Compound fertilizer mixing device

Abstract

This invention discloses a compound fertilizer mixing device, belonging to the field of fertilizer mixing technology. It includes a frame, a discharge hood mounted on the frame, and a mixing cylinder disposed inside the discharge hood. A stirring assembly is located inside the mixing cylinder. The discharge hood has an upward-facing opening. The mixing cylinder is cylindrical and horizontally positioned at the upper opening of the discharge hood. A rectangular discharge hole is formed on the lower wall of the mixing cylinder. A sealing frame, made of elastic material, is installed around the discharge hole on its outer side. A cap, which is an arc-shaped plate structure adapted to the diameter of the mixing cylinder, is hinged to one end of the discharge hole along its length. One end of the cap is hinged to the mixing cylinder. A tilting drive device is installed between the cap and the mixing cylinder. A boss is installed on the inner surface of the cap, forming a sealing surface corresponding to the sealing frame around the boss on the inner side of the cap. This invention can solve the problems of material retention and insufficient mixing in the discharge area.

Description

Technical Field

[0001] This invention belongs to the field of fertilizer mixing technology, specifically relating to a mixing device for compound fertilizers. Background Technology

[0002] In the production of compound fertilizers, raw materials containing different nutrients are typically added to a mixing device according to the formula requirements to ensure thorough mixing and obtain a relatively homogeneous material. Existing mixing devices generally include a mixing tank, a stirring mechanism, a drive mechanism, and feeding and discharging mechanisms. Horizontal mixing devices usually have a motor-driven stirring shaft inside the tank, with impellers, ribbons, or other stirring components mounted on it. The rotation of these components agitates the material and moves it axially along the tank, promoting the exchange of materials between different locations. After mixing, the material is discharged through the outlet at the bottom of the tank and enters subsequent conveying, processing, or packaging stages. To control the unloading process, some devices are equipped with gate valves or butterfly valves at the outlet, using the opening and closing of these valves to achieve sealing during mixing and discharge after mixing is complete.

[0003] However, in some existing mixing devices, the bottom of the mixing tank is connected to a gate or butterfly valve via a short downward-extending pipe. The valve's closing surface is lower than the bottom of the tank, creating a cavity between the bottom outlet and the valve's closing surface. During feeding and mixing, some raw materials enter this cavity, while the agitator's movement is mainly above the tank bottom, making it difficult to directly act on the material within the cavity. This results in insufficient exchange between the material in this area and the main mixing zone, potentially retaining localized component differences caused by the order of feeding. Even if the main material in the tank has reached the expected mixing state, insufficiently mixed material may still exist in the cavity. After opening the valve, this material may be discharged first or in a concentrated manner, causing component fluctuations at different discharge times. If material adheres to the corners of the cavity, residual material may enter the next batch, affecting batch-to-batch consistency. Therefore, it is necessary to improve the bottom outlet structure of the mixing device to reduce material retention and localized insufficient mixing in the discharge area. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a compound fertilizer mixing device that can solve the problems of material retention and insufficient local mixing in the discharge area.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses a compound fertilizer mixing device, comprising a frame, a discharge hood mounted on the frame, and a mixing cylinder disposed inside the discharge hood. A stirring assembly is disposed inside the mixing cylinder. The discharge hood has an upward-facing opening. The mixing cylinder is cylindrical and horizontally positioned at the upper opening of the discharge hood. A rectangular discharge hole is formed on the lower wall of the mixing cylinder. A sealing frame, made of elastic material, is installed around the discharge hole on its outer side. A cap, which is an arc-shaped plate structure adapted to the diameter of the mixing cylinder, is hinged to one end of the discharge hole. A flipping drive device is installed between the cap and the mixing cylinder. A boss is installed on the inner surface of the cap, forming a sealing surface corresponding to the sealing frame around the boss on the inner side of the cap. The size of the boss is adapted to the size of the discharge hole. When the cap closes the discharge hole, the boss can fit into the inner side of the discharge hole. A cleaning assembly for cleaning the sealing surface is installed on the cap.

