A granulation device and granulation method for compound fertilizer production

Abstract

The present invention relates to the technical field of granulation devices, and specifically discloses a granulation device for compound fertilizer production and a granulation method thereof, comprising: a box body, a feed chamber provided in the box body, a primary extrusion module and a secondary extrusion module provided in the box body; the primary extrusion module comprises a first granulation roller and a second granulation roller which rotate horizontally at the discharge port of the feed chamber, the second granulation roller and the first granulation roller are arranged up and down, and there is a gap between the two for material to pass through so as to extrude the material into a material belt, and the first granulation roller and the second granulation roller are both provided with a forming groove. The beneficial effects of the present invention are as follows: after two extrusions, the finished granules are made more compact, and when the forming grooves of the first granulation roller and the third granulation roller are matched, the finished granules are separated from the mesh waste belt, and there is no burr around the finished granules, and no crushing process is required, which effectively improves the quality of the finished granules.

Description

Technical Field

[0001] The invention relates to the technical field of granulation devices, in particular to a granulation device for compound fertilizer production and a granulation method thereof. Background Art

[0002] The double-roll extrusion granulator uses twin rollers to process powdered materials into granular products. Its operating principle is as follows: Material is fed through a feed port and squeezed between two counter-rotating rollers. Pressure and shear forces agglomerate the material into dense granules, which are then crushed and screened to produce the finished product. This equipment utilizes ambient temperature granulation technology, eliminating the need for drying and streamlining the production process.

[0003] Application document with publication number CN112156721A discloses a double-roller granulator comprising a first roller, a second roller, and a power mechanism. The first roller comprises a first cylinder fixed to and rotatable about a first rotating shaft. The outer surface of the first cylinder is provided with a plurality of first grooves. A first elastic layer is adhered to and covers the outer surface of the first cylinder. A first pressing layer is adhered to and covers the outer surface of the first elastic layer. The outer surface of the first pressing layer comprises a plurality of first through-holes. When the first elastic layer is pressed until it contacts the surface of the first grooves, the first through-holes communicate with the first grooves to form a first half-cavity. The second roller comprises a second rotating shaft parallel to the first rotating shaft. The power mechanism is configured to drive the first and second rollers to rotate, thereby connecting the first half-cavity with the second half-cavity to form a granulation cavity. The double-roller granulator disclosed in this document is capable of effectively forming and discharging materials with relatively low dryness, achieving excellent processing results.

[0004] Common fertilizer granulation mostly uses a double-roll extrusion granulator. During the granulation process, the granulation mechanism of the granulator will cause a large number of irregular burrs on the edge of the material. These burrs will adhere to the finished granules to form a flaky structure. Ultimately, they need to rely on crushing and screening devices for secondary processing to achieve effective separation. This method not only produces a large number of burrs on the finished granules, but also easily causes the finished granules to break during crushing, affecting the quality and efficiency of granulation. Summary of the Invention

[0005] The present invention provides a granulation device and a granulation method for compound fertilizer production, aiming to solve the technical problem in the related art that a large number of irregular burrs are generated on the edge of the material during the granulation process of the granulator. These burrs will adhere to the finished particles to form a flaky structure, and ultimately rely on crushing and screening devices for secondary processing to achieve effective separation. This method not only causes a large number of burrs to be generated on the finished particles, but also easily causes the finished particles to break during crushing, thereby affecting the quality and efficiency of granulation.

[0006] The present invention provides a granulating device for producing compound fertilizer, comprising: a box body, a feed chamber provided in the box body, a primary extrusion module and a secondary extrusion module provided in the box body; the primary extrusion module comprises a first granulating roller and a second granulating roller which rotate horizontally at the discharge port of the feed chamber, the second granulating roller and the first granulating roller are arranged up and down, and there is a gap between the two for the material to pass through so as to extrude the material into a material strip, the first granulating roller and the second granulating roller are both provided with a forming groove, and when the two rotate, the forming grooves correspond one to one, and the forming groove on the first granulating roller is larger than the forming groove on the second granulating roller; the secondary extrusion module comprises a first granulating roller which rotates in the box body and is arranged horizontally with the first granulating roller The granulating roller abuts the third granulating roller, and the axis of the third granulating roller and the first granulating roller are arranged horizontally left and right. The third granulating roller is also provided with a forming groove, and the same size as the forming groove on the first granulating roller and one-to-one corresponding, a horizontal pit is provided between two adjacent forming grooves in the circumferential direction of the third granulating roller, and a circumferential pit perpendicular to the horizontal pit and connected with the horizontal pit is provided between two adjacent forming grooves along its axial direction. The inner side of the third granulating roller has a negative pressure cavity close to the side of the first granulating roller and a positive pressure cavity away from the side of the first granulating roller, and an air hole is provided in the horizontal pit. As the third granulating roller rotates, the air hole can be connected with the negative pressure cavity or the positive pressure cavity.

