Production method of polyglutamic acid compound fertilizer

Abstract

The invention discloses a production method of a polyglutamic acid compound fertilizer, which comprises the following steps: uniformly mixing a basic compound fertilizer, putting into a roller granulator, and dissolving sodium polyglutamate in water to prepare a neutral solution; the sodium polyglutamate aqueous solution, an acid solution and a cross-linking agent are jointly used as a binder and are respectively sprayed into a roller granulator through a pipeline in a spray form for granulation, and compound fertilizer particles are cooled and coated after being discharged. The polyglutamic acid compound fertilizer needs less heat energy in the production process, the problems of pipeline blockage and granulation failure can be avoided, the material returning speed is high, the material returning regeneration rate is low, and the production efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of energy conservation and environmental protection, in particular to a method for producing a polyglutamic acid compound fertilizer. Background Art

[0002] Polyglutamic acid compound fertilizer is a novel product that combines a polyglutamic acid synergist with conventional fertilizers. Polyglutamic acid is a linear polymer composed of glutamic acid monomers linked by γ-amide bonds. Due to its high concentration of hydrophilic carboxyl groups (two per glutamic acid unit), γ-PGA possesses strong hydrophilicity and water-retention capabilities, absorbing over 1,000 times its weight in water. When added to fertilizers, the carboxyl groups in the molecule form a "water film" that reduces soil evaporation and enhances drought resistance. Its polyanionic properties chelate nitrogen, phosphorus, potassium, and trace elements, reducing phosphate precipitation and increasing phosphate fertilizer absorption by 15%-20%, extending the effective life of fertilizers. Furthermore, its molecules can chelate toxic heavy metals such as lead, cadmium, and arsenic, reducing plant absorption and soil toxicity. It is a key additive for future green agriculture.

[0003] At present, the production process of polyglutamic acid compound fertilizer is to mix polyglutamic acid with basic fertilizers such as nitrogen, phosphorus and potassium in proportion, then granulate, cool and screen, and coat. For example, patent CN102875234B discloses a new type of synergistic compound fertilizer and its preparation method. The basic ingredients are added to the batching system for uniform mixing, and then mixed with polyglutamic acid hydrogel again and put into the granulation system for granulation. After granulation, it is put into the drum screening machine for primary screening, then into the rotary dryer for drying, and finally through the drum screening machine for secondary screening and coating. The entire production process requires the use of conveyor belts to transfer between multiple devices such as the drum granulator, drum screening machine, and drum dryer. In particular, the small particles after screening need to be refluxed into the drum granulator for further coating and growth. The temperature required for granulation and drying is 65-80 ° C. During the transfer process, a large amount of heat will be exchanged with the air, wasting energy and driving up enterprise costs.

[0004] At the same time, polyglutamic acid has strong hygroscopicity and easily forms gel when dissolved in water, which is prone to blockage when transported through pipelines. At the same time, polyglutamic acid is prone to adhesion to the material in the drum granulator, increasing the risk of granulation failure. The gel-formed polyglutamic acid has a high water content, and the granular material has a high moisture content. Not only does it require increasing the heating temperature for further dehydration, which undoubtedly further increases energy demand, but it is also easy to break during the transfer, screening and drying process, and the return material regeneration demand is high, resulting in low production efficiency. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for producing polyglutamic acid compound fertilizer to solve the problem in the prior art that the direct compounding of polyglutamic acid to produce compound fertilizer results in high heating energy demand and a large amount of heat energy is wasted during the transfer process.

[0006] The purpose of the present invention is achieved through the following technical solution: A method for producing polyglutamic acid compound fertilizer comprises the following steps:

[0007] S1. Mix the basic compound fertilizer evenly and put it into the drum granulator;

[0008] S2. Dissolve sodium polyglutamate in water to prepare a neutral solution;

[0009] S3. The aqueous solution of sodium polyglutamate and the acidic solution and the cross-linking agent are jointly used as a binder and are sprayed into the drum granulator through the pipeline in the form of a spray for granulation;

[0010] S4. After the compound fertilizer particles are discharged, they are cooled and coated.

[0011] Preferably, the acidic solution is phosphoric acid or dihydrogen phosphate.