[0006] Furthermore, the cleaning component includes a first scraper and a second scraper disposed on both sides of the boss. The first scraper and the second scraper are respectively connected to both ends of the first support plate through elastic connectors. The first support plate is installed on the back side of the cover along the width direction of the cover. The two ends of the first support plate are respectively connected to the two ends of the slip ring through a first pull rope and a second pull rope. The first pull rope and the second pull rope are elastic pull ropes. The slip ring is slidably installed on the outside of the mixing cylinder. A displacement device for driving the slip ring to move is installed on the mixing cylinder. The position of the slip ring on the mixing cylinder corresponds to the flip position of the cover.

[0007] Furthermore, a scraper is installed on the sealing surface, extending along the width direction of the cover. The scraper is located on the surface of the sealing surface away from the rotating shaft. The two ends of the scraper are respectively connected to the two ends of the second support plate through elastic connectors. The second support plate is installed on the back side of the cover along the width direction of the cover. A first magnetic block is installed on the side of the scraper facing the boss. A second magnetic block corresponding to the first magnetic block is installed on the boss. A third magnetic block corresponding to the first magnetic block is installed on the first scraper and the second scraper.

[0008] Furthermore, the elastic connector includes an L-shaped guide rod, one end of which is connected to the scraper, and the other end of which slides through a guide hole on the second support plate and is connected to a limiting member. The end of the guide rod connected to the second support plate is perpendicular to the second support plate, and an elastic support device is installed between the limiting member and the second support plate.

[0009] Furthermore, a rotating ring is rotatably installed on the mixing cylinder. The rotating ring corresponds to the surface of the sealing surface near the end of the rotating shaft. The rotating ring is connected to a reciprocating rotation drive device. A groove is opened on the inner side of the lower end of the rotating ring. Brushes are installed on both the inner and outer surfaces of the groove. The brush on the outer surface is used to clean impurities on the surface of the sealing surface.

[0010] Furthermore, a screw conveyor mechanism is installed on the material discharge hood, which is used to output the material inside the material discharge hood to the outside.

[0011] Furthermore, the mixing device includes a motor, a first transmission wheel, a transmission belt, a second transmission wheel, a central shaft, a first support rod, a first stirring ring, a second support rod, and a second stirring ring. The motor is installed on the outside of the material discharge hood, and the output end of the motor is connected to the first transmission wheel. The first transmission wheel is connected to the second transmission wheel via a transmission belt, and the second transmission wheel is coaxially connected to the central shaft. The central shaft is coaxially installed at the center of the mixing cylinder. The first support rod and the second support rod are installed on the outside of the central shaft. The outer ends of the first support rod and the second support rod are respectively connected to the first stirring ring and the second stirring ring. Both the first stirring ring and the second stirring ring are spiral ring structures. The outer diameter of the spiral of the first stirring ring is smaller than the inner diameter of the spiral of the second stirring ring, and the outer diameter of the spiral of the second stirring ring is adapted to the inner diameter of the mixing cylinder.

[0012] Furthermore, rotating seats are fixedly installed at both ends of the discharge hood, and the two ends of the mixing cylinder are respectively rotatably engaged with the two rotating seats. The rotating seats and the mixing cylinder can be fixed by locking parts. By rotating the mixing cylinder around the axis of the mixing cylinder, the circumferential position of the discharge hole and the cover on the mixing cylinder can be changed.

