Three-axis mixing device and method for producing trace element-containing fertilizer

Abstract

The application discloses a three-shaft mixing device for producing trace element-containing fertilizer and a method thereof, and relates to the technical field of material mixing.The device comprises a mixing box, a feeding box is installed above the mixing box, and an extrusion assembly in the mixing box comprises a first extrusion roller, a second extrusion roller and an extrusion driving assembly.The second extrusion roller is located below the first extrusion roller.The first extrusion roller comprises a first roller shaft, a sleeve, a first roller tooth and a contraction assembly.The output end of the extrusion driving assembly is in transmission connection with the first roller shaft.The sleeve is coaxially fixed on the first roller shaft.The first roller tooth penetrates through the sleeve and is in sliding connection with the sleeve.When the first roller tooth rotates to the position of the side wall of the mixing box, the first roller tooth slides to the position where the outer end surface of the first roller tooth is located inside the outer surface of the sleeve under the driving of the contraction assembly, and the outer surface of the sleeve is attached to the side wall of the mixing box.A stirring assembly is further arranged in the mixing box and is used for mixing and stirring the extruded raw materials.The application realizes the fractional extrusion of granular raw materials.

Description

Technical Field

[0001] This invention belongs to the field of material mixing technology, specifically relating to a triaxial mixing device and method for producing fertilizers containing trace elements. Background Technology

[0002] Micronutrient fertilizers are key agricultural inputs for ensuring balanced crop growth, improving soil fertility, and enhancing the quality of agricultural products, and are widely used in modern agricultural planting. The raw materials for the production of this type of fertilizer are mostly mineral salts, oxides, and compound salt mixtures such as calcium, magnesium, sulfur, and silicon. The production process requires mixing various raw materials with different physicochemical properties.

[0003] Currently, the traditional single-stirring structure used in the production of micronutrient fertilizers mechanically turns over various raw material particles, lacking the ability to effectively disperse and loosen clumps. Therefore, when faced with raw materials that have agglomerated or clumped during storage and transportation, traditional stirring equipment struggles to break up these clumps, resulting in uneven particle size in the mixed fertilizer raw materials. This directly affects the precision of subsequent mixing and granulation processes, leading to uneven nutrient distribution, poor water solubility, and a significant reduction in fertilizer utilization. Summary of the Invention

[0004] The purpose of this invention is to provide a simple and rationally designed triaxial mixing device and method for producing fertilizers containing micronutrients in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] In a first aspect, the present invention provides a triaxial mixing device for the production of fertilizers containing trace elements, comprising:

[0007] A mixing chamber is provided, with a feed box installed above it for feeding premixed granular raw materials into the mixing chamber. An extrusion assembly is installed inside the mixing chamber, comprising a first extrusion roller, a second extrusion roller, and an extrusion drive assembly. The two first extrusion rollers are symmetrically arranged, and the second extrusion roller is located below the first extrusion rollers and meshes with both first extrusion rollers. The second extrusion roller is rotatably installed inside the mixing chamber. The first extrusion roller includes a first roller shaft, a sleeve, first roller teeth, and a shrinking assembly. The output end of the extrusion drive assembly is drive-connected to the first roller shaft. The sleeve is coaxially fixedly installed on the first roller shaft. Multiple first roller teeth penetrate the sleeve and are slidably connected to the sleeve. The output end of the shrinking assembly is drive-connected to the inner end of the first roller teeth. When the first roller teeth rotate to the side wall of the mixing chamber, under the drive of the shrinking assembly, the first roller teeth slide towards the inside of the sleeve until the outer end face of the first roller teeth is located inside the outer surface of the sleeve, and the outer surface of the sleeve is in contact with the side wall of the mixing chamber.

[0008] The mixing chamber is also equipped with a stirring assembly, which is located below the second extrusion roller and is used to mix and stir the extruded raw materials.

[0009] As a further optimization of the present invention, the extrusion drive assembly includes an extrusion drive component and meshing gears. The input end of the first roller shaft is fixedly connected to the meshing gears, and the two meshing gears mesh with each other for transmission. The output end of the extrusion drive component is connected to one of the first roller shafts for transmission.