[0012] Preferably, the cross-linking agent is ethylene glycol diglycidyl ether or aminopolysaccharide.

[0013] Preferably, the granulation temperature is 55-65°C.

[0014] Preferably, the drum granulator includes an outer cylinder, an inner cylinder and a roller mechanism that supports and lifts the outer cylinder for rotation, the outer cylinder and the inner cylinder are both truncated cone-shaped tubular structures, the inner cylinder portion is sleeved inside the outer cylinder, the outer cylinder and the inner cylinder are sealed together, the outer cylinder and the inner cylinder are inclined in opposite directions to the circumferential surfaces of the outer cylinder, the big end of the inner cylinder is located inside the small end of the outer cylinder, the big end of the inner cylinder is provided with a plurality of screening holes, the screening holes are arranged around the inner cylinder, the big end of the outer cylinder is provided with a plurality of feeding pipes, the feeding pipe includes a vertical pipe and an arc pipe, the arc pipe is adapted to the arc surface of the outer cylinder, one end of the vertical pipe is connected to the end of the arc pipe, the other end of the vertical pipe is provided with a discharge port, the feeding pipe passes through and extends into the inner cylinder, the feeding pipe is fixedly connected to the inner cylinder, and the plurality of feeding pipes are evenly spaced and arranged around the inner cylinder.

[0015] Preferably, a first fixed plate, a second fixed plate, a plurality of spiral screen plates and a discharge pipe are provided in the large head end of the inner cylinder, and the plurality of spiral screen plates are located between the first fixed plate and the second fixed plate. The sides of the spiral screen plates are fixedly connected to the first fixed plate and the second fixed plate respectively, and the end of the discharge pipe passes through the center of the second fixed plate and is fixedly connected to the first fixed plate. One end of the spiral screen plate is fixedly connected to the discharge pipe, and the spiral screen plate spirally extends outward with the discharge pipe as the center. The discharge pipe is provided with a discharge hole tangent to the spiral screen plate, and the small head end of the outer cylinder is provided with a sealing plate, and the sealing plate is fixedly and sealingly connected to the outer cylinder, and the discharge pipe passes through the sealing plate.

[0016] Preferably, a first air guide ring and a second air guide ring are provided on the second fixed plate, and the first air guide ring and the second air guide ring are concentrically arranged with the discharge pipe. One end of the first air guide ring passes through the second fixed plate, and the other end of the first air guide ring is slidably inserted into the second air guide ring. The second air guide ring passes through the sealing plate and is rotatably connected to the sealing plate, and an air inlet pipe is provided on the second air guide ring.

[0017] Preferably, the outer cylinder and the inner cylinder are fixedly and sealedly connected, a first ring gear and a first motor are provided on the outer cylinder, and an output end of the first motor is meshedly connected with the first ring gear.

[0018] Preferably, the outer cylinder and the inner cylinder are rotationally sealed and connected, the outer cylinder is provided with a first ring gear and a first motor, the output end of the first motor is meshed and connected with the first ring gear, the inner cylinder is provided with a second ring gear and a second motor, the output end of the second motor is meshed and connected with the second ring gear.

[0019] Preferably, a corrugated ring is provided on the sealing plate, and a plurality of push rods are provided on the second fixed plate, and the plurality of push rods are arranged at intervals with the discharge tube as the center of the circle, one end of the push rod is fixedly connected to the second fixed plate, and the other end of the push rod abuts the corrugated surface of the corrugated ring, and a slider, a limiting ring, a third fixed plate, a spring, and a limiting rod are provided on the discharge tube, and the limiting ring and the third fixed plate are sleeved on the discharge tube, and the limiting ring passes through the sealing plate and is fixedly connected to the sealing plate, one end of the slider is fixedly connected to the discharge tube, and the slider passes through the limiting ring, and the slider, the discharge tube and the limiting ring are slidably connected, and the third fixed plate is fixedly connected to the discharge tube, and a plurality of limiting rods are evenly distributed on the third fixed plate with the discharge tube as the center of the circle, and the spring is sleeved on the limiting rod and is located between the third fixed plate and the sealing plate.

