Preparation method of activated compound microbial fertilizer

Abstract

The invention discloses a preparation method of an activated compound microbial fertilizer, and particularly relates to the field of fertilizer preparation, and the preparation method comprises the following steps: preparing bacillus subtilis powder and nitrifying bacteria powder according to a design proportion; feeding the prepared bacillus subtilis powder and nitrobacteria powder into a compound microbial fertilizer preparation device; starting an air inlet system, and introducing hot air into the compound microbial fertilizer preparation device, so that mixed powder of bacillus subtilis powder and nitrifying bacteria powder in the device is in a boiling state; starting an adhesive spraying unit, and spraying atomized adhesive liquid drops into the powder in the boiling state; spraying the adhesive again and adding nitrifying bacteria powder to ensure that the surface of each fertilizer preparation is uniformly coated with a layer of nitrifying bacteria. By preparing the fertilizer preparation particles with the three-layer coating structure, the survival rate of bacillus subtilis is increased, and meanwhile, the structure is also beneficial to maintaining the overall stability and long-term activity of the fertilizer preparation.

Description

Technical Field

[0001] The present invention relates to the technical field of fertilizer preparation, and more specifically, to a method for preparing an activated composite microbial fertilizer. Background Art

[0002] Fertilizers for improving water quality for fisheries are preparations made by mixing two or more microorganisms, including at least Bacillus subtilis (which has a significant degradation effect on pond ammonia nitrogen, nitrite nitrogen, sulfide and organic matter, can effectively improve the environment of breeding ponds, reduce the amount of toxic and harmful substances in ponds, and is non-toxic and pathogenic to fish, and can effectively improve breeding efficiency) and alkaline nitrifying bacteria.

[0003] However, the existing production and processing technology of the fertilizer preparation is to simply mix Bacillus subtilis and nitrifying bacteria in proportion, and the final state is still in powder form. When it is used as a fishery fertilizer and released into the water, the powdered fishery fertilizer preparation cannot reach the deep water, thereby reducing the improvement effect on the deep water quality. Summary of the invention

[0004] The present invention provides an activated composite microbial fertilizer preparation method, and aims to solve the problem that the composite microbial fertilizer preparation method in the existing related technology cannot prepare a multi-layer granular microbial fertilizer preparation.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for preparing an activated composite microbial fertilizer, comprising the following steps:

[0006] Step 101, preparing Bacillus subtilis powder and nitrifying bacteria powder according to a designed ratio;

[0007] Step 102, feeding the prepared Bacillus subtilis powder and nitrifying bacteria powder into a composite microbial fertilizer preparation device;

[0008] Step 103, opening the air inlet system of the composite microbial fertilizer preparation device to introduce hot air into the composite microbial fertilizer preparation device, so that the mixed powder of the Bacillus subtilis powder and the nitrifying bacteria powder inside is in a boiling state;

[0009] Step 104, starting the binder spraying unit of the composite microbial fertilizer preparation device to spray atomized binder droplets into the powder in a boiling state;

[0010] Step 105, sucking the initially formed particles into the coating channel of the composite microbial fertilizer preparation device through the suction pump of the composite microbial fertilizer preparation device, during which the binder is sprayed again and nitrifying bacteria powder is added to ensure that the surface of each fertilizer preparation is evenly coated with a layer of nitrifying bacteria;

[0011] In step 106, the fertilizer preparation after being processed in the wrapping channel will return to the composite microbial fertilizer preparation device and continue to be acted upon by hot air, so that the adhesive in the middle layer is dried and the nitrifying bacteria in the outer layer of the preparation are fixed, thereby forming a three-layer granular fertilizer preparation with an inner layer of Bacillus subtilis powder, a middle layer of adhesive, and an outer layer of nitrifying bacteria powder.

