Feed premixing equipment and mixing method

Abstract

The invention relates to the technical field of feed processing equipment, and provides feed premixing equipment and a mixing method.The equipment comprises a mixing tank, a mechanical stirring assembly arranged in the mixing tank, an airflow pulse assembly arranged on the wall of the mixing tank and an ultrasonic vibration assembly coupled to the mixing tank; the equipment further comprises a mixing strategy optimization system and a set of data acquisition system; the data acquisition system is used for acquiring the torque, image, temperature, humidity and uniformity information of the material in real time and sending the information to the mixing strategy optimization system; the mixing strategy optimization system analyzes the material state in real time according to the collected data, and dynamically matches and optimizes the combined mode and process parameters of mechanical stirring, airflow pulse and ultrasonic vibration. According to the technical scheme, the technical problems that in the prior art, due to the fact that a single mechanical stirring and open-loop control mode is adopted, the mixing uniformity is low, heat-sensitive active ingredients are prone to damage, and the product quality consistency is poor are solved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of feed processing equipment, and in particular, to a feed premixing device and a mixing method. Background Art

[0002] The feed industry is a vital component of modern agriculture. Premix feed, a complex additive containing multiple active ingredients such as vitamins, trace elements, amino acids, and pharmaceutical additives, requires a high degree of mixing uniformity, which is directly related to the quality of the final feed product and the success of livestock and poultry farming. Uneven mixing can lead to growth retardation in some livestock and poultry due to insufficient intake of key nutrients, or to the risk of poisoning due to excessive intake of certain ingredients (especially pharmaceuticals). Therefore, achieving highly uniform mixing of premixes is one of the core technical challenges in the industry.

[0003] Currently, premixing equipment commonly used in the industry primarily relies on a single mechanical mixing method, such as horizontal ribbon mixers, vertical screw mixers, or zero-gravity twin-shaft paddle mixers. These devices achieve mixing by creating a macroscopic displacement of materials through the physical effects of the mixing mechanism, such as rotation, tumbling, and spreading. However, this single mixing method presents numerous limitations when handling the increasingly complex material systems found in modern feeds. First, for trace ingredients with strong electrostatic adsorption, poor flowability, or prone to agglomeration (such as choline chloride and vitamins), simple mechanical shear forces are unable to effectively break up and disperse these stubborn microaggregates, resulting in a large number of "pseudo-particles" in the mixture. This makes achieving mixing uniformity difficult, and prolonged mixing yields little benefit. Second, to achieve higher uniformity, operators often extend mixing times or increase stirring intensity, which not only significantly increases production energy consumption but, more importantly, excessive mechanical friction and shear heat can damage the bioactivity of certain heat-sensitive or easily oxidized active ingredients (such as vitamins and enzymes), ultimately outweighing the benefits. In addition, traditional mixing equipment usually uses fixed, experience-based process parameters for "open-loop" control, and is unable to make real-time adjustments based on fluctuations in the physical properties of different batches of raw materials (such as moisture, particle size, and static electricity). This results in poor product quality consistency and makes it difficult to meet the strict requirements of high-end, refined feed production. Summary of the Invention

[0004] To overcome the above-mentioned defects, the present invention provides a feed premixing device and a mixing method, which solve the technical problems in the prior art caused by the use of a single mechanical stirring and open-loop control method, such as low mixing uniformity, easy damage to heat-sensitive active ingredients, and poor product quality consistency.