[0020] The present invention has the following advantages:

[0021] 1. Provided is a method for producing polyglutamic acid compound fertilizer. By using sodium polyglutamate to replace polyglutamic acid in the existing granulation process, the method solves the problems of polyglutamic acid's strong hygroscopicity and easy gel formation, which can lead to nozzle blockage and the risk of material adhesion in the drum granulator, preventing successful granulation. The method also reduces the required granulation temperature and saves energy.

[0022] 2. Provide a drum granulator for polyglutamic acid compound fertilizer, which integrates granulation, screening and drying. Compared with the separately installed drum granulator, drum screening machine and drum dryer, it not only reduces the floor space, but also avoids the problems of rapid heat loss, easy breakage and high return material regeneration caused by material transportation, further saving energy and reducing enterprise costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of a half-section structure of an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of the material lifting pipe of the present invention;

[0026] Figure 4 This is a schematic diagram of the installation structure of the spiral sieve plate of the present invention;

[0027] Figure 5 This is a schematic diagram of the installation structure of the spiral sieve plate of the present invention in another direction;

[0028] Figure 6 yes Figure 2 Schematic diagram of the structure enlarged at point A in the middle.

[0029] In the figure, 1. outer cylinder; 2. inner cylinder; 3. roller mechanism; 4. first gear ring; 5. first motor; 6. second gear ring; 7. second motor; 8. feed port; 9. sieve hole; 10. lifting pipe; 11. vertical pipe; 12. arc pipe; 13. discharge port; 14. spiral sieve plate; 15. discharge pipe; 16. discharge hole; 17. first fixed plate; 18. second fixed plate; 19. slider; 20. limiting ring; 21. corrugated ring; 22. push rod; 23. third fixed plate; 24. limiting rod; 25. spring; 26. first air guide ring; 27. second air guide ring; 28. air inlet pipe; 29. sealing plate; 30. air jet. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0032] A method for producing polyglutamic acid compound fertilizer relies on an improved drum granulator, such as Figure 1 、 Figure 2 As shown, the drum granulator includes an outer drum 1, an inner drum 2 and a roller mechanism 3 supporting and lifting the outer drum 1 for rotation, a first gear ring 4, a first motor 5, a second gear ring 6, and a second motor 7. The roller mechanism 3 is 2 groups with the same structure as the roller device of the existing drum granulator. The first gear ring 4 is fixedly mounted on the outer drum 1, and the output end of the first motor 5 is connected to the first gear ring 4 by gear meshing to drive the outer drum 1 to rotate. The second gear ring 6 is mounted on the inner drum 2, and the output end of the second motor 7 is connected to the second gear ring 6 by gear meshing. The second motor 7 drives the inner drum 2 to rotate. The speeds of the inner drum 2 and the outer drum 1 are set to be different. The outer drum 1 and the inner drum 2 are both truncated cone-shaped tubular structures, that is, one end of the outer drum 1 and the inner drum 2 has a larger opening and the other end has a smaller opening. This structure The design can form an inclined surface on the circumferential surface of the outer cylinder 1 and the inner cylinder 2. The materials in the outer cylinder 1 and the inner cylinder 2 can slowly move from the small head end to the large head end under the rotation drive, thereby realizing the feeding function. The small head end of the inner cylinder 2 is the feeding port 8, and the inner cylinder 2 is partially sleeved in the outer cylinder 1. The outer cylinder 1 and the inner cylinder 2 are rotationally sealed and connected. The circumferential surfaces of the outer cylinder 1 and the inner cylinder 2 are inclined in opposite directions. The large head end of the inner cylinder 2 is located inside the small head end of the outer cylinder 1, and a plurality of screening holes 9 are provided at the large head end of the inner cylinder 2. The screening holes 9 are arranged around the inner cylinder 2. The screening holes 9 are all located at the end of the inner cylinder 2, and the screening width is much smaller than that of an independent drum screening machine. The small particles after granulation pass through the screening holes 9 into the feeding channel between the inner cylinder 2 and the outer cylinder 1.