[0013] The beneficial effects of this invention are as follows: This invention discloses a compound fertilizer mixing device. A material discharge hole is provided on the lower side of a horizontally placed mixing cylinder, and sealed with an arc-shaped cap featuring a protrusion. When the cap is closed, the protrusion embeds into the discharge hole, occupying the recessed space in the discharge section that could otherwise hold material. Compared to discharge structures where a downward channel exists between the closed surface and the inner wall of the cylinder, this design helps reduce material retention areas where the mixing components cannot directly act. This allows material near the discharge hole to participate more fully in the mixing within the cylinder, reducing the possibility of insufficient mixing in certain areas leading to concentrated discharge and affecting the consistency of the discharged material composition. Attached Figure Description

[0014] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 Schematic diagram of the material feeding cylinder Figure 1 ; Figure 3 Schematic diagram of the material feeding cylinder Figure 2 ; Figure 4 This is a schematic diagram of the stirring assembly. Figure 5 This is a schematic diagram of the structure of the first tray; Figure 6 This is a schematic diagram of the second tray.

[0015] The components in the attached diagram are labeled as follows: 1. Frame; 2. Discharge hood; 3. Mixing cylinder; 4. Discharge hole; 5. Sealing frame; 6. Cover; 7. Tilting drive device; 8. Boss; 9. First scraper; 10. Second scraper; 11. Elastic connector; 12. First support plate; 13. First pull rope; 14. Second pull rope; 15. Slip ring; 16. Displacement device; 17. Scraper; 18. Second support plate; 19. Guide rod; 20. Guide hole; 21. Limiting component; 22. Elastic support device; 23. Rotating ring; 24. Reciprocating rotation drive device; 25. Groove; 26. Brush; 27. Screw conveyor mechanism; 28. Motor; 29. ​​First transmission wheel; 30. Transmission belt; 31. Second transmission wheel; 32. Central shaft; 33. First support rod; 34. First stirring ring; 35. Second stirring ring; 36. Rotating seat; 37. Locking component; 38. Detailed Implementation

[0016] like Figures 1-6As shown, this invention discloses a compound fertilizer mixing device, including a frame 1, a material discharge hood 2 mounted on the frame 1, and a mixing cylinder 3 disposed inside the material discharge hood 2. The frame 1 supports the material discharge hood 2 and the mixing cylinder 3. In this embodiment, the mixing cylinder 3 is installed above the inner side of the material discharge hood 2. A stirring assembly is provided inside the mixing cylinder 3 to mix the materials inside the mixing cylinder 3. It is understood that in this embodiment, the stirring assembly can at least stir the materials in all parts of the mixing cylinder 3 to achieve uniform mixing. The opening of the material discharge hood 2 faces upwards to receive the materials released from the mixing cylinder 3. The mixing cylinder 3 is cylindrical and horizontally positioned at the upper opening of the discharge hood 2. A rectangular discharge hole 4 is formed on the lower wall of the mixing cylinder 3. A sealing frame 5 is installed around the discharge hole 4 on its outer side, meaning the shape of the sealing frame 5 is basically the same as that of the discharge hole 4. The sealing frame 5 is made of elastic material and can adapt to small deviations in the mating parts through contact deformation. When the cover 6 covers the discharge hole 4, the sealing frame 5 is used to fit against the sealing surface of the cover 6 to seal the discharge hole 4. The cover 6 is hinged to one end of the discharge hole 4 along its length. The cover 6 fits into the discharge hole 4 after being flipped. The cover 6 is an arc-shaped plate structure adapted to the diameter of the mixing cylinder 3, and its length extension direction is consistent with the length extension direction of the discharge hole 4. One end of the cover 6 is hinged to the mixing cylinder 3. A flipping drive device 7 is installed between the cover 6 and the mixing cylinder 3. The flipping drive device 7 can control the cover 6 to flip around the axis to open or close the discharge hole 4. A boss 8 is installed on the inner side of the cover 6. A sealing surface corresponding to the sealing frame 5 is formed around the boss 8 on the inner side of the cover 6. The size of the boss 8 is adapted to the size of the discharge hole 4. By setting the discharge hole 4 on the lower side of the horizontally placed mixing cylinder 3 and using the arc-shaped cover 6 with the boss 8 to close it, the boss 8 is embedded in the discharge hole 4 when the cover 6 is closed, occupying the recessed space that the discharge part could originally accommodate material. Compared with the discharge structure where there is a downward channel between the closing surface and the inner wall of the cylinder, this setting helps to reduce the material retention area that is difficult for the stirring components to act directly, so that the material near the discharge hole 4 can participate more fully in the mixing inside the cylinder, reducing the possibility of insufficient local material mixing and concentrated discharge, which affects the consistency of the discharge composition.

