Fertilizer production system and production process thereof

Abstract

The fertilizer production system comprises a material mixing machine, an auger conveyor, a lifting hopper, a double-roller extrusion pelletizer, a screening machine, a belt conveying mechanism, a finished product bin and a weighing and packaging machine, the double-roller extrusion pelletizer comprises a pelletizer body, extrusion rollers are arranged in the pelletizer body, extrusion grooves are formed in the extrusion rollers, and the belt conveying mechanism is arranged in the pelletizer body. A feeding hopper is arranged on the granulator body, a first conveying belt is arranged in the granulator body, a second conveying belt is arranged on one side of the first conveying belt, a third conveying belt is arranged below the second conveying belt, the first conveying belt and the second conveying belt synchronously and reversely rotate, and the rotating speed of the second conveying belt is lower than that of the third conveying belt. The first conveying belt, the second conveying belt and the third conveying belt are each provided with a plurality of annular pill rolling grooves with semicircular sections. And the original waste materials during scattering and separation can be effectively reduced. And meanwhile, the generation of dust is reduced, the subsequent working procedures of the spheroidizing machine are reduced, the cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fertilizer production, and in particular relates to a fertilizer production system and a production process thereof. Background Art

[0002] Fertilizer production is an important pillar of agricultural development. Fertilizer is a substance that provides essential nutrients for plants, improves soil properties, and increases soil fertility. It is also an indispensable means of production in agricultural production.

[0003] When producing existing fertilizers, various raw materials are first fully mixed and then extruded and granulated. The inventors have found that when extruding and granulating existing fertilizers, they are all granulated by a double-roll extrusion granulator. The existing double-roll extrusion granulator first extrude the fertilizer into a cake shape with multiple protrusions on the surface through the synchronous reverse rotation of two extrusion rollers, and then the fertilizer is broken into independent particles by the stirring and breaking mechanism below. Although this method can quickly separate and shape the particles, the stirring and breaking mechanism can easily break some T-shaped fertilizer particles while breaking them, thereby generating more waste. At the same time, it is also easy to generate a certain amount of dust during the breaking process.

[0004] At the same time, the existing double-roll extrusion granulator breaks up the formed particles. Due to the characteristics of the extrusion roller, most of the formed particles are oblate spherical, and the annular edges of the formed particles have a certain amount of raised fertilizers that are not completely separated. Therefore, after the double-roll extrusion granulator is formed, it is necessary to use a rounding machine again to make the particles as spherical as possible, which makes the processing technology cumbersome and increases the cost.

[0005] Therefore, the existing structure and deficiencies are studied and improved, and a fertilizer production system and production process thereof are provided, in order to achieve a more practical purpose. Summary of the invention

[0006] In view of at least one problem in the prior art, an object of the present invention is to provide a fertilizer production system and a production process thereof.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A fertilizer production system, including a material mixer, an auger conveyor, a lifting hopper, a roller extrusion granulator, a screening machine, a belt conveyor mechanism, a finished product bin and a weighing and packaging machine, wherein the material mixer, the auger conveyor, the lifting hopper, the roller extrusion granulator, the screening machine, the belt conveyor mechanism, the finished product bin and the weighing and packaging machine are connected end to end in sequence, the roller extrusion granulator includes a granulator body, two extrusion rollers rotating synchronously in the opposite direction are arranged in the granulator body, the extrusion rollers are each provided with a plurality of evenly distributed extrusion grooves, and the granulator located above the extrusion rollers A feed hopper is provided on the main body, and a vertical and rotatable first conveyor belt is provided in the granulator main body located below the extrusion roller, a second conveyor belt is provided on one side of the first conveyor belt, and a third conveyor belt is provided below the second conveyor belt. The first conveyor belt and the second conveyor belt rotate synchronously in opposite directions, and the rotation speed of the second conveyor belt is lower than that of the third conveyor belt. The first conveyor belt, the second conveyor belt and the third conveyor belt are all provided with a plurality of annular pill rolling grooves with semicircular cross-sections, and the rotation speed of the first conveyor belt is the same as the speed at which the material descends from the extrusion roller.