[0012] In a preferred embodiment, the composite microbial fertilizer preparation device includes a raw material container, and in step 102, Bacillus subtilis powder and nitrifying bacteria powder are added into the raw material container from a raw material inlet of the raw material container;

[0013] The air intake system includes a blower, an air heating box and an air intake pipe. In step 103, the blower blows air into the air heating box, where the air is heated by the internal heating wire, and then blown into the raw material container from the bottom of the raw material container through the air intake pipe, so that the hot air entering the raw material container passes through the isolation diverter plate to form a circulation inside the raw material container, thereby making the mixture of Bacillus subtilis powder and nitrifying bacteria powder inside present a boiling state;

[0014] The adhesive spraying unit includes a peristaltic pump 1, an adhesive source and a spray gun 1. In step 104, the peristaltic pump 1 sucks out the adhesive source stored in the adhesive source and sprays it into the raw material container through the spray gun 1.

[0015] In a preferred embodiment, a first filter plate is installed inside the air heating box so that the air blown in from the blower and heated by the air heating box is filtered and purified by the first filter plate before entering the raw material container to remove impurities and particulate matter in the air.

[0016] In a preferred embodiment, in step 104, a coating liquid is also added to the mixed powder in a boiling state;

[0017] The composite microbial fertilizer preparation device comprises a coating liquid spray unit, which comprises a peristaltic pump 2, a coating liquid source and a spray gun 2; adding the coating liquid to the mixed powder in a boiling state comprises the following steps:

[0018] Step 1: preparing an ethyl cellulose solution as a coating solution and placing it in a coating solution source;

[0019] Step 2: extracting the coating liquid from the coating liquid source through the peristaltic pump 2 and delivering it to the spray gun 2;

[0020] Step 3: Install a coating liquid spray unit on the top of the inner cavity of the raw material container, and use a spray gun to spray the atomized ethyl cellulose solution onto the granular fertilizer preparation in the raw material container so that the surface of the particles is evenly covered with a layer of coating liquid.

[0021] In a preferred embodiment, the wrapping channel includes a channel tube, a feed hopper, a discharge hopper and a suction pump. The suction force generated by the suction pump is used to suck the granular fertilizer preparation in the raw material container into the channel tube through the feed hopper, and then discharged back into the raw material container through the discharge hopper.

[0022] In a preferred embodiment, the wrapping channel is composed of channel 1, channel 2 and channel 3 which are continuous from top to bottom. The particles are sucked from the raw material container into the channel tube by the action of a suction pump, and are discharged back to the raw material container after being processed.

[0023] In step 105, the steps of spraying the binder and adding nitrifying bacteria powder include:

[0024] Step 1, adding adhesive: an adhesive pipeline is arranged on the pipe wall of channel 1, the pipeline is connected to an adhesive source, and the adhesive is introduced into channel 1 through a pumping system, so that the surface of the granular fertilizer preparation entering channel 1 is covered with a layer of adhesive;

[0025] Step 2, adding nitrifying bacteria powder: a nitrifying bacteria powder pipeline is set on the wall of channel three, the pipeline is connected to the nitrifying bacteria powder source, and the nitrifying bacteria powder is introduced into channel three through a pumping system, so that the particles already covered with the adhesive are further coated with a layer of nitrifying bacteria powder.

[0026] In a preferred embodiment, a second filter plate is installed on the inner wall of the second channel. The filter plate is located before the suction pump and is used to prevent particles from the raw material container from entering the suction pump.

[0027] In a preferred embodiment, a baffle plate that moves up and down is installed inside the raw material container, and the baffle plate is used to close the feed hopper when the wrapping channel is not in use.

[0028] In a preferred embodiment, a driving member is installed on the top of the baffle plate, and the driving member is used to control the baffle plate to move up and down along the slide groove on the inner wall of the raw material container, thereby opening and closing the feed hopper, and expansion covers are installed on the outside of the feed hopper and the discharge hopper.

[0029] In a preferred embodiment, the composite microbial fertilizer preparation device includes an exhaust dust removal system, which includes a plurality of filter bags installed between the top of the raw material container and the exhaust pipe. The filter bags are driven by the reciprocating motion of the cylinder to perform compression and release operations, so that the filter bags can periodically clean the dust attached to their surface, thereby shaking off the accumulated dust back into the raw material container.

