A method for preparing a solid slow-release carbon source

Abstract

The present invention discloses a preparation method of a solid slow-release carbon source, belonging to the technical field of sewage treatment, and solving the problem that the whole solid carbon source is prone to dispersion when the dosage of the cross-linking agent is too small. The method includes the following steps: material preparation, preparing a material including polyethylene terephthalate, polylactic acid, polycaprolactone, carbon nanotubes, graphene, diatomite, bentonite, kaolin, dioctyl phthalate, graft copolymer, titanium dioxide, and fluoride complex; mixing the prepared materials by a solvent method using dichloromethane as a solvent and dispersing them by a high-speed shear emulsifier to obtain a mixed material. The present invention prepares a solid carbon source with a stable structure and slow-release carbon element, which has high strength and toughness. The compatibility of the materials is enhanced by the graft copolymer to ensure water resistance, and it is not prone to dispersion. During the preparation process, friction is used to create wounds, which accelerates the reaction with microorganisms, shortens the reaction time, and ensures the reaction rate through a re-inspection system, and is effectively applied to sewage treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly to a method for preparing a solid slow-release carbon source. Background Art

[0002] Compound carbon source is an efficient carbon source supplement in sewage treatment. It is composed of a variety of carbon source substances and can provide rich organic substances to promote the degradation and treatment of organic substances in sewage. This carbon source has multiple advantages: Firstly, it can be quickly absorbed and utilized by microorganisms, with a high reaction rate and adaptability; Secondly, the sludge production of the compound carbon source is lower than that of other carbon sources, and the sludge volume can be reduced by 15%-20%; Moreover, it has a higher COD content, saves freight, and is easier to operate at low temperatures, without the need for coagulation sedimentation, and the adaptability can reach -30 degrees; In addition, the carbon chain of the compound carbon source is shorter, making it easier to be decomposed and absorbed by microorganisms, and it is non-toxic and harmless. The liquid form of the compound carbon source is easy to control, saves labor costs, is convenient for storage and transportation, and does not belong to dangerous chemicals and hazardous wastes. Therefore, the compound carbon source plays an important role in improving sewage treatment efficiency, reducing costs, and reducing environmental pollution, and is applicable to various scenarios such as municipal and industrial sewage treatment plants.

[0003] In order to ensure that the compound carbon source can stably and continuously release carbon elements during the sewage treatment process, currently, the compound carbon source is prepared into a solid slow-release carbon source. For example, a solid slow-release carbon source and its preparation method with the publication number of CN115594305A, the technical key points of which include 30%-40% of corncobs, 20%-30% of peanut shells, 10%-20% of wheat straws, 20%-30% of rice husks, and 1%-3% of cross-linking agent. After the corncobs, peanut shells, wheat straws, and rice husks are crushed and preheated, they are frozen and formed under the action of the cross-linking agent. After the formed filler is cut, it is placed in a carrier composed of variable chains to obtain the required carbon source.

[0004] In the above solution, the carrier can increase or decrease the filler filling space by changing the shape of the deformable chain, and can orderly add the amount of solid slow-release carbon source according to the requirements of the carbon source for water quality. It can be recycled, is economical and efficient, and avoids the problem of difficult degradation of late cellulose caused by directly adding plant solid carbon source.

[0005] However, the solid slow-release carbon source in the above-mentioned formulation is mainly prepared by freezing and forming a large amount of biomass containing starch after pulverization through a cross-linking agent. Most of its components are mainly in the form of debris and particles. If the amount of the cross-linking agent is too much, it will be difficult for the components in the solid carbon source to react with the microorganisms in the sewage environment. If the amount of the cross-linking agent is too little, the entire solid carbon source is likely to disperse, making it impossible to achieve the slow-release effect, but being completely decomposed by microorganisms after a certain period of time. Therefore, it is necessary to improve the current solid slow-release carbon source to alleviate the problem that the entire solid carbon source is likely to disperse when the amount of the cross-linking agent is too little.

