Mixing equipment for preparing feed based on solid trace elements

Abstract

The utility model relates to the technical field of feed mixing equipment, in particular to mixing equipment for preparing feed based on solid trace elements, which comprises a mixing cabin, a double-layer stirring assembly, an automatic feeding system, an airflow homogenizing device and a discharging mechanism. The double-layer stirring assembly improves the material uniformity through layered stirring; the automatic feeding system realizes accurate metering and partitioned feeding; the gas flow homogenizing device utilizes gas flow to assist in mixing, so that the dispersity is improved; the discharging mechanism achieves rapid and stable discharging through a spiral conveyor and an adjustable discharging opening. The inner wall of the mixing cabin body is coated with an anti-sticking coating, and the bottom of the mixing cabin body is conical, so that residues are reduced and cleanliness is improved. The solid trace elements and Chinese herbal medicine fermentation products can be efficiently and uniformly mixed, the activity of functional ingredients is guaranteed, the feed quality and production efficiency are remarkably improved, and the production requirements of high-quality laying hen feed are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of feed processing equipment, in particular to a mixing device for preparing feed based on solid trace elements. Background Art

[0002] In the field of laying hen feed processing, solid trace elements and Chinese herbal fermentation products are widely used. As key additives, they can significantly improve laying performance, eggshell quality, and immunity of laying hens. Solid trace elements occupy an important position in the modern feed industry due to their high stability and ease of storage and transportation. Chinese herbal fermentation products, on the other hand, have become an important raw material for improving feed quality due to their diverse functional ingredients and strong activity. However, how to achieve efficient, uniform, and lossless mixing of solid trace elements and Chinese herbal fermentation products during the mixing process, and adapt them to the integration requirements of fully automated production lines, remains an area where current technology urgently needs to be optimized.

[0003] A search revealed a "premix feed processing technology" with publication number CN105639696B, published on August 28, 2018. This technology utilizes a vertically arranged process equipment structure, with raw materials fed into a batching bin via a mobile, clean-up feeding vehicle. These materials are then transported to a batching scale via a tubular screw conveyor. Trace elements are manually fed directly into a mixer using an electronic micro-batch scale for mixing. While this solution improves weighing accuracy and reduces cross-contamination to a certain extent, it still has limitations. First, trace elements rely on manual batching, making batch-to-batch consistency difficult to ensure and potentially introducing human error, making it difficult to meet the requirements of fully automated continuous production. Second, the physical properties of solid trace elements (such as particle size and poor fluidity) are not specifically addressed, resulting in agglomeration or stratification during the mixing process, affecting the final mixing uniformity. Third, the system lacks compatibility with special functional ingredients, such as fermented Chinese herbal medicines, making it difficult to ensure the integrity and dispersion of active substances during the mixing process.

[0004] Another patent application, entitled "Feed-Grade Ferrous Sulfate Monohydrate Coating Method," with publication number CN101589764B, was published on September 28, 2011. This technology utilizes a double-layer coating of ferrous sulfate monohydrate to enhance its stability in composite premixes and reduce damage to sensitive ingredients such as vitamins A and C. While this method effectively improves the chemical stability of trace elements, its focus is on material modification rather than the mixing equipment itself, failing to address the practical challenges of dispersing solid trace elements within the mixing equipment. Specifically, this technology relies on an external coating process, which increases the complexity of the pretreatment process and hinders seamless integration with existing fully automated feed production lines. Second, it lacks a dedicated mixing device tailored to the properties of the coated particles. Conventional mixing equipment can still damage the coating, reducing sustained-release efficacy and bioavailability. Third, it lacks a design for synergistic mixing pathways for multiple functional additives (such as fermented herbal medicines), making it difficult to achieve synergistic effects among the components.

[0005] After searching, although CN217058247U discloses a double-layer stirring and airflow device, it is only suitable for drying scenarios. It does not solve the agglomeration problem of solid trace elements due to fine particles and poor fluidity, nor does it design a protection mechanism for the active ingredients of Chinese herbal medicines. The double-layer stirring structure disclosed by it cannot adapt to the uniformity requirements of functional feed (CV>10%).