[0030] Technical effects and advantages of the present invention:

[0031] 1. The method for preparing a fertilizer preparation of the present invention prepares fertilizer preparation particles with a three-layer coating structure, wherein the nitrifying bacteria are wrapped in the outer layer of Bacillus subtilis, thereby avoiding the inactivation problem caused by direct contact with the external environment during application of the fertilizer preparation, thereby improving the survival rate of Bacillus subtilis. At the same time, this structure also helps to maintain the overall stability and long-term activity of the fertilizer preparation.

[0032] 2. The Bacillus subtilis in the fertilizer preparation of the present invention has a significant degradation effect on pond ammonia nitrogen, nitrite nitrogen, sulfide and organic matter, and is non-toxic and non-pathogenic to fish. Therefore, the granular microbial fertilizer preparation can more effectively improve the aquaculture water environment, reduce the amount of toxic and harmful substances, and improve aquaculture efficiency.

[0033] 3. The preparation device of the present invention realizes the automated processing of the microbial fertilizer preparation of Bacillus subtilis and nitrifying bacteria with a three-layer coating structure, and the nitrifying bacteria are wrapped in the outer layer of Bacillus subtilis, which is beneficial to improve the survival rate of Bacillus subtilis. The repeated cycle processing method allows each granular preparation surface to be evenly coated with a nitrifying bacteria layer with a high survival rate and little impact, thereby avoiding Bacillus subtilis from being inactivated by direct contact with the external environment and being affected, thereby reducing the water quality improvement effect of Bacillus subtilis. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a flow chart of the preparation method.

[0035] Figure 2 It is a three-dimensional structural schematic diagram of the activated composite microbial fertilizer preparation device of the present invention.

[0036] Figure 3 The present invention Figure 2 Schematic diagram of the front cross-sectional structure.

[0037] Figure 4 The present invention Figure 2 Schematic diagram of the side cross-sectional structure.

[0038] Figure 5 The present invention Figure 4 A schematic diagram of the structure of another state.

[0039] Figure 6 It is a schematic diagram of the three-dimensional structure of the wrapping channel of the present invention.

[0040] Figure 7 It is a side structural schematic diagram of the wrapping channel of the present invention.

[0041] Figure 8 The present invention Figure 7 Schematic diagram of the structure from the AA perspective.

[0042] In the figure: 1. raw material container; 11. support frame; 12. exhaust pipe; 13. sealing ring; 14. conical cylinder; 15. filter bag; 2. air inlet system; 21. blower; 22. air heating box; 221. first filter plate; 23. air inlet pipe; 24. control panel; 3. adhesive spray unit; 4. coating liquid spray unit; 5. wrapping channel; 51. channel pipe; 511. channel one; 512. channel two; 513. channel three; 52. feed hopper; 53. discharge hopper; 54. suction pump; 541. second filter plate; 55. adhesive pipeline; 56. nitrifying bacteria powder pipeline; 57. expansion mask; 6. blocking plate; 61. chute. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0044] Example

[0045] Refer to the instruction manual Figure 1 , a method for preparing an activated composite microbial fertilizer, comprising the following steps:

[0046] Step 101, preparing Bacillus subtilis powder and nitrifying bacteria powder according to a designed ratio;

[0047] Step 102, feeding the prepared Bacillus subtilis powder and nitrifying bacteria powder into a composite microbial fertilizer preparation device;

[0048] Step 103, opening the air inlet system of the composite microbial fertilizer preparation device to introduce hot air into the composite microbial fertilizer preparation device, so that the mixed powder of the Bacillus subtilis powder and the nitrifying bacteria powder inside is in a boiling state;

[0049] It should be noted that the boiling state of the mixed powder refers to the phenomenon that after hot air is introduced into the mixed powder, the powder continuously surges upward, and in this "boiling state", the temperature in the composite microbial fertilizer preparation device is maintained at no more than 30 degrees Celsius to prevent the inactivation of Bacillus subtilis;