[0010] As a further optimization of the present invention, the shrinking assembly includes a clamping plate, a connecting shaft, rollers, and an end plate. A clamping plate coaxially arranged is fixedly installed on the first roller shaft. The clamping plate is located inside the sleeve and fixedly connected to the sleeve. A limiting groove is also formed on the clamping plate. The extending direction of the limiting groove is consistent with the sliding direction of the first roller tooth and the sleeve. A connecting shaft is fixedly connected to the inner end of the first roller tooth. The connecting shaft slides with the clamping plate through the limiting groove. Rollers are rotatably installed at both ends of the connecting shaft. The end plate is fixedly installed on the mixing box. A rolling groove is formed on the side of the end plate facing the sleeve. The distance between the rolling groove between the first roller shaft and the side wall of the mixing box and the axis of the first roller shaft is less than the distance between the rolling groove on the side of the first roller shaft away from the side wall of the mixing box and the axis of the first roller shaft. The roller slides along the rolling groove. The two ends of the first roller shaft pass through the corresponding end plates and rotate with the end plates.

[0011] As a further optimization of the present invention, the extending direction of the limiting groove intersects the radial direction of the sleeve.

[0012] As a further optimization of the present invention, a sealing cover is fixedly provided on the side of the end plate away from the sleeve, and an oil injection pipe is provided on the sealing cover. The oil injection pipe is connected to the groove for injecting lubricating oil into the groove.

[0013] As a further optimization of the present invention, a purging assembly is also included. The purging assembly includes a blower and an air collecting hood. An air chamber is formed inside the first roller shaft, and a blowing hole is formed on the portion of the first roller shaft located inside the sleeve. The blowing hole is located between adjacent card plates. The output end of the blower is connected to the air collecting hood. The air collecting hood is installed on the outside of the mixing box, and the air chamber is connected to the air collecting hood. An air outlet is formed at the end of the first roller shaft away from the air collecting hood, and the radial cross-sectional area of ​​the air outlet is smaller than the radial cross-sectional area of ​​the air chamber.

[0014] As a further optimization of the present invention, the second extrusion roller includes a second roller shaft and a second roller tooth. The second roller shaft is rotatably mounted on the mixing box. A plurality of second roller teeth are fixedly arranged on the second roller shaft. The second roller teeth and the first roller teeth are alternately distributed. A cavity is opened inside the second roller shaft. A rotary connector is installed at one end of the second roller shaft to supply coolant into the cavity. The other end of the second roller shaft is connected to a drain pipe.

[0015] As a further optimization of the present invention, a feeding hopper is provided on one side of the feeding box, and the feeding hopper is connected to the feeding box through a discharge port opened on the side of the feeding box.

[0016] A crankshaft is rotatably installed inside the feed box. A pressure drive is connected to the input end of the crankshaft. A cam is fixedly connected to the end of the crankshaft away from the pressure drive. A connecting rod is rotatably connected to the crank part of the crankshaft. A pressure plate is rotatably installed at the other end of the connecting rod. The pressure plate is located below the crankshaft and slides against the side wall of the feed box. A baffle is fixedly provided on the edge of the pressure plate. When the pressure plate moves down to its maximum displacement, the discharge port is closed due to the sealing of the baffle.

[0017] As a further optimization of the present invention, the feeding hopper includes an inclined feeding channel, and a scraper conveyor is provided in the feeding channel for scraping and conveying the granular raw materials in the feeding channel toward the discharge port.

[0018] Secondly, the present invention also provides a method for use in the above-mentioned triaxial mixing device for the production of fertilizers containing trace elements, the method comprising the following steps:

[0019] The premixed granular raw materials are fed into the mixing box through the feed box;

[0020] The granular raw material is graded and extruded by the interlocking of two first extrusion rollers and the interlocking of the first extrusion roller and the second extrusion roller. The sleeve of the first extrusion roller is in contact with the side wall of the mixing box. When the first roller tooth rotates to the position of the side wall of the mixing box, the first roller tooth is driven to slide towards the inside of the sleeve by the shrinking component, so that the outer end face of the first roller tooth is located on the inner side of the outer surface of the sleeve.

[0021] The extruded raw materials are thoroughly mixed using a stirring assembly.