[0033] like Figure 3As shown, a plurality of feeding pipes 10 are installed at the big end of the outer cylinder 1, and the feeding pipes 10 include a vertical pipe 11 and an arc-shaped pipe 12. The arc-shaped pipe 12 is adapted to the arc surface of the outer cylinder 1, and the arc-shaped pipe 12 is arranged close to the inner circumferential surface of the outer cylinder 1. One end of the vertical pipe 11 is connected to the end of the arc-shaped pipe 12, and a discharge port 13 is opened at the other end of the vertical pipe 11. The opening direction of the discharge port 13 is toward the big end of the inner cylinder 2. The feeding pipe 10 passes through and extends into the inner cylinder 2. The height of the discharge port 13 is greater than the height of the granulation raw material in the inner cylinder 2 to prevent the material from flowing back into the feeding pipe 10. The feeding pipe 10 is fixedly connected to the inner cylinder 2. Multiple feeding pipes 10 are evenly spaced and arranged around the inner cylinder 2. The rotating arc-shaped pipe 12 shovels up the material in the outer cylinder 1 and discharges it into the inner cylinder 2 through the vertical pipe 11.

[0034] like Figure 2 、 Figure 6 As shown, a sealing plate 29 is installed at the small end of the outer cylinder 1, and the sealing plate 29 is fixedly and sealedly connected to the outer cylinder 1. A first fixed plate 17, a second fixed plate 18, three spiral sieve plates 14, and a discharge pipe 15 are provided in the large end of the inner cylinder 2. The first fixed plate 17 and the second fixed plate 18 are both circular plates and have a diameter smaller than the large end diameter of the inner cylinder 2. The three spiral sieve plates 14 are located between the first fixed plate 17 and the second fixed plate 18. The sides of the spiral sieve plate 14 are fixedly connected to the first fixed plate 17 and the second fixed plate 18 respectively. The end of the discharge pipe 15 passes through the center of the second fixed plate 18 and is fixedly connected to the first fixed plate 17, as shown in FIG. Figure 4 、 Figure 5 As shown, one end of the spiral screen plate 14 is fixedly connected to the discharge pipe 15, and the other end of the spiral screen plate 14 spirally extends outward with the discharge pipe 15 as the center. The spiral screen plate 14 is an Archimedean spiral structure, and the three spiral screen plates 14 are evenly spaced. The tail end of the spiral screen plate 14 extends to the top of the sieve hole 9, so that the spiral screen plate 14 can scoop up part of the granular material to be screened. The discharge pipe 15 is provided with three discharge holes 16 tangent to the spiral screen plate 14.

[0035] like Figure 5As shown, a corrugated ring 21 is installed on the sealing plate 29. The corrugated ring 21 is a sleeve structure with one end of a corrugated surface and the other end of a plane. One end of the plane is fixedly connected to the sealing plate 29. A plurality of ejector pins 22 are installed on the second fixed plate 18. The plurality of ejector pins 22 are arranged at intervals with the discharge pipe 15 as the center of the circle. One end of the ejector pin 22 is fixedly connected to the second fixed plate 18, and the other end of the ejector pin 22 abuts the corrugated surface of the corrugated ring 21 through a ball. A slider 19, a limiting ring 20, a third fixed plate 23, a plurality of springs 25, and a plurality of limiting rods 24 are installed on the discharge pipe 15. The limiting ring 20 and the third fixed plate 23 are sleeved on the discharge pipe 15. The limiting ring 20 passes through It passes through the sealing plate 29 and is fixedly connected to the sealing plate 29. The slider 19 is a rectangular block structure. The bottom end face of the slider 19 is fixedly connected to the discharge pipe 15. The slider 19 passes through the limiting ring 20. The slider 19, the discharge pipe 15 and the limiting ring 20 are connected for sliding left and right. The third fixed plate 23 is fixedly connected to the discharge pipe 15. A plurality of limiting rods 24 are evenly spaced on the left end face of the third fixed plate 23 with the discharge pipe 15 as the center. The spring 25 is mounted on the limiting rod 24 and is located between the third fixed plate 23 and the sealing plate 29. The spring 25 squeezes the third fixed plate 23 and the sealing plate 29 respectively so that the discharge pipe 15 has a tendency to slide to the right.