[0050] Step 104, starting the binder spraying unit of the composite microbial fertilizer preparation device to spray atomized binder droplets into the powder in a boiling state;

[0051] It should be noted that these binder droplets are mixed with powder to form a granular fertilizer preparation;

[0052] Step 105, sucking the initially formed particles into the coating channel of the composite microbial fertilizer preparation device through the suction pump of the composite microbial fertilizer preparation device, during which the binder is sprayed again and nitrifying bacteria powder is added to ensure that the surface of each fertilizer preparation is evenly coated with a layer of nitrifying bacteria;

[0053] In step 106, the fertilizer preparation after being processed in the wrapping channel will return to the composite microbial fertilizer preparation device and continue to be acted upon by hot air, so that the adhesive in the middle layer is dried and the nitrifying bacteria in the outer layer of the preparation are fixed, thereby forming a three-layer granular fertilizer preparation with an inner layer of Bacillus subtilis powder, a middle layer of adhesive, and an outer layer of nitrifying bacteria powder.

[0054] In one embodiment of the present invention, Figure 2-Figure 8 As shown, an activated composite microbial fertilizer preparation device used in an activated composite microbial fertilizer preparation method comprises a raw material container 1, a raw material inlet is penetrated through one side of the raw material container 1, the bottom of the raw material container 1 is connected with an air intake system 2, and an isolation diverter plate is installed between the raw material container 1 and the air intake system 2, the isolation diverter plate is used to form a circulation in the raw material container 1 with the air sent into the raw material container 1 by the air intake system 2, and the top of the raw material container 1 is connected with an exhaust dust removal system;

[0055] The air inlet system 2 includes a blower 21, an air heating box 22 is installed at the output end of the blower 21, a heating wire is installed inside the air heating box 22, an air inlet pipe 23 is installed at the end of the air heating box 22 away from the blower 21, and the end of the air inlet pipe 23 away from the air heating box 22 is connected to the bottom of the raw material container 1;

[0056] An adhesive spray unit 3 for spraying adhesive is installed at the top of the inner cavity of the raw material container 1. The adhesive spray unit 3 includes a peristaltic pump 1 and an adhesive source. The input end of the peristaltic pump 1 is connected to the adhesive source, and a spray gun 1 is installed at the output end of the peristaltic pump 1. The spray gun 1 is used to spray atomized adhesive into the raw material container 1.

[0057] It should be noted that the raw material inlet is used to pass Bacillus subtilis powder and nitrifying bacteria powder into the raw material container 1. Either a mixed powder of the two or one of the two powders can be passed in; the raw material container 1 is installed on the support frame 11, and a control panel 24 is installed on one side of the air heating box 22 for adjusting the operating parameters of the equipment; the isolation diverter plate is a plate-like step with multiple holes on the surface, and the size of the holes will not allow Bacillus subtilis powder to pass through.

[0058] It should be further explained that the boiling state is a state in which the bacterial powder or particles are agitated up and down under the wind force entering the raw material container 1, and the temperature in the raw material container 1 in the boiling state does not exceed 30 degrees Celsius.

[0059] In this embodiment, the implementation scenario is specifically as follows: first, a mixed powder of Bacillus subtilis powder and nitrifying bacteria powder in a suitable proportion needs to be prepared, and the pre-treated mixed powder is sent to the raw material inlet through a conveying device, such as a belt conveyor, a screw conveyor, etc., and then the mixed powder is allowed to enter the raw material container 1. The air entry and temperature adjustment in the air intake system 2 are adjusted through the control panel 24, so that the mixed powder is boiled and dried within the set temperature range to ensure that the temperature in the raw material container 1 does not exceed 30 degrees Celsius to avoid inactivation of Bacillus subtilis due to excessive temperature. Then, atomized adhesive droplets are sprayed into the raw material container 1 through the adhesive spray unit 3, and the adhesive droplets are mixed with the mixed powder in a boiling state. The boiling mixed powder is replaced and heated with the hot air, so that the fluidized mixed powder is mixed with the adhesive to form a granular preparation; the granular fertilizer preparation can prolong the retention time in the water when used as a water quality improver. After the water quality improver is put into the water area, it can further support it to reach the corresponding position, achieve precise improvement, and avoid the Bacillus subtilis in the delivery area from being integrated into the water before reaching the designated position in the deep water area.