[0017] The cover 6 is equipped with a cleaning component for cleaning the sealing surface. The cleaning component reduces the possibility of residual particles getting stuck between the sealing surface and the sealing frame 5, which would hinder the fit. This combination of reducing material retention and maintaining a closed state can prevent the sealing failure caused by material staying on the sealing surface.

[0018] In this embodiment of the invention, the elastic material of the sealing frame 5 can be rubber or silicone rubber, and the flipping drive device 7 can be a geared motor 28 that is connected to the hinge shaft of the cover 6, or an electric push rod whose two ends are respectively hinged to the mixing cylinder 3 and the cover 6.

[0019] In this embodiment, the cleaning component includes a first scraper 9 and a second scraper 10 disposed on both sides of the boss 8. The sliding direction of the first scraper 9 and the second scraper 10 is along the length direction of the cover 6, and they are used to clean the sealing surfaces on both sides of the boss 8. The first scraper 9 and the second scraper 10 are both block-shaped structures, and the bottom of their sides facing the rotating shaft are chamfered, which allows them to slide more smoothly on the sealing surface. The first scraper 9 and the second scraper 10 are respectively connected to the two ends of the first support plate 12 through elastic connectors 11. The curvature of the first support plate 12 is consistent with the curvature of the cover 6. The first support plate 12 is installed on the back side of the cover 6 along the width direction of the cover 6. The first support plate 12 can move along the length direction of the cover 6. The two ends of the first support plate 12 are respectively connected to the two ends of the slip ring 15 through the first pull rope 13 and the second pull rope 14. The first pull rope 13 and the second pull rope 14 are elastic pull ropes. The slip ring 15 is slidably installed on the outside of the mixing cylinder 3. Two pull ropes connect the two ends of the first support plate 12 to the slip ring 15, distributing the traction force on both sides of the support plate, which helps reduce the skew caused by unilateral traction. The position of the slip ring 15 is adjusted according to the flipping position of the cover 6, so that the traction position of the pull rope can adapt to the changes in the posture of the cover 6, avoiding the traction point being always fixed and limiting the effective cleaning range of the scraper. A displacement device 16 is installed on the mixing cylinder 3 to drive the slip ring 15 to move. The position of the slip ring 15 on the mixing cylinder 3 corresponds to the flipping position of the cover 6. When the cover 6 is flipped to the vertical plane, the slip ring 15 is located directly above the rotating shaft. The first support plate 12 connected to the slip ring 15 can drive the first scraper 9 and the second scraper 10 to move to the top of the cover 6, thereby cleaning the sealing surfaces on both sides near the rotating shaft. When the cover 6 is flipped to the horizontal plane, the slip ring 15 can also drive the first support plate 12 to adapt to the displacement, so that the first scraper 9 and the second scraper 10 can clean the sealing surfaces on both sides of the boss 8 along the length direction of the cover 6, reducing the jamming of the device. In this embodiment of the invention, the displacement device 16 may be a gear and rack mechanism or a screw and nut mechanism driven by a motor 28, and the elastic pull rope may be a rubber core braided rope or a polyurethane elastic rope.

