Fertilizer granulation method

Abstract

The invention discloses a fertilizer granulation method. The fertilizer granulation method comprises the following steps: S1, crushing various qualified raw materials; s2, feeding and mixing the crushed raw materials; s3, atomizing and humidifying the mixed raw materials; s4, the humidified raw materials are poured into granulation equipment; s5, the raw materials are extruded by the granulation equipment, and granulation is started after extrusion is completed; s6, the granules are dried while granulation is carried out; s7, raw material disintegrating slag and particles are screened; and S8, delivery and packaging of the granules. When the fertilizer granulation method is used, loose raw materials can be made into spherical particles, the particles after granulation are high in hardness and not prone to loosening, in addition, disintegrating slag and the particles are easy to screen, and the fertilizer granulation method is suitable for application and popularization.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizer granulation, in particular to a fertilizer granulation method. Background Art

[0002] Fertilizer granulation is an important link in agricultural production. The purpose of fertilizer granulation is to improve the physical and chemical properties of fertilizers, which has the following benefits: 1. Improve the physical properties of the product and reduce the hazards such as moisture absorption, caking and dusting generated during the sales and distribution process; 2. Granular fertilizers are suitable for machine fertilization to improve fertilization efficiency; 3. Fertilizer granulation can mix a variety of raw materials together to make fertilizer granules have a variety of nutrients and help simplify fertilization operations; 4. Compared with fertilizer, granular fertilizers can slow down the nutrient dissolution rate, thereby reducing the damage of chemical components to seeds or seedlings.

[0003] The utility model patent with announcement number CN212119920U discloses a granulator for fertilizer production with adjustable particle size, including an extruder body, on the upper end surface of which a mounting box and two motors distributed in parallel are fixedly installed from left to right, two pressing rollers are installed inside the mounting box, the outer sides of the two pressing rollers are fixedly connected with a plurality of fixed blocks, the outer side walls of the plurality of fixed blocks are provided with grooves, the outer side walls of the two pressing rollers are installed with replacement layers, the inner walls of the two replacement layers are fixedly connected with a plurality of embedded strips matching the grooves, and the outer side walls of the two replacement layers are provided with a plurality of evenly distributed circular depressions; the technical problem that the size of granulated particles cannot be adjusted is solved.

[0004] However, in the actual granulation process, the above granulator cannot extrude the raw materials in sections when in use, and the produced granules are uneven. In addition, after granulation, the granules have poor surface hardness, are easy to crack and loosen, and the use effect is not ideal. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems and provide a fertilizer granulation method which can make loose raw materials into spherical particles, and the particles after granulation have high hardness and are not easy to loosen, and the crushed residues and particles are also easy to screen.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a fertilizer granulation method, comprising the following steps: S1: crushing a variety of raw materials of qualified quality; S2: mixing the crushed raw materials; S3: atomizing and humidifying the mixed raw materials; S4: pouring the humidified raw materials into a granulation device; S5: the granulation device first extrude the raw materials, and then starts granulation after the extrusion is completed; S6: drying the granules while granulating; S7: screening the raw material residues and granules; S8: packaging the granules for delivery.

[0007] Preferably, the granulation equipment is provided with two shaping rollers and two granulating rollers, and the two granulating rollers are correspondingly arranged directly below the shaping roller, and the circumference of the shaping roller is provided with a plurality of strip-shaped semicircular grooves along its own length direction, and the raw material bulk is extruded into columnar material through the strip-shaped semicircular grooves on the circumference of the two shaping rollers, and the circumference of the granulating roller is evenly provided with a plurality of annular semicircular grooves, and the columnar material is extruded into spherical granular material through the annular semicircular grooves on the circumference of the two granulating rollers.

[0008] Preferably, the inner diameter of the strip-shaped semicircular groove is consistent with the inner diameter of the annular semicircular groove.

[0009] Preferably, a horizontally arranged partition is provided between the shaping roller and the granulating roller, a channel for the columnar material to pass through is provided in the middle of the partition, and upwardly extending limit plates are provided on both sides of the channel, and the inner side of the limit plates is arc-shaped.

[0010] Preferably, a feed port is provided on the top of the granulation equipment, and the feed port is located just above between two shaping rollers, and a discharge port is provided on one side of the granulation equipment.

[0011] Preferably, an electric heating wire is provided inside the granulation roller, and the electric heating wire is wound around the circumference of the granulation roller in a spring shape, and a connecting line of the electric heating wire extends to the outside of the granulation equipment.