[0060] A conical cylinder 14 is detachably mounted on the bottom of the raw material container 1 , a sealing ring 13 is mounted between the conical cylinder 14 and the bottom of the raw material container 1 , and the end of the air inlet pipe 23 away from the air heating box 22 is connected to the conical cylinder 14 .

[0061] A first filter plate 221 is installed inside the air heating box 22 , and the first filter plate 221 is used to filter and purify the air entering the raw material container 1 .

[0062] A coating liquid spray unit 4 for spraying coating liquid is installed at the top of the inner cavity of the raw material container 1. The coating liquid spray unit 4 includes a peristaltic pump 2 and a coating liquid source. The input end of the peristaltic pump 2 is connected to the coating liquid source. A spray gun 2 is installed at the output end of the peristaltic pump 2. The spray gun 2 is used to spray atomized coating liquid into the raw material container 1, and the coating liquid is an ethyl cellulose solution.

[0063] It should be noted that after the granular preparation of the above-mentioned mixed powder is obtained, the equipment of the present invention is continued to be started, so that the above-mentioned granular preparation continues to boil in the raw material container 1 to form a fluidized state, and then the ethyl cellulose solution is sprayed onto the particles through the coating liquid spray unit 4, so that the ethyl cellulose solution is coated on the surface of the particles, and as the boiling and fluidized particles are replaced and heated by the hot air, the ethyl cellulose solution forms a coating on the surface of the granular preparation, thereby protecting the surface of the granular preparation, further prolonging the melting speed of the granular preparation after being put into water, and ensuring that the granular preparation can accurately act on the deep water area.

[0064] It should be further explained that the temperature in the raw material container 1 during the coating process is controlled between 20 degrees Celsius and 30 degrees Celsius.

[0065] In another embodiment of the present invention, different from the above embodiment, this embodiment provides a method of not using ethyl cellulose solution to form a coating on the surface of the granule preparation, which solves the technical problem that during the drying process of the ethyl cellulose solution in the fertilizer preparation, the aqueous solution is evaporated, the hydroxide concentration in the ethyl cellulose aqueous solution increases, and then the pH value on the surface of the drug particles increases to even exceed 8. When the pH value is higher than 8, more than 40% of the Bacillus subtilis components will be inactivated, thereby greatly reducing the number of Bacillus subtilis in the final microbial tablet. A wrapping channel 5 is installed on the outside of the raw material container 1, and the wrapping channel 5 includes a channel tube 51, a feed hopper 52 and a discharge hopper 53. The feed hopper 52 and the discharge hopper 53 are respectively fixedly connected to the two ends of the channel tube 51, and the feed hopper 52 and the discharge hopper 53 are both embedded on the outer wall of the raw material container 1 and communicated with the inside of the raw material container 1. A suction pump 54 is installed outside the raw material container 1, and the input end of the suction pump 54 is communicated with the channel tube 51. The suction pump 54 sucks the particles in the raw material container 1 from the feed hopper 52 into the channel tube 51, and discharges them from the discharge hopper 53 into the raw material container 1.

[0066] The channel tube 51 is composed of channel one 511, channel two 512 and channel three 513 from top to bottom. The end of channel one 511 is connected to the feed hopper 52, the end of channel three 513 is connected to the discharge hopper 53, the input end of the suction pump 54 is connected to channel two 512, the tube wall of channel one 511 is also connected to a binder pipeline 55, the tube wall of channel three 513 is also connected to a nitrifying bacteria powder pipeline 56, the binder pipeline 55 is connected to a binder source for pumping the binder into the channel tube 51, the nitrifying bacteria powder pipeline 56 is connected to a nitrifying bacteria powder source for pumping the nitrifying bacteria powder into the channel tube 51.