[0006] The above-mentioned existing technologies demonstrate that current research on the application of trace elements in feed primarily focuses on raw material improvement or process optimization, while there remains a significant gap in specialized mixing equipment for preparing feed based on solid trace elements. In particular, in the fully automated production of laying hen feed, existing equipment generally suffers from low automation levels, insufficient mixing uniformity, poor compatibility with functional raw materials, and the potential loss of active ingredients. This makes it difficult to meet the efficient and stable production requirements of high-quality laying hen feed, particularly those requiring functional benefits such as improved eggshell gloss, enhanced immunity, and extended shelf life. Utility Model Content

[0007] The purpose of this utility model is to provide a mixing device for preparing feed based on solid trace elements. This device addresses the existing problems of extensive manual intervention, uneven mixing, poor compatibility, and low automation integration during the mixing process of solid trace elements and fermented herbal medicines. By designing a mixing device with a rational structure, stable operation, and suitability for fully automated production lines, this device achieves efficient, uniform, and lossless mixing of solid trace elements and fermented herbal medicine raw materials, while ensuring the activity and dispersion of the functional ingredients.

[0008] The utility model provides a mixing device for preparing feed based on solid trace elements, comprising:

[0009] hybrid cabin;

[0010] A double-layer stirring assembly is provided inside the mixing chamber and is used to stir the solid trace elements and the fermentation products of Chinese herbal medicine in layers;

[0011] An automatic feeding system is installed on the top of the mixing chamber and is connected to the mixing chamber through a conveying pipe, and is used to feed the pretreated solid trace elements and Chinese herbal medicine fermentation products into the mixing chamber respectively;

[0012] An air flow homogenizing device, which is arranged at the bottom of the mixing chamber and is used to assist in uniform distribution of the mixed materials through gas flow;

[0013] A discharging mechanism, located at the bottom of the mixing chamber and cooperating with the airflow homogenizing device, is used to discharge the mixed feed;

[0014] In which, the double-layer stirring assembly includes a main shaft and a first stirring blade group and a second stirring blade group arranged on the main shaft, the first stirring blade group is close to the upper part of the mixing chamber, the second stirring blade group is close to the lower part of the mixing chamber, and the first stirring blade group and the second stirring blade group are staggered along the axial direction of the main shaft; the outlet end of the automatic feeding system is connected to the upper and middle parts of the mixing chamber through multiple branch pipes respectively, and a flow control valve is provided in the branch pipe; the air flow homogenization device includes an annular air duct and multiple nozzles, the annular air duct is arranged around the bottom outer wall of the mixing chamber, and the nozzles are evenly distributed on the inner wall of the mixing chamber and connected to the annular air duct; the discharging mechanism includes a screw conveyor and a discharge port, the screw conveyor is arranged at the bottom center position of the mixing chamber, and the discharge port is located on one side of the screw conveyor and connected to an external storage bin.

[0015] Furthermore, the first stirring blade group is an inclined blade structure with an inclination angle of 30° to 45°, and the second stirring blade group is an upright blade structure with a blade width greater than the blade width of the first stirring blade group; the first stirring blade group and the second stirring blade group are fixedly connected by a spacer disk, and the diameter of the spacer disk is smaller than the inner diameter of the mixing chamber to form a material flow gap.

[0016] Furthermore, the automatic feeding system includes a storage bin, a metering device and a conveying pump. The storage bin is divided into a first storage bin and a second storage bin, which are respectively used to store solid trace elements and Chinese herbal fermentation products; the metering device is arranged at the outlet of the storage bin, for accurately controlling the feeding amount of each raw material; the conveying pump is connected to the outlet end of the storage bin through a flexible pipe, the end of the flexible pipe is connected to the inlet end of the branch pipe, and the outlet end of the branch pipe extends to the inner cavity of the mixing chamber.

[0017] Furthermore, the annular air duct is connected to an external air source through an air inlet pipe, and a pressure regulating valve and a flow meter are provided on the air inlet pipe for adjusting the pressure and flow of the gas entering the annular air duct; the number of the nozzles is 8 to 12, the outlet direction of each nozzle is toward the central axis of the mixing cabin, and the outlet end of the nozzle has a diffusion structure to increase the coverage of the gas.