[0012] Preferably, a drive box is provided on the outside of the granulation equipment, and a drive mechanism for driving the shaping roller and the granulation roller to rotate is provided in the drive box, and the drive mechanism includes four first pulleys, and the four first pulleys are respectively transmitted to the shaping roller and the granulation roller, and the two first pulleys on the same side are connected by a first belt, and each first belt drives the shaping roller and the granulation roller on the same side respectively, and the two lower first pulleys are provided with a gear shaft cylinder, and two motor covers are provided on the outside of the drive box, and a stepper motor is provided in the motor cover, and the two stepper motors respectively drive the two second belts to rotate.

[0013] Preferably, a screening frame is further provided in the granulation equipment, and the screening frame is located below the granulation roller. The screening frame is inclined toward the discharge port, and the surface of the screening frame is provided with through holes and one side is provided with an opening. The screening frame is hinged to the inner wall of the granulation equipment through hinge shafts on both sides of the opening, and an elastic telescopic rod is provided on the other side of the screening frame, one end of the elastic telescopic rod is fixed to the screening frame, and the other end is in contact with a support plate, and the support plate is fixed to the inner wall of the granulation equipment.

[0014] Preferably, a second pulley is provided on the circumference of one of the gear shaft cylinders, a third pulley is provided on the outer side of the granulating equipment, the second pulley and the third pulley are connected by a second belt, a camshaft is provided on the inner side of the third pulley, and the camshaft is connected to the bottom of the screening frame when rotating.

[0015] Preferably, a power box is provided on one side of the granulation equipment, and a conductive cylinder for preventing wire winding is provided in the power box, the connecting wire of the electric heating wire is connected to the external power wire through the conductive cylinder, through holes are provided at both ends of the conductive cylinder, a rotating disk and a conductive disk are provided inside the conductive cylinder, the rotating disk and the conductive disk are arranged in parallel and opposite to each other, the connecting wire passes through one side of the conductive cylinder and is fixedly connected to the rotating disk, the rotating disk is provided with a hemispherical conductive protrusion on the side away from the connecting wire, one side of the conductive disk is provided with an annular groove corresponding to the conductive protrusion, and the other side is fixedly connected to the power cord, a plurality of insulating springs are provided around the end of the power cord, one end of the insulating spring is fixedly connected to the inner wall of the conductive cylinder, and the other end is fixedly connected to the conductive disk, the insulating spring pushes the conductive disk to contact the rotating disk; the rotating disk and the conductive disk are both conductors, and the conductive cylinder is an insulator.

[0016] The invention discloses a fertilizer granulation method, comprising the following steps: S1: crushing a plurality of raw materials of qualified quality; S2: feeding and mixing the crushed raw materials; S3: atomizing and humidifying the mixed raw materials; S4: pouring the humidified raw materials into a granulation device; S5: the granulation device first squeezes the raw materials, and starts granulation after the extrusion is completed; S6: drying the particles while granulating; S7: screening the raw material residues and particles; S8: packaging the particles for delivery. Compared with the prior art, the fertilizer granulation method has the beneficial effects of being able to make spherical particles from loose raw materials when in use, and the particles after granulation have high hardness and are not easy to loosen, and the residues and particles are also easy to screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall structure of the granulation equipment in the fertilizer granulation method of the present invention is shown in FIG. Figure 1 .

[0018] Figure 2 The overall structure of the granulation equipment in the fertilizer granulation method of the present invention is shown in FIG. Figure 2 .

[0019] Figure 3 Schematic diagram of the internal structure of a granulation device in a fertilizer granulation method of the present invention Figure 1 .

[0020] Figure 4 Schematic diagram of the internal structure of a granulation device in a fertilizer granulation method of the present invention Figure 2 .

[0021] Figure 5 Schematic diagram of the internal structure of a granulation device in a fertilizer granulation method of the present invention Figure 3 .

[0022] Figure 6 For the present invention Figure 4Schematic diagram of the enlarged structure at point A in the middle.

[0023] Figure 7 The granulation principle of the granulation equipment in the present invention is shown in FIG. Figure 1 .

[0024] Figure 8 The granulation principle of the granulation equipment in the present invention is shown in FIG. Figure 2 .

[0025] Fig. 9 The internal structure of the power box in the present invention is shown in FIG. Figure 1 .