[0022] The present invention has at least the following beneficial effects: The present invention provides a triaxial mixing device and method for producing fertilizer containing trace elements. By setting a first extrusion roller, a second extrusion roller and an extrusion drive assembly in the mixing chamber, the second extrusion roller is located below the first extrusion roller and meshes with the two first extrusion rollers respectively, and the two first extrusion rollers mesh with each other, realizing multi-stage extrusion decomposition of premixed granular raw materials. Thus, when the stirring assembly is stirring, the granular raw materials are easily stirred and mixed evenly. The outer surface of the sleeve of the first extrusion roller is in contact with the inner side wall of the mixing chamber, and the first roller teeth can slide into the sleeve at this contact point, so that there is no gap between the sleeve and the side wall of the mixing chamber. This prevents the granular raw materials falling from above from falling directly through this gap and agglomerating and mixing with other decomposed raw materials, resulting in uneven particle size. This ensures that the particle size of the material is uniform, thereby ensuring the accuracy of subsequent mixing and granulation processes, making the fertilizer nutrients evenly distributed and improving fertilizer utilization.

[0023] In addition, a purging assembly is provided, including a blower and an air collection hood. The air collection hood supplies air to the air chambers of the two first roller shafts, and the air is then blown into the space between adjacent plates through the blow holes. As a result, airflow is generated at the sliding gap between the first roller teeth and the sleeve under the action of air pressure, thereby effectively preventing raw material powder from falling into the sliding gap and ensuring the smooth sliding of the first roller teeth.

[0024] In addition, the blown gas is a low-temperature gas to wrap around the first roller teeth and the contact sleeve to cool the first roller teeth. Furthermore, coolant is supplied to the cavity inside the second roller shaft through the rotating connector to cool the second roller shaft and the second roller teeth, preventing the granular raw materials from softening and sticking due to extrusion and friction. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is the invention Figure 1 A partial sectional view of the structure;

[0027] Figure 3 This is the invention Figure 2 A partial cross-sectional view of the mixing chamber and extrusion assembly;

[0028] Figure 4 This is another partial cross-sectional view of the mixing box and extrusion assembly of the present invention;

[0029] Figure 5 This is the present invention. Figure 4 A schematic diagram of the front structure;

[0030] Figure 6This is a partial structural diagram of the mixing chamber and extrusion assembly after the sealing cover of the present invention has been removed;

[0031] Figure 7 This is a partial cross-sectional structural schematic diagram of the feed box, pressing drive, crankshaft, connecting rod, pressure plate, feeding hopper, scraper conveyor and flapper of the present invention.

[0032] In the diagram: 1. Mixing box; 101. Extrusion drive component; 102. Meshing gear; 103. First roller shaft; 11. First roller tooth; 12. Sleeve; 13. Connecting shaft; 14. Clamping plate; 141. Limiting groove; 15. Roller; 16. End plate; 161. Roll groove; 17. Oil injection pipe; 18. Sealing cover; 19. Second roller shaft; 191. Cavity; 110. Second roller tooth; 111. Rotary connector; 2. Mixing assembly; 3. Feed box; 31. Pressing drive component; 32. Crankshaft; 33. Connecting rod; 34. Cam; 35. Pressure plate; 351. Baffle rim; 36. Guard plate; 4. Feed hopper; 41. Scraper conveyor component; 42. Feeding channel; 43. Flip plate; 5. Blowing assembly; 51. Blowing hole; 52. Air chamber; 53. Air collection hood; 54. Blower. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0034] In the description of the embodiments of this application, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] like Figure 1 , Figure 2 As shown, the present invention provides a triaxial mixing device for the production of fertilizers containing trace elements, comprising:

[0036] A mixing chamber 1 is provided, with a feed box 3 installed above it for feeding premixed granular raw materials into the mixing chamber 1. An extrusion assembly is installed inside the mixing chamber 1, comprising a first extrusion roller, a second extrusion roller, and an extrusion drive assembly. The two first extrusion rollers are symmetrically arranged, and the second extrusion roller is located below the first extrusion rollers and engages with both first extrusion rollers. The second extrusion roller is rotatably mounted inside the mixing chamber 1. (Continue reading...) Figure 3 The first extrusion roller includes a first roller shaft 103, a sleeve 12, first roller teeth 11, and a shrinking assembly. The output end of the extrusion drive assembly is drivenly connected to the first roller shaft 103. The sleeve 12 is coaxially fixedly mounted on the first roller shaft 103. A plurality of first roller teeth 11 penetrate the sleeve 12 and are slidably connected to the sleeve 12. The output end of the shrinking assembly is drivenly connected to the inner end of the first roller teeth 11. (Continue reading...) Figure 4 When the first roller tooth 11 rotates to the side wall position of the mixing box 1, under the drive of the shrinking assembly, the first roller tooth 11 slides towards the inside of the sleeve 12 until the outer end face of the first roller tooth 11 is located inside the outer surface of the sleeve 12, and the outer surface of the sleeve 12 is in contact with the side wall of the mixing box 1.