[0007] Beneficial Effects: The material is squeezed into a material belt through the gap between the first and second granulating rollers. The semi-finished particles formed by the forming grooves on the first and second granulating rollers are placed on both sides of the material belt. The material belt then reaches between the first and third granulating rollers. The smaller semi-finished particles on the material belt enter the forming grooves on the third granulating roller. As the forming grooves of the first and third granulating rollers align, the forming grooves on the third granulating roller press the smaller semi-finished particles and the material belt into the forming grooves on the first granulating roller, thereby forming complete finished particles. As the first and third granulating rollers rotate, the finished particles fall, and the excess waste enters the circumferential and horizontal pits to form a net-like waste belt. The third granulating roller can squeeze the semi-finished material again. After two squeezes, the finished particles are more compact. Moreover, when the forming grooves of the first and third granulating rollers align, the finished particles are separated from the net-like waste belt. There is no burr around the edges of the finished particles, and no further crushing is required, effectively improving the quality of the finished particles.

[0008] Preferably, the interior of the third granulation roller is a hollow structure, and a fixed shaft is installed inside the third granulation roller for sealing and rotation. The fixed shaft is fixedly connected to the box body, and an upper protrusion and a lower protrusion are provided on the fixed shaft. The negative pressure chamber and the positive pressure chamber are respectively arranged on both sides of the upper protrusion, and the negative pressure chamber and the positive pressure chamber are both connected to an air supply part.

[0009] The effect is that a negative pressure chamber and a positive pressure chamber are formed inside the third granulating roller, and when the mesh waste belt rotates to the left, it is separated from the third granulating roller.

[0010] Preferably, a crushing shaft is rotatably installed in the box body, the crushing shaft rotates around an axis extending in the front-to-back direction, and the crushing shaft is located on a side of the third granulating roller away from the first granulating roller.

[0011] The effect is that the mesh waste belt can be crushed to facilitate its recycling and reuse.

[0012] Preferably, a blowing pipe is fixedly installed in the box body, the blowing pipe is located below the third granulating roller, and the blowing pipe is parallel to the axis of the third granulating roller. An air pump is connected to the blowing pipe, and a plurality of spray holes are arranged on the blowing pipe along its axial direction, and the spray holes face the bottom of the third granulating roller.

[0013] The effect thereof is that the finished product particles may be attached to the third granulating roller, and the spray holes can blow off the finished product particles attached to the third granulating roller.

[0014] Preferably, a tamping frame is provided in the box body, and the front and rear side walls of the box body are provided with long strip avoidance perforations running through the front and rear. The front and rear ends of the tamping frame are respectively inserted into the avoidance perforations and slideably cooperate with the avoidance perforations. A spring is also provided on the tamping frame, one end of the spring is connected to the tamping frame, and the other end is connected to the box body. A control arm fixedly connected to the tamping frame is provided on the front side of the box body, and the control arm has a pushing part. The rotating shaft of the second granulating roller extends to the front side of the box body, and a cam is fixedly mounted on the rotating shaft. The cam abuts against the pushing part of the control arm to push the control arm and the tamping frame to reciprocate, and the tamping frame is oriented toward the gap between the first granulating roller and the second granulating roller.

[0015] The effect is that the pounding frame can continuously pound the material between the first granulating roller and the second granulating roller, so that the material entering between the first granulating roller and the second granulating roller is more compact.

[0016] Preferably, the cross-sections of the circumferential pits and the horizontal pits are both V-shaped.

[0017] Preferably, a driving motor is fixedly installed inside the box body, a driving gear connected to the driving motor is rotatably installed on the rear side of the box body, a first transmission gear meshing with the driving gear is rotatably installed on the rear side of the box body, a second transmission gear fixedly connected to the first granulation roller is rotatably installed on the rear side of the box body, the second transmission gear is meshed with the first transmission gear, and a third transmission gear fixedly connected to the second granulation roller is also rotatably installed on the rear side of the box body, and the second transmission gear is meshed with the third transmission gear.

[0018] Preferably, the first granulation roller and the third granulation roller are respectively provided with a first driving wheel and a second driving wheel, and the first driving wheel and the second driving wheel are connected by a transmission belt, and the box body is provided with a tensioning wheel that cooperates with the transmission belt.