[0026] Fig.10 The internal structure of the power box in the present invention is shown in FIG. Figure 2 .

[0027] Fig.11 It is a schematic diagram of the use status of the power box in the present invention.

[0028] In the figure: 1. granulation equipment; 2. feed inlet; 3. drive box; 31. first pulley; 32. first belt; 33. second pulley; 34. gear shaft cylinder; 35. third pulley; 36. second belt; 4. motor cover; 5. discharge port; 6. shaping roller; 61. strip semicircular groove; 7. granulation roller; 71. annular semicircular groove; 72. electric heating wire; 8. partition; 81. channel; 82. limit plate; 9. screening frame; 91. through hole; 92. opening; 93. hinge shaft; 94. elastic telescopic rod; 95. camshaft; 96. support plate; 10. power box; 101. conductive cylinder; 102. rotating disk; 103. conductive disk; 104. conductive protrusion; 105. annular groove; 106. insulating spring; 11. connecting wire; 12. power cord. DETAILED DESCRIPTION

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.

[0030] A fertilizer granulation method comprises the following steps: S1: crushing a plurality of raw materials of qualified quality; S2: mixing the crushed raw materials; S3: atomizing and humidifying the mixed raw materials; S4: pouring the humidified raw materials into a granulation device; S5: the granulation device first extrude the raw materials, and then starts granulation after the extrusion is completed; S6: drying the granules while granulating; S7: screening the raw material residues and granules; S8: packaging the granules for delivery.

[0031] Please refer to Figure 1-8The granulating equipment 1 is provided with two shaping rollers 6 and two granulating rollers 7. The two granulating rollers 7 are correspondingly arranged directly below the shaping roller 6. The circumference of the shaping roller 6 is provided with a plurality of strip semicircular grooves 61 along its length direction. The raw material bulk is extruded into columnar material through the strip semicircular grooves on the circumference of the two shaping rollers 6. The circumference of the granulating roller 7 is evenly provided with a plurality of annular semicircular grooves 71. The columnar material is extruded into spherical granular material through the annular semicircular grooves 71 on the circumference of the two granulating rollers 71.

[0032] The inner diameter of the strip semicircular groove 61 is consistent with the inner diameter of the annular semicircular groove 71 , and the setting direction of the annular semicircular groove 71 is perpendicular to the strip semicircular groove 61 , and the annular semicircular grooves 71 on the two granulating rollers 7 correspond to each other.

[0033] like Figure 7-8 As shown, in step S3, the bulk material is atomized and humidified to have a certain humidity, which facilitates better shaping during extrusion; when the humidified bulk material passes between the two shaping rollers 6, the strip-shaped semicircular grooves 61 on the two shaping rollers 6 extrude the bulk material into a cylindrical columnar material, and the columnar material is in a long strip shape. Then the long columnar fertilizer goes down between the two granulating rollers 8. Since the annular semicircular grooves 71 on the two granulating rollers 7 correspond one to one, the annular semicircular grooves 71 cut off the columnar material and extrude it further. At this time, the columnar material passes through the annular semicircular grooves 71 to form spherical particles, thereby completing granulation.

[0034] In this embodiment, a horizontally arranged partition 8 is provided between the shaping roller 6 and the granulating roller 7, and a channel 81 for the columnar material to pass through is provided in the middle of the partition 8, and limiting plates 82 extending upward and / or downward are provided on both sides of the channel 81, and the inner side of the limiting plates 82 is arc-shaped; wherein the length of the channel 81 is greater than the length of the shaping roller 6, and the purpose of setting the channel 81 is to allow the columnar material to smoothly enter the granulating roller 7 below, and at the same time, the establishment of the limiting plates 82 can prevent the columnar material from deviating forwards and backwards.

[0035] A feed 2 is provided above the granulation equipment 1, and the feed port 2 is located just above two shaping rollers 6. A discharge port 5 is provided on one side of the granulation equipment 1. When in use, the bulk material only needs to be poured into the feed port 2. After pouring, the bulk material passes through two shaping rollers 6, a partition plate 8 and two granulation tubes 7 to realize bulk material granulation.