[0006] Therefore, a method for preparing a solid slow-release carbon source is proposed to solve or alleviate the above problems. Summary of the Invention

[0007] The purpose of the present invention is to solve the defects existing in the prior art, and a method for preparing a solid slow-release carbon source is proposed.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A method for preparing a solid slow-release carbon source includes the following steps:

[0010] Prepare materials, including polyethylene terephthalate, polylactic acid, polycaprolactone, carbon nanotubes, graphene, diatomaceous earth, bentonite, kaolin, dioctyl phthalate, graft copolymer, titanium dioxide, and fluoride complex;

[0011] Mix the prepared materials by the solvent method using dichloromethane as a solvent and disperse them through a high-speed shear emulsifier to obtain a mixed material;

[0012] Feed the dispersed mixed material into a screw extruder for extrusion molding to obtain a number of granular solid slow-release carbon sources;

[0013] The solid slow-release carbon source leaving the screw extruder drops into the opening assembly and forms wounds through friction before leaving.

[0014] Preferably, the preparation includes 20-30% of polyethylene terephthalate, 20-30% of polylactic acid, 10-15% of polycaprolactone, 5-10% of carbon nanotubes, 3-5% of graphene, 3-5% of diatomaceous earth, 2-3% of bentonite, 3-4% of kaolin, 2-3% of dioctyl phthalate, 3-5% of graft copolymer, 1-2% of titanium dioxide, and 0.5-1% of fluoride complex.

[0015] Preferably, the graft copolymer includes materials such as PET-grafted polyacrylate.

[0016] Preferably, the fluoride complex includes materials such as sodium fluoride or aluminum fluoride.

[0017] Preferably, when the dispersed mixture is put into a screw extruder for extrusion molding, the temperature inside the screw extruder is between 140°C and 180°C.

[0018] Preferably, the opening assembly includes a guiding pipe communicated with the outlet end of the screw extruder, a garlic bulb-shaped cover communicated with the guiding pipe and vertically arranged, a support frame fixedly connected to the bottom opening of the garlic bulb-shaped cover, a servo motor vertically and fixedly connected to the support frame, and a friction disc coaxially and fixedly connected to the output shaft of the servo motor and located above the support frame. A guiding inclined surface is arranged at the top edge of the friction disc. The friction disc is located inside the garlic bulb-shaped cover. The lower opening area of the garlic bulb-shaped cover is larger than the upper opening area of the garlic bulb-shaped cover. A resin layer is coated on the inner wall of the garlic bulb-shaped cover. The guiding pipe is L-shaped. One end of the guiding pipe is fixedly connected to the upper end of the garlic bulb-shaped cover. A connecting flange is fixedly connected to the outer circle of the other end of the guiding pipe. The guiding pipe is detachably connected to the outlet end of the screw extruder through the connecting flange.

[0019] Preferably, the following steps are further included.

[0020] Collect a tiled image of the solid slow-release carbon source leaving the opening assembly through an image acquisition module in the re-inspection system. The background of the tiled image is a solid color.

[0021] The image acquisition module in the re-inspection system transmits the tiled image to the data processing module in the re-inspection system. The data processing module in the re-inspection system judges the wound condition of the solid slow-release carbon source in the tiled image and outputs the result to the control module in the re-inspection system. The control module controls the rotation speed of the servo motor according to the output result.

[0022] Preferably, collecting a tiled image of the solid slow-release carbon source leaving the opening assembly through an image acquisition module in the re-inspection system includes the following steps.

[0023] Take the solid slow-release carbon source leaving the opening assembly in the same batch and tile it on a solid-color material tray.

[0024] Collect an image of the solid slow-release carbon source tiled in the solid-color material tray through the image acquisition module in the re-inspection system to obtain a tiled image.

[0025] The image acquisition module in the re-inspection system transmits the tiled image to the data processing module in the re-inspection system.

[0026] Preferably, the data processing module in the re-inspection system judging the wound condition of the solid slow-release carbon source in the tiled image and outputting the result to the control module in the re-inspection system includes the following steps.