[0019] Preferably, an obliquely arranged blanking plate is provided at the bottom of the box, and filter holes are provided on the blanking plate.

[0020] Preferably, a granulation method for compound fertilizer production, using the above-mentioned granulation device, comprises the following steps:

[0021] Step 1: Add the material into the feeding cavity of the box;

[0022] In step 2, the material passes between the first granulating roller and the second granulating roller. The gap between the first granulating roller and the second granulating roller squeezes the material into a material belt. The semi-finished particles formed by the forming grooves on the first granulating roller and the second granulating roller are respectively on both sides of the material belt, and the volume of the semi-finished particles on the first granulating roller is larger than that on the second granulating roller.

[0023] Step 3: The extruded material enters between the first granulation roller and the third granulation roller. The forming groove on the third granulation roller squeezes the material toward the forming groove on the first granulation roller, thereby forming finished granules. The waste material will be squeezed into the circumferential pits and horizontal pits to form a mesh waste belt.

[0024] In step 4, the finished particles fall onto the drop plate below. As the third granulation roller rotates, when the mesh waste belt is on the right side, the air holes are connected to the negative pressure chamber to absorb the mesh waste belt. When the mesh waste belt is on the left side, the air holes are connected to the positive pressure chamber to blow the mesh waste belt off.

[0025] By adopting the above technical solution, the beneficial effects of the present invention are as follows: the material will be squeezed into a material belt through the gap between the first granulating roller and the second granulating roller, and the semi-finished particles formed by the forming grooves on the first granulating roller and the second granulating roller will be respectively on both sides of the material belt, and then the material belt reaches between the first granulating roller and the third granulating roller, and the smaller semi-finished particles on the material belt will enter the forming groove on the third granulating roller, and as the forming grooves of the first granulating roller and the third granulating roller coincide, the forming groove on the third granulating roller presses the smaller semi-finished particles and the material belt onto the first granulating roller The forming groove of the first granulating roller and the third granulating roller are matched, thereby forming complete finished particles. As the first granulating roller and the third granulating roller rotate, the finished particles fall down, and the excess waste enters the circumferential pits and the horizontal pits to form a mesh waste belt. The third granulating roller can squeeze the semi-finished material again. After two squeezes, the finished particles are more compact. When the forming grooves of the first granulating roller and the third granulating roller are matched, the finished particles are separated from the mesh waste belt, and there is no burr around the finished particles, so no crushing is required, which effectively improves the quality of the finished particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 It is a cross-sectional view of the present invention.

[0028] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle.

[0029] Figure 4 It is a schematic diagram of the internal structure of the present invention.

[0030] Figure 5 Schematic diagram of the structure of the second driving wheel of the present invention.

[0031] Figure 6 Schematic diagram of the structure of the second transmission gear of the present invention.

[0032] Figure 7 It is a structural schematic diagram of the first granulation roller of the present invention.

[0033] Figure 8 It is a structural schematic diagram of the third granulating roller of the present invention.

[0034] Figure 9 For the present invention Figure 8 Enlarged view of point B in the middle.

[0035] Figure 10 This is a cross-sectional view of the third granulating roller of the present invention.

[0036] Figure 11 It is a structural schematic diagram of the fixed shaft of the present invention.

[0037] Figure 12 It is a schematic diagram of the material of the present invention being extruded into a material strip shape.

[0038] Reference numerals:

[0039] 10. Box; 11. Feeding hopper; 12. Base; 13. Side panel; 14. Bottom panel; 15. Protective plate; 16. Blanking plate; 20. First granulation roller; 21. Second granulation roller; 22. Forming trough; 23. Drive motor; 24. Driving gear; 25. First transmission gear; 26. Second transmission gear; 27. Third transmission gear; 30. Ramming frame; 31. Control arm; 32. Cam; 40. Third granulation roller Roller; 41. Horizontal pit; 42. Circumferential pit; 43. First driving wheel; 44. Second driving wheel; 45. Transmission belt; 46. Tensioning wheel; 50. Fixed shaft; 51. Upper raised portion; 52. Lower raised portion; 53. Negative pressure chamber; 54. Positive pressure chamber; 55. Air pipe; 56. Air hole; 60. Blowing tube; 61. Spray hole; 70. Partition; 71. Crushing shaft; 72. Third driving wheel; 73. Fourth driving wheel. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0041] like Figures 1 to 12 As shown, a specific embodiment of a granulation device for compound fertilizer production of the present invention includes a carrying module, a primary extrusion module, a secondary extrusion module and a waste crushing module.

