Rotary cutting type high-tower granulator for fertilizer preparation and method

Abstract

The invention relates to the technical field of fertilizer processing, in particular to a rotary cutting type high-tower granulator for fertilizer preparation and a method thereof.The rotary cutting type high-tower granulator comprises a supporting barrel, a rotary disc is rotatably arranged at the lower end in the supporting barrel, a driving shaft rotatably penetrates through the supporting barrel, a pressing plate is slidably arranged in the supporting barrel, and a stock bin is formed between the pressing plate and the rotary disc; a plurality of pressing holes are formed in the turntable; a rotary cutter is arranged at the bottom of the supporting cylinder; the rotary cutter comprises a cutting disc arranged at the bottom of the supporting cylinder and located at the lower end of the rotary disc, and a discharging port is formed in the cutting disc. After falling below the sieve plate, too small particles and fine powder enter the bottom of the recovery pipe along the guide slope arranged at the bottom of the bottom cover, the rotating spiral blade conveys the too small particles and the fine powder upwards, so that the fine powder and the like enter the feeding hopper again to be stored and wait for entering the stock bin together with raw materials next time, and the recovery efficiency is improved. Therefore, not only is waste reduced, but also guarantee is provided for high-quality and high-efficiency production.

Description

Technical Field

[0001] The present application relates to the technical field of fertilizer processing, and in particular to a rotary cutting high tower granulator and method for fertilizer preparation. Background Art

[0002] Fertilizers are indispensable and important substances in agricultural production. They promote crop growth, increase yield and improve quality by providing nutrients required for plant growth, such as nitrogen, phosphorus, potassium, etc.

[0003] Fertilizer, the "food" that sustains crop growth, is in increasing demand. However, traditional fertilizer production methods suffer from high energy consumption, significant pollution, and inconsistent product quality, making them inadequate for modern agriculture. Therefore, developing efficient, environmentally friendly, and energy-saving fertilizer production technologies is a pressing need.

[0004] The tower granulator heats and melts raw materials such as urea, ammonium nitrate, monoammonium phosphate, and potassium chloride to form a molten slurry with good fluidity. This process is usually carried out at high temperature to ensure complete melting and uniform mixing of the materials. The molten slurry is sprayed into the tower through a rotating nozzle at the top of the tower. The high-speed rotation and centrifugal force of the nozzle make the slurry evenly distributed, forming fine droplets. These droplets exchange heat with the rising air flow during the descent process, gradually cool down and solidify into granules.

[0005] For example, the fertilizer granulator with application number CN201810846522.1 relates to the field of fertilizer processing technology. The existing technology includes a chassis, a granulation barrel, a granulation plate, a granulation hole, a spiral feeding rod, a blade, a first bevel gear, a push plate, a pushing part, a storage barrel, a one-way valve, and a guide plate. The upper end face of the chassis is provided with an output axially arranged motor, the output shaft of the motor is coaxially connected to the spiral feeding rod, one side of the chassis is rotatably connected to a horizontal shaft, a cam and a coaxial second bevel gear are provided on the horizontal shaft, the first bevel gear is meshed with the second bevel gear, a push rod is hinged on one side of the guide plate, the upper end of the push rod is slidably connected to the cam, and a discharge port is provided at the lower part of the chassis.

[0006] However, the above-mentioned prior art still has some defects when it comes to fertilizer granulation: The above-mentioned prior art drives the spiral feeding rod, the blade and the first bevel gear to rotate by the rotation of the motor. The blade rotates with the spiral feeding rod to cut the extruded fertilizer raw materials into particles. The fertilizer particles fall on the guide plate and come into contact with the wrapping. During the rolling process, the wrapping is wrapped around the surface of the fertilizer particles. When the guide plate swings, the wrapped fertilizer particles are discharged from the discharge port of the chassis.

[0007] In actual application, due to the cutting action of the blade, when the fertilizer raw materials are broken into particles, some fine particles or powder will inevitably be produced. These fine particles or powder are caused by the failure of the raw materials to completely form uniform particles during the cutting process, or they are ground at the cutting edge. These fine particles or powder will fall onto the guide plate together with the cut fertilizer particles.