[0027] Perform filtering processing and color space conversion preprocessing on the planar image.

[0028] Set a color threshold to distinguish the solid slow-release carbon source from the background;

[0029] Convert the processed planar image into a binary image, where the solid slow-release carbon source is the foreground and the background is the background;

[0030] Mark the solid slow-release carbon source in the binary image through connected component analysis;

[0031] Count the total number of solid slow-release carbon sources based on the number of connected components;

[0032] Use an edge detection algorithm on the processed planar image to detect scratches on the surface of the solid slow-release carbon source;

[0033] Extract texture features from the processed planar image through a local binary module;

[0034] Combine the results of edge detection and texture analysis to determine which solid slow-release carbon sources have worn scratches on their surfaces, and output the number of solid slow-release carbon sources with worn scratches;

[0035] Judge whether the number of solid slow-release carbon sources with worn scratches is greater than 85% of the total number of solid slow-release carbon sources. If it is greater, output the result as no need to control the servo motor speed. If it is less, output the result as controlling the servo motor speed to increase;

[0036] Preferably, the re-inspection system includes an image acquisition module, a data processing module, and a control module. The output end of the image acquisition module is communicatively connected to the input end of the data processing module. The output end of the data processing module is communicatively connected to the input end of the control module. The control module is coupled to the servo motor through a motor drive chip.

[0037] The present invention has the following beneficial effects:

[0038] The present invention can prepare a solid carbon source with a stable structure, slow-release carbon element and long maintenance time. And while the solid slow-release carbon source itself has good strength, it also takes into account good toughness. The compatibility between various materials in this solid slow-release carbon source is enhanced through graft copolymers, and it is not easy to disperse. At the same time, the water resistance of this solid slow-release carbon source is ensured through this formulation, and it is not easy to release prematurely when immersed in sewage. In addition, after preparing the solid slow-release carbon source, the present invention also makes incisions on it by friction, so that when the solid slow-release carbon source is put into sewage, it can contact and react with microorganisms at the position of the incision immediately, shortening the reaction time. At the same time, for the solid slow-release carbon source that has not been actually applied after friction treatment, it is detected again through the re-inspection system to ensure that most of the prepared solid slow-release carbon sources can form incisions to ensure their reaction rate at the first time, so that the solid slow-release carbon source can play an effective role in the sewage treatment link. Brief Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0040] Figure 1 is a flow block diagram of the present invention;

[0041] Figure 2 is a structural schematic diagram of the screw extruder and the opening assembly in the present invention;

[0042] Figure 3 is a partial cross-sectional view of the screw extruder and the opening assembly in the present invention;

[0043] Figure 4 is Figure 3 an enlarged view of part A in

[0044] Figure 5 is a structural block diagram of the re-inspection system in the present invention.

[0045] 1. Screw extruder; 2. Opening assembly; 3. Connecting flange; 4. Guide pipe; 5. Garlic head cover; 6. Support frame; 7. Servo motor; 8. Friction disc; 9. Image acquisition module; 10. Data processing module; 11. Control module. Detailed Description of the Embodiments

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0048] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0050] In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0052] A method for preparing a solid slow-release carbon source, as Figure 1 shown, includes the following steps,

[0053] Prepare materials, and prepare a composition including polyethylene terephthalate, polylactic acid, polycaprolactone, carbon nanotubes, graphene, diatomaceous earth, bentonite, kaolin, dioctyl phthalate, graft copolymer, titanium dioxide, and fluoride complex;

[0054] Mix the prepared materials by the solvent method using dichloromethane as a solvent and disperse them with a high-speed shear emulsifier to obtain a mixed material;

[0055] Feed the dispersed mixed material into a screw extruder 1 for extrusion molding. When feeding the dispersed mixed material into the screw extruder 1 for extrusion molding, the temperature inside the screw extruder 1 is between 140 - 180 °C to obtain a number of granular solid slow-release carbon sources;

[0056] The solid slow-release carbon source leaving the screw extruder 1 drops into the opening assembly 2, forms a wound by friction, and then leaves.