[0037] The mixing chamber 1 is also equipped with a stirring assembly 2, which is located below the second extrusion roller and is used to mix and stir the extruded raw materials. For example, the stirring assembly 2 includes a stirring motor, a stirring shaft, and stirring blades. The output end of the motor is driven and connected to the stirring shaft, and the stirring blades are fixedly connected to the part of the stirring shaft located inside the mixing chamber 1. The stirring of the multiple stirring blades is used to fully mix the raw materials whose particle size has been reduced after extrusion.

[0038] In the above embodiment, the pre-mixed granular raw material is fed into the mixing box 1 through the feed box 3. At this time, for raw materials that are agglomerated or clumped, after falling onto the paired first extrusion rollers, the first roller shaft 103 drives the first roller teeth 11 to rotate through the sleeve 12. The first roller teeth 11 of the two first extrusion rollers rotate in opposite directions. Figure 5Taking the orientation as an example, the first tooth 11 of the first extrusion roller on the left rotates clockwise, while the first tooth 11 of the first extrusion roller on the right rotates counterclockwise. This scoops the granular raw material to the biting point for extrusion and decomposition. Furthermore, under the support of the second extrusion roller, the granular raw material is extruded again by the second and first extrusion rollers, achieving multi-stage extrusion and decomposition of the premixed granular raw material. This allows the granular raw material to be easily stirred and mixed evenly when the mixing component 2 is stirring. Moreover, when the first tooth 11 rotates to the side wall of the mixing box 1, the first tooth 11 slides towards the inside of the sleeve 12. That is, the first tooth 11 at this point retracts into the sleeve 12, and there is no gap between the sleeve 12 and the side wall of the mixing box 1. This prevents the granular raw material falling from above from falling directly through this gap and agglomerating and mixing with other decomposed raw materials, which would result in uneven particle size. This ensures that the particle size of the material is uniform, thereby ensuring the accuracy of subsequent mixing and granulation processes, making the fertilizer nutrients evenly distributed, and improving fertilizer utilization.

[0039] For example, see [link to relevant documentation]. Figure 2 The extrusion drive assembly includes an extrusion drive component 101 and a meshing gear 102. The input end of the first roller shaft 103 is fixedly connected to the meshing gear 102. The two meshing gears 102 mesh with each other, driving the rotation of the two first roller shafts 103 in opposite directions. The output end of the extrusion drive component 101 is connected to one of the first roller shafts 103. For example, as... Figure 2 As shown, the extrusion drive 101 is a belt-driven drive structure, specifically including a motor, a belt, a driving pulley, and a driven pulley. The belt is sleeved on the driving pulley and the driven pulley. The output end of the motor is driven and connected to the driving pulley, while the driven pulley is fixedly installed at the input end of one of the first roller shafts 103. In other embodiments, the extrusion drive 101 is a reducer structure, specifically including a motor and a reducer. The motor is driven and connected to the input end of one of the first roller shafts 103 through the reducer; this is not limited here.

[0040] For example, see [link to relevant documentation]. Figure 3 , Figure 4 and Figure 6The shrinking assembly includes a clamping plate 14, a connecting shaft 13, rollers 15, and an end plate 16. The clamping plate 14 is fixedly mounted on the first roller shaft 103 and is coaxially arranged. The clamping plate 14 is located inside the sleeve 12 and is fixedly connected to the sleeve 12. The clamping plate 14 is also provided with a limiting groove 141. The extending direction of the limiting groove 141 is consistent with the sliding direction of the first roller tooth 11 and the sleeve 12. The inner end of the first roller tooth 11 is fixedly connected to the connecting shaft 13. The connecting shaft 13 is slidably engaged with the clamping plate 14 through the limiting groove 141. Rollers 15 are rotatably mounted on both ends of the connecting shaft 13. The end plate 16 is fixedly mounted on the mixing box 1. The end plate 16 has a rolling groove 161 on the side facing the sleeve 12. The rollers 15 slide along the rolling groove 161. The two ends of the first roller shaft 103 pass through the corresponding end plates 16 and are rotatably engaged with the end plates 16.