[0009] Preferably, it also includes a dust removal system, wherein the air inlet end of the dust removal system is connected to the lifting hopper, the double-roller extrusion granulator and the dust collecting hood above the screening machine through pipelines.

[0010] Preferably, an auger conveyor is provided at the waste end of the screening machine, and the output end of the auger conveyor is connected to the feed end of the lifting hopper.

[0011] Preferably, a first extrusion plate is provided in the first conveyor belt, and a third extrusion plate is provided in the third conveyor belt. The distance between the first extrusion plate and the second extrusion plate enables the first conveyor belt and the third conveyor belt to be slidably connected.

[0012] Preferably, an inverted "eight" shape is formed between the feed ends of the first conveyor belt and the second conveyor belt, and the material squeezed by the squeezing roller is located between the pill rolling grooves on the first conveyor belt and the second conveyor belt, and the squeezing groove is aligned with the pill rolling groove in the vertical direction.

[0013] Preferably, the first conveyor belt is provided with two rotatable first conveyor shafts for driving the first conveyor belt to rotate, the second conveyor belt is provided with two rotatable second conveyor shafts for driving the second conveyor belt to rotate, and the third conveyor belt is provided with two rotatable third conveyor shafts for driving the third conveyor belt to rotate.

[0014] Preferably, the horizontal distance between the first conveying axis and the second conveying axis at the upper end is greater than the horizontal distance between the first conveying axis and the second conveying axis at the lower end, and the two third conveying axes are vertically aligned with the second conveying axis at the lower end.

[0015] Preferably, the second conveying shaft and the third conveying shaft are both provided with fixedly connected gears, a synchronous chain connected between the gears is provided, and the diameter of the gear on the second conveying shaft is greater than the diameter of the gear on the third conveying shaft.

[0016] Preferably, a discharge hopper is provided below the third conveyor belt, a discharge port is provided on one side of the granulator body, the discharge hopper is connected to the discharge port, and a screening hole is provided on the discharge hopper located directly below the third conveyor belt.

[0017] A fertilizer production process, using the fertilizer production system, comprises the following steps:

[0018] S1 sends the fertilizer raw materials into the material mixer for full and uniform mixing, and then transports them to the lifting hopper via the hinged conveyor, and then sends them to the roller extrusion granulator through the lifting hopper for granulation;

[0019] S2 The material entering the granulation body enters between the extrusion rollers through the feed hopper. Through the extrusion between the extrusion rollers, the material is firmly squeezed into the extrusion groove, so that the material passing through the extrusion roller falls in the shape of a square cake, and the material in the extrusion groove will form multiple evenly distributed protrusions on the front and rear surfaces of the square after extrusion;

[0020] S3 square material falls into the space between the first conveyor belt and the second conveyor belt. Since the first conveyor belt and the second conveyor belt rotate synchronously and the rotation speed of the first conveyor belt and the second conveyor belt is the same as the falling material, the ball rolling grooves on the first conveyor belt and the second conveyor belt can squeeze and fix the protrusions during the movement;

[0021] S4 When the material moves to the third conveyor belt, since the rotation speed of the third conveyor belt is greater than that of the second conveyor belt, the third conveyor belt can roll the extruded protrusions downward, and through the characteristics of friction and the shape of the pill-rolling groove, it can imitate the action of Chinese medicine pill-rolling, so that the protrusions are automatically separated and automatically rolled into a ball shape, and the protrusions that do not enter the third conveyor belt are fixed by the second conveyor belt and the first conveyor belt, so there will be no situation where the material is unevenly stressed and causes large-scale automatic disintegration;

[0022] S5 The formed fertilizer particles are sent to the screen machine for screening, and the fertilizer particles that meet the standards after screening are transported to the finished product warehouse through the belt conveyor;

[0023] S6 sends the fertilizer granules in the finished product warehouse into the weighing and packaging machine, which automatically packages them into shape after weighing, and finally packs them for shipment.