[0005] According to one aspect, at least one embodiment of the present invention provides a feed premixing device, comprising: A mixing tank, wherein a mounting frame is fixed to the outside of the mixing tank, a feed hopper is fixedly connected to the top wall of the mixing tank, and a discharge pipe with a solenoid valve is fixedly connected to the bottom end of the mixing tank; A mechanical stirring assembly is rotatably mounted between the inner walls of the mixing tank, and a driving motor for driving the mechanical stirring assembly is mounted on the top wall of the mixing tank; An airflow pulse assembly, the airflow pulse assembly being fixed to the inner wall of the mixing tank and being used for injecting high-pressure pulse airflow into the mixing tank; an ultrasonic vibration component, the ultrasonic vibration component being coupled to the bottom of the mixing tank and being used to apply high-frequency vibration to the material in the mixing tank; and A mixing strategy optimization system is electrically connected to the drive motor, airflow pulse component and ultrasonic vibration component, and is used to collaboratively control the working parameters of the three components based on real-time monitored material properties.

[0006] For example, in a feed premixing device provided by at least one embodiment of the present invention, the mixing strategy optimization system includes: A material property analysis module, which is used to monitor the fluidity index and agglomeration coefficient of the material in the mixing tank in real time and output comprehensive material state parameters; A hybrid mode matching module, the hybrid mode matching module is used to determine the start and stop timing and basic intensity of the three modes of mechanical stirring, air flow pulse and ultrasonic vibration based on the comprehensive material state parameters; A process parameter optimization module is used to dynamically fine-tune the operating parameters of each mixing component based on the deviation between the set target uniformity and the uniformity monitored in real time.

[0007] For example, in a feed premixing device provided by at least one embodiment of the present invention, the premixing device also includes a data acquisition system, which is used to obtain the temperature, humidity, fluidity index and agglomeration coefficient of the material in real time and input them into the material property analysis module.

[0008] For example, in a feed premixing device provided by at least one embodiment of the present invention, the material property analysis module constructs a comprehensive material state model based on the acquired fluidity index, agglomeration coefficient, temperature and humidity to output the comprehensive material state parameters. The comprehensive material state model is expressed as:

[0009] in, S mat is the comprehensive material state parameter, I flow is the liquidity index,C agg is the aggregation coefficient, T is the temperature, H For humidity.

[0010] For example, in a feed premixing device provided by at least one embodiment of the present invention, the process parameter optimization module constructs a process parameter optimization model based on the deviation between the target uniformity and the real-time monitored uniformity to output the adjusted process parameters. The process parameter optimization model is expressed as:

[0011] in, P adj is the adjusted process parameter, P curr is the current process parameter, E is the deviation between the target uniformity and the real-time monitoring uniformity, K p 、 K i 、 K d is the control coefficient.

[0012] For example, in a feed premixing device provided by at least one embodiment of the present invention, the mechanical stirring assembly includes a drive shaft, which is rotatably installed in a vertical state at the center of the inner cavity of the mixing tank, a plurality of stirring shafts are fixed to the outer wall of the drive shaft, and two groups of spiral blades arranged in opposite directions are fixed to the outer end of the stirring shaft, and the power shaft of the drive motor passes through the top wall of the mixing tank through a bearing and is fixedly connected to the top end of the drive shaft.

[0013] For example, in a feed premixing device provided by at least one embodiment of the present invention, the airflow pulse component includes a main pipe, which is fixed on the outer wall of the mixing tank, and the main pipe is connected to an external high-pressure airflow device through an air inlet pipe. The side wall of the main pipe is fixedly connected with a plurality of annular pipes, and the annular pipes are fixed on the inner wall of the mixing tank. The outer wall of the annular pipe is equipped with a plurality of circumferentially distributed nozzles, and the nozzles can independently control the injection timing and pressure to form a controllable three-dimensional airflow field in the mixing tank.

[0014] For example, in a feed premixing device provided by at least one embodiment of the present invention, the ultrasonic vibration component includes a plurality of ultrasonic transducers distributed at the bottom of the mixing tank, and the ultrasonic transducers can work in groups or perform sweep frequency vibration.

[0015] For example, in a feed premixing device provided by at least one embodiment of the present invention, the data acquisition system includes a torque sensor, an optical imaging probe, a temperature and humidity sensor, and a near-infrared online uniformity analyzer.