[0008] On the guide plate, the fertilizer particles come into contact with the wrapping and begin to roll, and the wrapping gradually wraps around the surface of the fertilizer particles. However, fine particles or powders are not effectively wrapped by the wrapping. They will mix with the fertilizer particles or flow freely on the guide plate. The presence of fine powders will affect the overall quality of the fertilizer particles and may lead to a decrease in product consistency.

[0009] Based on this, under the statement of the above viewpoints, the existing technology for fertilizer granulation still has room for improvement. Summary of the Invention

[0010] In order to solve the above technical problems, the present application provides a rotary cutting high tower granulator and method for fertilizer preparation, which adopts the following technical solutions: In a first aspect, a rotary cutting high-tower granulator for fertilizer preparation includes a support cylinder, a turntable rotatably disposed at the lower end of the support cylinder, a drive shaft rotatably passing through the support cylinder, the lower end of the drive shaft being connected to the turntable, a pressure plate slidably disposed within the support cylinder, the pressure plate being threadedly connected to the drive shaft, a material bin being formed between the pressure plate and the turntable, a plurality of pressing holes distributed in a matrix are opened on the turntable, and a rotary cutter is provided at the bottom of the support cylinder; The rotary cutter includes a cutting disc arranged at the bottom of the supporting cylinder and located at the lower end of the turntable. A discharge port is provided on the cutting disc, and a chute is provided on one side of the discharge port. A sealing plate is slidably arranged in the chute, and the sealing plate is fan-shaped and corresponds to the discharge port.

[0011] Preferably, a slice is provided at one end of the sealing plate, the slice contacts the turntable, a limiting screw is rotatably provided on the turntable, the limiting screw corresponds to the sealing plate, and the sealing plate is pressed against the limiting screw to limit the position.

[0012] Preferably, a screen is provided at the lower end of the support cylinder; The screener includes a bottom cover arranged at the lower end of the support cylinder, a sieve plate is arranged in the bottom cover, and the sieve plate is arranged at an angle on the bottom cover. A discharge port is provided on the bottom cover, and the discharge port is located at the bottom end of the inclined direction of the sieve plate.

[0013] Preferably, the sieve plate includes an upper plate arranged in the bottom cover, the upper plate is provided with upper sieve holes, a lower plate is rotatably arranged on the upper plate, and the lower plate is provided with lower sieve holes corresponding to the sieve holes; A pin rod is rotatably provided on the upper plate and is threadedly connected thereto, and the pin rod corresponds to the lower plate.

[0014] Preferably, the sieve plate is slidably arranged in the bottom cover, and the drive shaft rotates and penetrates the sieve plate, and a reciprocating thread groove that cooperates with the thread of the sieve plate is provided on the drive shaft.

[0015] Preferably, a feed pipe connected to the silo is provided on one side of the bottom cover, and a feed funnel is provided on the upper end of the feed pipe.

[0016] Preferably, a connecting rod is slidably provided through one end of the feed pipe, a piston corresponding to one end of the feed pipe is provided at one end of the connecting rod, and a return spring is provided between the end of the connecting rod located outside the feed pipe and the feed pipe.

[0017] Preferably, a limiting ring located inside the feed pipe is provided on the connecting rod.

[0018] Preferably, a guiding slope is provided on the bottom of the bottom cover.

[0019] In a second aspect, a rotary cutting high tower granulation method for fertilizer preparation comprises the following steps: S1: Granulation preparation. When granulating fertilizer, the raw materials are put into the feed pipe from the feed hopper and enter the silo; S2: Extrusion granulation: The motor drives the drive shaft to rotate, which drives the turntable connected to its lower end to rotate synchronously. At the same time, the pressing plate moves downward through the threaded connection with the drive shaft, reducing the space in the silo and pushing the raw materials downward. The raw materials are squeezed out by the pressing hole and are evenly distributed during the extrusion process to form continuous material strips. S3: Continuous granulation: As the turntable rotates, the material strips are continuously squeezed out from the pressing hole and contact the slices on the sealing plate. The relative movement between the slices and the turntable cuts the material strips into uniform fertilizer particles. S4: Granulation screening. When the fertilizer particles are cut off, they will fall on the screen plate. Due to the inclined setting of the screen plate, smaller fertilizer particles and fine powder will pass through the sieve holes on the screen plate and fall to the bottom of the bottom cover.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. After the oversized particles and fine powder of the present invention fall under the sieve plate, they will follow the guiding slope provided at the bottom of the bottom cover into the bottom of the recovery pipe. The rotating spiral blades will transport the oversized particles and fine powder upward, so that the fine powder and the like will enter the feed funnel for storage again, and will enter the silo together with the raw materials next time. This not only reduces waste, but also provides a guarantee for high-quality and high-efficiency production.