[0036] The first air guide ring 26 and the second air guide ring 27 are installed on the second fixed plate 18. The first air guide ring 26 is formed by two tubes in a nested manner to form an air duct. The second air guide ring 27 is an annular structure. An annular air vent groove is provided in the second air guide ring 27. The first air guide ring 26 and the second air guide ring 27 are concentrically arranged with the discharge pipe 15. One end of the first air guide ring 26 passes through the second fixed plate 18 to form an air jet 30. The other end of the first air guide ring 26 is slidably inserted into the annular air vent groove in the second air guide ring 27. The second air guide ring 27 passes through the sealing plate 29 and is rotatably connected to the sealing plate 29. An air inlet pipe 28 is installed on the second air guide ring 27, and the air inlet pipe 28 passes heated air.

[0037] Working principle: The basic compound fertilizer containing urea, diammonium phosphate, potassium sulfate, trace elements and minerals is put into the drum granulator through the feed port 8. The outer drum 1 rotates under the drive of the first motor 5, and the inner drum 2 rotates under the drive of the second motor 7. The speeds of the two are set to be different. After the acid solution is mixed with the cross-linking agent, it is extended to the inner drum 2 through two pipes with the sodium polyglutamate aqueous solution for spraying. The basic compound fertilizer rotates continuously during the rolling process to complete the granulation. The granular material moves continuously to the right to the big end of the inner drum 2 during the rotation process. The granular material that does not meet the requirements The granules are fed into the inner tube 2 through the sieve hole 9 and move to the left to the large end of the outer tube 1 during the continuous rotation. The lifting pipe 10 rotates to scoop up the accumulated small particles and pass through the arc tube 12, the vertical tube 11 and the discharge port 13 in turn to enter the inner tube 2 for circulation, thus realizing the automatic screening and recovery function of small particles. The large particles after granulation will accumulate at the large end of the inner tube 2. The rotation of the outer tube 1 drives the discharge pipe 15, the first fixed plate 17, the second fixed plate 18, the spiral screen plate 14 and the top rod 22 to rotate. The spiral screen plate 14 rotates to scoop up the accumulated particles and continuously rotates. The material passes through the discharge hole 16 and enters the discharge pipe 15 and is finally discharged. Since the distribution length of the sieve hole 9 is short, large and small particles will accumulate. The large proportion of large particles will increase the probability of clogging the sieve hole 9 and reduce the screening rate. The rotating spiral screen plate 14 can scoop up the accumulated materials and make the large and small particles roll and screen on the spiral screen plate 14. The small particles gradually fall and gather through the sieve holes of the spiral screen plate 14, reducing the proportion of large particles in the accumulated materials on the sieve hole 9 and improving the screening efficiency. The outer cylinder 1 and the inner cylinder 2 are driven by the first motor 5 and the second motor 7. The inner cylinder 2 not only rotates relative to the ground, but also has different rotation speeds, so that the inner cylinder 2 rotates relative to the outer cylinder 1, and the rotating spiral screen plate 14 drives the push rod 22 to push and slide relative to the corrugated ring 21. The corrugated surface on the corrugated ring 21 causes the push rod 14 to reciprocate left and right under the action of the spring 25. The push rod 14 drives the first fixed plate 17, the second fixed plate 18, the spiral screen plate 14, the discharge pipe 15, and the slider 19 to slide left and right relative to the sealing plate 29 and the limit ring 20. The spiral screen plate 14 that slides left and right can achieve a vibration screening effect on the granular material carried inside, thereby accelerating the screening efficiency;Simultaneously, the push rod 14 drives the first air guide ring 26 to slide left and right within the second air guide ring 27 in a sealed manner. Due to the different rotational speeds between the inner tube 2 and the outer tube 1, the first air guide ring 26 also rotates within the second air guide ring 27. The heated hot air passes through the air inlet pipe 26, sequentially through the second air guide ring 27, the first air guide ring 26, and the air jet 30, entering the spiral screen plate 14 and ultimately entering the inner tube 2, thereby heating the material. Because the large particles roll in layers on the spiral screen plate 14 while the small particles fall and flow, the heat exchange area is increased, achieving a rapid drying function. The dried, high-heat small particles move along the outer tube 1 and quickly return to the inner tube 2 for use. At the same time, the outer tube 1 wraps around the inner tube 2 to form a layered structure, which can reduce the internal heat loss rate and improve energy utilization.