[0018] Furthermore, the pitch of the screw conveyor gradually decreases from the center to the outside to achieve gradual compaction of the material during the conveying process; the opening area of ​​the discharge port can be adjusted by adjusting the baffle, and the baffle is connected to the outer wall of the mixing chamber through a slide rail, and a positioning pin is provided on the slide rail for fixing the position of the baffle.

[0019] Furthermore, the inner wall of the mixing chamber is coated with an anti-stick coating, which is made of polytetrafluoroethylene material to reduce the adhesion of materials to the inner wall of the mixing chamber; the top of the mixing chamber is provided with an observation window, which is made of transparent pressure-resistant glass to facilitate real-time monitoring of the mixing process.

[0020] Furthermore, the mixing equipment also includes a control system, which is electrically connected to the automatic feeding system, the double-layer stirring assembly, the airflow homogenization device and the discharging mechanism, and is used to coordinate the working status of each component; the control system has a built-in preset program, which can automatically adjust the operating parameters of each component according to different feed formulas.

[0021] Furthermore, the bottom of the mixing chamber is a conical structure with a conical angle of 60° to 75° to promote the gathering of materials toward the center; a plurality of guide plates are provided on the inner wall of the conical structure, and the guide plates are spirally arranged along the conical surface to guide the material to flow downward.

[0022] Compared to existing technologies, the mixing equipment provided by this utility model for preparing feed based on solid trace elements achieves efficient and uniform mixing of solid trace elements with fermented products of Chinese herbal medicines by utilizing a double-layer mixing assembly, an automatic feeding system, an airflow homogenization device, and a discharge mechanism. Specifically, the double-layer mixing assembly solves the problem of traditional single-layer mixing, which struggles to achieve uniformity between the upper and lower layers, through tiered mixing. The automatic feeding system eliminates errors caused by manual intervention through precise metering and zoned feeding. The airflow homogenization device significantly improves the dispersion and uniformity of the materials through gas flow-assisted mixing. The discharge mechanism, with its screw conveyor and adjustable discharge port, ensures rapid and stable discharge of the mixed feed. Furthermore, the mixing chamber's anti-stick coating and conical bottom design effectively reduce material residue, improving the equipment's cleanliness and efficiency. The zoned feeding of the automatic feeding system prevents degradation of active ingredients, while the double-layer mixing assembly and airflow homogenization device work together to address agglomeration issues. The spiral compaction design of the discharge mechanism ensures final product uniformity (CV ≤ 5%).

[0023] The above technical solution not only solves the problems of frequent manual intervention, uneven mixing, poor compatibility and low automation integration in the existing technology, but also significantly improves the quality and production efficiency of feed products by optimizing structural design and process flow, meeting the company's requirements for efficient and stable production of high-quality laying hen feed, especially functional needs such as improving eggshell gloss, enhancing immunity, and extending shelf life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention, showing the external outline of the mixing device and the layout relationship of its main components.

[0025] Figure 2 This is a cross-sectional view of the internal structure of the present invention, focusing on the arrangement of the double-layer stirring assembly, the airflow homogenizing device and the discharge mechanism in the mixing chamber.

[0026] Figure 3 This is a structural diagram of the automatic feeding system, showing in detail the connection between the storage bin, metering device, and branch pipes and the mixing chamber.

[0027] Figure 4 This is a partial enlarged view of the airflow homogenization device, which clearly marks the annular air duct, nozzle and its installation position relationship with the bottom of the mixing chamber.

[0028] Figure 5 A schematic diagram of the conical structure at the bottom of the mixing chamber shows the spiral arrangement of the guide plates and their guiding effect on material flow.

