Compound microbial fertilizer and production method and device thereof

Abstract

The invention belongs to the technical field of microbial fertilizers, and discloses a compound microbial fertilizer and a production method and device thereof. The compound microbial fertilizer is prepared from the following materials in parts by weight: 4 to 7 parts of amino acid concentrated solution, 1 to 2 parts of bacillus licheniformis, 1 to 2 parts of bacillus subtilis, 2 to 4 parts of graphite powder, 20 to 23 parts of urea, 20 to 5 parts of monoammonium phosphate, 10 to 25 parts of potassium chloride, 5 to 8 parts of ammonium sulfate, 2.5 to 5 parts of ammonium bicarbonate, 15 to 20 parts of humic acid, 0.001 to 0.003 part of magnesium sulfate, 0.002 to 0.0025 part of zinc sulfate and 0.001 to 0.003 part of borax. According to the scheme, beneficial microorganisms such as bacillus licheniformis and bacillus subtilis are added, so that the soil micro-ecological environment can be improved, crop root development can be promoted, the nutrient absorption and utilization rate of crops can be improved, and the yield and quality of the crops can be improved; the problem that an existing compound microbial fertilizer is low in utilization rate is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of microbial fertilizers, and specifically relates to a composite microbial fertilizer and a production method and device thereof. Background Art

[0002] Referring to the document with the existing publication (announcement) number CN117700273A, a composite microbial fertilizer and a preparation method thereof are disclosed. The composite microbial fertilizer is a living microbial fertilizer composed of a specific microorganism and a nutrient, which can provide or improve plant nutrition, and can also improve agricultural product yield and improve agricultural product quality. The composite microbial fertilizer relies on two parts: microorganisms and mineral elements, and the microorganisms mainly rely on the bacteria themselves and metabolites to exert their effects; the microorganisms contained in the composite microbial fertilizer are mainly functional microorganisms, including lactic acid bacteria, yeast, bacillus and mold, etc., which mainly play the role of improving soil, dissolving phosphorus and potassium, etc. The life activities of the microorganisms themselves increase the supply of nutrients or improve the soil aggregate structure, thereby improving the plant nutrition level and promoting the increase in production and quality; the metabolites produced by microorganisms, such as hormone substances, can also stimulate the plant to absorb nutrients, or can antagonize the pathogenic effects of certain pathogenic microorganisms, reduce pests and diseases, and increase crop yields.

[0003] Although existing compound fertilizers contain microbial components, they do not fully supplement the trace elements required by crops. Although the demand for these trace elements is small, the lack of these trace elements will lead to stunted crop growth, reduced yields and lower quality. When compound fertilizers lack these trace elements, crops cannot obtain enough trace elements to support their normal physiological processes, resulting in reduced fertilizer utilization. Summary of the invention

[0004] The purpose of this scheme is to provide a compound microbial fertilizer to solve the problem of low utilization rate of existing compound microbial fertilizers.

[0005] In order to achieve the above-mentioned purpose, the present scheme provides a composite microbial fertilizer, which is made of the following materials in parts by weight: 4-7 parts of amino acid concentrate, 1-2 parts of Bacillus licheniformis, 1-2 parts of Bacillus subtilis, 2-4 parts of graphite powder, 20-23 parts of urea, 20-35 parts of monoammonium phosphate, 10-25 parts of potassium chloride, 5-8 parts of ammonium sulfate, 2.5-5 parts of ammonium bicarbonate, 15-20 parts of humic acid, 0.001-0.003 parts of magnesium sulfate, 0.002-0.0025 parts of zinc sulfate and 0.001-0.003 parts of borax.

[0006] The principle and effect of this scheme are as follows: (1) By adding beneficial microorganisms such as Bacillus licheniformis and Bacillus subtilis, the soil microecological environment can be improved, the development of crop roots can be promoted, and the absorption and utilization rate of nutrients by crops can be increased, thereby improving the yield and quality of crops. At the same time, the presence of beneficial microorganisms can inhibit the growth of harmful microorganisms in the soil, maintain the balance of soil microbial communities, and reduce the occurrence of diseases and pests. (2) Organic components such as amino acid concentrate and humic acid in compound microbial fertilizers can improve soil structure, increase the soil's ability to retain water and fertilizer, and help improve soil fertility. (3) By adding appropriate amounts of trace elements such as magnesium sulfate, zinc sulfate and borax, the trace elements required for crop growth can be supplemented, further improving the utilization efficiency of fertilizers.