[0067] A second filter plate 541 is fixedly mounted on the inner wall of the second channel 512 . The second filter plate 541 is used to prevent particles in the raw material container 1 from entering the suction pump 54 .

[0068] In this embodiment, the implementation scenario is specifically as follows: first, suitable Bacillus subtilis powder needs to be prepared, and the Bacillus subtilis powder is put into the raw material container 1, so that the Bacillus subtilis powder boils in the raw material container 1, and then the adhesive spray unit 3 sprays atomized adhesive droplets into the raw material container 1, and the adhesive droplets are mixed with the boiling Bacillus subtilis powder to form a viscous state, and the boiling Bacillus subtilis powder is replaced and heated by hot air, so that the fluidized Bacillus subtilis powder is mixed with the adhesive to form a granular state. After the first set boiling time is over, the Bacillus subtilis powder in the raw material container 1 forms a granular Bacillus subtilis preparation; then the suction pump 54 is intermittently turned on to draw the granular Bacillus subtilis preparation in the boiling fluidized state in the raw material container 1 into the feed hopper 52 (after the preparation is drawn into the feed hopper 52, the suction pump 54 is stopped to allow the preparation to be naturally discharged from the discharge hopper 53 under the action of gravity, and then the suction pump 54 is turned on again to allow a new batch of preparations to enter the discharge hopper 53 ), and at the same time, the adhesive and nitrifying bacteria powder are sprayed into the channel 1 511 and the channel 3 513 through the adhesive pipeline 55 and the nitrifying bacteria powder pipeline 56 respectively. That is to say, the Bacillus subtilis preparation first passes through the channel 1 511 and contacts with the sprayed atomized adhesive in the channel 1 511, so that the surface of the Bacillus subtilis preparation is coated with a new layer of adhesive. After the preparation enters the channel 3 513, the preparation contacts with the sprayed nitrifying bacteria powder, and the adhesive on its surface adheres to the nitrifying bacteria powder, thereby forming The three-layer granular preparation is formed with an inner layer of Bacillus subtilis powder, a middle layer of adhesive, and an outer layer of nitrifying bacteria powder. After the three-layer preparation is discharged from the discharge hopper 53, the hot air input from the air inlet system 2 dries the adhesive in the middle layer, thereby forming a uniformly coated three-layer granular fertilizer preparation. This not only solves the problem of Bacillus subtilis inactivation caused by the increase of pH value on the surface of the preparation due to drying of the coating liquid, but also ensures the three-layer coating structure of the fertilizer preparation, which is conducive to allowing Bacillus subtilis to accurately reach the depth of the water area.

[0069] The equipment of the present invention realizes the automatic processing of the mixed fertilizer preparation of Bacillus subtilis and nitrifying bacteria with a three-layer coating structure, and the nitrifying bacteria are wrapped in the outer layer of Bacillus subtilis, which is beneficial to improving the survival rate of Bacillus subtilis. The repeated cycle processing method enables the surface of each granular preparation to be evenly coated with a nitrifying bacteria layer with a high survival rate and little impact, thereby avoiding the inactivation of Bacillus subtilis due to direct contact with the external environment and being affected, thereby reducing the water quality improvement effect of Bacillus subtilis. Specifically, the water quality improvement effect of Bacillus subtilis can refer to the patent document with application number CN200410101021.9.

[0070] The water quality improver processed by the equipment of the present invention has an obvious degradation effect on ammonia nitrogen, nitrite nitrogen, sulfide and organic matter in the pond, can effectively improve the environment of the breeding pond, reduce the amount of toxic and harmful substances in the pond, and is non-toxic and pathogenic to fish, which can effectively improve the breeding efficiency. The preparation of the present invention is a granular solid dosage form, which is conducive to storage, packaging and transportation.

[0071] A baffle plate 6 that moves up and down is installed inside the raw material container 1 . The baffle plate 6 is matched with the feed hopper 52 and is used to close the feed hopper 52 . The height of the feed hopper 52 is matched with the diameter of the preparation to be processed in the raw material container 1 .