[0029] The accompanying drawings are numbered as follows:

[0030] 1. Mixing chamber; 2. Double-layer mixing assembly; 3. Automatic feeding system; 4. Air flow homogenization device; 5. Discharging mechanism; 6. First stirring blade group; 7. Second stirring blade group; 8. Storage bin; 9. Metering device; 10. Conveying pump; 11. Annular air duct; 12. Nozzle; 13. Screw conveyor; 14. Discharge port; 15. Guide plate; 16. Observation window; 17. Control system. DETAILED DESCRIPTION

[0031] The utility model provides a mixing device for preparing feed based on solid trace elements, the overall structure of which is as follows Figure 1 As shown, it includes a mixing chamber 1, a double-layer stirring assembly 2, an automatic feeding system 3, an air flow homogenizing device 4 and a discharging mechanism 5. These components achieve efficient mixing of solid trace elements and Chinese herbal medicine fermentation products through reasonable layout and connection.

[0032] The mixing chamber 1 is the core part of the equipment. Its internal space is used to accommodate the materials to be mixed. The external contour is designed as a vertical cylindrical structure. There is an observation window 16 on the top and a conical structure at the bottom. The cone angle is 60° to 75°. Figure 5 As shown in the figure, multiple guide plates 15 are arranged on the inner wall of the conical structure. These guide plates 15 are arranged in a spiral pattern along the conical surface, guiding the material flow toward the center and ultimately converging it to the location of the screw conveyor 13. The inner wall of the mixing chamber 1 is coated with a polytetrafluoroethylene anti-stick coating to reduce material adhesion during the mixing process. The top of the mixing chamber 1 is connected to the automatic feeding system 3, and the bottom is equipped with an airflow homogenizer 4 and a discharge mechanism 5.

[0033] The double-layer stirring assembly 2 is installed inside the mixing chamber 1, and its main shaft passes through the upper and lower ends of the mixing chamber 1 and is fixed by bearing supports. The first stirring blade group 6 and the second stirring blade group 7 are arranged on the main shaft, and the two groups of stirring blades are staggered along the axial direction of the main shaft. The first stirring blade group 6 is located in the upper part of the mixing chamber 1, and adopts an inclined blade structure with an inclination angle of 30° to 45°, which is used to push the material upward along the inner wall of the chamber; the second stirring blade group 7 is located in the lower part of the mixing chamber 1, and adopts an upright blade structure. Its blade width is greater than the blade width of the first stirring blade group 6, which is used to enhance the shearing effect of the material in the lower part. The first stirring blade group 6 and the second stirring blade group 7 are connected by a spacer disk. The diameter of the spacer disk is smaller than the inner diameter of the mixing chamber 1, thereby forming a material flow gap to ensure that the material can be smoothly exchanged between different layers.

[0034] Automatic feeding system 3 Figure 3As shown, it includes a storage bin 8, a metering device 9 and a delivery pump 10. The storage bin 8 is divided into a first storage bin and a second storage bin, which are respectively used to store solid trace elements and Chinese herbal fermentation products. A metering device 9 is provided at the outlet of the storage bin 8 for accurately controlling the amount of each raw material added. The delivery pump 10 is connected to the outlet end of the storage bin 8 through a flexible pipe, and the end of the flexible pipe is connected to a branch pipe, and the branch pipe extends to the inner cavity of the mixing chamber 1. There are two branch pipes, which are respectively connected to the upper and middle parts of the mixing chamber 1. A flow control valve is provided in the branch pipe to adjust the speed and flow of the material entering the mixing chamber 1.

[0035] Air flow homogenization device 4 such as Figure 4 As shown, it includes an annular air duct 11 and a nozzle 12. The annular air duct 11 is arranged around the bottom outer wall of the mixing chamber 1 and is connected to the external air source through an air inlet pipe. A pressure regulating valve and a flow meter are provided on the air inlet pipe to adjust the pressure and flow of the gas. The annular air duct 11 is connected to a plurality of nozzles 12, and the nozzles 12 are evenly distributed on the inner wall of the mixing chamber 1, with a number of 8 to 12. The outlet direction of each nozzle 12 is toward the central axis of the mixing chamber 1, and the outlet end of the nozzle 12 has a diffusion structure to increase the gas coverage range. The airflow homogenization device 4 assists the dispersion and uniform distribution of materials through gas flow, and is particularly suitable for processing materials with finer particles or easy to agglomerate.