[0007] Furthermore, the composite microbial fertilizer is made of the following materials in parts by weight: 5 parts of amino acid concentrate, 1 part of Bacillus licheniformis, 1 part of Bacillus subtilis, 3 parts of graphite powder, 23 parts of urea, 25 parts of monoammonium phosphate, 15 parts of potassium chloride, 7 parts of ammonium sulfate, 4 parts of ammonium bicarbonate, 16 parts of humic acid, 0.003 parts of magnesium sulfate, 0.0025 parts of zinc sulfate and 0.003 parts of borax.

[0008] A composite microbial fertilizer production device comprises a rotary drum granulator, a dryer, a cooler, a pulverizer, a coating machine, a film casting machine and a screening machine which are connected in sequence. The dryer comprises an outer cylinder rotatably arranged on a frame and a driving assembly for driving the outer cylinder to rotate. An inner cylinder is arranged inside the outer cylinder, and a storage cavity is arranged between the outer cylinder and the inner cylinder. The inner cylinder is provided with a cavity so that the inner cylinder is divided into an inner wall and an outer wall. A through groove is provided at the bottom of the inner cylinder. An arc-shaped carrier plate and a screen are slidably provided in the cavity. The carrier plate is used to close the through groove and carry fertilizer particles. The carrier plate is fixedly connected to the screen. The screen is connected to a vibration spring. The free end of the vibration spring is fixedly connected to the inner cylinder. A toggle assembly is also included, and the toggle assembly is used to toggle the carrier plate and the screen to rotate in the cavity.

[0009] The principle of this scheme is as follows: (1) Fertilizer is placed in the inner cylinder, and then the outer cylinder is driven to rotate by the driving assembly, thereby driving the inner cylinder to rotate, so as to dry the fertilizer. When the fertilizer is dried and shaped, the screen is driven to rotate by the toggle assembly, thereby driving the carrier plate to rotate, so that the carrier plate is away from the through-groove area at the bottom of the inner cylinder, and the screen rotates to the through-groove area at the bottom of the inner cylinder. (2) Since the screen is connected to a vibration spring, when the toggle assembly drives the carrier plate and the screen to rotate, the vibration spring will undergo elastic deformation during the rotation of the carrier plate and the screen, and the elastic potential energy of the vibration spring is converted into kinetic energy, so that the screen rotates back and forth in the through-groove area at the bottom of the inner cylinder, so that the fertilizer with unqualified particle size after drying is screened out by the rotation of the screen, and the smaller particles will fall into the storage cavity between the inner cylinder and the outer cylinder through the pores of the screen, and will be cleaned out of the dryer in the subsequent process, while the larger particles will remain above the screen, so as to grade and screen the fertilizer particles after drying.