[0021] 2. The sieve plate of the present invention will perform an up and down reciprocating motion. This motion helps prevent the sieve holes from being blocked and ensures that the fertilizer particles can continue to pass through the sieve holes effectively during the screening process. The reciprocating motion of the sieve plate causes the fertilizer particles to be constantly disturbed during the screening process, which helps smaller particles and fine powders pass through the sieve holes. This dynamic screening method improves screening efficiency and ensures the continuity and effectiveness of the screening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 It is a cross-sectional view of the support cylinder of the present invention.

[0024] Figure 3 It is a cross-sectional view of the rotary cutter of the present invention.

[0025] Figure 4 It is a structural schematic diagram of the rotary cutter of the present invention.

[0026] Figure 5 This invention Figure 4 A partial enlarged view of point A in the middle.

[0027] Figure 6 It is a cross-sectional view between the rotary cutter and the screener of the present invention.

[0028] Figure 7 It is a cross-sectional view of the sieve plate of the present invention.

[0029] Figure 8 It is a sectional plan view between the rotary cutter and the screener of the present invention.

[0030] Figure 9 It is a structural schematic diagram of the recycling part of the present invention.

[0031] Figure 10 It is a cross-sectional view between the feed pipe and the feed funnel of the present invention.

[0032] Explanation of the accompanying symbols: 1. Support cylinder; 2. Turntable; 21. Pressing hole; 3. Drive shaft; 4. Pressing plate; 41. Hopper; 5. Peeler; 51. Cutting disc; 52. Discharge port; 53. Slide; 54. Sealing plate; 55. Slicer; 56. Limiting screw; 6. Screener; 61. Bottom cover; 611. Guide slope; 62. Discharge port; 63. Screen plate; 631. Upper plate; 632. Upper sieve hole; 633. Lower plate; 634. Lower sieve hole; 64. Pin; 65. Reciprocating thread groove; 66. Feed pipe; 661. Feed funnel; 67. Connecting rod; 671. Piston; 68. Return spring; 69. Limiting ring; 7. Recovery part; 71. Recovery pipe; 72. Drive shaft; 73. Spiral blade. DETAILED DESCRIPTION

[0033] The following combination Figures 1 to 10 This application is described in further detail.

[0034] The embodiment of the present application discloses a rotary cutting high-tower granulator and method for fertilizer preparation. By extruding the raw material, the material strips are continuously extruded and cut into uniform fertilizer particles. The particles that are too small and the fine powder are recovered and extruded again, thereby realizing the recovery and reuse of the fine powder and improving the raw material utilization rate and production efficiency.

[0035] Example 1: Reference Figure 1 and Figure 2 As shown, a rotary cutting high tower granulator for fertilizer preparation includes a supporting cylinder 1, a turntable 2 is rotatably provided at the lower end of the supporting cylinder 1, a driving shaft 3 is rotatably passed through the supporting cylinder 1, the lower end of the driving shaft 3 is connected to the turntable 2, a pressing plate 4 is slidably provided in the supporting cylinder 1, and a hopper 41 is formed between the pressing plate 4 and the turntable 2.

[0036] When granulating fertilizer, the raw materials are first placed in the silo 41 formed between the pressing plate 4 and the turntable 2, and then the driving shaft 3 is driven to rotate by the motor. The rotating driving shaft 3 will drive the turntable 2 connected to its lower end to rotate synchronously. At the same time, the pressing plate 4 moves downward through the threaded connection with the driving shaft 3, reducing the space in the silo 41 and thus pushing the raw materials downward.

[0037] The raw material is compressed and extruded from a plurality of pressing holes 21 opened on the turntable 2, and the plurality of pressing holes 21 are distributed in a matrix. The raw material can be evenly distributed during the extrusion process to form a continuous material strip. During this process, the rotary cutter 5 provided at the bottom of the support cylinder 1 cuts the material strip to form uniform fertilizer particles.