[0057] The present invention can provide a solid carbon source with a stable structure and capable of slowly releasing carbon elements for a long time. This solid carbon source not only has qualified strength but also good toughness. By using graft copolymers, the compatibility between materials is enhanced, making the solid carbon source not easily dispersed. In addition, the formulation ensures the water resistance of the carbon source, and it is not easily released prematurely even when soaked in sewage for a long time. In order to improve the reaction efficiency at the first moment when the carbon source is put into sewage, after the solid carbon source is prepared, friction treatment is particularly carried out to create wounds. In this way, once put into sewage, the carbon source can quickly contact and react with microorganisms through the wounds, greatly shortening the reaction time, and thus playing a more efficient role in the sewage treatment process.

[0058] Preferably, it is equipped with 20 - 30% polyethylene terephthalate, 20 - 30% polylactic acid, 10 - 15% polycaprolactone, 5 - 10% carbon nanotubes, 3 - 5% graphene, 3 - 5% diatomite, 2 - 3% bentonite, 3 - 4% kaolin, 2 - 3% dioctyl phthalate, 3 - 5% graft copolymer, 1 - 2% titanium dioxide, and 0.5 - 1% fluoride complex.

[0059] Preferably, the graft copolymer includes materials such as PET - graft - polyacrylate.

[0060] Preferably, the fluoride complex includes materials such as sodium fluoride or aluminum fluoride.

[0061] Among them, the combination of polyethylene terephthalate (PET), polylactic acid (PLA), and polycaprolactone (PCL) enables this solid slow - release carbon source to have excellent strength and toughness while providing a stable carbon source, ensuring that the material is not easily broken or damaged during use;

[0062] The high strength and water resistance of PET provide a solid carrier for the carbon source, enhancing the stability of the carbon source in different environments. PLA, through its biodegradable properties, ensures that the material can decompose within an appropriate time, slowly releasing the carbon source, and at the same time improving the environmental friendliness of the formulation. The low melting point and good flexibility of PCL help regulate the degradation rate of the overall material, making the release of the carbon source more persistent and controllable. In addition, the combination of PET and PLA interacts through the differences in their degradation rates and hydrolysis characteristics, playing a role in controlling the degradation rate and delaying the release of the carbon source. The slow degradation characteristics of PET can effectively delay the degradation process of PLA, while PLA provides the function of quickly releasing the carbon source;

[0063] The addition of carbon nanotubes and graphene not only improves the mechanical properties and conductivity of the solid slow-release carbon source, but also further promotes the uniform release of the carbon source through their extremely high surface area and reactivity. Carbon nanotubes increase the rate of carbon source release by enhancing the structural strength of the solid slow-release carbon source and providing more reaction sites; graphene enables the carbon source to be released uniformly and stably even under environmental changes through its ultra-high conductivity and stability;

[0064] While diatomite, bentonite, and kaolin enhance the stability and hydrolysis resistance of the solid slow-release carbon source and improve the slow-release characteristics of the carbon source. Diatomite improves the water absorption and hydrolysis resistance of the composite material through its porous structure, enabling continuous release of the carbon source in an aqueous environment; bentonite regulates the release rate of the carbon source using its layered structure to avoid its rapid decomposition, and kaolin further enhances the hydrolysis resistance and physical stability of the solid slow-release carbon source;

[0065] Dioctyl phthalate and graft copolymers play important roles in improving the flexibility and processability of the material. Dioctyl phthalate can increase the flexibility of the solid slow-release carbon source, enhance its water resistance, and extend the release period of the carbon source; while graft copolymers help improve the compatibility between different components to ensure that the carbon source is slowly released as expected during use;

[0066] Finally, titanium dioxide and fluoride composites can effectively regulate the reaction rate of the carbon source, avoiding its too fast or too slow release, thereby further controlling the release curve of the carbon source.