[0010] The effects of this scheme are as follows: (1) During the granulation process of the fertilizer granulator, water needs to be added to help the bonding between the raw material components so that the particles can maintain a certain shape and strength. In the granulator, the raw materials are mixed with water to form solid particles under certain pressure and temperature conditions. In this process, water helps the bonding between the raw material components so that the particles can maintain a certain shape and strength. Therefore, the fertilizer particles just out of the granulator contain a certain amount of water and are in a wet state. The prior art (see CN106091633A, a drum-type fertilizer drying system) provides a preheating pipe on the inner wall of the drying cylinder so that the material can only be turned over slightly under the constraint of the preheating pipe, thereby avoiding excessive turning and causing fragmentation. However, during the drying process, the wet fertilizer particles will still collide with the pipe wall, especially in the early stage of preheating, when the particle surface begins to harden, this collision will still cause the particles to be damaged. (2) See CN116026113A, a granular fertilizer de-powdering device, the inner drying cylinder of the above device is a screen cylinder structure. However, since the fertilizer particles are wet at the beginning of drying, and there are edges between the meshes of the screen, during the rotation of the drying drum, the fertilizer particles will collide with the edges, resulting in cutting of the fertilizer particles, especially when the surface of the particles begins to harden while the inside remains wet. This inconsistency in the degree of dryness inside and outside will make the particles more susceptible to external forces and break. (3) In this scheme, the fertilizer is placed in the inner drum, and the outer drum is driven by the driving component to rotate and dry the fertilizer. In the early stage of drying, the inner drum and the carrier plate are enclosed to form a smooth cylindrical structure, which avoids the collision between the wet fertilizer particles and the stirring parts or the edges of the screen drum, thereby reducing the damage of the particles. (4) During the drying process, the particles will still collide with each other to produce debris. In this scheme, after the fertilizer particles are shaped, the vibration spring drives the screen to rotate back and forth in the through groove area at the bottom of the inner drum, which can screen out these debris, reducing the process of removing debris in the subsequent cooling process. Secondly, during the granulation process, fertilizer particles of unqualified particle size will be produced, and wet fertilizer particles cannot be screened. After the dryer shapes the particles, the back-and-forth rotation of the screen can screen out the fertilizer particles with unqualified particle sizes, reducing the subsequent process of screening out fertilizer particles with qualified particle sizes. Finally, the back-and-forth rotation of the screen and the carrier plate can make the fertilizer particles roll on the screen, thereby turning the fertilizer.

[0011] Furthermore, the driving assembly includes a gear ring and a motor, the gear ring is fixedly penetrated on the outer cylinder, the output end of the motor is fixedly connected with a gear, and the gear is meshed with the gear ring.

[0012] The principle and effect of this solution are: this is the existing technology, the motor drives the gear to rotate, and the gear drives the gear ring and the outer cylinder to rotate.

[0013] Furthermore, the motor is an adjustable speed motor; the toggle assembly includes a slider, a first protrusion and a second protrusion, the slider is slidably arranged in the cavity, the outer cylinder is provided with a slide groove, the slider is slidably connected to the slide groove, the slider is fixedly connected to the screen, the first protrusion is slidably arranged in the slider, a return spring is provided in the slider, one end of the return spring is connected to the slider, and the free end is connected to the first protrusion, the second protrusion is arranged on the outside of the outer cylinder, and the first protrusion and the second protrusion cooperate with each other.

[0014] The principle and effect of this scheme are as follows: in the initial stage of drying, since the fertilizer is relatively moist, the rotation speed of the outer cylinder should be slow to avoid the increase of the collision force between the fertilizer particles when the surface of the particles begins to harden while the inside remains moist, resulting in the rupture of the particles. However, due to the slow rotation speed of the outer cylinder, the centrifugal force on the first protrusion is small, and the first protrusion will not collide with the second protrusion, so that the carrier plate is in the through-slot area. In the later stage of drying, as the water inside the fertilizer particles gradually evaporates, the structure of the particles tends to be stable, and at this time, it can withstand greater collision force. Therefore, the rotation speed of the outer cylinder can be increased, mainly to accelerate the drying process of the fertilizer particles and improve the drying efficiency. By increasing the rotation speed of the outer cylinder, the turning of the fertilizer particles can be enhanced, thereby increasing the contact area between the particles and the hot air, so as to improve the drying efficiency. When the rotation speed of the outer cylinder is fast, the first protrusion is subjected to a large centrifugal force and is thrown out of the outer cylinder, and intermittently collides with the second protrusion, and after being away from the second protrusion, the screen is repeatedly rotated back and forth in the through-slot area driven by the vibration spring, thereby screening out debris and screening the fertilizer particles.

[0015] Furthermore, the first bump is made of a flexible material.

[0016] The principle and effect of this solution are to avoid the rigid collision between the first bump and the second bump, and reduce the damage of the first bump and the second bump caused by the impact force.

[0017] Furthermore, the curvature radius of the carrier plate, the screen and the slider is equal to the curvature radius of the inner cylinder; and the number of the toggle components is two symmetrically arranged groups.

[0018] The principle and effect of this solution are: (1) reducing the friction between the carrier plate, screen, slider and inner cylinder. (2) The two sets of toggle components increase the frequency of toggle the carrier plate and screen, thereby increasing the vibration frequency of the vibration spring, and then increasing the frequency of rotation of the carrier plate and screen, thus improving the screening effect.