[0016] According to another aspect, at least one embodiment of the present invention further provides a feed premixing method, the method comprising the following steps: Step 1: Layered feeding and initial state perception: Based on the density and particle size differences of the components in the mixed material, the carrier and various additives are added to the mixing tank in a preset layered order through the feed hopper to reduce the initial gravity stratification trend. At the same time, the mixing strategy optimization system obtains the initial state parameters of the materials in the silo through the data acquisition system, including flowability index, agglomeration coefficient, temperature and humidity. Step 2: Multi-modal collaborative mixing startup: The mixing strategy optimization system determines the initial mixing strategy based on the initial state parameters obtained in step 1, with the mixing mode matching module. First, the drive motor is started to drive the mechanical stirring component at a medium or low speed to stir and pre-mix the materials. Depending on the initial degree of agglomeration, the airflow pulse component is collaboratively started to impact and activate the materials in a high-frequency pulse mode, and the ultrasonic vibration component is started in a high-power mode to attack the stubborn agglomerates at the bottom of the bin. Step 3: Closed-loop dynamic optimization and homogenization: During the mixing process, the data acquisition system continuously feeds real-time material characteristics and the real-time uniformity value monitored by the near-infrared online uniformity analyzer into the mixing strategy optimization system. The process parameter optimization module uses a PID control algorithm to dynamically fine-tune the operating parameters of each component based on the deviation between the real-time uniformity and the preset target uniformity, thereby achieving refined homogenization. Step 4: Completion judgment and automatic unloading: The mixing strategy optimization system continuously judges whether the real-time uniformity reaches and stabilizes below the preset target threshold; once the completion conditions are met, the system immediately and automatically stops all mixing actions of the drive motor, air flow pulse component and ultrasonic vibration component to avoid excessive mixing and save energy; then, the system automatically opens the solenoid valve on the discharge pipe to discharge the evenly mixed finished material.

[0017] The beneficial effects of the embodiments of the present invention are: (1) In the present invention, a multimodal synergistic mixing field is constructed by organically combining three mixing mechanisms of different scales: mechanical stirring, airflow pulse impact, and ultrasonic vibration. Mechanical stirring is responsible for the overall tumbling and convection of the material, airflow pulse can strongly impact and loosen the material, and ultrasonic vibration can efficiently disperse and break up micro-aggregates that are difficult to handle with traditional methods. This three-dimensional mixing method can penetrate deep into the material, eliminating mixing dead corners, and significantly improving the mixing uniformity (CV value) of the final product, easily meeting the stringent standards of high-end premixes.

[0018] (2) The mixing strategy optimization system of the present invention achieves dynamic adjustment from "strong" to "gentle" through real-time monitoring of the material state and mixing process. In the initial stage of mixing, a high-intensity mode is used to quickly break up agglomerates; when the material uniformity reaches a certain level, the system automatically switches to a low-shear, low-energy gentle homogenization mode. This "force on demand" strategy significantly shortens the time the material is exposed to intense mechanical action and effectively controls the temperature rise during the mixing process, thereby maximizing the protection of the bioavailability of heat-sensitive and easily oxidized active ingredients such as vitamins and enzyme preparations, ensuring the final quality of the feed product.

[0019] (3) This invention changes the “open-loop” control mode of traditional equipment that relies on fixed parameters. By introducing a data acquisition system and three core algorithm modules, the equipment can sense key characteristics of the material such as fluidity and agglomeration in real time, and use the PID model to optimize the process parameters in real time and in a closed loop based on the deviation from the target uniformity. This enables the mixing process to automatically adapt to the differences in physical properties of different batches of raw materials and always operate under the optimal path. This not only significantly shortens the mixing time and reduces unit energy consumption, but also fundamentally guarantees the high consistency and stability of the quality of each batch of products, thereby improving the level of intelligent production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments of the present invention. Obviously, the drawings described below are merely exemplary embodiments of the present invention. Those skilled in the art can, without inventive effort, derive other drawings based on the contents of the exemplary embodiments of the present invention and these drawings.