[0036] During the granulation process, since the bulk material is atomized and humidified and carries a certain amount of moisture, this step helps the bulk material to be formed, but it may also be prone to cracking or breaking; therefore, it is necessary to heat and dry the spherical particles during granulation so that the dried spherical particles have a certain hardness to avoid the generation of broken materials and waste; specifically, an electric heating wire 72 is provided inside the granulation roller 7, and the electric heating wire 72 is spring-shaped and wound around the circumference of the granulation roller 7, and the annular semicircular groove 71 is provided at the outermost part to shield the electric heating wire 72, and the connecting line 11 of the electric heating wire 72 extends to the outside of the granulation equipment 1.

[0037] During the granulation process, the electric heating wire 72 is connected to an external power source, and the operation of the electric heating wire 72 causes the circumference of the granulation roller 7 (the annular semicircular groove 71) to heat up; when the columnar material is extruded and granulated, the spherical material is subjected to the temperature in the annular semicircular groove 71 during the molding process, and the two annular semicircular grooves 71 cover the spherical particles, causing the water carried by the spherical particles to evaporate quickly. After evaporation, a dry surface layer is formed on the surface of the spherical particles, which has a certain hardness, thereby preventing it from scattering and cracking, thereby improving the granulation molding effect.

[0038] Please refer again Figure 4 In this embodiment, a driving box 3 is provided outside the granulation equipment 1, and a driving mechanism for driving the shaping roller 6 and the granulation roller 7 to rotate is provided inside the driving box 3, and the driving mechanism includes four first pulleys 31, and the four first pulleys 31 are respectively transmitted correspondingly to the shaping roller 6 and the granulation roller 7, that is, the outer sides of the ends of the two shaping rollers 6 and the two granulation rollers 7 are respectively provided with first pulleys 6, and the two first pulleys 31 on the same side are connected by a first belt 32, that is, the shaping roller 6 and the granulation roller 7 on the same side are connected by a first belt 32, and each first belt 32 drives the shaping roller 6 and the granulation roller 7 on the same side to rotate respectively, and a gear shaft cylinder 34 is provided on the two first pulleys 31 below, and two motor covers 4 are provided outside the driving box 3, and a stepping motor is provided inside the motor cover 4, and the output end of the stepping motor is provided with a gear shaft matched with the gear shaft cylinder 34, and the two stepping motors respectively drive the two second belts 32 to rotate.

[0039] The two stepper motors have the same frequency and speed, and opposite directions (one rotates clockwise and the other rotates counterclockwise), driving the two shaping rollers 6 and the two granulation rollers 7 to rotate inwards to meet the granulation requirements; in addition, the consistency of frequency and speed is to ensure that the strip semicircular grooves 61 on the two shaping rollers 6 are in step with each other, and the two strip semicircular grooves 61 can form a circular cavity during the rotation process. In other words, the two stepper motors are started and stopped at the same time, in order to make the two strip semicircular grooves 61 interlock and extrude.

[0040] In this embodiment, the columnar material will form spherical particles after passing through two granulation rollers 7, and a small amount of debris will be generated. In order to screen the debris and spherical particles, a screening frame 9 is further provided in the granulation equipment 1. The screening frame 9 is located below the granulation roller 7. The screening frame 9 is inclined toward the discharge port 5. The surface of the screening frame 9 is provided with a through hole 91 and one side is provided with an opening 92, wherein the inner diameter of the through hole 91 is smaller than the inner diameter of the annular semicircular groove 71, and the screening frame 9 is hinged to the inner wall of the granulation equipment 1 through a hinge shaft 93 on both sides of the opening 92, and an elastic telescopic rod 94 is provided on the other side of the screening frame 9, one end of the elastic telescopic rod 94 is fixed on the screening frame 9, and the other end is in contact with a support plate 96, and the support plate 96 is fixed to the inner wall of the granulation equipment 1.

[0041] Since both sides of one end of the screening frame 9 are hinged to the inner wall of the granulation equipment 1 through the hinge shaft 93, the end without the hinge shaft 93 can be tilted upward, so that the screening frame 9 is further inclined toward the discharge port 5, which is conducive to the discharge of spherical particles; and the debris produced by granulation will be discharged from the through hole 91, realizing the screening of debris and spherical particles.

[0042] In order to further improve the screening efficiency, a second pulley 33 is provided on the circumference of one of the gear shaft cylinders 34, a third pulley 35 is provided on the outer side of the granulating equipment 1, the second pulley 33 and the third pulley 35 are connected by a second belt connection 36, a camshaft 95 is provided on the inner side of the third pulley 35, and the camshaft 95 is connected to the bottom of the screening frame 9 when rotating.