[0024] Compared with the prior art, the present invention has the following technical effects:

[0025] The design of the first conveyor belt, the second conveyor belt and the pill rolling groove can utilize the movement of the first conveyor belt and the second conveyor belt to guide the protrusions on the square cake-shaped material squeezed by the squeezing roller into the corresponding pill rolling grooves respectively, and then squeeze and fix the protrusions through the distance between the first conveyor belt and the second conveyor belt. In this way, when the third conveyor belt drives the protrusions to rotate, the square cake-shaped material will not be unevenly stressed and fall apart due to the downward pulling force, so that the protrusions cannot be neatly arranged to enter the pill rolling groove, and there is no way to roll the protrusions into spherical pills in sequence, thereby ensuring the overall stability;

[0026] Since the protrusions are originally irregular spherical, they are more likely to form a spherical shape under the action of external force. Therefore, the design of the first conveyor belt and the third conveyor belt can make use of the different speeds of the third conveyor belt so that the protrusions that enter the third conveyor belt in sequence will move downward in a rotating state under the action of the third conveyor belt. This movement mode can not only realize the automatic separation of the protrusions, but also automatically wrap the materials on the edge of the protrusions on the surface of the protrusions during separation during the rotation of the protrusions. This design can effectively reduce the waste during the original separation by breaking up. At the same time, it also reduces the generation of dust, reduces the subsequent process of the round polishing machine, reduces costs, and improves production efficiency.

[0027] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0028] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0029] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 The process flow chart provided by the present invention.

[0032] Figure 2This is a schematic diagram of the three-dimensional structure of the double-roll extrusion granulator provided by the present invention.

[0033] Figure 3 This is a schematic diagram of the three-dimensional structure of the squeezing roller, the first conveyor belt and the discharge hopper provided by the present invention.

[0034] Figure 4 This is a schematic diagram of the three-dimensional connection structure of the first conveyor belt, the second conveyor belt and the third conveyor belt provided by the present invention.

[0035] Figure 5 A schematic side view of the structures of the first conveyor belt, the second conveyor belt and the third conveyor belt provided by the present invention.

[0036] Figure 6 This is a schematic diagram of the three-dimensional structure of the third conveyor belt and the pill rolling groove provided by the present invention.

[0037] Figure 7 This is a schematic diagram of the three-dimensional structure of the material after being extruded by the extrusion roller provided by the present invention.

[0038] Explanation of the numbers in the figure: 1. Granulator body; 11. Feed hopper; 12. Extrusion roller; 13. Driving motor; 14. Discharge hopper; 141. Screening hole; 15. First conveyor belt; 151. First extrusion plate; 152. First conveyor shaft; 16. Second conveyor belt; 161. Second extrusion plate; 162. Second conveyor shaft; 17. Third conveyor belt; 171. Third extrusion plate; 172. Third conveyor shaft; 18. Fixed plate; 19. Pill rolling groove. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0040] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] Example 1, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 A fertilizer production system includes a material mixer, an auger conveyor, a lifting hopper, a roller extrusion granulator, a screening machine, a belt conveyor mechanism, a finished product bin and a weighing and packaging machine. The material mixer, the auger conveyor, the lifting hopper, the roller extrusion granulator, the screening machine, the belt conveyor mechanism, the finished product bin and the weighing and packaging machine are connected end to end in sequence. The roller extrusion granulator includes a granulator body 1, in which two synchronously counter-rotating extrusion rollers 12 are arranged, and the extrusion rollers 12 are each provided with a plurality of evenly distributed extrusion grooves. A feed hopper 11 is provided on the granulator body 1 above the extrusion rollers 12, and a feed hopper 12 is provided on the granulator body 1 above the extrusion rollers 12. A vertical and rotatable first conveyor belt 15 is provided in the granulator body 1 below the squeezing roller 12, a second conveyor belt 16 is provided on one side of the first conveyor belt 15, a third conveyor belt 17 is provided below the second conveyor belt 16, the first conveyor belt 15 and the second conveyor belt 16 rotate synchronously in opposite directions, the rotation speed of the second conveyor belt 16 is lower than the rotation speed of the third conveyor belt 17, the first conveyor belt 15, the second conveyor belt 16 and the third conveyor belt 17 are all provided with a plurality of annular and semicircular pill rolling grooves 19, and the rotation speed of the first conveyor belt 15 is the same as the speed at which the material descends from the squeezing roller 12. Wherein, a driving motor 13 for driving the squeezing roller 12 to rotate synchronously in opposite directions is provided in the granulator body 1.