[0021] Figure 1 It is a three-dimensional diagram of the external structure of the present invention; Figure 2 This is a three-dimensional diagram of the internal structure of the mixing tank of the present invention; Figure 3 This is a three-dimensional diagram of the mechanical stirring assembly structure of the present invention; Figure 4 This is a three-dimensional diagram of the airflow pulse component structure of the present invention; Figure 5 This is a structural block diagram of the hybrid strategy optimization system in the present invention; Figure 6 This is a structural block diagram of the data acquisition system in the present invention; Figure 7 Flow chart of the method of the present invention.

[0022] In the figure: 1. Mixing tank; 2. Mounting frame; 3. Feed hopper; 4. Discharge pipe; 5. Mechanical stirring assembly; 51. Drive shaft; 52. Stirring shaft; 53. Spiral blade; 6. Drive motor; 7. Air flow pulse assembly; 71. Main pipe; 72. Inlet pipe; 73. Ring pipe; 74. Nozzle; 8. Ultrasonic vibration assembly; 9. Mixing strategy optimization system; 901. Material property analysis module; 902. Mixing mode matching module; 903. Process parameter optimization module; 10. Data acquisition system; 101. Torque sensor; 102. Optical imaging probe; 103. Temperature and humidity sensor; 104. Near-infrared online uniformity analyzer (104). DETAILED DESCRIPTION The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0023] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0024] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0025] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0026] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0027] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0028] like Figures 1 to 4 The figure shows a feed premixing device according to one embodiment of the present invention. The main body of the device comprises a vertical cylindrical mixing tank 1 made of 304 stainless steel and securely mounted on the workshop floor via a mounting bracket 2 welded to its outer wall. A feed hopper 3 is welded to the center of the top of the mixing tank 1 for adding material to the tank. A discharge pipe 4 is fixedly connected to the lowest point of the bottom of the mixing tank 1. This discharge pipe 4 is equipped with a solenoid valve controlled by a subsequent control system for precise discharge control.

[0029] Inside the mixing tank 1, a mechanical stirring assembly 5 is provided. The core of this assembly is a drive shaft 51 installed in a vertical state at the center of the inner cavity of the mixing tank 1, and its upper and lower ends are rotatably installed at the center of the top and bottom walls of the mixing tank 1 through bearing seats. On the outer wall of the drive shaft 51, multiple layers of stirring shafts 52 are fixedly welded along its length, and each stirring shaft 52 extends horizontally. At the outer end of each stirring shaft 52, two groups of spiral blades 53 set in opposite directions are fixedly welded, one group pushes the material upward, and the other group pushes the material downward, forming a strong convection and shear mixing effect. On the outside of the top wall of the mixing tank 1, a drive motor 6 is installed, and its power shaft passes through the top wall of the mixing tank 1 through a sealed bearing, and is fixedly connected to the top of the drive shaft 51 through a coupling.

[0030] In order to solve the problem of micro-agglomeration, the equipment is equipped with an airflow pulse component 7 and an ultrasonic vibration component 8. The airflow pulse component 7 includes a main pipe 71 arranged vertically along the outer wall of the mixing tank 1, and the main pipe 71 is connected to an external high-pressure air source (such as an air compressor) through an air inlet pipe 72. Four ring pipes 73 are horizontally branched from the side wall of the main pipe 71. These four ring pipes 73 are fixed at different heights on the inner wall of the mixing tank 1. On the outer wall of each ring pipe 73, multiple nozzles 74 are evenly distributed circumferentially, and each nozzle 74 is connected to an independent solenoid valve, which can independently control the injection timing and pressure. The ultrasonic vibration component 8 consists of 6 high-power ultrasonic transducers, which are evenly distributed and coupled to the outside of the flat bottom of the mixing tank 1. They are driven by an ultrasonic generator and can realize group work or sweep frequency vibration in the range of 25-40kHz.