[0043] The gear shaft cylinder 34 is driven to rotate by a stepper motor, so when the gear shaft cylinder 34 rotates, the second pulley 33 will also start to rotate. At this time, the second pulley 33 drives the third pulley 35 to rotate through the second belt 36. When the third pulley 35 rotates, the inner camshaft 95 will rotate accordingly.

[0044] The rotation of the camshaft 95 will continuously vibrate the screening frame 9, and the screening frame 9 will be continuously shocked, which is helpful for screening and discharging materials and improving the use efficiency.

[0045] Based on the above embodiment, the connecting wire 11 of the electric heating wire 72 in the present invention extends outward and is connected to an external power supply. During the granulation process, the granulation roller 7 is continuously rotating, so the connecting wire 11 will rotate accordingly, which will cause the wire to be entangled. Long-term winding will not only cause knots, but also accelerate line aging and cause accidents.

[0046] In order to avoid the above phenomenon, a power box 10 is provided on one side of the granulation device 1. For details, please refer to Figure 9-10The power box 10 is provided with a conductive tube 101 to prevent winding. The connecting wire 11 of the electric heating wire 72 is connected to the external power line 12 through the conductive tube 101. Through holes are provided at both ends of the conductive tube 101 to facilitate the passage of the connecting wire and the power line.

[0047] A rotating disk 102 and a conductive disk 103 are provided inside the conductive cylinder 101. The rotating disk 102 and the conductive disk 103 are arranged in parallel and opposite to each other. The rotating disk 102 can rotate in the conductive cylinder 101 through a bearing. The connecting wire 11 passes through one side of the conductive cylinder 101 and is fixedly connected to the rotating disk 102. The rotating disk 102 is provided with a hemispherical conductive protrusion 104 on the side away from the connecting wire 11. One side of the conductive disk 103 is provided with an annular groove 105 corresponding to the conductive protrusion 104, and the other side is fixedly connected to the power line 12. A plurality of insulating springs 106 are provided around the end of the power line 12. One end of the insulating spring 106 is fixedly connected to the inner wall of the conductive cylinder 101, and the other end is fixedly connected to the conductive disk 103. The insulating spring 106 pushes the conductive disk 103 to contact the rotating disk 102.

[0048] That is to say, one side of the rotating disk 102 is provided with a conductive protrusion 104 and can rotate in the conductive cylinder 101, but cannot be displaced; one side of the conductive disk 103 can cooperate with the conductive protrusion 104 on the rotating disk 102 through the annular groove 105, and the other side can be pushed by the insulating spring 106, so that the rotating disk 102 and the conductive disk 103 are in close contact.

[0049] like Fig.11 As shown, under the push of the insulating spring 106, the rotating disk 102 and the conductive disk 103 will always be in contact to achieve conductivity, and when the rotating disk 102 rotates, the conductive protrusion 104 will rotate in the annular groove 105, and the two will always be in contact.

[0050] At this time, the connecting wire 11 is connected to the power line 12 through the rotating disk 102, the conductive protrusion 104, and the conductive disk 103 to achieve smooth circuit; since the connecting wire 11 of the electric heating wire is fixedly connected to the rotating disk 102, when the electric heating wire 72 and the connecting wire 11 rotate, the rotating disk 102 will rotate accordingly; and the electricity is uninterrupted during the rotation process, and the winding phenomenon of the connecting wire 11 is avoided, which makes it safer and more reliable to use.

[0051] The rotating disk 102 and the conductive disk 103 are both metal conductors, and the conductive cylinder 101 is an insulator.

[0052] Based on the above embodiment, gears can also be set at the ends of the two shaping rollers 6 and the two granulating rollers 7. The two shaping rollers 6 are meshed by gears, and the two granulating rollers 7 are also meshed by gears. The two sets of gears are driven by an external motor. At this time, the two shaping rollers 6 run synchronously, and the two granulating rollers 7 run synchronously without interfering with each other. When in use, it can be ensured that the strip semicircular grooves on the two shaping rollers 6 correspond to each other, and synchronous operation can also be ensured, which helps to improve transmission efficiency and granulation quality.

[0053] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A fertilizer granulation method, characterized in that: The method comprises the following steps: S1: crushing various raw materials of qualified quality; S2: mixing the crushed raw materials; S3: atomizing and humidifying the mixed raw materials; S4: pouring the humidified raw materials into the granulation equipment; S5: the granulation equipment first extrude the raw materials, and then starts granulation after the extrusion is completed; S6: drying the granules while granulating; S7: screening the raw material residue and granules; S8: packaging the granules for shipment.

