation of the first roller 3 and the second roller 4 can transport the barrel. A curing cover 6 is fixedly connected to the surface of the support frame 1. A feed chute 10 is opened on one side of the curing cover 6, and a discharge chute 11 is opened on the other side of the curing cover 6. A blower 8 is mounted on the surface of the curing cover 6. An air outlet pipe 9 is fixedly connected to the outlet end of the blower 8. The inner cavity of the air outlet pipe 9 is connected to the inner cavity of the curing cover 6. When the blower 8 is started, airflow is blown into the curing cover 6 from the air outlet pipe 9 to accelerate heat dissipation and improve the service life of the equipment. A first ultraviolet lamp 7 is installed on the inner top wall of the curing cover 6.

[0054] Example 3

[0055] Please see Figure 2-3 The inner wall of the curing cover 6 is symmetrically connected to a first rotating rod 14. The design of the first rotating rod 14 facilitates the deflection of the second ultraviolet lamp 15. One end of the first rotating rod 14 is fixedly connected to the second ultraviolet lamp 15. The design of the second ultraviolet lamp 15 increases the ultraviolet irradiation area and improves the curing efficiency. The outer wall of the first rotating rod 14 is provided with a torsion spring 16. The design of the torsion spring 16 facilitates the limitation of the deflection angle of the second ultraviolet lamp 15 and automatic reset.

[0056] Example 4

[0057] Please see Figure 4A drive block 12 is symmetrically fixedly connected to the surface of the conveyor belt 5. Track grooves 13 are symmetrically opened on the inner wall of the curing cover 6. A sliding column 17 is slidably connected within the track groove 13. A connecting plate 18 is provided on the surface of the sliding column 17. A cylinder 19 is mounted on the surface of the connecting plate 18. A connecting disc 20 is fixedly connected to the output end of the cylinder 19. A turntable 22 is rotatably connected to the end of the connecting disc 20 away from the cylinder 19. A clamping plate 21 is fixedly connected to the surface of the turntable 22. A sliding rod 26 is fixedly connected to the bottom of the connecting plate 18. A first driven block 27 is slidably connected to the outer wall of the sliding rod 26, and the first driven block 27 abuts against the drive block 12. A second driven block 40 is slidably connected to the outer wall of the sliding rod 26. The design of the second driven block 40 facilitates the operation of the drive block... When the drive block 12 moves to the bottom of the conveyor belt 5, it abuts against the second driven block 40, which can move the first driven block 27 to the initial position. The surface of the support frame 1 is symmetrically provided with a third sliding groove 41. The second driven block 40 is slidably connected in the third sliding groove 41. The barrel is placed on the surface of the conveyor belt 5, and the conveyor belt 5 moves, thereby conveying the barrel from the feed chute 10 to the inner cavity of the curing cover 6. When the drive block 12 abuts against the corresponding first driven block 27, the cylinder 19 is activated to push the turntable 22 toward the barrel, so that the clamping plate 21 clamps the bottom of the barrel. The conveyor belt 5 continues to convey. Through the design of the third sliding groove 41, the second driven block 40, the track groove 13, and the sliding column 17, the connecting plate 18 moves toward the discharge chute 11.

[0058] Please see Figure 4 The lower end of the slide bar 26 is fixedly connected to a limiting plate 28. The design of the limiting plate 28 facilitates the restriction of the movement distance of the slide bar 26 and prevents the slide bar 26 from completely disengaging from the second driven block 40 when moving according to the shape of the track groove 13. A spring 29 is fixedly connected between the first driven block 27 and the connecting plate 18. The design of the spring 29 facilitates the automatic adjustment of the position of the connecting plate 18 according to the shape of the track groove 13. The surface of the support frame 1 is symmetrically provided with a fourth slide groove 42. A second slider 43 is fixedly connected to the bottom of the first driven block 27. The second slider 43 is slidably connected in the corresponding fourth slide groove 42. The second slider 43 is T-shaped. The design of the fourth slide groove 42 and the second slider 43 can restrict the first driven block 27 to move only in the horizontal direction.

[0059] Example 5

[0060] Please see Figure 5The track groove 13 includes a first horizontal section 131. One side of the first horizontal section 131 is connected to a second horizontal section 134 through a first arc section 132. One end of the second horizontal section 134 is connected to a third horizontal section 135 through a second arc section 133. The first arc section 132 and the second arc section 133 are mirror images of each other. The first horizontal section 131 and the third horizontal section 135 are located on the same horizontal plane. The second horizontal section 134 is located above the horizontal plane where the first horizontal section 131 is located. When the sliding column 17 moves on the first horizontal section 131 and the third horizontal section 135, the barrel is always on the surface of the conveyor belt 5. When the sliding column 17 moves from the first arc section 132 to the second horizontal section 134, since the center of gravity of the barrel is higher than the clamping point of the clamping plate 21 on the barrel, when the barrel leaves the conveyor belt 5, since the connecting plate 20 is rotatably connected to the turntable 22, the barrel deflects around the turntable 22 under the action of the barrel's gravity, thus facilitating the curing treatment of the bottom surface of the barrel.