[0041] like Figure 6 As shown, the distance a between the groove 161 located between the first roller shaft 103 and the side wall of the mixing box 1 and the axis of the first roller shaft 103 is less than the distance A between the groove 161 located on the side of the first roller shaft 103 away from the side wall of the mixing box 1 and the axis of the first roller shaft 103. Therefore, when the sleeve 12 drives the first roller tooth 11 to rotate, the roller 15, under the guidance and constraint of the groove 161, causes the first roller tooth 11 to slide towards the inside of the sleeve 12 until the outer end face of the first roller tooth 11 is located inside the outer surface of the sleeve 12, that is, the first roller tooth 11 does not protrude outside the sleeve 12, so that the outer surface of the sleeve 12 is in contact with the side wall of the mixing box 1, thereby avoiding the gap between the first extrusion roller and the side wall of the mixing box 1.

[0042] It should be noted that, as Figure 3 As shown, multiple clamping plates 14 are provided, and the multiple clamping plates 14 are distributed in an orderly manner along the axis of the first roller shaft 103.

[0043] Continue reading Figure 4 and Figure 5 The extension direction of the limiting groove 141 intersects the radial direction of the sleeve 12, that is, the limiting groove 141 is inclined. At this time, the first roller teeth 11 are inclined and tilted forward along the rotation direction of the first roller teeth 11, so that the symmetrically distributed first roller teeth 11 can bite each other and pull down and squeeze the granular raw material.

[0044] For example, see [link to relevant documentation]. Figure 3 A sealing cover 18 is fixedly installed on the side of the end plate 16 away from the sleeve 12. An oil injection pipe 17 is provided on the sealing cover 18. The oil injection pipe 17 is connected to the groove 161 for injecting lubricating oil into the groove 161. During regular maintenance, lubricating oil is injected into the groove 161 through the oil injection pipe 17. As the roller 15 rolls along the groove 161, the lubricating oil is evenly coated on the groove surface of the groove 161, so that the roller 15 rolls smoothly along the groove 161 during subsequent extrusion and decomposition.

[0045] For example, see [link to relevant documentation]. Figure 1 , Figure 2 and Figure 3 The device also includes a purging assembly 5, which includes a blower 54 and an air collecting hood 53. An air chamber 52 is provided inside the first roller shaft 103, and a blowing hole 51 is provided on the part of the first roller shaft 103 located inside the sleeve 12. The blowing hole 51 is located between adjacent clamping plates 14. The output end of the blower 54 is connected to the air collecting hood 53. The air collecting hood 53 is installed on the outside of the mixing box 1, and the air chamber 52 is connected to the air collecting hood 53. An air outlet is provided at the end of the first roller shaft 103 away from the air collecting hood 53. The radial cross-sectional area of ​​the air outlet is smaller than the radial cross-sectional area of ​​the air chamber 52, so that the air chamber 52 is in a positive pressure state. The blower 54 supplies gas into the air chambers 52 in the two first roller shafts 103 through the air collector 53. The gas is blown into the space between the adjacent clamping plates 14 through the blow hole 51. Under the action of air pressure, airflow is generated at the sliding gap between the first roller teeth 11 and the sleeve 12, thereby effectively preventing raw material powder from falling into the sliding gap and ensuring the smooth sliding of the first roller teeth 11.

[0046] It should be noted that the extrusion friction of the first roller tooth 11 on the granular raw material easily generates heat. However, the thermal stability of trace elements (such as boron, zinc, iron, manganese, etc.) and their salts (sulfates, oxides, mineral salts) is limited. High temperature can easily lead to the volatilization, decomposition or failure of nutrients. Therefore, it is necessary to cool down the first roller tooth 11. Gas is blown into the space between adjacent clamping plates 14 through the blowhole 51. For example, the gas is a low temperature gas, such as gas temperature of 10℃~15℃. The low temperature gas surrounds the first roller tooth 11 and the contact sleeve 12 to cool down the first roller tooth 11 and prevent the granular raw material from softening and sticking due to heat.