[0043] The design of the first conveyor belt 15, the second conveyor belt 16 and the pill rolling groove 19 can utilize the movement of the first conveyor belt 15 and the second conveyor belt 16 to guide the protrusions on the square cake-shaped material extruded by the extrusion roller 12 into the corresponding pill rolling groove 19 respectively, and then squeeze and fix the protrusions through the distance between the first conveyor belt 15 and the second conveyor belt 16, so that when the third conveyor belt 17 drives the protrusions to rotate, the square cake-shaped material will not be unevenly stressed and fall apart due to the downward pulling force, so that the protrusions cannot be neatly arranged and enter the pill rolling groove 19, and there is no way to roll the protrusions into spherical pills in sequence, thereby ensuring the overall stability;

[0044] Since the protrusions are originally irregular spherical, they are more likely to form a spherical shape under the action of external force. Therefore, the design of the first conveyor belt 15 and the third conveyor belt 17 can make use of the different speeds of the third conveyor belt 17 so that the protrusions that enter the third conveyor belt 17 in sequence will move downward in a rotating state under the action of the third conveyor belt 17. This movement mode can not only realize the automatic separation of the protrusions, but also automatically wrap the materials on the edge of the protrusions on the surface of the protrusions during the rotation of the protrusions. This design can effectively reduce the waste during the original separation by breaking up. At the same time, it also reduces the generation of dust.

[0045] In this embodiment, a dust removal system is also included, and the air inlet end of the dust removal system is connected to the lifting hopper, the double-roller extrusion granulator and the dust collecting hood above the screening machine through pipelines.

[0046] In this embodiment, an auger conveyor is provided at the waste end of the screening machine, and the output end of the auger conveyor is connected to the feed end of the lifting hopper.

[0047] See also Figure 3 , Figure 4 and Figure 5 In this embodiment, a first extrusion plate 151 is provided in the first conveyor belt 15, and a third extrusion plate 171 is provided in the third conveyor belt 17. The distance between the first extrusion plate 151 and the second extrusion plate 161 enables the first conveyor belt 15 and the third conveyor belt 17 to be slidably connected.

[0048] See also Figure 3 , Figure 4 and Figure 5 In this embodiment, an inverted "eight" shape is formed between the feeding ends of the first conveyor belt 15 and the second conveyor belt 16, and the material squeezed by the squeezing roller 12 is located between the pill rolling grooves 19 on the first conveyor belt 15 and the second conveyor belt 16, and the squeezing grooves are aligned with the pill rolling grooves 19 in the vertical direction. The eight-shaped design enables the protrusions after squeezing to enter the pill rolling grooves 19 better.

[0049] See also Figure 3 , Figure 4 and Figure 5In this embodiment, the first conveyor belt 15 is provided with two first conveyor shafts 152 that are rotatable and used to drive the first conveyor belt 15 to rotate, the second conveyor belt 16 is provided with two second conveyor shafts 162 that are rotatable and used to drive the second conveyor belt 16 to rotate, and the third conveyor belt 17 is provided with two third conveyor shafts 172 that are rotatable and used to drive the third conveyor belt 17 to rotate. The granulator body 1 is provided with a conveying motor for driving the first conveyor shaft 152 and the second conveyor shaft 162 to rotate. The first conveyor shaft 152 and the second conveyor shaft 162 rotate synchronously through gear rotation. The granulator body 1 is provided with symmetrically distributed fixed plates 18, and the first conveyor shaft 152, the second conveyor shaft 162, the third conveyor shaft 172, the first extrusion plate 151, the second extrusion plate 161, and the third extrusion plate 171 are connected to the fixed plate 18.

[0050] In this embodiment, the horizontal distance between the first conveying axis 152 and the second conveying axis 162 at the upper end is greater than the horizontal distance between the first conveying axis 152 and the second conveying axis 162 at the lower end, and the two third conveying axes 172 are vertically aligned with the second conveying axis 162 at the lower end.