[0042] like Figure 1 and Figure 2 As shown, the carrying module includes a box body 10 , a feeding hopper 11 , a base 12 , side panels 13 , a bottom panel 14 , a protective panel 15 and a blanking panel 16 .

[0043] The box body 10 is a square structure. A base 12 is provided at the bottom of the box body 10 , and a hopper 11 is provided on the upper surface of the box body 10 and is communicated with the inner side thereof.

[0044] The inside of the box body 10 is provided with vertically arranged side panels 13 and an inclined bottom panel 14. The front and rear ends of the side panels 13 and bottom panel 14 are respectively fixedly connected to the front and rear inner walls of the box body 10. A feed cavity is formed between the side panels 13 and bottom panel 14. The upper part of the feed cavity is connected to the hopper 11, and the lower part of the feed cavity has an opening.

[0045] Protective plates 15 are detachably mounted on both the front and rear sides of the box body 10 by bolts, and the protective plates 15 are U-shaped structures. The protective plates 15 are used to protect the transmission structures on the front and rear sides of the device.

[0046] The bottom of the box 10 is open, and the base 12 is equipped with an inclined drop plate 16. After being processed by the primary and secondary extrusion modules within the box 10, the finished particles fall onto the drop plate 16 and are discharged outside the device. The drop plate 16 is covered with filter holes, the size of which can be adjusted according to the size of the particles to be produced. The filter holes can filter out debris particles in the finished particles to ensure production quality.

[0047] like Figure 2 、 Figure 4 、 Figure 6 and Figure 7 As shown, the primary extrusion module includes a first granulation roller 20, a second granulation roller 21, a driving unit and a pounding unit.

[0048] The first granulating roller 20 and the second granulating roller 21 are rotatably installed at the opening below the feed chamber. The axes of the first granulating roller 20 and the second granulating roller 21 extend in the front-to-back direction. The first granulating roller 20 and the second granulating roller 21 are arranged at intervals up and down, and there is a gap between the two for the material to pass through. The diameters of the first granulating roller 20 and the second granulating roller 21 are the same.

[0049] like Figure 7 As shown, the first granulation roller 20 and the second granulation roller 21 are both uniformly provided with forming grooves 22. That is, the first granulation roller 20 and the second granulation roller 21 are both provided with multiple rows of forming grooves 22 along their circumferences, and the multiple forming grooves 22 in each row are arranged along their axial directions. The forming grooves 22 on the first granulation roller 20 and the second granulation roller 21 are arranged in a one-to-one correspondence.

[0050] It is particularly emphasized that the cross-section of the forming groove 22 on the first granulating roller 20 is a semicircular structure, that is, the forming groove 22 on the first granulating roller 20 is a hemispherical structure. The volume of the forming groove 22 on the second granulating roller 21 is smaller than the volume of the forming groove 22 on the first granulating roller 20. The two corresponding forming grooves 22 on the first granulating roller 20 and the second granulating roller 21 are coaxially arranged.

[0051] The driving unit includes a driving motor 23 , a driving gear 24 , a first transmission gear 25 , a second transmission gear 26 and a third transmission gear 27 .

[0052] A driving motor 23 is fixedly installed on the inside of the box body 10, and a driving gear 24 connected to the driving motor 23 is rotatably installed on the rear side of the box body 10. A first transmission gear 25 meshing with the driving gear 24 is also rotatably installed on the rear side of the box body 10, so that the driving motor 23 can drive the first transmission gear 25 to rotate through the driving gear 24.

[0053] A second transmission gear 26, fixedly connected to the first granulating roller 20, is rotatably mounted on the rear side of the housing 10. A third transmission gear 27, fixedly connected to the second granulating roller 21, is also rotatably mounted on the rear side of the housing 10. The second transmission gear 26 and the third transmission gear 27 mesh with each other and have the same diameter. The first transmission gear 25 meshes with the second transmission gear 26, enabling the first transmission gear 25 to drive the second transmission gear 26 and the third transmission gear 27 to rotate, thereby rotating the first granulating roller 20 and the second granulating roller 21, thereby performing preliminary extrusion and granulation on the material.

[0054] When the material passes between the first granulation roller 20 and the second granulation roller 21, it will be squeezed into Figure 12 The shape shown, that is, the gap between the first granulation roller 20 and the second granulation roller 21 will squeeze the material into a material belt, and the semi-finished particles formed by the forming grooves 22 on the first granulation roller 20 and the second granulation roller 21 will be on both sides of the material belt. Since the volume of the semi-finished particles on the first granulation roller 20 is larger than that on the second granulation roller 21, as the first granulation roller 20 and the second granulation roller 21 rotate, the semi-finished particles on the second granulation roller 21 are more likely to fall off. Finally, the material belt and the semi-finished particles on both sides will be wrapped around the outside of the first granulation roller 20 and rotate, and then enter the secondary extrusion module for extrusion and granulation.