[0038] Reference Figure 3 、 Figure 4 and Figure 5 As shown, specifically, the rotary cutter 5 includes a cutting disc 51 arranged at the bottom of the supporting cylinder 1 and located at the lower end of the turntable 2. A discharge port 52 is provided on the cutting disc 51, and a slide groove 53 is provided on one side of the discharge port 52. A sealing plate 54 is slidingly provided in the slide groove 53, and the sealing plate 54 is fan-shaped and corresponds to the discharge port 52.

[0039] The cutting disc 51 will block the pressing hole 21. The cutting disc 51 covers the bottom of the pressing hole 21 so that the extruded material strips can only be discharged from the discharge port 52. During the rotation of the turntable 2, the extruded material strips will contact the slice 55 set at one end of the sealing plate 54. The relative movement of the slice 55 and the turntable 2 will cut off the material strips.

[0040] As the turntable 2 rotates, the material strips are continuously squeezed out from the pressing holes 21 and contact the slices 55 on the sealing plate 54. The relative movement between the slices 55 and the turntable 2 cuts the material strips and cuts them into uniform fertilizer particles. The cutting process is continuous. As the turntable 2 continues to rotate, new material strips are continuously squeezed out and cut.

[0041] A limiting screw 56 is rotatably provided on the turntable 2 and matched with its thread. The limiting screw 56 corresponds to the sealing plate 54 and is pressed against the sealing plate 54 to limit the position.

[0042] Before production begins, the limiting screw 56 is rotated to release the limit on the sealing plate 54 through threaded engagement, and then the slice 55 is moved to move the sealing plate 54 in the slide groove 53, thereby changing the size of the discharge port 52. The movement of the sealing plate 54 directly affects the opening area of ​​the discharge port 52; when the sealing plate 54 moves toward the discharge port 52, the discharge port 52 becomes larger, and the material strips can be discharged faster; conversely, when the sealing plate 54 moves in the opposite direction, the discharge port 52 becomes smaller, and the discharge speed of the material strips slows down.

[0043] After the sealing plate 54 is adjusted to the right position, the limiting screw 56 is rotated again so that the limiting screw 56 is pressed against the sealing plate 54 to limit the position. Reference Figure 6 、 Figure 7 and Figure 8 As shown, a sifter 6 is provided at the lower end of the support cylinder 1 , which allows fertilizer particles that meet size requirements to be retained while screening out particles that are too small and fine powder.

[0044] Specifically, the screener 6 includes a bottom cover 61 arranged at the lower end of the support cylinder 1, a sieve plate 63 is arranged in the bottom cover 61, and the sieve plate 63 is arranged at an angle on the bottom cover 61, and a discharge port 62 is opened on the bottom cover 61, and the discharge port 62 is located at the bottom end of the inclined direction of the sieve plate 63.

[0045] When the fertilizer particles are cut, they will fall onto the sieve plate 63. Due to the inclined setting of the sieve plate 63, smaller fertilizer particles and fine powder will pass through the sieve holes on the sieve plate 63 and fall into the bottom of the bottom cover 61. These materials are separated because their sizes do not meet the requirements. Fertilizer particles of qualified size cannot pass through the sieve plate 63 because their sizes are larger than the size of the sieve holes. Instead, they move along the inclined direction of the sieve plate 63. Qualified fertilizer particles move along the inclined direction of the sieve plate 63 and are finally discharged from the discharge port 62 on the bottom cover 61.

[0046] Moreover, the sieve plate 63 is slidably arranged in the bottom cover 61 , and the drive shaft 3 rotates and penetrates the sieve plate 63 . A reciprocating thread groove 65 that is threadably matched with the sieve plate 63 is formed on the drive shaft 3 .

[0047] During the rotation of the drive shaft 3, the reciprocating thread groove 65 enables the drive shaft 3 to convert the rotational motion into the linear reciprocating motion of the sieve plate 63. As the drive shaft 3 continues to rotate, the sieve plate 63 reciprocates up and down. This movement mode helps prevent the sieve holes from being blocked and ensures that the fertilizer particles can continue to pass through the sieve holes effectively during the screening process.