[0051] In this embodiment, fixedly connected gears are provided on the second conveying shaft 162 and the third conveying shaft 172, and a synchronous chain is provided between the gears, and the diameter of the gear on the second conveying shaft 162 is larger than the diameter of the gear on the third conveying shaft 172. By utilizing the difference in gear diameters and controlling the gear ratio, the second conveying belt 16 and the third conveying belt 17 can rotate at different speeds.

[0052] In this embodiment, a discharge hopper 14 is provided below the third conveyor belt 17 , a discharge port is provided on one side of the granulator body 1 , the discharge hopper 14 is connected to the discharge port, and a screening hole 141 is provided on the discharge hopper 14 located directly below the third conveyor belt 17 .

[0053] A fertilizer production process, using the fertilizer production system, comprises the following steps:

[0054] S1 sends the fertilizer raw materials into the material mixer for full and uniform mixing, and then transports them to the lifting hopper via the hinged conveyor, and then sends them to the roller extrusion granulator through the lifting hopper for granulation;

[0055] S2 The material entering the granulation body passes through the feed hopper 11 and enters between the extrusion rollers 12. The material is firmly squeezed into the extrusion groove through the extrusion between the extrusion rollers 12, so that the material passing through the extrusion rollers 12 falls in the shape of a square cake, and the material in the extrusion groove forms a plurality of evenly distributed protrusions on the front and rear surfaces of the square after extrusion;

[0056] S3 square material falls into between the first conveyor belt 15 and the second conveyor belt 16. Since the first conveyor belt 15 and the second conveyor belt 16 rotate synchronously, and the rotation speed of the first conveyor belt 15 and the second conveyor belt 16 is the same as the falling material, the ball rolling grooves 19 on the first conveyor belt 15 and the second conveyor belt 16 can squeeze and fix the protrusions during the movement;

[0057] S4 When the material moves to the third conveyor belt 17, since the rotation speed of the third conveyor belt 17 is greater than that of the second conveyor belt 16, the third conveyor belt 17 can roll the extruded protrusions downward, and through the friction force and the characteristics of the shape of the pill rolling groove 19, it can imitate the action of Chinese medicine pill rolling, so that the protrusions are automatically separated and automatically rolled into a ball shape, and the protrusions that do not enter the third conveyor belt 17 are fixed by the second conveyor belt 16 and the first conveyor belt 15, so there will be no situation where the material is unevenly stressed and causes large-scale automatic disintegration;

[0058] S5 The formed fertilizer particles are sent to the screen machine for screening, and the fertilizer particles that meet the standards after screening are transported to the finished product warehouse through the belt conveyor;

[0059] S6 sends the fertilizer granules in the finished product warehouse into the weighing and packaging machine, which automatically packages them into shape after weighing, and finally packs them for shipment.

[0060] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0061] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0062] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present application should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. A fertilizer production system, characterized in that: The invention comprises a material mixer, an auger conveyor, a lifting hopper, a roller extrusion granulator, a screening machine, a belt conveyor mechanism, a finished product warehouse and a weighing and packaging machine, wherein the material mixer, the auger conveyor, the lifting hopper, the roller extrusion granulator, the screening machine, the belt conveyor mechanism, the finished product warehouse and the weighing and packaging machine are connected end to end in sequence, the roller extrusion granulator comprises a granulator body, two extrusion rollers rotating synchronously in the opposite direction are arranged in the granulator body, a plurality of evenly distributed extrusion grooves are arranged on the extrusion rollers, a feed hopper is arranged on the granulator body above the extrusion rollers, a vertical and rotatable first conveyor belt is arranged in the granulator body below the extrusion rollers, a second conveyor belt is arranged on one side of the first conveyor belt, a third conveyor belt is arranged below the second conveyor belt, the first conveyor belt and the second conveyor belt rotate synchronously in the opposite direction, the rotation speed of the second conveyor belt is lower than the rotation speed of the third conveyor belt, a plurality of annular and semicircular pill rolling grooves are arranged on the first conveyor belt, the second conveyor belt and the third conveyor belt, the rotation speed of the first conveyor belt is the same as the speed at which the material descends from the extrusion roller.