[0055] It is particularly important to note that the distance between the highest point of the curved edge of the semi-finished granules on the second granulating roller 21 and the material belt plus the thickness of the material belt is greater than the radius of the semi-finished granules on the first granulating roller 20. In other words, during extrusion by the secondary extrusion module, the volume of the semi-finished granules on the second granulating roller 21 plus the volume of the intermediate material belt after extrusion can be greater than the volume of the semi-finished granules on the second granulating roller 21. This allows the finished granules to be extruded more compactly, avoiding defects in the finished granules due to insufficient material.

[0056] Since there is a gap between the first granulating roller 20 and the second granulating roller 21 , a tamping unit is provided to compact the material entering between the two rollers and to ensure that the two rollers can squeeze the material into the shape of a material strip.

[0057] like Figure 4 As shown, the tamping unit includes a tamping frame 30 , a control arm 31 and a cam 32 .

[0058] A ramming frame 30 is provided in the box body 10. The ramming frame 30 is a plate-like structure composed of multiple ramming strips. The front and rear side walls of the box body 10 are provided with long strip avoidance holes running through the front and rear. The front and rear ends of the ramming frame 30 are respectively inserted into the avoidance holes and slide in conjunction with the avoidance holes. A spring is also provided on the ramming frame 30. One end of the spring is connected to the ramming frame 30, and the other end is connected to the inside of the box body 10. The front side of the box body 10 is provided with a control arm 31 fixedly connected to the tamping frame 30, and the control arm 31 has a pushing portion. The rotating shaft of the second granulating roller 21 extends to the front side of the box body 10, and a cam 32 is fixedly installed on the rotating shaft. The cam 32 abuts against the pushing portion of the control arm 31, so that when the second granulating roller 21 rotates, it can continuously push the control arm 31 to reciprocate. The control arm 31 drives the tamping frame 30 to continuously slide back and forth, and the tamping frame 30 is directed towards the gap between the first granulating roller 20 and the second granulating roller 21, that is, the tamping frame 30 can continuously pound the material between the first granulating roller 20 and the second granulating roller 21, so that the material entering between the first granulating roller 20 and the second granulating roller 21 is more compact.

[0059] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 As shown, the secondary extrusion module includes a secondary extrusion unit, a suction unit and a blowing unit.

[0060] The secondary extrusion unit includes a third granulating roller 40 , a horizontal pit 41 , a circumferential pit 42 , a first driving wheel 43 , a second driving wheel 44 , a transmission belt 45 and a tensioning wheel 46 .

[0061] The third granulating roller 40 is rotatably mounted on the left side of the first granulating roller 20 . The axis of the third granulating roller 40 extends horizontally in the front-to-back direction, and the interior of the third granulating roller 40 is a hollow structure.

[0062] In this embodiment, the diameter of the third granulating roller 40 is smaller than that of the first granulating roller 20, and the plane formed by the axes of the third granulating roller 40 and the first granulating roller 20 is horizontal. The third granulating roller 40 is covered with forming grooves 22 of exactly the same size as those on the first granulating roller 20. The third granulating roller 40 and the first granulating roller 20 abut each other, and the linear speed of the meshing point of the third granulating roller 40 and the first granulating roller 20 is consistent. Therefore, when the forming grooves 22 on the two reach the abutment point during rotation, the forming grooves 22 are aligned one-to-one, thereby completely squeezing the material into granules.

[0063] A first drive wheel 43 connected to the first granulation roller 20 is rotatably mounted on the front side of the housing 10. The rotating shaft of the third granulation roller 40 extends to the front side of the housing 10. The rotating shaft of the third granulation roller 40 is also open at both ends and communicates with the interior of the third granulation roller 40. A second drive wheel 44 is fixedly mounted on the portion of the rotating shaft of the third granulation roller 40 located on the front side of the housing 10. The first drive wheel 43 and the second drive wheel 44 are connected by a transmission belt 45. When the first granulation roller 20 rotates, the first drive wheel 43 and the second drive wheel 44 can drive the third granulation roller 40 to rotate. It is particularly important to emphasize that the size ratio of the first granulation roller 20 to the third granulation roller 40 is the same as the size ratio of the first drive wheel 43 to the second drive wheel 44.