[0072] It should be noted that when the wrapping channel 5 is not in use, the blocking plate 6 is used to block the feed hopper 52 to prevent the granular preparation in the raw material container 1 from entering the wrapping channel 5 .

[0073] It should be noted that the height limit of the feed hopper 52 can only pass one granular preparation, ensuring that when a single granular preparation moves in the wrapping channel 5, the nitrifying bacteria powder is in full contact with the single particle, thereby avoiding the problem that multiple particles sticking together enter the wrapping channel 5 and the nitrifying bacteria powder cannot be fully wrapped on the surface of the Bacillus subtilis particles.

[0074] A slide groove 61 is provided on the inner wall of the raw material container 1, and the blocking plate 6 is slidably arranged in the slide groove 61. A driving member is installed on the top of the blocking plate 6 to drive the blocking plate 6 to move along the slide groove 61. Expansion covers 57 are installed on the outer sides of the feed hopper 52 and the discharge hopper 53 to facilitate the suction pump 54 to suck the particles in the raw material container 1 into the wrapping channel 5.

[0075] It should be noted that the driving member is a cylinder.

[0076] A plurality of filter bags 15 are installed between the top of the raw material container 1 and the exhaust pipe 12. The filter bags 15 are used to filter the dust in the raw material container 1 that enters the exhaust pipe 12. A cylinder for driving the filter bags 15 to reciprocate and compress is also installed on the exhaust pipe 12. The fixed end of the cylinder is installed on the exhaust pipe 12, and the output end of the cylinder is connected to the filter bag 15.

[0077] It should be noted that the filter bag 15 has a certain elasticity, and the cylinder drives the filter bag 15 to stretch within the elastic range. The cylinder drives the filter bag 15 to stretch back and forth to bounce the mixed powder collected in the filter bag 15 back into the raw material container 1.

[0078] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing an activated composite microbial fertilizer, characterized in that: The following steps are involved: Step 101, preparing Bacillus subtilis powder and nitrifying bacteria powder according to a designed ratio; Step 102, feeding the prepared Bacillus subtilis powder and nitrifying bacteria powder into a composite microbial fertilizer preparation device; Step 103, opening the air inlet system of the composite microbial fertilizer preparation device to introduce hot air into the composite microbial fertilizer preparation device, so that the mixed powder of the Bacillus subtilis powder and the nitrifying bacteria powder inside is in a boiling state; Step 104, starting the binder spraying unit of the composite microbial fertilizer preparation device to spray atomized binder droplets into the powder in a boiling state; Step 105, sucking the initially formed particles into the coating channel of the composite microbial fertilizer preparation device through the suction pump of the composite microbial fertilizer preparation device, during which the binder is sprayed again and nitrifying bacteria powder is added to ensure that the surface of each fertilizer preparation is evenly coated with a layer of nitrifying bacteria; In step 106, the fertilizer preparation after being processed in the wrapping channel will return to the composite microbial fertilizer preparation device and continue to be acted upon by hot air, so that the adhesive in the middle layer is dried and the nitrifying bacteria in the outer layer of the preparation are fixed, thereby forming a three-layer granular fertilizer preparation with an inner layer of Bacillus subtilis powder, a middle layer of adhesive, and an outer layer of nitrifying bacteria powder.

2. The method for preparing an activated composite microbial fertilizer according to claim 1, characterized in that: The composite microbial fertilizer preparation device includes a raw material container. In step 102, Bacillus subtilis powder and nitrifying bacteria powder are added into the raw material container from a raw material inlet of the raw material container; The air intake system includes a blower, an air heating box and an air intake pipe. In step 103, the blower blows air into the air heating box, where the air is heated by the internal heating wire, and then blown into the raw material container from the bottom of the raw material container through the air intake pipe, so that the hot air entering the raw material container passes through the isolation diverter plate to form a circulation inside the raw material container, thereby making the mixture of Bacillus subtilis powder and nitrifying bacteria powder inside present a boiling state; The adhesive spraying unit includes a peristaltic pump 1, an adhesive source and a spray gun 1. In step 104, the peristaltic pump 1 sucks out the adhesive source stored in the adhesive source and sprays it into the raw material container through the spray gun 1.