2. The fertilizer granulation method according to claim 1, characterized in that: The granulating equipment is provided with two shaping rollers and two granulating rollers. The two granulating rollers are correspondingly arranged directly below the shaping roller. The circumference of the shaping roller is provided with a plurality of strip-shaped semicircular grooves along its length direction. The raw material bulk is extruded into columnar material through the strip-shaped semicircular grooves on the circumference of the two shaping rollers. The circumference of the granulating roller is evenly provided with a plurality of annular semicircular grooves. The columnar material is extruded into spherical granular material through the annular semicircular grooves on the circumference of the two granulating rollers.

3. The fertilizer granulation method according to claim 2, characterized in that: The inner diameter of the strip-shaped semicircular groove is consistent with the inner diameter of the annular semicircular groove.

4. The fertilizer granulation method according to claim 3, characterized in that: A horizontally arranged partition is provided between the shaping roller and the granulating roller, a channel for the columnar material to pass through is provided in the middle of the partition, and upwardly extending limit plates are provided on both sides of the channel, and the inner sides of the limit plates are arc-shaped.

5. The fertilizer granulation method according to claim 4, characterized in that: A feed port is arranged above the granulating device, and the feed port is located just above between two shaping rollers. A discharge port is arranged at one side of the granulating device.

6. The fertilizer granulation method according to claim 5, characterized in that: An electric heating wire is arranged inside the granulation roller. The electric heating wire is wound around the circumference of the granulation roller in a spring shape, and a connecting line of the electric heating wire extends to the outside of the granulation equipment.

7. The fertilizer granulation method according to any one of claims 2 to 6, characterized in that: A drive box is provided on the outside of the granulation equipment, and a drive mechanism for driving the shaping roller and the granulation roller to rotate is provided in the drive box. The drive mechanism includes four first pulleys, and the four first pulleys are respectively driven correspondingly to the shaping roller and the granulation roller. The two first pulleys on the same side are connected by a first belt, and each first belt drives the shaping roller and the granulation roller on the same side respectively. A gear shaft cylinder is provided on the two lower first pulleys, and two motor covers are provided on the outside of the drive box. A stepper motor is provided in the motor cover, and the two stepper motors respectively drive the two second belts to rotate.

8. The fertilizer granulation method according to claim 7, characterized in that: A screening frame is also provided in the granulation equipment. The screening frame is located below the granulation roller. The screening frame is inclined toward the discharge port. A through hole is provided on the surface of the screening frame and an opening is provided on one side. The screening frame is hinged to the inner wall of the granulation equipment through a hinge shaft on both sides of the opening. An elastic telescopic rod is provided on the other side of the screening frame. One end of the elastic telescopic rod is fixed to the screening frame, and the other end is in contact with a support plate. The support plate is fixed to the inner wall of the granulation equipment.

9. The fertilizer granulation method according to claim 8, characterized in that: A second pulley is provided on the circumference of one of the gear shaft cylinders, a third pulley is provided on the outer side of the granulating device, the second pulley and the third pulley are connected by a second belt, a cam shaft is provided on the inner side of the third pulley, and the cam shaft is connected to the bottom of the screening frame when rotating.

10. The fertilizer granulation method according to claim 6, characterized in that: A power box is provided on one side of the granulating equipment, and a conductive cylinder for preventing wire winding is provided in the power box. The connecting wire of the electric heating wire is connected to the external power wire through the conductive cylinder. Through holes are provided at both ends of the conductive cylinder. A rotating disk and a conductive disk are provided inside the conductive cylinder. The rotating disk and the conductive disk are arranged in parallel and opposite to each other. The connecting wire passes through one side of the conductive cylinder and is fixedly connected to the rotating disk. The rotating disk is provided with a hemispherical conductive protrusion on the side away from the connecting wire, and an annular groove corresponding to the conductive protrusion is provided on one side of the conductive disk, and the other side is fixedly connected to the power line. A plurality of insulating springs are provided around the end of the power line, one end of the insulating spring is fixedly connected to the inner wall of the conductive cylinder, and the other end is fixedly connected to the conductive disk, and the insulating spring pushes the conductive disk to contact the rotating disk; the rotating disk and the conductive disk are both conductors, and the conductive cylinder is an insulator.

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