[0031] like Figure 6 As shown, it shows a data acquisition system (10) in a feed premixing device in one embodiment of the present invention. The system includes: A torque sensor 101 is installed at the connection between the drive shaft 51 and the drive motor 6 to measure the stirring torque. The signal is transmitted through a wireless transmission device to calculate the fluidity index of the material.

[0032] Two optical imaging probes 102, mounted in the middle and lower portions of the inner wall of the mixing tank 1, are used to capture images of the material and calculate the material's agglomeration coefficient using an image recognition algorithm. Optical imaging probes 102 are preferably industrial probes with a pulsed air purge function. Their optical windows are cleaned with high-pressure airflow before each imaging session to ensure consistently clear images of the material in a powder environment.

[0033] A temperature and humidity sensor 103 is installed on the upper inner wall of the mixing tank 1 to monitor the mixing environment.

[0034] A near-infrared online uniformity analyzer 104 is installed on the bypass of the discharge pipe 4 to monitor the uniformity CV value of the mixture in real time.

[0035] like Figure 5 Figure 1 shows a mixing strategy optimization system 9 for feed premixing equipment in one embodiment of the present invention. This system is implemented using an industrial control computer (IPC) and embedded software. The system communicates data and issues control commands with the inverter of the drive motor 6, the control valve assembly of the airflow pulse assembly 7, and the generator of the ultrasonic vibration assembly 8. The system consists of three functionally independent software modules: a material property analysis module 901, a mixing pattern matching module 902, and a process parameter optimization module 903.

[0036] The material property analysis module 901 is used to quantify the physical state of the material in the mixing tank in real time. It requests and receives raw sensor data from the data acquisition system 10 at a preset time period (for example, every 2 seconds). The module calculates the difference between the real-time torque value of the torque sensor 101 and the pre-stored no-load torque value of the equipment, and converts it into a standardized flowability index ( I flow At the same time, the module processes the material image captured by the optical imaging probe 102, uses edge detection and particle analysis algorithms to count the number and area of ​​particle agglomerates in the image whose size exceeds a preset threshold, and normalizes it to the agglomeration coefficient ( C agg Finally, the module will calculate the I flow 、 Cagg and the temperature obtained from the temperature and humidity sensor 103 ( T ) and humidity ( H ) parameters, which are passed as input variables to the comprehensive material status model.

[0037] In this embodiment, the comprehensive material state model ( ) is constructed as a weighting function:

[0038] w 1 、w 2 、w 3 、w 4 is the preset weight coefficient, and its value is determined according to the influence of each physical parameter on the mixing difficulty. f T （T） and f H （H） It is a nonlinear penalty function. When the temperature and humidity deviate from the optimal process window, its function value increases. The model outputs a single, quantitative comprehensive material state parameter through calculation. S mat The material properties analysis module 901 objectively converts the multi-dimensional, nonlinear physical properties of materials into a standardized comprehensive state parameter. S mat This parameter provides an accurate and reliable digital basis for subsequent mixing strategy decisions and realizes the quantitative characterization of the mixing process state.

[0039] The mixed mode matching module 902 can select the optimal mixed mode combination according to the current state of the material. Its core is a preset expert rule base that integrates the material state parameters. S mat The numerical range of is mapped to a predefined mixing strategy. For example: like: S mat >0.8, then match strategy A: "strong activation and deagglomeration mode".

[0040] If: 0.5< S mat <0.8, then match strategy B: “High-efficiency homogeneous mode”.

[0041] If: 0.2< S mat <0.5, then match strategy C: "mild homogenization and anti-stratification mode".

[0042] like: S mat≤ 0.2, then match strategy D: “fine adjustment and maintenance mode”.