[0067] Preferably, as Figures 2 to 4 shown, the opening assembly 2 includes a guiding tube 4 communicated with the outlet end of the screw extruder 1, a garlic-shaped cover 5 communicated with the guiding tube 4 and vertically arranged, a support frame 6 fixedly connected to the bottom opening of the garlic-shaped cover 5, a servo motor 7 vertically fixedly connected to the support frame 6, and a friction disc 8 coaxially fixedly connected to the output shaft of the servo motor 7 and located above the support frame 6. The friction disc 8 is made of tungsten carbide. A guiding inclined surface is provided at the top edge of the friction disc 8. The friction disc 8 is located inside the garlic-shaped cover 5. The lower opening area of the garlic-shaped cover 5 is larger than the upper opening area of the garlic-shaped cover 5. A resin layer is coated on the inner wall of the garlic-shaped cover 5. The guiding tube 4 is L-shaped. One end of the guiding tube 4 is fixedly connected to the upper end of the garlic-shaped cover 5. A connecting flange 3 is fixedly connected to the outer circle of the other end of the guiding tube 4. The guiding tube 4 is detachably connected to the outlet end of the screw extruder 1 through the connecting flange 3.

[0068] When the opening assembly 2 forms wounds by friction on the solid slow-release carbon source leaving the screw extruder 1, the solid slow-release carbon source will enter the garlic-shaped hood 5 through the guiding tube 4. Since the shape of the guiding tube 4 is set to be L-shaped, when the solid slow-release carbon source enters the garlic-shaped hood 5 from the guiding tube 4, it drops vertically, which enables the solid slow-release carbon source to impact on the fast-rotating friction disc 8. The friction disc 8 can bring a large frictional force to the solid slow-release carbon source in the horizontal direction. When the solid slow-release carbon source maintains inertial displacement, the top surface of the friction disc 8 can rub against the solid slow-release carbon source, and then scratches due to wear appear on the surface of the solid slow-release carbon source as wounds. After that, the solid slow-release carbon source will be subjected to the frictional force of the friction disc 8 and the reaction force generated by its impact, so it will sputter outwards. The solid slow-release carbon source sputters onto the inner wall of the garlic-shaped hood 5 and contacts the resin layer, and then the resin layer absorbs a part of its mechanical potential energy, enabling the solid slow-release carbon source to fall off from the lower opening of the garlic-shaped hood 5 and be recycled by people;

[0069] After the solid slow-release carbon source is worn to form wounds in this way, its internal materials can be exposed. When it is put into sewage, the solid slow-release carbon source can react immediately, thus improving its reaction efficiency.

[0070] Preferably, the following steps are further included.

[0071] Collect a tiled image of the solid slow-release carbon source leaving the opening assembly 2 through the image acquisition module 9 in the re-inspection system, and the background of the tiled image is a solid color;

[0072] The image acquisition module 9 in the re-inspection system transmits the tiled image to the data processing module 10 in the re-inspection system. The data processing module 10 in the re-inspection system judges the wound condition of the solid slow-release carbon source in the tiled image and outputs the result to the control module 11 in the re-inspection system. The control module 11 controls the rotation speed of the servo motor 7 according to the output result.

[0073] Preferably, collecting a tiled image of the solid slow-release carbon source leaving the opening assembly 2 through the image acquisition module 9 in the re-inspection system includes the following steps.

[0074] Take the solid slow-release carbon source leaving the opening assembly 2 in the same batch and lay it flat on a solid-color tray;

[0075] Through the image acquisition module 9 in the re-inspection system, image acquisition is performed on the solid slow-release carbon source laid flat in the solid-color tray to obtain a tiled image;

[0076] The image acquisition module 9 in the re-inspection system transmits the tiled image to the data processing module 10 in the re-inspection system.