[0064] Tensioning pulleys 46 are mounted at the upper and lower front sides of the housing 10. These tensioning pulleys 46 respectively tension the upper and lower portions of the transmission belt 45. These tensioning pulleys 46 can be adjusted up and down to adjust the tension of the transmission belt 45 as needed, ensuring the rotational accuracy of the first and third granulating rollers 20 and 40. The tensioning pulleys 46 and their specific adjustment mechanisms are known in the art and will not be described in detail here.

[0065] In this embodiment, the first drive wheel 43, the second drive wheel 44, and the transmission belt 45 are chain-driven, that is, the first drive wheel 43 and the second drive wheel 44 are gear structures, and the transmission belt 45 is a chain structure. In other embodiments, the first drive wheel 43 and the second drive wheel 44 can also be synchronous pulleys, and the transmission belt 45 can be a synchronous belt, which can still achieve transmission to the third granulating roller 40.

[0066] like Figure 8 and Figure 9As shown, among the multiple rows of forming grooves 22 arranged along the circumference of the third granulating roller 40, horizontal pits 41 that pass through horizontally from front to back are provided between two adjacent rows of forming grooves 22. The horizontal pits 41 are parallel to the axis of the third granulating roller 40, and the cross-section of the horizontal pits 41 is V-shaped.

[0067] Between adjacent forming grooves 22 along the axial direction of the third granulating roller 40, a circumferential recess 42 is formed, perpendicular to the horizontal recess 41. Each circumferential recess 42 is connected to the horizontal recess 41 and has a V-shaped cross-section. The circumferential recesses 42 and the horizontal recesses 41 form a network structure within the third granulating roller 40, enclosing the forming grooves 22 in individual small units within the roller. Each forming groove 22 is formed as a quadrangular pyramid. The axis of the forming groove 22 coincides with the axis of the quadrangular pyramid.

[0068] When the primary extrusion module is extruded into Figure 12 When the material of the shape shown reaches between the first and third granulating rollers 20, 40, the smaller semi-finished particles on the material belt enter the forming groove 22 on the third granulating roller 40. As the forming grooves 22 of the first and third granulating rollers 20 and 40 align, the forming grooves 22 on the third granulating roller 40 press the smaller semi-finished particles and the material belt toward the forming grooves 22 of the first granulating roller 20, thereby forming complete finished particles. When the forming grooves 22 of the first and third granulating rollers 20 and 40 align, they can squeeze the semi-finished material again, making the finished particles more compact and improving the hardness of the finished product. Because the material belt is thick, the excess part will enter the surrounding circumferential pits 42 and horizontal pits 41, forming a mesh-like waste belt.

[0069] As the first granulation roller 20 and the third granulation roller 40 rotate, the finished granules rotate to the bottom and fall onto the blanking plate 16 for discharge, and the mesh waste belt will be adsorbed on the third granulation roller 40 by the suction unit. When the mesh waste rotates to the left, the suction unit will blow the mesh waste away from the third granulation roller 40.

[0070] like Figure 3 、 Figure 10 and Figure 11 As shown, the suction unit includes a fixed shaft 50 , an upper protrusion 51 , a lower protrusion 52 and an air pipe 55 .

[0071] The fixed shaft 50 is sealed and rotatably mounted within the third granulating roller 40, and is coaxially arranged with the third granulating roller 40. Air pipes 55 are fixedly mounted on both the front and rear ends of the fixed shaft 50. The front and rear air pipes 55 pass through the rotating shaft of the third granulating roller 40 and are respectively fixedly mounted on the front and rear protective plates 15. The front and rear air pipes 55 are both connected to air pumps. The air pump on the front air pipe 55 is used for suction, while the air pump on the rear air pipe 55 is used for blowing.

[0072] The fixed shaft 50 is provided with an upper protrusion 51 at the upper right position, and a lower protrusion 52 at the lower left position. The upper protrusion 51 and the lower protrusion 52 are both sealed and slidably engaged with the inner wall of the third granulating roller 40. The upper protrusion 51 and the lower protrusion 52 divide the interior of the third granulating roller 40 into a negative pressure chamber 53 and a positive pressure chamber 54 (such as Figure 3 ), that is, the negative pressure chamber 53 is located on the side close to the first granulating roller 20, and the positive pressure chamber 54 is located on the side away from the first granulating roller 20. The negative pressure chamber 53 is connected to the air pipe 55 on the front side, and the positive pressure chamber 54 is connected to the air pipe 55 on the rear side.