[0048] The reciprocating movement of the sieve plate 63 causes the fertilizer particles to be constantly disturbed during the screening process, which helps smaller particles and fine powders to pass through the sieve holes. This dynamic screening method improves the screening efficiency and ensures the continuity and effectiveness of the screening process.

[0049] The sieve plate 63 includes an upper plate 631 provided in the bottom cover 61 , with upper sieve holes 632 defined thereon, and a lower plate 633 rotatably provided on the upper plate 631 , with lower sieve holes 634 corresponding to the sieve holes defined thereon.

[0050] By rotating the pin rod 64 rotatably provided on the upper plate 631, the pin rod 64 and the lower plate 633 are correspondingly threadedly connected with the upper plate 631 to limit the lower plate 633, and then the pin rod 64 is rotated to release the limit on the lower plate 633. At this time, the lower plate 633 is rotated to make the upper sieve holes 632 and the lower sieve holes 634 intertwine or overlap with each other to change the size of the fertilizer particles that can pass through.

[0051] When the upper and lower sieve holes 634 are staggered with each other, only part of the area overlaps, and the size of the fertilizer particles that can pass through is smaller. When the upper and lower sieve holes 634 completely overlap, the size of the fertilizer particles that can pass through is larger. By adjusting the rotation angle of the lower plate 633, partial overlap of the upper and lower sieve holes 634 can be achieved, thereby accurately controlling the size of the fertilizer particles that can pass through.

[0052] A feed pipe 66 connected to the silo 41 is provided on one side of the bottom cover 61, and a feed funnel 661 is provided on the upper end of the feed pipe 66. The large opening design and conical structure of the feed funnel 661 enable the raw materials to be smoothly added to the feed pipe 66, reducing the feeding time and labor intensity.

[0053] By placing the raw materials from the feed funnel 661 into the feed pipe 66, the raw materials enter the silo 41. At this time, the motor drives the drive shaft 3 to rotate, thereby driving the pressure plate 4 to move downward to squeeze the raw materials. After the extrusion is completed, the drive shaft 3 is driven in reverse to transfer the pressure plate 4 to the starting position, and then the raw materials are placed in the silo 41 through the feed pipe 66.

[0054] Reference Figure 9 and Figure 10As shown, a connecting rod 67 is slidably passed through one end of the feed pipe 66, and a piston 671 corresponding to one end of the feed pipe 66 is provided at one end of the connecting rod 67, and a return spring 68 is provided between the end of the connecting rod 67 located outside the feed pipe 66 and the feed pipe 66.

[0055] The return spring 68 will push the connecting rod 67, so that the connecting rod 67 drives the limiting ring 69 provided on it to press against the feed pipe 66, and the piston 671 blocks one end of the feed pipe 66, ensuring that when the pressure plate 4 moves to the feeding end of the feed pipe 66, the raw materials will not fall on the top of the pressure plate 4. When putting the raw materials in, the return spring 68 is compressed by pushing the connecting rod 67, so that the connecting rod 67 drives the piston 671 to move into the silo 41, thereby opening one end of the feed pipe 66 and allowing the raw materials to enter the silo 41.

[0056] After the oversized particles and fine powder fall under the sieve plate 63 , they will be discharged along the guide slope 611 provided at the bottom of the bottom cover 61 . The inclination direction of the guide slope 611 is opposite to that of the sieve plate 63 . Example

[0057] Reference Figure 10 On the basis of the first embodiment, a recovery component 7 is provided on the support cylinder 1. The recovery component 7 will recycle the particles and fine powder that are too small to be screened out, and transport them to the feed funnel 661 again, so that they are stored in the feed funnel 661 and the feed pipe 66, thereby realizing the recovery and reuse of the fine powder and improving the raw material utilization rate and production efficiency.

[0058] Specifically, the recovery part 7 includes a recovery pipe 71. The lower end of the recovery pipe 71 passes through the bottom end of the guide slope 611 in the inclined direction to the bottom cover 61. The upper end of the recovery pipe 71 is connected to the feed funnel 661. A transmission shaft 72 is rotatably provided in the recovery pipe 71. The transmission shaft 72 is provided with a spiral blade 73 located in the recovery pipe 71. The transmission shaft 72 is connected to the drive shaft 3 by belt drive.

[0059] When the driving shaft 3 rotates, it drives the transmission shaft 72 to rotate together through the belt transmission, and the transmission shaft 72 drives the spiral blades 73 to rotate synchronously.