[0019] Furthermore, the inner wall is provided with a guide groove, and the loading plate and the sliding block are both slidably connected to the guide groove; a guide rail is provided in the sliding block, and the first protrusion is slidably connected to the guide rail.

[0020] The principle and effect of this solution are as follows: This is the prior art, and the guide groove and the guide rail respectively provide positioning and guiding functions for the movement of the carrier plate, the slider and the first protrusion to avoid dislocation during the movement process.

[0021] A method for producing a composite microbial fertilizer comprises the following steps: Step S10: preparing materials, weighing 4-7 parts of amino acid concentrate, 1-2 parts of Bacillus licheniformis, 1-2 parts of Bacillus subtilis and 2-4 parts of graphite powder; Step S20: weighing materials, using an electronic weighing belt scale to weigh 20-23 parts of urea, 20-5 parts of monoammonium phosphate, 10-25 parts of potassium chloride, 5-8 parts of ammonium sulfate, 2.5-5 parts of ammonium bicarbonate, 15-20 parts of humic acid, 0.001-0.003 parts of magnesium sulfate, 0.002-0.0025 parts of zinc sulfate and 0.001-0.003 parts of borax; Step S30: granulation, sending the basic fertilizer in step S20 into a drum granulator for granulation; Step S40: drying, sending the granules obtained in step S30 into a drying machine for drying; Step S50: re-granulation, sending the unqualified fertilizer in step S40 into a pulverizer for pulverization and then returning to step S30 for re-granulation; Step S60: coating, feeding the fertilizer with qualified particle size in step S40 into a coating machine, and then spraying the amino acid concentrate evenly on the surface of the fertilizer; then feeding Bacillus licheniformis and Bacillus subtilis into the coating machine through a screw conveyor for uniform coating; finally, feeding graphite powder into the coating machine through a screw conveyor for uniform coating; Step S70: film casting, the fertilizer after step S60 is sent to a film casting machine through a bucket elevator for polishing and film casting; Step S80: Screening, sending the fertilizer after step S70 to a screening machine via a bucket elevator to screen out excess graphite powder; Step S90: Packaging, the fertilizers obtained in step S80 are sent to a finished product silo via a bucket elevator for metering and packaging.

[0022] Further, the step S40 specifically includes the following steps: Step S41: preheating, first preheating the dryer so that the temperature inside the outer drum is not less than 80°C; Step S42: drying, feeding the fertilizer into the dryer, and starting the motor to drive the outer drum to rotate, and drying the fertilizer for 2 hours; Step S43: screening materials, increasing the speed of the motor so that the first protrusion is thrown out of the outer cylinder and intermittently collides with the second protrusion, thereby causing the carrier plate and the screen to rotate back and forth, and then screening out fertilizers with qualified particle sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of the drying machine of the present invention; Figure 2 It is a schematic diagram of the state in which the carrier plate and the screen of the drying machine of the present invention rotate; Figure 3 It is the test result of the effective live bacteria count contained in the microbial agent coated inorganic fertilizer of the present invention.

[0024] The figure marks in the drawings of the specification include: dryer 1, inner drum 11, cavity 111, inner wall 112, outer wall 113, drive assembly 12, gear ring 121, motor 122, gear 123, carrier plate 13, screen 14, vibration spring 15, toggle assembly 16, slider 161, first protrusion 162, second protrusion 163, return spring 164, outer drum 17, slide groove 171, storage cavity 18. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the concept and technical effects of the present invention in combination with the embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention: Embodiment 1: The invention discloses a composite microbial fertilizer, which is prepared from the following materials in parts by weight: 4-7 parts of amino acid concentrate, 1-2 parts of bacillus licheniformis, 1-2 parts of bacillus subtilis, 2-4 parts of graphite powder, 20-23 parts of urea, 20-35 parts of monoammonium phosphate, 10-25 parts of potassium chloride, 5-8 parts of ammonium sulfate, 2.5-5 parts of ammonium bicarbonate, 15-20 parts of humic acid, 0.001-0.003 parts of magnesium sulfate, 0.002-0.0025 parts of zinc sulfate and 0.001-0.003 parts of borax.