[0061] Example 6

[0062] Please see Figure 3-4 The surface of the connecting plate 18 is provided with a rack 36. The bottom of the second ultraviolet lamp 15 is fixedly connected to a support plate 31 via a support rod 30. The surface of the support plate 31 has a circumferential array of teeth 32. The inner wall of the curing cover 6 is symmetrically fixedly connected to a first support plate 37. The inner wall of the first support plate 37 is rotatably connected to a second rotating rod 34. One end of the second rotating rod 34 is fixedly connected to a first gear 33, which meshes with the teeth 32. The other end of the second rotating rod 34 is fixedly connected to a second gear 35, which corresponds to the rack 36. When the sliding column 17 is at the second horizontal... When sliding within segment 134, rack 36 meshes with second gear 35. Simultaneously, the sliding of slide column 17 within the second horizontal segment 134 causes rack 36 to move, thereby causing second gear 35 to rotate. The rotation of second gear 35 causes second rotating rod 34 to rotate, and the rotation of second rotating rod 34 causes first gear 33 to rotate. Through the design of teeth 32, the rotation of first gear 33 causes support disk 31 to rotate, thereby causing second ultraviolet lamp 15 to deflect, thus increasing the area of ​​second ultraviolet lamp 15 irradiating the surface of the barrel and improving curing efficiency.

[0063] Example 7

[0064] Please see Figure 6The connecting plate 20 has a first groove 23 at the end away from the cylinder 19. The inner diameter of the first groove 23 is the same as the outer diameter of the turntable 22. The turntable 22 is slidably connected in the first groove 23. The outer wall of the turntable 22 is symmetrically fixedly connected with a first slider 25. The inner wall of the connecting plate 20 has a second groove 24. The second groove 24 is connected to the first groove 23. The first slider 25 is slidably connected in the second groove 24. Through the design of the first groove 23, the second groove 24 and the first slider 25, it is convenient for the turntable 22 and the connecting plate 20 to rotate relative to each other.

[0065] Example 8

[0066] Please see Figure 1 A second support plate 38 is fixedly connected to the side of the curing cover 6 near the discharge chute 11. The bottom of the second support plate 38 is provided with bristles 39. The design of the bristles 39 makes it easy to clean the coating on the surface of the conveyor belt 5, ensuring the cleanliness of the surface of the conveyor belt 5.

[0067] In this embodiment:

[0068] The barrel is placed on the surface of the conveyor belt 5. The motor 2 is started to drive the first roller 3 to rotate. Under the transmission action of the conveyor belt 5, the rotation of the first roller 3 drives the second roller 4 to rotate. The rotation of the first roller 3 and the second roller 4 can transport the barrel. When the drive block 12 abuts against the corresponding first driven block 27, the cylinder 19 is started to push the turntable 22 toward the barrel, so that the clamping plate 21 clamps the bottom of the barrel. The conveyor belt 5 continues to transport the barrel so that the connecting plate 18 moves toward the discharge chute 11. When the sliding column 17 moves on the first horizontal section 131 and the third horizontal section 135, the barrel is always on the surface of the conveyor belt 5.

[0069] When the sliding column 17 moves from the first arc section 132 to the second horizontal section 134, since the center of gravity of the barrel is higher than the clamping point of the clamping plate 21, when the barrel leaves the conveyor belt 5, through the design of the first sliding groove 23, the second sliding groove 24, and the first sliding block 25, the barrel deflects around the turntable 22 under the action of gravity, which facilitates the solidification treatment of the bottom surface of the barrel. When the sliding column 17 slides in the second horizontal section 134, the rack 36 meshes with the second gear 35. At the same time, the sliding of the sliding column 17 in the second horizontal section 134 drives the rack 36 to move, thereby causing the second gear 35 to rotate. The rotation of the second gear 35 drives the second rotating rod 34 to rotate, and the rotation of the second rotating rod 34 drives the first gear 33 to rotate.

[0070] By designing the teeth 32, the rotation of the first gear 33 drives the support disk 31 to rotate, thereby deflecting the second ultraviolet lamp 15, which increases the area of ​​the second ultraviolet lamp 15 irradiating the surface of the barrel, further improving the curing efficiency. By designing the second driven block 40, when the drive block 12 moves to the bottom of the conveyor belt 5, the drive block 12 and the second driven block 40 come into contact, which can move the first driven block 27 to the initial position. After being coated by the coating device, controlled-release fertilizer is obtained.