[0036] Discharging mechanism 5 Figure 2 As shown, it includes a screw conveyor 13 and a discharge port 14. The screw conveyor 13 is arranged at the bottom center of the mixing chamber 1, and its pitch gradually decreases from the center to the outside to achieve gradual compaction of the material during the conveying process. The discharge port 14 is located on one side of the screw conveyor 13 and is connected to the external storage bin. The opening area of ​​the discharge port 14 can be adjusted by adjusting the baffle. The baffle is connected to the outer wall of the mixing chamber 1 through a slide rail. A positioning pin is provided on the slide rail for fixing the position of the baffle. The discharging mechanism 5 stably discharges the mixed material through the screw conveyor 13, and at the same time, the design of the discharge port 14 realizes flexible control of the discharge speed.

[0037] The control system 17 is electrically connected to the automatic feeding system 3, the double-layer stirring assembly 2, the airflow homogenizing device 4 and the discharge mechanism 5, and is used to coordinate the working status of each component. The control system 17 has a built-in preset program, which can automatically adjust the operating parameters of each component according to different feed formulas. For example, after starting the equipment, the control system 17 first controls the metering device 9 to start according to the set feeding ratio, and respectively delivers the solid trace elements and Chinese herbal fermentation products into the designated area of ​​the mixing chamber 1 through the delivery pump 10. Subsequently, the double-layer stirring assembly 2 starts to operate, and the first stirring blade group 6 and the second stirring blade group 7 work together to stir the material in layers. During this process, the airflow homogenizing device 4 injects gas into the mixing chamber 1 through the nozzle 12 to further improve the uniformity of the material. When the mixing is completed, the control system 17 controls the discharge mechanism 5 to start, and the screw conveyor 13 pushes the material to the discharge port 14 and discharges it.

[0038] The specific operating principle of the entire mixing process is as follows: After starting the equipment, the solid trace elements and Chinese herbal fermentation products in the storage bin 8 are accurately weighed by the metering device 9, and are respectively delivered to the upper and middle areas of the mixing chamber 1 through the delivery pump 10 and the branch pipe. At this time, the double-layer stirring assembly 2 starts to operate, the first stirring blade group 6 pushes the upper material upward along the inner wall of the chamber, and the second stirring blade group 7 applies shear force to the lower material, so that the material forms a circulating flow in the mixing chamber 1. At the same time, the air flow homogenization device 4 injects gas into the mixing chamber 1 through the nozzle 12, and the gas flow drives the material to further disperse, solving the problem that traditional mechanical stirring is difficult to completely eliminate material agglomeration. When the mixing time reaches the preset value, the control system 17 stops stirring and starts the discharging mechanism 5, and the screw conveyor 13 pushes the mixed material to the discharge port 14, and finally discharges it to the external storage bin.

[0039] Through the above-mentioned structural design and operation process, the mixing equipment of the utility model can achieve efficient and uniform mixing of solid trace elements and Chinese herbal medicine fermentation products, while reducing manual intervention, improving automation integration, and meeting the needs of high-quality feed production.

[0040] In order to better enable relevant personnel in this technical field to fully understand and implement the present invention, the implementation principle of the present invention is supplemented below in combination with specific application scenarios.

[0041] First, the automatic feeding system 3 is started, and the solid trace elements and Chinese herbal fermentation products in the storage bin 8 are accurately weighed by the metering device 9. The metering device 9 opens the outlet valves of the first storage bin and the second storage bin according to the feed formula ratio preset by the control system 17, and delivers the materials to the delivery pump 10. The delivery pump 10 pushes the materials to the branch pipe through a flexible pipe. The flow control valve in the branch pipe adjusts the speed and flow of the materials entering the mixing chamber 1 to ensure that the solid trace elements and Chinese herbal fermentation products enter from the upper and middle areas of the mixing chamber 1 respectively. This process utilizes the connection design between the branch pipe and the inner cavity of the mixing chamber 1 to achieve zoned feeding, avoiding premature mixing or agglomeration of the raw materials before entering the mixing chamber 1.