[0043] Each strategy predefines the start and stop logic and basic operating parameter range of the three components: mechanical stirring, air flow pulse, and ultrasonic vibration. S mat After the value is determined, the rule base is queried to determine and output the mixing strategy and corresponding basic parameter set to be adopted in the current stage. The mixing pattern matching module 902 implements intelligent scheduling and combination of mixed physical fields. This ensures that the mixing force applied by the equipment matches the actual requirements of the material at each stage of the mixing process, thereby improving the targetedness and energy efficiency of the mixing process.

[0044] The process parameter optimization module 903 can perform closed-loop feedback control and fine-tuning on the selected mixing mode. It uses the basic parameters output by the mixing mode matching module 902 as a benchmark and performs dynamic fine-tuning by running the process parameter optimization model. ) is a standard digital proportional-integral-derivative (PID) controller. The module continuously obtains the real-time uniformity CV value from the near-infrared online uniformity analyzer (104) and compares it with the target CV value set by the user to calculate the deviation E .

[0045] Among them, the proportional term ( ) is used to provide a control action proportional to the current deviation to achieve a fast response. ) is used to accumulate historical deviations and eliminate possible static errors in the system to ensure that the target value can be accurately reached in the end. ) is used to perform predictive adjustments based on the rate of change of the deviation to suppress overshoot and increase system stability. The process parameter optimization module 903 performs algebraic summation on the calculation results of the three PID terms to obtain a net adjustment amount and applies it to the current process parameters ( P adj = P curr + adjustment amount). Ultimately, the module sends the calculated precise control instructions (for example, drive motor frequency, ultrasonic power percentage, etc.) to each hardware execution unit.

[0046] The process parameter optimization module 903 implements real-time closed-loop control of the mixing process. Through continuous feedback and adjustment, the system automatically compensates for disturbances caused by raw material batch differences or environmental changes, ensuring that the mixing process always proceeds along the optimal path. Ultimately, highly stable and consistent final product quality is achieved with the shortest time and lowest energy consumption.

[0047] like Figure 7 As shown, it shows a feed premixing method in one embodiment of the present invention, and the specific method steps are as follows: Step 1: Layered feeding and initial state perception The operator first adds 80kg of high-density stone powder carrier into the mixing tank 1 through the feed hopper 3, and then adds 15kg of trace element mixture (copper sulfate, ferrous sulfate, etc.) in sequence, and finally adds 5kg of vitamin premix. After completing the addition, the operator sets the target uniformity CV value to 2.5% on the touch screen of the mixing strategy optimization system 9, and then starts the "one-button intelligent mixing" program. The system immediately senses the initial state through the data acquisition system 10: the torque sensor 101 reads very high, the optical imaging probe 102 identifies a large number of dark agglomerates, and the temperature and humidity sensor 103 reads 25°C and 45%RH. Based on these data, the material property analysis module 901 uses the built-in model , the initial state is calculated to be “high agglomeration and low flow”.

[0048] Step 2: Multimodal collaborative hybrid launch The mixed mode matching module 902 matches and executes the "strong activation and deagglomeration" strategy according to the "high agglomeration, low flow" state. The system instructs the drive motor 6 to start at a medium speed of 45 rpm, driving the mechanical stirring component 5 to start macroscopic stirring. At the same time, the nozzle 74 on the middle two-layer ring tube 73 of the airflow pulse component 7 is instructed to perform high-frequency pulse spraying at a frequency of 5 Hz and a pressure of 0.5 MPa to strongly impact the material. At the same time, the ultrasonic vibration component 8 is instructed to operate at 90% of the rated power and a fixed frequency of 28 kHz to concentrate energy to break up the most stubborn agglomerates at the bottom of the tank.