[0038] A method for producing polyglutamic acid compound fertilizer comprises the following steps:

[0039] S1. Mix the basic compound fertilizer evenly and put it into the drum granulator;

[0040] S2. Sodium polyglutamate is dissolved in water to form a neutral solution. Sodium polyglutamate is more water-soluble than polyglutamic acid, preventing precipitation and gel clogging of pipelines. Polyglutamic acid is also more hygroscopic than sodium polyglutamate, thus avoiding the risk of material adhesion and granulation failure during rotation in existing drum granulators.

[0041] S3. The sodium polyglutamate aqueous solution is extended to the feed port 8 by using a nozzle, and the acidic solution is selected from industrial phosphoric acid or sodium dihydrogen phosphate solution, which not only provides an acidic reaction environment, but also phosphoric acid can be used as a phosphate fertilizer. Of course, sulfuric acid or hydrochloric acid can also be selected as the acidic solution. The cross-linking agent is selected from ethylene glycol diglycidyl ether or amino polysaccharide. Ethylene glycol diglycidyl ether or amino polysaccharide reacts slowly or does not react with phosphoric acid under low temperature conditions, which can avoid premature cross-linking failure. After the cross-linking agent and the acidic solution are mixed evenly, a nozzle is also used to extend to the feed port 8. The sodium polyglutamate aqueous solution pipeline and the mixed solution are respectively sprayed into the drum granulator in the form of a spray for granulation. The flow rate of the sodium polyglutamate aqueous solution, the cross-linking agent, and the acidic solution is controlled to a pH value of 3.5-4.5 after mixing. Under this condition, sodium polyglutamate and the basic compound fertilizer are coated and matched with a temperature of 55-60 ° C to achieve rapid cross-linking and bonding, and complete granulation;

[0042] S4. After the drum granulator completes the granulation, the compound fertilizer granules are discharged and then cooled and coated.

[0043] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for producing a polyglutamic acid compound fertilizer, characterized in that: The following steps are included: S1. Mix the basic compound fertilizer evenly and put it into the drum granulator; S2. Dissolve sodium polyglutamate in water to prepare a neutral solution; S3 sodium polyglutamate aqueous solution and acidic solution, cross-linking agent together as a binder were sprayed through the pipeline in the form of a spray into the drum granulator for granulation to form compound fertilizer particles; S4. After the compound fertilizer particles are discharged, they are cooled and coated.

2. The production method of a polyglutamic acid compound fertilizer according to claim 1, wherein: The acidic solution is phosphoric acid or dihydrogen phosphate.

3. The production method of a polyglutamic acid compound fertilizer according to claim 1, wherein: The cross-linking agent is ethylene glycol diglycidyl ether or aminopolysaccharide.

4. The production method of a polyglutamic acid compound fertilizer according to claim 1, wherein: In step S3, the granulation temperature is 55-65°C.

5. The production method of a polyglutamic acid compound fertilizer according to claim 1, wherein: The drum granulator comprises an outer cylinder (1), an inner cylinder (2) and a roller mechanism (3) for supporting and lifting the outer cylinder (1) for rotation. The outer cylinder (1) and the inner cylinder (2) are both truncated cone-shaped tubular structures. The inner cylinder (2) is partially sleeved inside the outer cylinder (1). The outer cylinder (1) and the inner cylinder (2) are sealed and connected. The circumferential surfaces of the outer cylinder (1) and the inner cylinder (2) are inclined in opposite directions. The large end of the inner cylinder (2) is located inside the small end of the outer cylinder (1). The large end of the inner cylinder (2) is provided with a plurality of sieve holes (9). The sieve holes (9) surround the inner cylinder (2). ) is provided, a plurality of material raising pipes (10) are provided at the large end of the outer cylinder (1), the material raising pipes (10) include a vertical pipe (11) and an arc-shaped pipe (12), the arc-shaped pipe (12) is adapted to the arc surface of the outer cylinder (1), one end of the vertical pipe (11) is connected to the end of the arc-shaped pipe (12), and the other end of the vertical pipe (11) is provided with a discharge port (13), the material raising pipe (10) passes through and extends into the inner cylinder (2), the material raising pipe (10) is fixedly connected to the inner cylinder (2), and a plurality of the material raising pipes (10) are evenly spaced and arranged around the inner cylinder (2).