[0073] A plurality of air holes 56 connected to the inner cavity of the third granulation roller 40 are arranged at intervals at the bottom of the horizontal pits 41. As the third granulation roller 40 rotates, the air holes 56 are connected to the negative pressure chamber 53, so that the mesh waste belt can be adsorbed on the third granulation roller 40. When the mesh waste belt rotates to the left with the third granulation roller 40, the air holes 56 are connected to the positive pressure chamber 54, thereby blowing the mesh waste belt away from the third granulation roller 40, and the mesh waste belt will fall into the waste crushing module for crushing.

[0074] The blowing unit includes a blowing pipe 60 fixedly mounted within the housing 10. The blowing pipe 60 is located to the lower left of the third granulating roller 40 and is parallel to the axis of the third granulating roller 40. An air pump is connected to the blowing pipe 60, and a plurality of spray holes 61 are provided along the axial direction of the blowing pipe 60. The spray holes 61 face the bottom of the third granulating roller 40. The finished particles may be attached to the third granulating roller 40, and the spray holes 61 can blow off the finished particles attached to the third granulating roller 40.

[0075] like Figure 2 and Figure 6 As shown, the pulverizing module includes a partition 70 and a pulverizing shaft 71 .

[0076] A partition 70 is provided within the housing 10 and is positioned to the lower left of the third granulating roller 40. A crushing shaft 71 is rotatably mounted on the left side of the partition 70, with the axis of the crushing shaft 71 extending in the front-to-back direction. Net-like waste material blown off the third granulating roller 40 falls onto the crushing shaft 71, where it is crushed and then falls. The crushed waste material can then be recycled.

[0077] The rotating shaft on the rear side of the third granulating roller 40 extends to the rear side of the box body 10, and a third driving wheel 72 is fixedly installed on the rotating shaft. A fourth driving wheel 73 connected to the crushing shaft 71 is rotatably installed on the rear side of the box body 10, and the third driving wheel 72 and the fourth driving wheel 73 are connected by a belt, so that the third granulating roller 40 can drive the crushing shaft 71 to rotate.

[0078] According to the granulation device for compound fertilizer production according to the embodiment of the present invention, the granulation method thereof comprises the following steps:

[0079] Step 1: Add the material into the feeding chamber in the box body 10 through the feeding hopper 11;

[0080] In step 2, the material passes between the first granulating roller 20 and the second granulating roller 21. The gap between the first granulating roller 20 and the second granulating roller 21 squeezes the material into a material belt. The semi-finished particles formed by the forming grooves 22 on the first granulating roller 20 and the second granulating roller 21 are respectively located on both sides of the material belt, and the volume of the semi-finished particles on the first granulating roller 20 is larger than that on the second granulating roller 21.

[0081] Step 3: The extruded material enters between the first granulation roller 20 and the third granulation roller 40. The forming groove 22 on the third granulation roller 40 squeezes the material toward the forming groove 22 on the first granulation roller 20, thereby forming finished granules. The waste material will be squeezed into the circumferential pit 42 and the horizontal pit 41 to form a mesh waste belt;

[0082] In step 4, the finished particles fall onto the blanking plate 16 below. As the third granulating roller 40 rotates, when the mesh waste belt is on the right side, the air hole 56 communicates with the negative pressure chamber 53 to absorb the mesh waste belt. When the mesh waste belt is on the left side, the air hole 56 communicates with the positive pressure chamber 54 to blow the mesh waste belt off.

[0083] Step 5: The mesh waste belt falls onto the crushing shaft 71 for crushing and recycling.

[0084] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A granulating device for compound fertilizer production, comprising: The box body has a feeding cavity, and is characterized in that the box body is also provided with a primary extrusion module and a secondary extrusion module; The primary extrusion module includes a first granulation roller and a second granulation roller that rotate horizontally at the discharge port of the feed chamber. The second granulation roller is arranged above the first granulation roller, and there is a gap between the two for the material to pass through to extrude the material into a material strip. The first granulation roller and the second granulation roller are both provided with forming grooves, and when the two rotate, the forming grooves correspond one to one, and the forming groove on the first granulation roller is larger than the forming groove on the second granulation roller; The secondary extrusion module includes a third granulating roller that rotates in the box and abuts against the first granulating roller. The third granulating roller and the axis of the first granulating roller are arranged horizontally left and right. The third granulating roller is also provided with a forming groove, which is the same size as the forming groove on the first granulating roller and corresponds one to one. A horizontal pit that passes through horizontally from front to back is provided between two adjacent forming grooves in the circumferential direction of the third granulating roller. A circumferential pit that is perpendicular to the horizontal pit and connected to the horizontal pit is provided between two adjacent forming grooves along its axial direction. The inner side of the third granulating roller has a negative pressure cavity close to the side of the first granulating roller and a positive pressure cavity away from the side of the first granulating roller. An air hole is provided in the horizontal pit. As the third granulating roller rotates, the air hole can be connected with the negative pressure cavity or the positive pressure cavity.