[0026] According to NY / T 2321-2013 "Inspection Procedures for Microbial Fertilizer Products", the number of effective live bacteria contained in the prepared microbial agent-coated inorganic fertilizers after small-particle urea, 64% monoammonium phosphate, 18-18-18, 17-17-17, and 17-15-15 compound fertilizers were coated with compound bacteria agents. The results are shown in Figure 3 .

[0027] Depend on Figure 3It can be seen that after urea, monoammonium phosphate and compound fertilizer were coated with composite bacterial agents, the colony counts of the four microorganisms in the fertilizers were different. The total number of microbial colonies in the three formula compound fertilizers and urea 2 was greater than 1×106CFU / g, and the total number of bacteria in monoammonium phosphate and urea 1 was less than 1×106CFU / g. The number of Bacillus licheniformis was dominant in compound fertilizers and urea, and the number of Bacillus amyloliquefaciens was dominant in monoammonium phosphate, indicating that the salt tolerance and biological activity of these two strains were better than those of the other two strains.

[0028] The microbial agent coated inorganic fertilizer was used in agrochemical tests on potatoes, lettuce and cabbage to verify the fertilizer efficiency of the microbial agent coated inorganic fertilizer compared with the inorganic fertilizer with the same nutrients. The test was set up with each replicate area of ​​20 m2, 3 replicates per treatment, and a fertilizer application rate of 40 kg per 667 m2.

[0029] (1) The application of microbial agent coated compound fertilizers 17-17-17 and 17-15-15 on potatoes increased yields by 21.0% and 43.4% per 667 m2, respectively, compared with the conventional potato fertilizer 15-10-20. Comparing the harvest ratio of qualified bulbs to small bulbs, the proportion of small bulbs in the area where conventional potato fertilizers were applied was 23.04%, while the proportion of small bulbs in the area where microbial agent coated compound fertilizers 17-17-17 and 17-15-15 were only 16.00% and 17.70%, respectively, indicating that the qualified bulb rate increased. This indicates that the two microbial agent coated compound fertilizers can significantly increase the size of bulbs while increasing yields in potato seed potato planting.

[0030] (2) When compound microbial fertilizer was applied to lettuce, the content of protein and total sugar in lettuce was significantly increased compared with the conventional control. The increase of w (protein) was 44%~56%, and the increase of w (total sugar) was 102%~130%. The increase tended to increase with the increase of compound microbial fertilizer application.

[0031] (3) Compound microbial fertilizer was applied to cabbage, and the yield data of cabbage in each treatment were analyzed. The results showed that treatment 3 (90% dosage) increased the yield by 1.56 tons per hectare compared with the control, with an increase rate of 2.94%; the number of commercial cabbage heads in the plot increased by 2 compared with the control, with an increase rate of 2.47%. Through input-output ratio analysis, the net income of treatment 2 (100% dosage) and treatment 3 (90% dosage) increased by 30.52% and 43.99% respectively compared with the control, and the output-input ratio reached 2.32 and 3.56 respectively. This shows that the compound microbial fertilizer can significantly increase the comprehensive income of farmers.

[0032] Embodiment 2: See also Figure 1 and Figure 2A composite microbial fertilizer production device includes a drum granulator, a dryer 1, a cooler, a pulverizer, a coating machine, a film casting machine and a screening machine connected in sequence (some of the above devices are not shown), the dryer 1 includes an outer cylinder 17 rotatably arranged on a frame and a driving assembly 12 for driving the outer cylinder 17 to rotate, the driving assembly 12 includes a gear ring 121 and a motor 122, the gear ring 121 is fixedly penetrated on the outer cylinder 17, the output end of the motor 122 is fixedly connected with a gear 123, the gear 123 is meshed with the gear ring 121, the motor 122 adopts a PID servo motor, and is electrically connected to a PID controller.