3. The method for preparing an activated composite microbial fertilizer according to claim 2, characterized in that: A first filter plate is installed inside the air heating box, so that the air blown in from the blower and heated by the air heating box is filtered and purified by the first filter plate before entering the raw material container to remove impurities and particulate matter in the air.

4. The method for preparing an activated composite microbial fertilizer according to claim 3, characterized in that: In step 104, a coating liquid is also added to the mixed powder in a boiling state; The composite microbial fertilizer preparation device comprises a coating liquid spray unit, which comprises a peristaltic pump 2, a coating liquid source and a spray gun 2; adding the coating liquid to the mixed powder in a boiling state comprises the following steps: Step 1: preparing an ethyl cellulose solution as a coating solution and placing it in a coating solution source; Step 2: extracting the coating liquid from the coating liquid source through the peristaltic pump 2 and delivering it to the spray gun 2; Step 3: Install a coating liquid spray unit on the top of the inner cavity of the raw material container, and use a spray gun to spray the atomized ethyl cellulose solution onto the granular fertilizer preparation in the raw material container so that the surface of the particles is evenly covered with a layer of coating liquid.

5. The method for preparing an activated composite microbial fertilizer according to claim 4, characterized in that: The wrapping channel includes a channel tube, a feed hopper, a discharge hopper and a suction pump. The suction force generated by the suction pump is used to suck the granular fertilizer preparation in the raw material container into the channel tube through the feed hopper, and then discharged into the raw material container again through the discharge hopper.

6. The method for preparing an activated composite microbial fertilizer according to claim 5, characterized in that: The wrapping channel is composed of channel 1, channel 2 and channel 3 which are continuous from top to bottom. The particles are sucked into the channel tube from the raw material container by the action of the suction pump, and then discharged back to the raw material container after being processed. In step 105, the steps of spraying the binder and adding nitrifying bacteria powder include: Step 1, adding adhesive: an adhesive pipeline is arranged on the pipe wall of channel 1, the pipeline is connected to an adhesive source, and the adhesive is introduced into channel 1 through a pumping system, so that the surface of the granular fertilizer preparation entering channel 1 is covered with a layer of adhesive; Step 2, adding nitrifying bacteria powder: a nitrifying bacteria powder pipeline is set on the wall of channel three, the pipeline is connected to the nitrifying bacteria powder source, and the nitrifying bacteria powder is introduced into channel three through a pumping system, so that the particles already covered with the adhesive are further coated with a layer of nitrifying bacteria powder.

7. The method for preparing an activated composite microbial fertilizer according to claim 6, characterized in that: A second filter plate is installed on the inner wall of the second channel. The filter plate is located before the suction pump and is used to prevent particles from the raw material container from entering the suction pump.

8. The method for preparing an activated composite microbial fertilizer according to claim 7, characterized in that: A baffle plate that moves up and down is installed inside the raw material container, and the feed hopper is closed by the baffle plate when the wrapping channel is not in use.

9. The method for preparing an activated composite microbial fertilizer according to claim 8, characterized in that: A driving member is installed on the top of the blocking plate, and the driving member is used to control the blocking plate to move up and down along the slide groove on the inner wall of the raw material container, thereby opening and closing the feed hopper. Expansion covers are installed on the outsides of the feed hopper and the discharge hopper.

10. The method for preparing an activated composite microbial fertilizer according to claim 9, characterized in that: The composite microbial fertilizer preparation device includes an exhaust dust removal system, which includes a plurality of filter bags installed between the top of the raw material container and the exhaust pipe. The filter bags are driven by the reciprocating motion of the cylinder to perform compression and release operations, so that the filter bags can periodically clean the dust attached to their surface, thereby shaking off the accumulated dust back into the raw material container.

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