[0047] For example, see [link to relevant documentation]. Figure 3 and Figure 4 The second extrusion roller includes a second roller shaft 19 and a second roller tooth 110. The second roller shaft 19 is rotatably mounted on the mixing box 1. A plurality of second roller teeth 110 are fixedly arranged on the second roller shaft 19. The second roller teeth 110 and the first roller teeth 11 are alternately distributed. A cavity 191 is opened inside the second roller shaft 19. A rotary connector 111 is installed at one end of the second roller shaft 19 to supply coolant into the cavity 191. The other end of the second roller shaft 19 is connected to a drain pipe. The coolant is supplied into the cavity 191 through the rotary connector 111 and discharged through the drain pipe, thereby cooling the second roller shaft 19 and the second roller tooth 110.

[0048] It should be noted that the second roller shaft 19 rotates freely on the mixing box 1. Under the pressure of the first roller teeth 11 on both sides, the material on the heavier side will rotate towards that side. That is, the rotation of the second roller shaft 19 is uncertain, so as to unload the material.

[0049] For example, see [link to relevant documentation]. Figure 2 A feeding hopper 4 is provided on one side of the feeding box 3, and the feeding hopper 4 is connected to the feeding box 3 through a discharge port opened on the side of the feeding box 3.

[0050] Continue reading Figure 2 and Figure 7 A crankshaft 32 is rotatably installed inside the feed box 3. The input end of the crankshaft 32 is connected to a pressing drive 31. A cam 34 is fixedly connected to the end of the crankshaft 32 away from the pressing drive 31. A guard plate 36 is provided on the outer side of the cam 34. The guard plate 36 is fixedly installed on the feed box 3 to protect the rotation of the cam 34. A connecting rod 33 is rotatably connected to the crank part of the crankshaft 32. A pressure plate 35 is rotatably installed at the other end of the connecting rod 33. The pressure plate 35 is located below the crankshaft 32 and slides against the side wall of the feed box 3. A baffle 351 is fixedly provided on the edge of the pressure plate 35. When the pressure plate 35 moves down to its maximum displacement, the discharge port is closed under the blocking of the baffle 351, thereby squeezing the material quantitatively fed into the feed box 3. Under the pressure of the pressure plate 35, the material moves downward. For example, the pressing drive 31 is a belt-driven drive structure, specifically including a motor, a belt, a driving pulley, and a driven pulley. The belt is sleeved on the driving pulley and the driven pulley. The output end of the motor is driven and connected to the driving pulley, while the driven pulley is fixedly installed on the input end of the crankshaft 32. In other embodiments, the pressing drive 31 is a reducer structure, specifically including a motor and a reducer. The motor is driven and connected to the input end of the crankshaft 32 through the reducer; this is not limited here.

[0051] The feeding hopper 4 includes an inclined feeding channel 42, and a scraper conveyor 41 is provided in the feeding channel 42 to scrape the granular raw materials in the feeding channel 42 toward the discharge port.

[0052] Among them, the scraper conveyor 41 is a scraper conveying structure, specifically including a motor, a scraper chain, a drive gear, and a driven gear. The output end of the motor is connected to the drive gear, and the scraper chain is meshed on the drive gear and the driven gear. The downward return direction of the scraper chain is set towards the discharge port.

[0053] For example, a flap 43 is rotatably installed at the discharge port. A torsion spring is sleeved on the rotating connecting shaft between the flap 43 and the feeding channel 42. When the pressure plate 35 moves down, the pressure plate 35 presses down on the flap 43 to further block the discharge port from continuing to discharge.

[0054] It should be noted that, in use, the premixed granular raw materials are poured into the feeding hopper 4 and conveyed by the scraper conveyor 41, falling into the feed box 3 through the discharge port and landing above the first extrusion roller. Under the drive of the pressing drive 31, the crankshaft 32 drives the pressure plate 35 to move downward through the connecting rod 33, pressing the granular material downward.

[0055] Driven by the extrusion drive 101, the meshing gears 102 mesh with each other, and the first roller shaft 103 drives its respective sleeve 12 and first roller teeth 11 to rotate, extruding the granular raw material. With the cooperation of the second roller teeth 110, the granular raw material is graded and extruded. At this time, under the guidance and constraint of the groove 161 located between the first roller shaft 103 and the side wall of the mixing box 1, the roller 15 drives the connecting shaft 13 to slide along the limiting groove 141, so that the first roller teeth 11 slide towards the inside of the sleeve 12 until the outer end face of the first roller teeth 11 is located inside the outer surface of the sleeve 12, so that the outer surface of the sleeve 12 is in contact with the side wall of the mixing box 1, thereby avoiding the gap between the first extrusion roller and the side wall of the mixing box 1.