[0077] Preferably, the data processing module 10 in the re-inspection system determines the wound condition of the solid slow-release carbon source based on the tiled image and outputs the result to the control module 11 in the re-inspection system, including the following steps:

[0078] Perform filtering processing on the planar image

[0079]

[0080] And color space conversion preprocessing, convert RGB to HSV, where is the original pixel value of the planar image, is the pixel value after filtering;

[0081] Set color thresholds to distinguish the solid slow-release carbon source from the background

[0082] , where is the indicator function;

[0083] Convert the processed planar image into a binary image, where the solid slow-release carbon source is the foreground and the background is the background,

[0084] , where is the pixel value of the processed planar image, is the pixel value of the binary image;

[0085] Mark the solid slow-release carbon source in the binary image through connected component analysis , where is all the connected components in the binary image, is the i-th connected component;

[0086] Count the total number of solid slow-release carbon sources according to the number of connected components

[0087] ;

[0088] Use the Canny edge detection algorithm to detect scratches on the surface of the solid slow-release carbon source for the processed planar image. The Canny edge detection calculates the gradient of the image

[0089] , and use the double-threshold method for edge detection, , where and are the high and low thresholds;

[0090] Extract texture features from the processed planar image through the local binary module , where is the pixel value of the processed planar image, is the sign function, n is the number of neighborhood pixels, is the position of the neighborhood pixels;

[0091] Combining the edge detection and texture analysis results, determine which solid slow-release carbon sources have worn scratches on their surfaces , where, is the solid slow-release carbon source is the edge strength, is the texture feature, is the threshold for the existence of worn scratches, and output the number of solid slow-release carbon sources with worn scratches , where, is the indicator function;

[0092] Judge whether the number of solid slow-release carbon sources with worn scratches is greater than 85% of the total number of solid slow-release carbon sources. If it is greater, the output result is that there is no need to control the rotation speed of the servo motor 7. If it is less, the output result is to control the rotation speed of the servo motor 7 to increase.

[0093] Preferably, as Figure 5 shown, the re-inspection system includes an image acquisition module 9, a data processing module 10, and a control module 11. The output end of the image acquisition module 9 is communicatively connected to the input end of the data processing module 10. The output end of the data processing module 10 is communicatively connected to the input end of the control module 11. The control module 11 is coupled to the servo motor 7 through a motor drive chip. The image acquisition module 9 includes a camera, the data processing module 10 includes a processor, and the control module 11 includes a controller.

[0094] The above-mentioned re-inspection system is set up so that when people need to collect and produce the solid slow-release carbon source leaving the opening component 2, a quality inspection can be carried out in advance to ensure that there are clear wounds on the surface of the solid slow-release carbon source, avoiding the situation where the solid slow-release carbon source needs to be reworked a second time. Moreover, the re-inspection system has a high accuracy in detecting the solid slow-release carbon source of the same batch. The re-inspection system can completely count the total number of solid slow-release carbon sources through the color difference between the background and the solid slow-release carbon source in the planar image, and can also ensure a high accuracy in the number of solid slow-release carbon sources with wear and scratches extracted by the re-inspection system through the extraction of multiple features. In this case, by judging whether the number of solid slow-release carbon sources with wear and scratches is greater than 85% of the total number of solid slow-release carbon sources, the result can be relatively accurate. And if it is not greater than 85%, it means that when the solid slow-release carbon source falls on the friction disc 8, the friction disc 8 does not bring a large frictional force when contacting the solid slow-release carbon source, that is, the friction disc 8 does not form wounds on the surface wear of the solid slow-release carbon source. Therefore, it is necessary to adjust the rotation speed of the servo motor 7 by the control module 11 of the controller, increase its rotation speed, and then make the solid slow-release carbon source generate relative friction when hitting the top surface of the friction disc 8.