[0033] An inner cylinder 11 concentric with the outer cylinder 17 is provided inside the outer cylinder 17, and a cavity 111 is opened in the inner cylinder 11, so that the inner cylinder 11 is divided into an inner wall 112 and an outer wall 113. A through groove is provided at the bottom of the inner cylinder 11, and an arc-shaped carrier plate 13 and a screen 14 are slidably provided in the cavity 111. The curvature radius of the carrier plate 13 and the screen 14 is equal to the curvature radius of the inner cylinder 11 to reduce the friction between the carrier plate 13, the screen 14 and the inner cylinder 11. The carrier plate 13 is used to close the through groove and carry fertilizer particles. One end of the carrier plate 13 is fixedly connected to one end of the screen 14, and the other end of the screen 14 is fixedly connected to a vibration spring 15, and the free end of the vibration spring 15 is fixedly connected to the inner cylinder 11; it also includes a toggle assembly 16, which includes a slider 161, a first protrusion 162 and a second protrusion 163, and the slider 161 is slidably arranged on In the cavity 111, the outer cylinder 17 is provided with a slide groove 171, the slider 161 is slidably connected to the slide groove 171, the slider 161 is fixedly connected to the screen 14, the first protrusion 162 is slidably arranged in the slider 161, and a return spring 164 is arranged in the slider 161, one end of the return spring 164 is connected to the slider 161, and the free end is connected to the first protrusion 162, the second protrusion 163 is arranged on the outside of the outer cylinder 17, and the second protrusion 163 is supported and fixed by a supporting device such as a frame. The first protrusion 162 is thrown out of the outer cylinder 17 by a large centrifugal force, so as to cooperate with the second protrusion 163. The first protrusion 162 is made of rubber material to avoid rigid collision between the first protrusion 162 and the second protrusion 163, thereby reducing damage to the first protrusion 162 and the second protrusion 163 caused by the impact force.

[0034] The specific working conditions are as follows: put the fertilizer into the inner cylinder 11, and then drive the outer cylinder 17 to rotate through the motor 122, thereby driving the inner cylinder 11 to rotate, so as to dry the fertilizer. When the fertilizer is dried and shaped, it can withstand greater collision force. Therefore, the rotation speed of the outer cylinder 17 can be increased, mainly to accelerate the drying process of the fertilizer particles and improve the drying efficiency. By increasing the rotation speed of the outer cylinder 17, the turning of the fertilizer particles can be enhanced, thereby increasing the contact area between the particles and the hot air to improve the drying efficiency. When the rotation speed of the outer cylinder 17 is fast, the first protrusion 162 is subjected to a large centrifugal force and is thrown out of the outer cylinder 17, and intermittently collides with the second protrusion 163, and after being away from the second protrusion 163, the carrier plate 13 is driven by the vibration spring 15 to move away from the through-groove area at the bottom of the inner cylinder 11, and the screen 14 rotates to the through-groove area at the bottom of the inner cylinder. At the same time, since the screen 14 is connected to the vibration spring 15, the vibration spring 15 will undergo elastic deformation during the rotation of the carrier plate 13 and the screen 14, and the elastic potential energy of the vibration spring 15 is converted into kinetic energy, so that the screen 14 rotates back and forth in the through groove area at the bottom of the inner cylinder 11, so that the fertilizer with unqualified particle size after drying can be screened out through the rotation of the screen 14, and smaller particles will fall into the storage cavity 18 between the inner cylinder and the outer cylinder 17 through the pores of the screen 14, and will be cleaned out of the dryer 1 in subsequent processes, while larger particles will remain above the screen 14, so that the dried fertilizer particles can be graded and screened out of debris.