[0056] Furthermore, the blower 54 is started, and gas is supplied to the air chambers 52 in the two first roller shafts 103 through the air collection hood 53. The gas is blown into the space between the adjacent clamping plates 14 through the blowing hole 51. Under the action of air pressure, airflow is generated at the sliding gap between the first roller teeth 11 and the sleeve 12, which effectively prevents the raw material powder from falling into the sliding gap and ensures the smooth sliding of the first roller teeth 11. In addition, the blown gas is a low temperature gas, which surrounds the first roller teeth 11 and the contact sleeve 12 to cool down the first roller teeth 11.

[0057] In addition, coolant is supplied into the cavity 191 in the second roller shaft 19 by a pumping device, and the coolant cools the second roller shaft 19 and the second roller teeth 110.

[0058] After being graded, extruded, and decomposed, the granular raw materials fall onto the mixing component 2, where they are thoroughly and evenly mixed.

[0059] In another embodiment, the present invention also provides a method for use in a triaxial mixing device for the production of fertilizers containing micronutrients, the method comprising the following steps:

[0060] The premixed granular raw materials are fed into the mixing box 1 through the feed box 3;

[0061] The granular raw material is graded and extruded by the interlocking of two first extrusion rollers and the interlocking of the first extrusion roller and the second extrusion roller. The sleeve 12 of the first extrusion roller is in contact with the side wall of the mixing box 1. When the first roller tooth 11 rotates to the side wall position of the mixing box 1, the first roller tooth 11 is driven to slide towards the inside of the sleeve 12 by the shrinking component, so that the outer end face of the first roller tooth 11 is located inside the outer surface of the sleeve 12.

[0062] The extruded raw materials are thoroughly mixed by the stirring component 2.

[0063] This method involves pre-mixing multiple raw materials before stirring and then using a pair of first and second extrusion rollers in the mixing chamber 1 to perform graded extrusion and decomposition of the granular raw materials. This allows the granular raw materials to be easily stirred and mixed evenly when the stirring component 2 is in operation. When the pair of first extrusion rollers are in operation, the first roller teeth 11 slide towards the inside of the sleeve 12 as they rotate to the side wall of the mixing chamber 1. This means that the first roller teeth 11 retract into the sleeve 12, creating a seamless gap between the sleeve 12 and the side wall of the mixing chamber 1. This prevents the granular raw materials falling from above from directly dropping through this gap and mixing with other decomposed raw materials, which would result in uneven particle sizes. This ensures uniform particle size and guarantees the accuracy of subsequent mixing and granulation processes, resulting in uniform fertilizer nutrient distribution and improved fertilizer utilization.