[0020] In this embodiment, a scraper 17 is installed on the sealing surface. The scraper 17 extends along the width direction of the cover 6 and is located on the surface of the sealing surface away from the rotating shaft. The scraper 17 can clean the sealing surface at the outer end. The two ends of the scraper 17 are respectively connected to the two ends of the second support plate 18 through elastic connectors 11. The second support plate 18 is installed on the back side of the cover 6 along the width direction of the cover 6. A first magnetic block is installed on the side of the scraper 17 facing the boss 8. A second magnetic block corresponding to the first magnetic block is installed on the boss 8. A third magnetic block corresponding to the first magnetic block is installed on the first scraper block 9 and the second scraper block 10. When the first scraper block 9 and the second scraper block 10 move to the right and contact the scraper 17, the first scraper block 9 and the second scraper block 10 continuously drive the scraper 17 to move to the right until the first magnetic block and the second magnetic block disengage, thereby cleaning the sealing surface at the end. When the first scraper block 9 and the second scraper block 10 return, the scraper 17 returns to the left under the connection of the first magnetic block and the third magnetic block until the first magnetic block and the second magnetic block are attracted again, and the first scraper block 9 and the second scraper block 10 disengage from the scraper 17. The first scraper block 9 and the second scraper block 10 continue to move to the left. Under the condition that the magnetic attraction force, moving resistance and driving force are matched, the existing reciprocating motion of the scraper blocks on both sides can be used to drive the end scraper 17 to clean and reset, reducing the need to set up an independent drive for the end scraper 17, and making the cleaning action of the two sides and the end form a connection, providing a cleaner contact area for the subsequent bonding of the sealing frame 5 and the sealing surface. Among them, the first magnetic block, the second magnetic block and the third magnetic block can be neodymium iron boron permanent magnet blocks or ferrite permanent magnet blocks with anti-corrosion encapsulation, and the scraper 17 can be a strip scraper 17 with polyurethane scraping edge or a strip scraper 17 with wear-resistant plastic scraping edge.

[0021] In this embodiment, the elastic connector 11 includes an L-shaped guide rod 19. One end of the guide rod 19 is connected to the scraper 17, and the other end of the guide rod 19 slides through the guide hole 20 on the second support plate 18 and is connected to the limiting member 21. The end of the guide rod 19 connected to the second support plate 18 is perpendicular to the second support plate 18. An elastic support device 22 is installed between the limiting member 21 and the second support plate 18. The elastic support device 22 is a support spring. By adopting an elastic connection method, the surface of the scraper 17 can make elastic contact with the sealing surface, which can improve the cleaning effect.

[0022] When the scraper 17 passes over local particles or areas with slightly varying mating heights on the sealing surface, the guide rod 19 can move along the guide hole 20, allowing the scraper 17 to retract appropriately and preventing a sudden increase in resistance caused by rigid clamping. After passing over the area, the elastic support device 22 provides a restoring effect, allowing the scraper 17 to continue to maintain contact with the sealing surface.

[0023] In this embodiment, a rotating ring 23 is rotatably mounted on the mixing cylinder 3. The rotating ring 23 corresponds to the surface position of the sealing surface near the rotating shaft end. The rotating ring 23 is connected to a reciprocating rotation drive device 24. A groove 25 is opened on the inner side of the lower end of the rotating ring 23. Brushes 26 are installed on both the inner and outer surfaces of the groove 25. The brushes 26 on the outer surface are used to clean impurities on the sealing surface.

[0024] The sealing surface near the rotating shaft is located differently from the sealing surfaces on both sides and the far end. Directly extending the stroke of the lateral scraper or the end scraper 17 may not be able to cover this area. Using an independent reciprocating brushing path helps to supplement the coverage of the original cleaning structure. The bristles can bend when in contact with the sealing surface to sweep away local fine particles. This, combined with the scraping action of the scraper and scraper 17, reduces the situation where residual material at one end affects the fit of the sealing frame 5. The groove 25 allows the bristles to be arranged in sections according to the inner and outer surfaces, providing installation space for cleaning the corresponding positions. The cleaning action of the sealing surface near the rotating shaft is undertaken by the outer bristles 26. The reciprocating drive device 24 can be a geared motor 28 capable of forward and reverse rotation with a gear transmission mechanism, or a swing cylinder with a transmission mechanism. The bristles 26 can be nylon bristle brushes or polypropylene bristle brushes.