[0060] After the oversized particles and fine powder fall under the sieve plate 63, they will follow the guide slope 611 set at the bottom of the bottom cover 61 into the bottom of the recovery pipe 71, and then the rotating spiral blades 73 will transport the oversized particles and fine powder upward, so that the fine powder and the like will enter the feed funnel 661 for storage again, and will enter the silo 41 together with the raw materials next time. This not only reduces waste, but also provides a guarantee for high-quality and high-efficiency production.

[0061] Finally, the present invention also provides a rotary cutting high tower granulation method for fertilizer preparation, and the method of using the method comprises the following steps: S1: Granulation preparation. When granulating the fertilizer, the raw materials are put into the feed pipe 66 from the feed funnel 661, and the raw materials enter the silo 41. At the same time, by rotating the limit screw 56, the limit on the sealing plate 54 is released through threaded engagement, and then the slice 55 is moved to move the sealing plate 54 in the slide groove 53, thereby changing the size of the discharge port 52. The movement of the sealing plate 54 directly affects the opening area of ​​the discharge port 52; when the sealing plate 54 moves toward the discharge port 52, the discharge port 52 becomes larger, and the material strips can be discharged faster; on the contrary, when the sealing plate 54 moves in the opposite direction, the discharge port 52 becomes smaller, and the discharge speed of the material strips slows down.

[0062] S2: Extrusion granulation, the driving shaft 3 is driven by the motor to rotate, and the rotating driving shaft 3 will drive the turntable 2 connected to its lower end to rotate synchronously. At the same time, the pressing plate 4 moves downward through the threaded connection with the driving shaft 3, reducing the space in the hopper 41 and thus pushing the raw material downward. The raw material is compressed and extruded from a number of pressing holes 21 opened on the turntable 2, and the several pressing holes 21 are distributed in a matrix. The raw material can be evenly distributed during the extrusion process to form a continuous material strip.

[0063] S3: Continuous granulation. As the turntable 2 rotates, the material strips are continuously squeezed out from the pressing hole 21 and contact the slices 55 on the sealing plate 54. The relative movement between the slices 55 and the turntable 2 cuts the material strips and cuts them into uniform fertilizer particles. The cutting process is continuous. As the turntable 2 rotates continuously, new material strips are continuously squeezed out and cut.

[0064] S4: Granulation and screening. After the fertilizer particles are cut, they fall onto the sieve plate 63. Due to the inclined setting of the sieve plate 63, smaller fertilizer particles and fine powder will pass through the sieve holes on the sieve plate 63 and fall into the bottom of the bottom cover 61. These materials are separated because their sizes do not meet the requirements. Fertilizer particles of qualified size cannot pass through the sieve plate 63 because their sizes are larger than the size of the sieve holes. Instead, they move along the inclined direction of the sieve plate 63. Qualified fertilizer particles move along the inclined direction of the sieve plate 63 and are finally discharged from the discharge port 62 on the bottom cover 61.

[0065] S5: Recycling and remaking. After the oversized particles and fine powder fall under the screen plate 63, they will follow the guide slope 611 set at the bottom of the bottom cover 61 into the bottom of the recovery pipe 71, and then the rotating spiral blades 73 will transport the oversized particles and fine powder upward, so that the fine powder and the like will enter the feed funnel 661 for storage again, and will enter the silo 41 together with the raw materials next time.

[0066] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotary cutting high tower granulator for fertilizer preparation, comprising a support cylinder (1), wherein a turntable (2) is rotatably provided at the lower end of the support cylinder (1), characterized in that: A driving shaft (3) is rotatably provided on the support cylinder (1), the lower end of the driving shaft (3) is connected to the turntable (2), a pressing plate (4) is slidably provided in the support cylinder (1), the pressing plate (4) is threadedly connected to the driving shaft (3), a material bin (41) is formed between the pressing plate (4) and the turntable (2), a plurality of pressing holes (21) distributed in a matrix are provided on the turntable (2), and a rotary cutter (5) is provided at the bottom of the support cylinder (1); The rotary cutter (5) comprises a cutting disc (51) arranged at the bottom of the support cylinder (1) and located at the lower end of the rotary disc (2); a discharge port (52) is provided on the cutting disc (51); a chute (53) is provided on one side of the discharge port (52); a sealing plate (54) is slidably provided in the chute (53); and the sealing plate (54) is fan-shaped and corresponds to the discharge port (52).