[0064] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A triaxial mixing device for producing fertilizers containing trace elements, characterized in that, include: A mixing chamber is provided, with a feed box installed above it for feeding premixed granular raw materials into the mixing chamber. An extrusion assembly is installed inside the mixing chamber, comprising a first extrusion roller, a second extrusion roller, and an extrusion drive assembly. The two first extrusion rollers are symmetrically arranged, and the second extrusion roller is located below the first extrusion rollers and meshes with both first extrusion rollers. The second extrusion roller is rotatably installed inside the mixing chamber. The first extrusion roller includes a first roller shaft, a sleeve, first roller teeth, and a shrinking assembly. The output end of the extrusion drive assembly is drive-connected to the first roller shaft. The sleeve is coaxially fixedly installed on the first roller shaft. Multiple first roller teeth penetrate the sleeve and are slidably connected to the sleeve. The output end of the shrinking assembly is drive-connected to the inner end of the first roller teeth. When the first roller teeth rotate to the side wall of the mixing chamber, under the drive of the shrinking assembly, the first roller teeth slide towards the inside of the sleeve until the outer end face of the first roller teeth is located inside the outer surface of the sleeve, and the outer surface of the sleeve is in contact with the side wall of the mixing chamber. The mixing chamber is also equipped with a stirring assembly, which is located below the second extrusion roller and is used to mix and stir the extruded raw materials. The shrinking assembly includes a clamping plate, a connecting shaft, rollers, and an end plate. A clamping plate is fixedly mounted on the first roller shaft and is coaxially arranged. The clamping plate is located inside the sleeve and is fixedly connected to the sleeve. A limiting groove is also formed on the clamping plate. The extension direction of the limiting groove is consistent with the sliding direction of the first roller tooth and the sleeve. A connecting shaft is fixedly connected to the inner end of the first roller tooth. The connecting shaft slides with the clamping plate through the limiting groove. Rollers are rotatably mounted on both ends of the connecting shaft. The end plate is fixedly mounted on the mixing box. A rolling groove is formed on the side of the end plate facing the sleeve. The distance between the rolling groove between the first roller shaft and the side wall of the mixing box and the axis of the first roller shaft is less than the distance between the rolling groove on the side of the first roller shaft away from the side wall of the mixing box and the axis of the first roller shaft. The roller slides along the rolling groove. The two ends of the first roller shaft pass through the corresponding end plates and are rotatably engaged with the end plates. The extending direction of the limiting groove intersects the radial direction of the sleeve; It also includes a purging assembly, which includes a blower and an air collecting hood. An air chamber is formed inside the first roller shaft, and a blowing hole is formed on the part of the first roller shaft located inside the sleeve. The blowing hole is located between adjacent plates. The output end of the blower is connected to the air collecting hood. The air collecting hood is installed on the outside of the mixing box, and the air chamber is connected to the air collecting hood. An air outlet is formed at the end of the first roller shaft away from the air collecting hood. The radial cross-sectional area of ​​the air outlet is smaller than the radial cross-sectional area of ​​the air chamber. The second extrusion roller includes a second roller shaft and second roller teeth. The second roller shaft is rotatably mounted on the mixing box. Multiple second roller teeth are fixedly arranged on the second roller shaft. The second roller teeth and the first roller teeth are alternately distributed. A cavity is opened inside the second roller shaft. A rotary connector is installed at one end of the second roller shaft to supply coolant into the cavity. The other end of the second roller shaft is connected to a drain pipe.

2. The triaxial mixing device for producing fertilizer containing trace elements according to claim 1, characterized in that, The extrusion drive assembly includes an extrusion drive component and meshing gears. The input ends of the two first roller shafts are fixedly connected to meshing gears, and the two meshing gears mesh with each other. The output end of the extrusion drive component is drivenly connected to one of the first roller shafts.

3. The triaxial mixing device for producing fertilizer containing trace elements according to claim 1, characterized in that, A sealing cap is fixedly installed on the side of the end plate away from the sleeve. An oil injection pipe is installed on the sealing cap and is connected to the groove to inject lubricating oil into the groove.

4. The triaxial mixing device for producing fertilizer containing trace elements according to claim 1, characterized in that, A feeding hopper is provided on one side of the feeding box, and the feeding hopper is connected to the feeding box through a discharge port opened on the side of the feeding box; A crankshaft is rotatably installed inside the feed box. A pressure drive is connected to the input end of the crankshaft. A cam is fixedly connected to the end of the crankshaft away from the pressure drive. A connecting rod is rotatably connected to the crank part of the crankshaft. A pressure plate is rotatably installed at the other end of the connecting rod. The pressure plate is located below the crankshaft and slides against the side wall of the feed box. A baffle is fixedly provided on the edge of the pressure plate. When the pressure plate moves down to its maximum displacement, the discharge port is closed due to the sealing of the baffle.

5. A triaxial mixing device for producing fertilizer containing trace elements according to claim 4, characterized in that, The feeding hopper includes an inclined feeding channel, and a scraper conveyor is provided in the feeding channel to scrape the granular raw materials in the feeding channel toward the discharge port.

6. A method for using the triaxial mixing apparatus for producing fertilizer containing trace elements as described in claim 1, characterized in that, Includes the following steps: The premixed granular raw materials are fed into the mixing box through the feed box; The granular raw material is graded and extruded by the interlocking of two first extrusion rollers and the interlocking of the first extrusion roller and the second extrusion roller. The sleeve of the first extrusion roller is in contact with the side wall of the mixing box. When the first roller tooth rotates to the position of the side wall of the mixing box, the first roller tooth is driven to slide towards the inside of the sleeve by the shrinking component, so that the outer end face of the first roller tooth is located on the inner side of the outer surface of the sleeve. The extruded raw materials are thoroughly mixed using a stirring assembly.

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