[0025] In this embodiment, a screw conveyor mechanism 27 is installed on the discharge hood 2. The screw conveyor mechanism 27 is used to output the material inside the discharge hood 2 to the outside. By setting the screw conveyor mechanism 27, the material falling from the mixing cylinder 3 can be conveyed to the outside along a defined path, so that the unloading process after mixing in the cylinder is connected with the subsequent transfer process.

[0026] In this embodiment, the stirring device includes a motor 28, a first drive wheel 29, a drive belt 30, a second drive wheel 31, a central shaft 32, a first support rod 33, a first stirring ring 34, a second support rod 35, and a second stirring ring 36. The motor 28 is installed on the outside of the material discharge hood 2. The output end of the motor 28 is connected to the first drive wheel 29. The first drive wheel 29 is connected to the second drive wheel 31 through the drive belt 30. The second drive wheel 31 is coaxially connected to the central shaft 32. The central shaft 32 is coaxially installed at the center of the mixing cylinder 3. The first support rod 33 and the second support rod 35 are installed on the outside of the central shaft 32. The outer ends of the first support rod 33 and the second support rod 35 are respectively connected to the first stirring ring 34 and the second stirring ring 36. The first stirring ring 34 and the second stirring ring 36 are both spiral ring structures with opposite rotation directions. The outer spiral diameter of the first stirring ring 34 is smaller than the inner spiral diameter of the second stirring ring 36. The outer spiral diameter of the second stirring ring 36 is adapted to the inner diameter of the mixing cylinder 3.

[0027] The outer diameter of the first stirring ring 34 is smaller than the inner diameter of the second stirring ring 36, creating a radial gap between them and reserving space for the movement and exchange of materials in different areas. The outer diameter of the second stirring ring 36 is adapted to the inner diameter of the mixing cylinder 3, which helps to extend the stirring effect to the area near the cylinder wall. The combined action of the two stirring rings can cause the materials at different radial positions to be turned over, and the spiral structure can be used to generate an axial pushing effect on the materials, thereby improving the mixing effect.

[0028] In this embodiment, rotating seats 37 are fixedly installed at both ends of the discharge hood 2. The two ends of the mixing cylinder 3 are respectively rotatably engaged with the two rotating seats 37. The rotating seats 37 and the mixing cylinder 3 can be fixed together by locking members 38. By rotating the mixing cylinder 3 around its axis, the circumferential position of the discharge hole 4 and the cover 6 on the mixing cylinder 3 can be changed, preventing the material from staying in the same position for too long. This can promote the redistribution of the material originally located in that area without changing the cylinder posture by tilting the entire frame 1. Since the cylinder is adjusted around its own axis, it can maintain its basic coaxial arrangement with the central axis 32. After the adjustment is completed, it is fixed by locking members 38, which helps to reduce the situation of the cylinder moving unexpectedly around the axis during the mixing process.

Claims

1. A compound fertilizer mixing device, characterized in that: The device includes a frame, a discharge hood mounted on the frame, and a mixing cylinder located inside the discharge hood. A stirring assembly is installed inside the mixing cylinder. The discharge hood has an upward-facing opening. The mixing cylinder is cylindrical and horizontally positioned at the upper opening of the discharge hood. A rectangular discharge hole is formed on the lower wall of the mixing cylinder. A sealing frame, made of elastic material, is installed around the discharge hole on its outer side. A cap, which is an arc-shaped plate structure adapted to the diameter of the mixing cylinder, is hinged to one end of the discharge hole. A tilting drive device is installed between the cap and the mixing cylinder. A boss is installed on the inner surface of the cap, forming a sealing surface corresponding to the sealing frame around the boss on the inner side of the cap. The size of the boss is adapted to the size of the discharge hole. When the cap closes the discharge hole, the boss can fit into the inner side of the discharge hole. A cleaning assembly for cleaning the sealing surface is installed on the cap.