[0042] Subsequently, the double-layer stirring assembly 2 starts to operate, and the main shaft drives the first stirring blade group 6 and the second stirring blade group 7 to work together. The inclined blade structure of the first stirring blade group 6 pushes the material upward along the inner wall of the mixing chamber 1 at an angle of 30° to 45°, forming an upward circulation flow of the material; while the upright blade structure of the second stirring blade group 7 applies shear force to the lower material, enhancing the dispersion effect of the material at the bottom. The material flow gap formed by the spacer disk between the first stirring blade group 6 and the second stirring blade group 7 enables the material to be smoothly exchanged between different layers, thereby achieving uniform distribution of the upper and lower layers of material. During this process, the anti-stick coating on the inner wall of the mixing chamber 1 effectively reduces material adhesion and ensures mixing efficiency.

[0043] Simultaneously, the airflow homogenizer 4 injects gas into the nozzle 12 through the annular air passage 11. The gas diffuses through the nozzle 12, evenly covering the interior of the mixing chamber 1. The gas flow further disperses the material, especially for solid trace elements with fine particles or those prone to agglomeration. The airflow significantly reduces agglomeration and improves mixing uniformity. The design of the nozzle 12, oriented toward the central axis of the mixing chamber 1, ensures that the gas is evenly applied to the material, while the diffusion structure expands the gas coverage area, further optimizing the dispersion effect.

[0044] When the mixing time reaches the preset value of the control system 17, the double-layer mixing assembly 2 stops and the discharge mechanism 5 starts. The screw conveyor 13 gradually pushes the mixed material from the bottom center of the mixing chamber 1 to the discharge port 14. The pitch of the screw conveyor 13 gradually decreases from the center outward, so that the material is gradually compacted during transportation and prevents blockage during discharge. The baffle of the discharge port 14 adjusts the opening area through the slide rail, and the positioning pin fixes the baffle position, thereby flexibly controlling the discharge speed and ensuring that the mixed feed can be discharged stably to the external storage bin.

[0045] The conical structure at the bottom of the mixing chamber 1 and the spiral guide plates 15 on its inner wall play a key role in the mixing process. The 60° to 75° taper encourages material to converge toward the center, while the spiral arrangement of the guide plates 15 along the conical surface guides the material downward, ultimately converging at the location of the screw conveyor 13. This structural design not only improves material flowability but also reduces the amount of residue at the bottom of the mixing chamber 1, enhancing the cleanliness and efficiency of the equipment.

[0046] Through the aforementioned steps and the coordinated operation of various components, the mixing equipment of this utility model achieves efficient and uniform mixing of solid trace elements and fermented products of Chinese herbal medicines. The equipment demonstrates excellent compatibility and stability on a fully automated production line, meeting the demands of high-quality laying hen feed production while significantly reducing manual intervention and material loss.

[0047] Any details not described in detail in the specification are prior art known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used. Electrical control components not mentioned in this technical solution are prior art and are not shown in the figures, so they will not be described here.

[0048] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance. At the same time, in the description of the present invention, unless otherwise expressly specified or limited, the terms "connected" and "connected" should be understood in a broad sense. For example, they can mean fixed connection, detachable connection, or integral connection; they can mean mechanical connection or electrical connection; they can mean direct connection or indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0049] The above content is only a preferred embodiment of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scope based on the ideas of the present technical content. As long as these changes do not deviate from the concept of the present invention, they all fall within the scope of protection of this patent.