[0071] Comparative Example 1

[0072] The raw materials used are the same as those in Example 8. However, the coating device used in Example 8 is not used in the processing technology. Instead, a conventional coating kiln is used for coating to obtain Comparative Example D1 controlled-release fertilizer.

[0073] Evaluation test:

[0074] I. Storage Experiment (1)

[0075] 1) Experimental objective: This experiment aims to determine the powdering situation during storage of controlled-release fertilizers produced using different processes;

[0076] 2) Experimental fertilizers: The controlled-release fertilizer F8 from Example 8 and the control fertilizer D1 were selected;

[0077] 3) Experimental apparatus: speed-regulating oscillator

[0078] 4) Test method: Take 1500.0g of fertilizer sample (the capacity of the self-sealing bag is 2000.0g) into a self-sealing bag, seal it, place it in a speed-adjustable shaker and shake for 30 minutes, stop for 2 minutes, shake for another 30 minutes, shake again, and then sieve to remove the powder. Weigh the granules. The weight is shown in Table 1 below.

[0079] Table 1. Particle weight after sieving

[0080]

[0081] As shown in Table 1, both F8 and D1 controlled-release fertilizer granules have high coating strength. However, after the coating process of this application, F8 controlled-release fertilizer granules have higher coating strength, and almost no coating powder falls off the F8 granules.

[0082] II. Storage Experiment (2)

[0083] 1) Experimental objective: This experiment aims to determine the clumping situation of controlled-release fertilizers stored under different production methods;

[0084] 2) Experimental fertilizers: The controlled-release fertilizer F8 from Example 8 and the control fertilizer D1 were selected;

[0085] 3) Test Method: Place the fertilizer sample in a desiccant device, controlling the relative humidity at 96% and the temperature at 60℃. After 4 hours, remove the sample and transfer it to a 60℃ oven to dry. When the moisture content of the experimental fertilizer is 2-3%, pack the experimental fertilizer into sealed bags of 1kg each and heat them in a 60℃ oven for 4 hours. After removing them, place them in a 10℃ environment and cool for 3 hours. During the heating-cooling process, place a heavy object on top of the sealed bag to subject it to a pressure of 10kPa. Repeat the above experimental conditions, and after one more cycle of heating-cooling, drop the sealed bag horizontally from a height of 0.5 meters onto a hard surface. Remove the fertilizer from the sealed bag and separate the clumped and unclumped fertilizers. Weigh them and calculate the clumping rate using the following formula:

[0086] Clumping rate = (mass of clumped fertilizer / total mass of fertilizer in the sealed bag) * 100%

[0087] Table 2. Results of agglomeration experiments with different fertilizers. Each experiment was repeated three times.

[0088] 1 F8 0.01 2 D1 2.50

[0089] As shown in Table 2, the caking rate of both F8 and D1 fertilizer granules is lower than the industry-accepted 3%. A rate higher than 3% is considered to indicate that the fertilizer has caking, while a rate lower than 3% is considered to indicate that the caking is mild or non-caking. Obviously, compared with F8 granules, the caking rate of D1 fertilizer granules has increased, and the caking phenomenon tends to be aggravated. This indicates that the coating device provided in this application can reduce the caking phenomenon.

[0090] III. Nutrient Release Experiment in Soil

[0091] 1) Experimental subjects:

[0092] Example 8: Controlled-release fertilizer F8 and control fertilizer D1

[0093] 2) Experimental methods:

[0094] Under greenhouse conditions, a 5cm diameter glass-soil column was sealed at the bottom with a 100-mesh sieve. 25g of sand was placed on the sieve, followed by 200g of air-dried soil (without fertilizer) and compacted. Then, a mixture of 200g soil and 10g fertilizer was compacted to the same degree. Another 200g of air-dried soil (without fertilizer) was placed on top and compacted. Finally, 25g of sand was added, and a ground-glass three-necked flask was attached to the bottom of the column. 50mL of deionized water was added gradually until the soil in the column was nearly saturated. After 24 hours of cultivation, a simulated natural... Under rain conditions, the sample was rinsed with 100 mL of water on days 3, 7, 10, 14, 21, 28, and 35. The total nutrient content of the leaching effluent was measured according to GB / T15063-2009. A control group without fertilization was used, and fertilizer D1 served as a parallel control. Each sample was measured three times in parallel. The cumulative nutrient release rate for each fertilization treatment was calculated as the ratio of the difference between the cumulative nutrient release of each fertilization treatment and the cumulative nutrient release of the unfertilized treatment to the total nutrient content of each fertilization treatment. Figure 7 As shown;

[0095] Depend on Figure 7 It can be seen that the total nutrient release of controlled-release fertilizer in the soil changes over time. The total nutrient release rate of the controlled-release fertilizer provided by this invention and the slope of the line connecting the release rates are both lower than those of the control fertilizer. This shows that the controlled-release fertilizer provided by this invention has the effect of controlling nutrient release and promotes the improvement of fertilizer utilization.