2. The compound fertilizer mixing device according to claim 1, characterized in that: The cleaning assembly includes a first scraper and a second scraper disposed on both sides of the boss. The first scraper and the second scraper are respectively connected to the two ends of the first support plate through elastic connectors. The first support plate is installed on the back side of the cover along the width direction of the cover. The two ends of the first support plate are respectively connected to the two ends of the slip ring through a first pull rope and a second pull rope. The first pull rope and the second pull rope are elastic pull ropes. The slip ring is slidably installed on the outside of the mixing cylinder. A displacement device for driving the slip ring to move is installed on the mixing cylinder. The position of the slip ring on the mixing cylinder corresponds to the flip position of the cover.

3. The compound fertilizer mixing device according to claim 2, characterized in that: A scraper is installed on the sealing surface, extending along the width direction of the cover. The scraper is located on the surface of the sealing surface away from the rotating shaft. The two ends of the scraper are connected to the two ends of the second support plate through elastic connectors. The second support plate is installed on the back side of the cover along the width direction of the cover. A first magnetic block is installed on the side of the scraper facing the boss. A second magnetic block corresponding to the first magnetic block is installed on the boss. A third magnetic block corresponding to the first magnetic block is installed on the first scraper and the second scraper.

4. The compound fertilizer mixing device according to claim 3, characterized in that: The elastic connector includes an L-shaped guide rod, one end of which is connected to the scraper, and the other end of which slides through a guide hole on the second support plate and is connected to a limiting member. The end of the guide rod connected to the second support plate is perpendicular to the second support plate, and an elastic support device is installed between the limiting member and the second support plate.

5. A compound fertilizer mixing device according to claim 4, characterized in that: A rotating ring is rotatably mounted on the mixing cylinder. The rotating ring corresponds to the surface of the sealing surface near the shaft end. The rotating ring is connected to a reciprocating rotation drive device. A groove is opened on the inner side of the lower end of the rotating ring. Brushes are installed on both the inner and outer surfaces of the groove. The brush on the outer surface is used to clean impurities on the sealing surface.

6. The compound fertilizer mixing device according to claim 1, characterized in that: The material discharge hood is equipped with a screw conveyor mechanism, which is used to output the material inside the material discharge hood to the outside.

7. A compound fertilizer mixing device according to any one of claims 1-6, characterized in that: The mixing device includes a motor, a first drive wheel, a drive belt, a second drive wheel, a central shaft, a first support rod, a first stirring ring, a second support rod, and a second stirring ring. The motor is installed on the outside of the material discharge hood, and the output end of the motor is connected to the first drive wheel. The first drive wheel is connected to the second drive wheel via a drive belt, and the second drive wheel is coaxially connected to the central shaft. The central shaft is coaxially installed at the center of the mixing cylinder. The first support rod and the second support rod are installed on the outside of the central shaft. The outer ends of the first support rod and the second support rod are respectively connected to the first stirring ring and the second stirring ring. Both the first stirring ring and the second stirring ring are spiral ring structures. The outer diameter of the first stirring ring is smaller than the inner diameter of the second stirring ring, and the outer diameter of the second stirring ring is adapted to the inner diameter of the mixing cylinder.

8. A compound fertilizer mixing device according to claim 7, characterized in that: Rotary seats are fixedly installed at both ends of the discharge hood. The two ends of the mixing cylinder are respectively rotatably engaged with the two rotating seats. The rotating seats and the mixing cylinder can be fixed by locking parts. By rotating the mixing cylinder around the axis of the mixing cylinder, the circumferential position of the discharge hole and the cover on the mixing cylinder can be changed.

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