Claims

1. A mixing device for preparing feed based on solid trace elements, characterized in that: include: Hybrid pod (1); A double-layer stirring assembly (2) is arranged inside the mixing chamber (1) and is used to stir the solid trace elements and the fermentation products of Chinese herbal medicine in layers; An automatic feeding system (3), which is installed on the top of the mixing chamber (1) and is connected to the mixing chamber (1) through a conveying pipe, and is used to respectively feed the pretreated solid trace elements and the Chinese herbal medicine fermentation product into the mixing chamber (1); An air flow homogenizing device (4), which is arranged at the bottom of the mixing chamber (1) and is used to assist in uniform distribution of the mixed material through gas flow; A discharge mechanism (5), located at the bottom of the mixing chamber (1) and cooperating with the airflow homogenizing device (4), is used to discharge the mixed feed; The double-layer stirring assembly (2) comprises a main shaft and a first stirring blade group (6) and a second stirring blade group (7) arranged on the main shaft, wherein the first stirring blade group (6) is close to the upper part of the mixing chamber (1), and the second stirring blade group (7) is close to the lower part of the mixing chamber (1), and the first stirring blade group (6) and the second stirring blade group (7) are staggered along the axial direction of the main shaft; the outlet end of the automatic feeding system (3) is connected to the upper part and the middle part of the mixing chamber (1) respectively through a plurality of branch pipes, and the branch pipes are provided with flow control devices. valve; the air flow homogenizing device (4) includes an annular air channel (11) and a plurality of nozzles (12), the annular air channel (11) is arranged around the bottom outer wall of the mixing chamber (1), and the nozzles (12) are evenly distributed on the inner wall of the mixing chamber (1) and communicate with the annular air channel (11); the discharging mechanism (5) includes a screw conveyor (13) and a discharge port (14), the screw conveyor (13) is arranged at the bottom center of the mixing chamber (1), and the discharge port (14) is located on one side of the screw conveyor (13) and is connected to an external storage bin.

2. The mixing device for preparing feed based on solid trace elements according to claim 1, characterized in that: The first stirring blade group (6) is an inclined blade structure with an inclination angle of 30° to 45°, and the second stirring blade group (7) is an upright blade structure with a blade width greater than the blade width of the first stirring blade group (6); the first stirring blade group (6) and the second stirring blade group (7) are fixedly connected by a spacer disk, the diameter of the spacer disk being smaller than the inner diameter of the mixing chamber (1) to form a material flow gap.

3. The mixing device for preparing feed based on solid trace elements according to claim 1, characterized in that: The automatic feeding system (3) comprises a storage bin (8), a metering device (9) and a delivery pump (10), wherein the storage bin (8) is divided into a first storage bin and a second storage bin, which are respectively used to store solid trace elements and Chinese herbal medicine fermentation products; the metering device (9) is arranged at the outlet of the storage bin (8) and is used to accurately control the feeding amount of each raw material; the delivery pump (10) is connected to the outlet end of the storage bin (8) through a flexible pipe, the end of the flexible pipe is connected to the inlet end of the branch pipe, and the outlet end of the branch pipe extends to the inner cavity of the mixing chamber (1).

4. The mixing device for preparing feed based on solid trace elements according to claim 1, characterized in that: The annular air channel (11) is connected to an external air source via an air inlet pipe, and a pressure regulating valve and a flow meter are provided on the air inlet pipe for regulating the pressure and flow of the gas entering the annular air channel (11); the number of the nozzles (12) is 8 to 12, the outlet direction of each nozzle (12) is toward the central axis of the mixing chamber (1), and the outlet end of the nozzle (12) has a diffusion structure.

5. The mixing device for preparing feed based on solid trace elements according to claim 1, characterized in that: The pitch of the screw conveyor (13) gradually decreases from the center outward; the opening area of ​​the discharge port (14) can be adjusted by adjusting the baffle, and the baffle is connected to the outer wall of the mixing chamber (1) through a slide rail, and a positioning pin is provided on the slide rail for fixing the position of the baffle.

6. The mixing device for preparing feed based on solid trace elements according to claim 1, characterized in that: The inner wall of the mixing chamber (1) is coated with an anti-stick coating, and the anti-stick coating is made of polytetrafluoroethylene material; the top of the mixing chamber (1) is provided with an observation window (16), and the observation window (16) is made of transparent pressure-resistant glass.

7. The mixing device for preparing feed based on solid trace elements according to claim 1, characterized in that: It also includes a control system (17), which is electrically connected to the automatic feeding system (3), the double-layer stirring assembly (2), the airflow homogenizing device (4) and the discharge mechanism (5) for coordinating the working status of each component.

8. The mixing device for preparing feed based on solid trace elements according to claim 1, characterized in that: The bottom of the mixing cabin (1) is a conical structure with a conical angle of 60° to 75°; a plurality of guide plates (15) are provided on the inner wall of the conical structure, and the guide plates (15) are arranged in a spiral along the conical surface.

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