2. A granulating device for compound fertilizer production according to claim 1, characterized in that: The interior of the third granulation roller is a hollow structure, and a fixed shaft is installed inside the third granulation roller in a sealed and rotatable manner. The fixed shaft is fixedly connected to the box body, and an upper protrusion and a lower protrusion are provided on the fixed shaft. The negative pressure chamber and the positive pressure chamber are respectively arranged on both sides of the upper protrusion, and the negative pressure chamber and the positive pressure chamber are both connected to an air supply component.

3. A granulating device for compound fertilizer production according to claim 1, characterized in that: A crushing shaft is rotatably mounted in the box body. The crushing shaft rotates around an axis extending in the front-rear direction. The crushing shaft is located on a side of the third granulating roller away from the first granulating roller.

4. A granulating device for compound fertilizer production according to claim 1, characterized in that: A blowing pipe is fixedly installed in the box body, the blowing pipe is located below the third granulating roller, and the blowing pipe is parallel to the axis of the third granulating roller. The blowing pipe is connected to an air pump, and a plurality of spray holes are arranged on the blowing pipe along its axial direction, and the spray holes face the bottom of the third granulating roller.

5. A granulating device for compound fertilizer production according to claim 1, characterized in that: A tamping frame is provided in the box body, and the front and rear side walls of the box body are provided with long strip avoidance through-holes running through the front and rear. The front and rear ends of the tamping frame are respectively inserted into the avoidance through-holes and slideably cooperate with the avoidance through-holes. A spring is also provided on the tamping frame, one end of the spring is connected to the tamping frame, and the other end is connected to the box body. A control arm fixedly connected to the tamping frame is provided on the front side of the box body, and the control arm has a pushing portion. The rotating shaft of the second granulating roller extends to the front side of the box body, and a cam is fixedly mounted on the rotating shaft. The cam abuts against the pushing portion of the control arm to push the control arm and the tamping frame to reciprocate, and the tamping frame is oriented toward the gap between the first granulating roller and the second granulating roller.

6. A granulating device for compound fertilizer production according to any one of claims 1 to 5, characterized in that: The cross sections of the circumferential pit and the horizontal pit are both V-shaped.

7. A granulating device for compound fertilizer production according to claim 6, characterized in that: A driving motor is fixedly installed inside the box body, a driving gear connected to the driving motor is rotatably installed on the rear side of the box body, a first transmission gear meshing with the driving gear is rotatably installed on the rear side of the box body, a second transmission gear fixedly connected to the first granulation roller is rotatably installed on the rear side of the box body, the second transmission gear is meshed with the first transmission gear, and a third transmission gear fixedly connected to the second granulation roller is also rotatably installed on the rear side of the box body, and the second transmission gear is meshed with the third transmission gear.

8. A granulating device for compound fertilizer production according to claim 7, characterized in that: The first granulation roller and the third granulation roller are respectively provided with a first driving wheel and a second driving wheel, and the first driving wheel and the second driving wheel are connected by a transmission belt, and the box body is provided with a tensioning wheel matched with the transmission belt.

9. A granulating device for compound fertilizer production according to claim 8, characterized in that: The bottom of the box body is provided with an inclined blanking plate, and the blanking plate is provided with filter holes.

10. A granulation method for compound fertilizer production, characterized in that: The granulation device according to claim 1 comprises the following steps: Step 1: Add the material into the feeding cavity of the box; In step 2, the material passes between the first granulating roller and the second granulating roller. The gap between the first granulating roller and the second granulating roller squeezes the material into a material belt. The semi-finished particles formed by the forming grooves on the first granulating roller and the second granulating roller are respectively on both sides of the material belt, and the volume of the semi-finished particles on the first granulating roller is larger than that on the second granulating roller. Step 3: The extruded material enters between the first granulation roller and the third granulation roller. The forming groove on the third granulation roller squeezes the material toward the forming groove on the first granulation roller, thereby forming finished granules. The waste material will be squeezed into the circumferential pits and horizontal pits to form a mesh waste belt. In step 4, the finished particles fall onto the drop plate below. As the third granulation roller rotates, when the mesh waste belt is on the right side, the air holes are connected to the negative pressure chamber to absorb the mesh waste belt. When the mesh waste belt is on the left side, the air holes are connected to the positive pressure chamber to blow the mesh waste belt off.

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