6. The method for producing a polyglutamic acid compound fertilizer according to claim 5, wherein: A first fixed plate (17), a second fixed plate (18), a plurality of spiral sieve plates (14), and a discharge pipe (15) are provided in the large end of the inner cylinder (2). The plurality of spiral sieve plates (14) are located between the first fixed plate (17) and the second fixed plate (18). The sides of the spiral sieve plates (14) are fixedly connected to the first fixed plate (17) and the second fixed plate (18). The end of the discharge pipe (15) passes through the center of the second fixed plate (18) and is fixedly connected to the first fixed plate (17) and the second fixed plate (18). The first fixed plate (17) is connected, one end of the spiral sieve plate (14) is fixedly connected to the discharge pipe (15), the spiral sieve plate (14) spirally extends outward with the discharge pipe (15) as the center, and the discharge pipe (15) is provided with a discharge hole (16) tangential to the spiral sieve plate (14), and the small end of the outer cylinder (1) is provided with a sealing plate (29), the sealing plate (29) is fixedly and sealingly connected to the outer cylinder (1), and the discharge pipe (15) passes through the sealing plate (29).

7. The method for producing a polyglutamic acid compound fertilizer according to claim 6, wherein: A first air guide ring (26) and a second air guide ring (27) are provided on the second fixed plate (18). The first air guide ring (26) and the second air guide ring (27) are concentrically arranged with the discharge pipe (15). One end of the first air guide ring (26) passes through the second fixed plate (18), and the other end of the first air guide ring (26) is slidably inserted into the second air guide ring (27). The second air guide ring (27) passes through the sealing plate (29) and is rotatably connected to the sealing plate (29). An air inlet pipe (28) is provided on the second air guide ring (27).

8. The method for producing a polyglutamic acid compound fertilizer according to claim 7, wherein: The outer cylinder (1) and the inner cylinder (2) are fixedly and sealedly connected. A first gear ring (4) and a first motor (5) are provided on the outer cylinder (1). The output end of the first motor (5) is meshedly connected with the gear of the first gear ring (4).

9. The method for producing a polyglutamic acid compound fertilizer according to claim 7, wherein: The outer cylinder (1) and the inner cylinder (2) are rotatably sealed and connected. The outer cylinder (1) is provided with a first gear ring (4) and a first motor (5). The output end of the first motor (5) is meshedly connected with the gear of the first gear ring (4). The inner cylinder (2) is provided with a second gear ring (6) and a second motor (7). The output end of the second motor (7) is meshedly connected with the gear of the second gear ring (6).

10. The method for producing a polyglutamic acid compound fertilizer according to claim 9, wherein: The sealing plate (29) is provided with a corrugated ring (21), the second fixed plate (18) is provided with a plurality of push rods (22), the plurality of push rods (22) are arranged at intervals with the discharge pipe (15) as the center of the circle, one end of the push rod (22) is fixedly connected to the second fixed plate (18), and the other end of the push rod (22) abuts against the corrugated surface of the corrugated ring (21), the discharge pipe (15) is provided with a slider (19), a limiting ring (20), a third fixed plate (23), a spring (25), and a limiting rod (24), the limiting ring (20) and the third fixed plate (23) are sleeved on the discharge pipe (15), the limiting ring (20) The slider (19) passes through the sealing plate (29) and is fixedly connected to the sealing plate (29); one end of the slider (19) is fixedly connected to the discharge pipe (15); the slider (19) passes through the limiting ring (20); the slider (19), the discharge pipe (15) and the limiting ring (20) are slidably connected; the third fixed plate (23) is fixedly connected to the discharge pipe (15); a plurality of limiting rods (24) are evenly spaced on the third fixed plate (23) with the discharge pipe (15) as the center; the spring (25) is mounted on the limiting rod (24) and is located between the third fixed plate (23) and the sealing plate (29).

Images