2. A rotary cutting high tower granulator for fertilizer preparation according to claim 1, characterized in that: A slice (55) is provided at one end of the sealing plate (54), and the slice (55) contacts the turntable (2). A limiting screw (56) is rotatably provided on the turntable (2), and the limiting screw (56) corresponds to the sealing plate (54). The limiting screw (56) is pressed against the sealing plate (54) to limit the position.

3. The rotary cutting high tower granulator for fertilizer preparation according to claim 1, characterized in that: A screener (6) is provided at the lower end of the support cylinder (1); The screener (6) includes a bottom cover (61) provided at the lower end of the support cylinder (1), a screen plate (63) provided in the bottom cover (61), and the screen plate (63) is inclined on the bottom cover (61), and a discharge port (62) is provided on the bottom cover (61), and the discharge port (62) is located at the bottom end of the inclined direction of the screen plate (63).

4. The rotary cutting high tower granulator for fertilizer preparation according to claim 3, characterized in that: The sieve plate (63) includes an upper plate (631) disposed in the bottom cover (61), the upper plate (631) having upper sieve holes (632) formed thereon, a lower plate (633) rotatably disposed on the upper plate (631), and the lower plate (633) having lower sieve holes (634) corresponding to the sieve holes formed thereon; A pin rod (64) is rotatably provided on the upper plate (631) and is threadably connected thereto, and the pin rod (64) corresponds to the lower plate (633).

5. The rotary cutting high tower granulator for fertilizer preparation according to claim 3, characterized in that: The sieve plate (63) is slidably arranged in the bottom cover (61), and the drive shaft (3) rotates and penetrates the sieve plate (63). The drive shaft (3) is provided with a reciprocating thread groove (65) that is threadably matched with the sieve plate (63).

6. The rotary cutting high tower granulator for fertilizer preparation according to claim 1, characterized in that: A feed pipe (66) communicating with the silo (41) is provided on one side of the bottom cover (61), and a feed funnel (661) is provided at the upper end of the feed pipe (66).

7. The rotary cutting high tower granulator for fertilizer preparation according to claim 6, characterized in that: A connecting rod (67) is slidably passed through one end of the feed pipe (66), a piston (671) corresponding to one end of the feed pipe (66) is provided at one end of the connecting rod (67), and a return spring (68) is provided between the end of the connecting rod (67) located outside the feed pipe (66) and the feed pipe (66).

8. The rotary cutting high tower granulator for fertilizer preparation according to claim 7, characterized in that: The connecting rod (67) is provided with a limiting ring (69) located inside the feed pipe (66).

9. The rotary cutting high tower granulator for fertilizer preparation according to claim 3, characterized in that: A guiding slope (611) is provided at the bottom of the bottom cover (61).

10. A rotary cutting high tower granulation method for fertilizer preparation, using the rotary cutting high tower granulator for fertilizer preparation according to any one of claims 1 to 9, characterized in that: The method of use includes the following steps: S1: Granulation preparation, when granulating the fertilizer, the raw materials are put into the feed pipe (66) from the feed funnel (661), and the raw materials enter the silo (41); S2: extrusion granulation, the driving shaft (3) is driven by a motor to rotate, and the rotating driving shaft (3) drives the turntable (2) connected to its lower end to rotate synchronously, and at the same time the pressing plate (4) moves downward through the threaded connection with the driving shaft (3), reducing the space of the hopper (41) and pushing the raw material downward, and the raw material is squeezed out by the pressing hole (21). The raw material is evenly distributed during the extrusion process to form a continuous material strip; S3: Continuous granulation: As the turntable (2) rotates, the material strips are continuously extruded from the pressing hole (21) and contact the slices (55) on the sealing plate (54). The relative movement of the slices (55) and the turntable (2) cuts the material strips into uniform fertilizer granules. S4: Granulation and screening. After the fertilizer particles are cut off, they fall on the sieve plate (63). Due to the inclined setting of the sieve plate (63), smaller fertilizer particles and fine powder will pass through the sieve holes on the sieve plate (63) and fall into the bottom of the bottom cover (61).

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