[0096] 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 its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A coating device for controlled-release fertilizer processing, comprising a support frame (1), characterized in that: A motor (2) is mounted on the surface of the support frame (1). A first roller shaft (3) is fixedly connected to the output end of the motor (2). A second roller shaft (4) is connected to one side of the first roller shaft (3) via a conveyor belt (5). Both the first roller shaft (3) and the second roller shaft (4) are rotatably connected to the support frame (1). A curing cover (6) is fixedly connected to the surface of the support frame (1). One side of the curing cover (6) is a feed trough (10), and the other side is a discharge trough (11). A blower (8) is mounted on the surface of the curing cover (6). An air outlet pipe (9) is fixedly connected to the outlet end of the blower (8). The inner cavity of the air outlet pipe (9) is connected to the inner cavity of the curing cover (6). A first ultraviolet lamp (7) is mounted on the inner top wall of the curing cover (6). The surface of the conveyor belt (5) is symmetrically fixedly connected with a drive block (12). The inner wall of the curing cover (6) is symmetrically opened with a track groove (13). A slide column (17) is slidably connected in the track groove (13). A connecting plate (18) is provided on the surface of the slide column (17). A cylinder (19) is installed on the surface of the connecting plate (18). A connecting plate (20) is fixedly connected to the output end of the cylinder (19). A turntable (22) is rotatably connected to the end of the connecting plate (20) away from the cylinder (19). A clamping plate (21) is fixedly connected to the surface of the turntable (22). A slide rod (26) is fixedly connected to the bottom of the connecting plate (18). A first driven block (27) and a second driven block (40) are slidably connected to the outer wall of the slide rod (26). The first driven block (27) abuts against the drive block (12). A third slide groove (41) is symmetrically opened on the surface of the support frame (1). The second driven block (40) is slidably connected in the third slide groove (41). The lower end of the slide bar (26) is fixedly connected to a limiting plate (28), and a spring (29) is fixedly connected between the first driven block (27) and the connecting plate (18). The surface of the support frame (1) is symmetrically provided with a fourth slide groove (42). The bottom of the first driven block (27) is fixedly connected to a second slider (43). The second slider (43) is slidably connected in the corresponding fourth slide groove (42). The second slider (43) is T-shaped. The trajectory groove (13) includes a first horizontal segment (131), one side of the first horizontal segment (131) is connected to a second horizontal segment (134) through a first arc segment (132), one end of the second horizontal segment (134) is connected to a third horizontal segment (135) through a second arc segment (133), the first arc segment (132) and the second arc segment (133) are mirror symmetrical, the first horizontal segment (131) and the third horizontal segment (135) are located on the same horizontal plane, and the second horizontal segment (134) is located above the horizontal plane where the first horizontal segment (131) is located.

2. The coating device for controlled-release fertilizer processing according to claim 1, characterized in that: The inner wall of the curing cover (6) is symmetrically rotatably connected to a first rotating rod (14), one end of the first rotating rod (14) is fixedly connected to a second ultraviolet lamp (15), and a torsion spring (16) is provided on the outer wall of the first rotating rod (14).

3. A coating device for controlled-release fertilizer processing according to claim 2, characterized in that: The surface of the connecting plate (18) is provided with a rack (36). The bottom of the second ultraviolet lamp (15) is fixedly connected to a support plate (31) via a support rod (30). The surface of the support plate (31) is circumferentially arrayed with teeth (32). The inner wall of the curing cover (6) is symmetrically fixedly connected with a first support plate (37). The inner wall of the first support plate (37) is rotatably connected with a second rotating rod (34). One end of the second rotating rod (34) is fixedly connected with a first gear (33). The first gear (33) meshes with the teeth (32). The other end of the second rotating rod (34) is fixedly connected with a second gear (35). The second gear (35) corresponds to the rack (36).

4. A coating device for controlled-release fertilizer processing according to claim 1, characterized in that: The connecting plate (20) has a first sliding groove (23) at the end away from the cylinder (19). The inner diameter of the first sliding groove (23) is the same as the outer diameter of the turntable (22). The turntable (22) is slidably connected in the first sliding groove (23). The outer wall of the turntable (22) is symmetrically fixedly connected with a first slider (25). The inner wall of the connecting plate (20) has a second sliding groove (24). The second sliding groove (24) is connected to the first sliding groove (23). The first slider (25) is slidably connected in the second sliding groove (24).

5. A coating device for controlled-release fertilizer processing according to claim 1, characterized in that: The curing cover (6) is fixedly connected to a second support plate (38) on the side near the discharge trough (11), and the bottom of the second support plate (38) is provided with bristles (39).

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