[0049] Step 3: Closed-loop dynamic optimization and homogenization After about 60 seconds of mixing, the near-infrared online uniformity analyzer 104 reports that the CV value has dropped from the initial 50% to 10%. At the same time, the torque sensor reading drops, and the number of agglomerates identified by the optical probe decreases sharply. The process parameter optimization module 903 takes over and uses the PID model to calculate the deviation between the current CV value and the target value by 2.5%. Perform dynamic optimization: reduce the speed of the drive motor 6 to 30 rpm to reduce shear heat; switch the airflow pulse component 7 mode to a "precise shot" mode with four ring tubes rotating, low frequency (1 Hz), and high pressure (0.7 MPa) to eliminate possible mixing dead corners; switch the ultrasonic 8 mode to a sweep frequency vibration of 25-40 kHz for gentler and more comprehensive micro-homogenization.

[0050] Step 4: Complete judgment and automatic unloading The system continuously monitors the CV value. When the CV value reaches 2.4% (less than 2.5%) for the first time, the system enters a stable judgment period. Within the next 10 seconds, if three consecutive sampling values ​​are less than 2.5%, the system determines that mixing is complete. At this point, the power to the drive motor 6, airflow pulse component 7, and ultrasonic vibration component 8 is immediately cut off, and all mixing actions cease. The system then automatically opens the solenoid valve on the discharge pipe 4, and the evenly mixed finished material is discharged by gravity, completing the entire production process. The entire process takes approximately 180 seconds, and the product quality is stable and reliable.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A feed premixing device, characterized in that: include: A mixing tank (1), wherein a mounting frame (2) is fixedly provided on the outside of the mixing tank (1), a feed hopper (3) is fixedly connected to the top wall of the mixing tank (1), and a discharge pipe (4) with a solenoid valve is fixedly connected to the bottom end of the mixing tank (1); A mechanical stirring assembly (5), the mechanical stirring assembly (5) being rotatably mounted between the inner walls of the mixing tank (1), and a driving motor (6) for driving the mechanical stirring assembly (5) to work being mounted on the top wall of the mixing tank (1); An airflow pulse component (7), the airflow pulse component (7) being fixed on the inner wall of the mixing tank (1), and the airflow pulse component (7) being used to spray high-pressure pulse airflow into the mixing tank (1); an ultrasonic vibration component (8), the ultrasonic vibration component (8) being coupled to the bottom of the mixing tank (1), the ultrasonic vibration component (8) being used to apply high-frequency vibration to the material in the mixing tank (1); as well as A mixing strategy optimization system (9) is electrically connected to the driving motor (6), the airflow pulse component (7) and the ultrasonic vibration component (8), and is used to coordinately control the working parameters of the three components based on the material characteristics monitored in real time.

2. A feed premixing device according to claim 1, characterized in that, The hybrid strategy optimization system (9) includes: A material property analysis module (901), the material property analysis module (901) is used to monitor the fluidity index and agglomeration coefficient of the material in the mixing tank (1) in real time, and output comprehensive material state parameters; A mixed mode matching module (902), the mixed mode matching module (902) is used to determine the start and stop timing and basic intensity of the three modes of mechanical stirring, air flow pulse and ultrasonic vibration based on the comprehensive material state parameters; A process parameter optimization module (903) is used to dynamically fine-tune the operating parameters of each mixing component based on the deviation between the set target uniformity and the uniformity monitored in real time.

3. A feed premixing device according to claim 2, characterized in that, The pre-mixing device further comprises a data acquisition system (10), wherein the data acquisition system (10) is used to obtain the temperature, humidity, fluidity index and agglomeration coefficient of the material in real time, and input the data into the material property analysis module (901).

4. A feed premixing device according to claim 3, characterized in that: The material property analysis module (901) constructs a comprehensive material state model based on the obtained fluidity index, agglomeration coefficient, temperature and humidity to output the comprehensive material state parameters. The comprehensive material state model is expressed as: in, S mat is the comprehensive material state parameter, I flow is the liquidity index, C agg is the aggregation coefficient, T is the temperature, H For humidity.