[0095] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for preparing a solid slow-release carbon source, characterized in that: The steps include: Prepare materials, including polyethylene terephthalate, polylactic acid, polycaprolactone, carbon nanotubes, graphene, diatomaceous earth, bentonite, kaolin, dioctyl ester, graft copolymer, titanium dioxide, and fluoride complex; mix the prepared materials by a solvent method using dichloromethane as a solvent and disperse them through a high-speed shear emulsifier to obtain a mixture; put the dispersed mixture into a screw extruder for extrusion molding to obtain a plurality of granular solid slow-release carbon sources; the solid slow-release carbon source leaving the screw extruder falls into an opening component and rubs to form a wound before leaving; The opening assembly includes a guide tube connected to the outlet end of the screw extruder, a garlic cover connected to the guide tube and arranged vertically, a support frame fixedly connected to the bottom opening of the garlic cover, a servo motor vertically fixedly connected to the support frame, and a friction disk coaxially fixedly connected to the output shaft of the servo motor and located above the support frame, the top edge of the friction disk is provided with a guide inclined surface, the friction disk is located in the garlic cover, the lower end opening area of ​​the garlic cover is larger than the upper end opening area of ​​the garlic cover, and the inner wall of the garlic cover is coated with a resin layer; The solid slow-release carbon source leaving the opening component is collected by the image acquisition module in the re-inspection system with a tiled image, and the background of the tiled image is a pure color; the solid slow-release carbon source leaving the opening component of the same batch is tiled on a pure color material tray; the solid slow-release carbon source tiled in the pure color material tray is collected by the image acquisition module to obtain a tiled image; the image acquisition module transmits the tiled image to the data processing module in the re-inspection system; The data processing module determines the wound condition of the solid slow-release carbon source according to the tiled image and outputs the result to the control module in the re-inspection system, including: The planar image is filtered and preprocessed by color space conversion; a color threshold is set to distinguish the solid slow-release carbon source from the background; the processed planar image is converted into a binary image, in which the solid slow-release carbon source is the foreground; the solid slow-release carbon source in the binary image is marked by connected region analysis; the total number of solid slow-release carbon sources is counted according to the number of connected regions; the scratches on the surface of the solid slow-release carbon source are detected by an edge detection algorithm for the processed planar image; texture features are extracted from the processed planar image by a local binary module; based on the edge detection and texture analysis results, it is determined which solid slow-release carbon sources have scratches due to wear on their surfaces, and the number of solid slow-release carbon sources with scratches due to wear is output; it is determined whether the number of solid slow-release carbon sources with scratches due to wear is greater than 85% of the total number of solid slow-release carbon sources. If so, the output result is that there is no need to control the speed of the servo motor. If so, the output result is to control the speed of the servo motor to increase. The control module controls the speed of the servo motor according to the output result.

2. The method for preparing a solid slow-release carbon source according to claim 1, characterized in that: The preparation includes 20-30% polyethylene terephthalate, 20-30% polylactic acid, 10-15% polycaprolactone, 5-10% carbon nanotubes, 3-5% graphene, 3-5% diatomaceous earth, 2-3% bentonite, 3-4% kaolin, 2-3% dioctyl ester, 3-5% graft copolymer, 1-2% titanium dioxide, and 0.5-1% fluoride complex.

3. The method for preparing a solid slow-release carbon source according to claim 1, characterized in that: The graft copolymer includes PET grafted polyacrylate material.

4. The method for preparing a solid slow-release carbon source according to claim 1, characterized in that: The fluoride compound includes sodium fluoride or aluminum fluoride material.

5. The method for preparing a solid slow-release carbon source according to claim 1, characterized in that: When the dispersed mixed material is fed into a screw extruder for extrusion molding, the temperature in the screw extruder is between 140-180°C.

6. The method for preparing a solid slow-release carbon source according to claim 1, characterized in that: The guide tube is L-shaped, one end of the guide tube is fixedly connected to the upper end of the garlic cover, and the outer ring of the other end of the guide tube is fixedly connected to a connecting flange. The guide tube is detachably connected to the outlet end of the screw extruder through the connecting flange.

7. The method for preparing a solid slow-release carbon source according to claim 1, characterized in that: The re-inspection system includes an image acquisition module, a data processing module, and a control module. The output end of the image acquisition module is communicatively connected to the input end of the data processing module, the output end of the data processing module is communicatively connected to the input end of the control module, and the control module is coupled to the servo motor through a motor driver chip.

Images