2. The fertilizer production system according to claim 1, characterized in that: It also includes a dust removal system, the air inlet end of which is connected to the lifting hopper, the roller extrusion granulator and the dust collecting hood above the screening machine through pipelines.

3. The fertilizer production system according to claim 1, characterized in that: The waste end of the screening machine is provided with an auger conveyor, and the output end of the auger conveyor is connected with the feed end of the lifting hopper.

4. The fertilizer production system according to claim 1, characterized in that: A first extrusion plate is provided in the first conveyor belt, and a third extrusion plate is provided in the third conveyor belt. The distance between the first extrusion plate and the second extrusion plate enables the first conveyor belt and the third conveyor belt to be slidably connected.

5. The fertilizer production system according to claim 1, characterized in that: An inverted "eight" shape is formed between the feeding ends of the first conveyor belt and the second conveyor belt, and the material squeezed by the squeezing roller is located between the pill rolling grooves on the first conveyor belt and the second conveyor belt, and the squeezing groove is aligned with the pill rolling groove in the vertical direction.

6. The fertilizer production system according to claim 1, characterized in that: The first conveyor belt is provided with two rotatable first conveyor shafts for driving the first conveyor belt to rotate, the second conveyor belt is provided with two rotatable second conveyor shafts for driving the second conveyor belt to rotate, and the third conveyor belt is provided with two rotatable third conveyor shafts for driving the third conveyor belt to rotate.

7. The fertilizer production system according to claim 6, characterized in that: The horizontal distance between the first conveying axis and the second conveying axis at the upper end is greater than the horizontal distance between the first conveying axis and the second conveying axis at the lower end, and the two third conveying axes are aligned with the second conveying axis at the lower end in the vertical direction.

8. The fertilizer production system according to claim 7, characterized in that: The second conveying shaft and the third conveying shaft are both provided with fixedly connected gears, a synchronous chain connected between the gears is provided, and the diameter of the gear on the second conveying shaft is greater than the diameter of the gear on the third conveying shaft.

9. The fertilizer production system according to claim 1, characterized in that: A discharge hopper is provided below the third conveyor belt, a discharge port is provided on one side of the granulator body, the discharge hopper is connected to the discharge port, and a screening hole is provided on the discharge hopper located directly below the third conveyor belt.

10. A fertilizer production process, using the fertilizer production system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1 sends the fertilizer raw materials into the material mixer for full and uniform mixing, and then transports them to the lifting hopper via the hinged conveyor, and then sends them to the roller extrusion granulator through the lifting hopper for granulation; S2 The material entering the granulation body enters between the extrusion rollers through the feed hopper. Through the extrusion between the extrusion rollers, the material is firmly squeezed into the extrusion groove, so that the material passing through the extrusion roller falls in the shape of a square cake, and the material in the extrusion groove will form multiple evenly distributed protrusions on the front and rear surfaces of the square after extrusion; S3 square material falls into the space between the first conveyor belt and the second conveyor belt. Since the first conveyor belt and the second conveyor belt rotate synchronously and the rotation speed of the first conveyor belt and the second conveyor belt is the same as the falling material, the ball rolling grooves on the first conveyor belt and the second conveyor belt can squeeze and fix the protrusions during the movement; S4 When the material moves to the third conveyor belt, since the rotation speed of the third conveyor belt is greater than that of the second conveyor belt, the third conveyor belt can roll the extruded protrusions downward, and through the characteristics of friction and the shape of the pill-rolling groove, it can imitate the action of Chinese medicine pill-rolling, so that the protrusions are automatically separated and automatically rolled into a ball shape, and the protrusions that do not enter the third conveyor belt are fixed by the second conveyor belt and the first conveyor belt, so there will be no situation where the material is unevenly stressed and causes large-scale automatic disintegration; S5 The formed fertilizer particles are sent to the screen machine for screening, and the fertilizer particles that meet the standards after screening are transported to the finished product warehouse through the belt conveyor; S6 sends the fertilizer granules in the finished product warehouse into the weighing and packaging machine, which automatically packages them into shape after weighing, and finally packs them for shipment.

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