[0035] In order to better realize the above device, the present invention also provides a method for producing a composite microbial fertilizer, including applying a composite microbial fertilizer production device, comprising the following steps: Step S10: preparing materials, weighing 4-7 parts of amino acid concentrate, 1-2 parts of Bacillus licheniformis, 1-2 parts of Bacillus subtilis and 2-4 parts of graphite powder; Step S20: weighing materials, using an electronic weighing belt scale to weigh 20-23 parts of urea, 20-5 parts of monoammonium phosphate, 10-25 parts of potassium chloride, 5-8 parts of ammonium sulfate, 2.5-5 parts of ammonium bicarbonate, 15-20 parts of humic acid, 0.001-0.003 parts of magnesium sulfate, 0.002-0.0025 parts of zinc sulfate and 0.001-0.003 parts of borax; Step S30: granulation, sending the basic fertilizer in step S20 into a drum granulator for granulation; Step S40: drying, sending the granules obtained in step S30 into the dryer 1 for drying; Step S50: re-granulation, sending the unqualified fertilizer in step S40 into a pulverizer for pulverization and then returning to step S30 for re-granulation; Step S60: coating, feeding the fertilizer with qualified particle size in step S40 into a coating machine, and then spraying the amino acid concentrate evenly on the surface of the fertilizer; then feeding Bacillus licheniformis and Bacillus subtilis into the coating machine through a screw conveyor for uniform coating; finally, feeding graphite powder into the coating machine through a screw conveyor for uniform coating; Step S70: film casting, the fertilizer after step S60 is sent to a film casting machine through a bucket elevator for polishing and film casting; Step S80: Screening, sending the fertilizer after step S70 to a screening machine via a bucket elevator to screen out excess graphite powder; Step S90: Packaging, the fertilizers obtained in step S80 are sent to a finished product silo via a bucket elevator for metering and packaging.

[0036] Further, step S40 specifically includes the following steps: Step S41: preheating, first preheating the dryer 1 so that the temperature in the inner drum 11 is not less than 80°C; Step S42: drying, feeding the fertilizer into the dryer 1, and starting the motor 12 to drive the inner drum 11 to rotate, and drying the fertilizer for 2 hours; Step S43: screening materials, increasing the speed of the motor 122, so that the first protrusion 162 is thrown out of the inner cylinder 11 and intermittently collides with the second protrusion 163, so that the carrier plate 13 and the screen 14 rotate back and forth, and then the fertilizer with a qualified particle size is screened out.

[0037] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A composite microbial fertilizer, characterized in that: The composite microbial fertilizer is made of the following materials in parts by weight: 4-7 parts of amino acid concentrate, 1-2 parts of Bacillus licheniformis, 1-2 parts of Bacillus subtilis, 2-4 parts of graphite powder, 20-23 parts of urea, 20-35 parts of monoammonium phosphate, 10-25 parts of potassium chloride, 5-8 parts of ammonium sulfate, 2.5-5 parts of ammonium bicarbonate, 15-20 parts of humic acid, 0.001-0.003 parts of magnesium sulfate, 0.002-0.0025 parts of zinc sulfate and 0.001-0.003 parts of borax.

2. A composite microbial fertilizer according to claim 1, characterized in that: The composite microbial fertilizer is made of the following materials in parts by weight: 5 parts of amino acid concentrate, 1 part of Bacillus licheniformis, 1 part of Bacillus subtilis, 3 parts of graphite powder, 23 parts of urea, 25 parts of monoammonium phosphate, 15 parts of potassium chloride, 7 parts of ammonium sulfate, 4 parts of ammonium bicarbonate, 16 parts of humic acid, 0.003 parts of magnesium sulfate, 0.0025 parts of zinc sulfate and 0.003 parts of borax.

3. A composite microbial fertilizer production device, comprising a rotary drum granulator, a dryer (1), a cooler, a pulverizer, a coating machine, a film casting machine and a screening machine connected in sequence, the dryer (1) comprising an outer cylinder (17) rotatably arranged on a frame and a driving assembly (12) for driving the outer cylinder (17) to rotate, an inner cylinder (11) being arranged inside the outer cylinder (17), and a storage cavity (18) being arranged between the outer cylinder (17) and the inner cylinder (11), characterized in that: The inner cylinder (11) is provided with a cavity (111), so that the inner cylinder (11) is divided into an inner wall (112) and an outer wall (113); a through groove is provided at the bottom of the inner cylinder (11); an arc-shaped loading plate (13) and a screen (14) are slidably provided in the cavity (111); the loading plate (13) is used to close the through groove and carry fertilizer particles; the loading plate (13) is fixedly connected to the screen (14); the screen (14) is connected to a vibration spring (15); the free end of the vibration spring (15) is fixedly connected to the inner cylinder (11); and a toggle assembly (16) is further provided, the toggle assembly (16) being used to toggle the loading plate (13) and the screen (14) to rotate in the cavity (111).