5. A feed premixing device according to claim 4, characterized in that: The process parameter optimization module (903) constructs a process parameter optimization model based on the deviation between the target uniformity and the real-time monitoring uniformity to output the adjusted process parameters. The process parameter optimization model is expressed as: in, P adj is the adjusted process parameter, P curr is the current process parameter, E is the deviation between the target uniformity and the real-time monitoring uniformity, K p 、 K i 、 K d is the control coefficient.

6. A feed premixing device according to claim 1, characterized in that: The mechanical stirring assembly (5) includes a driving shaft (51), which is rotatably mounted in a vertical position at the center of the inner cavity of the mixing tank (1). A plurality of stirring shafts (52) are fixed to the outer wall of the driving shaft (51), and two groups of spiral blades (53) arranged in opposite directions are fixed to the outer ends of the stirring shafts (52). The power shaft of the driving motor (6) passes through the top wall of the mixing tank (1) through a bearing and is fixedly connected to the top end of the driving shaft (51).

7. A feed premixing device according to claim 1, characterized in that: The airflow pulse assembly (7) includes a main pipe (71), which is fixed on the outer wall of the mixing tank (1). The main pipe (71) is connected to an external high-pressure airflow device through an air inlet pipe (72). The side wall of the main pipe (71) is fixedly connected to a plurality of annular pipes (73), which are fixed on the inner wall of the mixing tank (1). The outer wall of the annular pipe (73) is equipped with a plurality of circumferentially distributed nozzles (74), and the nozzles (74) can independently control the injection timing and pressure to form a controllable three-dimensional airflow field in the mixing tank (1).

8. A feed premixing device according to claim 1, characterized in that: The ultrasonic vibration component (8) comprises a plurality of ultrasonic transducers distributed at the bottom of the mixing tank (1), and the ultrasonic transducers can work in groups or perform sweep frequency vibration.

9. A feed premixing device according to claim 3, characterized in that: The data acquisition system (10) includes a torque sensor (101), an optical imaging probe (102), a temperature and humidity sensor (103), and a near-infrared online uniformity analyzer (104).

10. A feed premixing method, characterized in that: The feed premixing device according to any one of claims 1 to 9 is used for mixing, and the method comprises the following steps: Step 1: Layered feeding and initial state perception: Based on the density and particle size differences of the components in the mixed material, the carrier and multiple additives are added to the mixing tank (1) in a preset order through the feed hopper (3) to reduce the initial gravity stratification trend; at the same time, the mixing strategy optimization system (9) obtains the initial state parameters of the material in the bin through the data acquisition system (10), including fluidity index, agglomeration coefficient, temperature and humidity; Step 2, multi-modal collaborative mixing start: the mixing strategy optimization system (9) determines the initial mixing strategy based on the initial state parameters obtained in step 1, and the mixing mode matching module (902); first, the driving motor (6) is started to drive the mechanical stirring component (5) at a medium or low speed to stir and pre-mix the material; and according to the initial agglomeration degree, the air flow pulse component (7) is collaboratively started to impact and activate the material in a high-frequency pulse mode, and the ultrasonic vibration component (8) is started in a high-power mode to mainly attack the stubborn agglomerates at the bottom of the bin; Step 3, closed-loop dynamic optimization and homogenization: During the mixing process, the data acquisition system (10) continuously feeds back the real-time material characteristics and the real-time uniformity value monitored by the near-infrared online uniformity analyzer (104) to the mixing strategy optimization system (9); the process parameter optimization module (903) uses the PID control algorithm to dynamically fine-tune the working parameters of each component according to the deviation between the real-time uniformity and the preset target uniformity, so as to perform refined homogenization; Step 4, completion judgment and automatic unloading: the mixing strategy optimization system (9) continuously judges whether the real-time uniformity reaches and stabilizes below the preset target threshold; once the completion condition is met, the system immediately and automatically stops all mixing actions of the drive motor (6), the air flow pulse component (7) and the ultrasonic vibration component (8) to avoid excessive mixing and save energy; then, the system automatically opens the solenoid valve on the discharge pipe (4) to discharge the evenly mixed finished material.

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