4. A composite microbial fertilizer production device according to claim 3, characterized in that: The driving assembly (12) comprises a gear ring (121) and a motor (122); the gear ring (121) is fixedly mounted on the outer cylinder (17); an output end of the motor (122) is fixedly connected to a gear (123); and the gear (123) is meshed with the gear ring (121).

5. A composite microbial fertilizer production device according to claim 3, characterized in that: The motor (122) is an adjustable speed motor (122); the toggle assembly (16) comprises a slider (161), a first protrusion (162) and a second protrusion (163); the slider (161) is slidably disposed in the cavity (111); the outer cylinder (17) is provided with a slide groove (171); the slider (161) is slidably connected to the slide groove (171); the slider (161) is fixedly connected to the screen (14); the first protrusion (162) is slidably disposed in the slider (161); a return spring (164) is provided in the slider (161); one end of the return spring (164) is connected to the slider (161), and a free end is connected to the first protrusion (162); the second protrusion (163) is disposed on the outer side of the outer cylinder (17); the first protrusion (162) and the second protrusion (163) cooperate with each other.

6. A composite microbial fertilizer production device according to claim 5, characterized in that: The first protrusion (162) is a first protrusion (162) made of a flexible material.

7. A composite microbial fertilizer production device according to claim 5, characterized in that: The curvature radius of the object carrier plate (13), the screen (14) and the slider (161) is equal to the curvature radius of the inner cylinder (11); and the number of the toggle components (16) is two groups which are symmetrically arranged.

8. A composite microbial fertilizer production device according to claim 3, characterized in that: The inner wall (112) is provided with a guide groove, and the object carrier (13) and the sliding block (161) are both slidably connected to the guide groove; a guide rail is provided inside the sliding block (161), and the first protrusion (162) is slidably connected to the guide rail.

9. A method for producing a composite microbial fertilizer, characterized in that: The steps include: Step S10: preparing materials, weighing 4-7 parts of amino acid concentrate, 1-2 parts of Bacillus licheniformis, 1-2 parts of Bacillus subtilis and 2-4 parts of graphite powder; Step S20: weighing materials, using an electronic weighing belt scale to weigh 20-23 parts of urea, 20-5 parts of monoammonium phosphate, 10-25 parts of potassium chloride, 5-8 parts of ammonium sulfate, 2.5-5 parts of ammonium bicarbonate, 15-20 parts of humic acid, 0.001-0.003 parts of magnesium sulfate, 0.002-0.0025 parts of zinc sulfate and 0.001-0.003 parts of borax; Step S30: granulation, sending the basic fertilizer in step S20 into a drum granulator for granulation; Step S40: drying, sending the granules obtained in step S30 into a drying machine (1) for drying; Step S50: re-granulation, sending the unqualified fertilizer in step S40 into a pulverizer for pulverization and then returning to step S30 for re-granulation; Step S60: coating, feeding the fertilizer with qualified particle size in step S40 into a coating machine, and then spraying the amino acid concentrate evenly on the surface of the fertilizer; then feeding Bacillus licheniformis and Bacillus subtilis into the coating machine through a screw conveyor for uniform coating; finally, feeding graphite powder into the coating machine through a screw conveyor for uniform coating; Step S70: film casting, the fertilizer after step S60 is sent to a film casting machine through a bucket elevator for polishing and film casting; Step S80: Screening, sending the fertilizer after step S70 to a screening machine via a bucket elevator to screen out excess graphite powder; Step S90: Packaging, the fertilizers obtained in step S80 are sent to a finished product silo via a bucket elevator for metering and packaging.

10. A method for producing a composite microbial fertilizer according to claim 9, comprising using a composite microbial fertilizer production device according to claims 3-8, characterized in that: The step S40 specifically includes the following steps: Step S41: preheating, first preheating the dryer (1) so that the temperature inside the inner drum (11) is not less than 80°C; Step S42: drying, feeding the fertilizer into the drying machine (1), and starting the motor (12) to drive the inner drum (11) to rotate, and drying the fertilizer for 2 hours; Step S43: screening the material, increasing the rotation speed of the motor (122) so that the first protrusion (162) is thrown out of the inner cylinder (11) and intermittently collides with the second protrusion (163), thereby causing the carrier plate (13) and the screen (14) to rotate back and forth, thereby screening out fertilizer with a qualified particle size.

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