Granulation device for compound fertilizer production and granulation method thereof

Abstract

The invention relates to the technical field of granulation devices, and particularly discloses a granulation device for compound fertilizer production and a granulation method thereof.The granulation device comprises a box body, the box body is internally provided with a feeding cavity, and the box body is further internally provided with a primary extrusion module and a secondary extrusion module; the primary extrusion module comprises a first granulation roller and a second granulation roller which horizontally rotate at a discharge port of the feeding cavity, the second granulation roller and the first granulation roller are arranged up and down, a gap for materials to penetrate through so as to extrude the materials into a material belt is formed between the second granulation roller and the first granulation roller, and forming grooves are formed in the first granulation roller and the second granulation roller. The granulation device has the beneficial effects that finished product particles are more compact through two-time extrusion, when the forming grooves of the first granulation roller and the third granulation roller are matched, the finished product particles are separated from a net-shaped waste belt, burrs do not exist on the peripheries of the finished product particles, crushing treatment does not need to be conducted, and the quality of the finished product particles is effectively improved.

Description

Technical Field

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

[0002] The double-roll extrusion granulator is a device that processes powdery materials into granular products through double-roll extrusion. Its working principle is: the material is added from the feed port, extruded by two counter-rotating rollers, and agglomerated into dense particles under the action of pressure and shear force, and then crushed and screened to obtain the finished product. The equipment adopts normal temperature granulation technology, does not require drying measures, and simplifies the production process.

[0003] The application document with the publication number CN112156721A discloses a double-roll granulator, which includes a first roller, a second roller and a power mechanism, wherein the first cylinder in the first roller is fixed to the first rotating shaft and can rotate around the first rotating shaft, the outer surface of the first cylinder is provided with a plurality of first grooves, the first elastic layer is attached to the outer surface of the first cylinder and covers the first cylinder, the first pressing layer is attached to the outer surface of the first elastic layer and covers the first elastic layer, the outer surface of the first pressing layer is provided with a plurality of first through holes, when the first elastic layer is pressed to fit the surface of the first groove, the first through hole is connected with the first groove to form a first half cavity; the second rotating shaft in the second roller is arranged parallel to the first rotating shaft; the power mechanism is used to drive the first roller and the second roller to rotate, so that the first half cavity is connected with the second half cavity and forms a granulation cavity. The double-roll granulator provided in the document can also form and discharge materials well when processing materials with a low degree of dryness, and the processing effect is good.

[0004] Most common fertilizer granulation 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 particles to form a flaky structure, and ultimately rely on crushing and screening devices for secondary processing to achieve effective separation. This method will not only cause a large number of burrs on the finished particles, but also easily cause the finished particles to break during crushing, affecting the quality and efficiency of granulation. Summary of the invention

[0005] The present invention provides a granulating device for compound fertilizer production and a granulating method thereof, aiming to solve the technical problem that a large number of irregular burrs will be generated on the edge of the material during the granulation process of the granulator in the related technology, and these burrs will adhere to the finished particles to form a flaky structure, and finally 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 be broken during crushing, thereby affecting the quality and efficiency of granulation.

[0006] The present invention discloses a granulating device for producing compound fertilizer, comprising: a box body, a feeding cavity is provided in the box body, a primary extrusion module and a secondary extrusion module are also provided in the box body; the primary extrusion module comprises a first granulating roller and a second granulating roller which are horizontally rotated at a material outlet of the feeding cavity, the second granulating roller and the first granulating roller are arranged up and down, and there is a gap between the two for materials to pass through so as to extrude the materials into a material belt, 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 is rotated in the box body and is connected to the first granulating roller; The third granulating roller is abutted against the granulating roller, and the third granulating roller is horizontally arranged with respect to the axis of the first granulating roller. The third granulating roller is also provided with a molding groove, and the molding groove is the same size as that on the first granulating roller and corresponds one to one. A horizontal pit is provided between two adjacent molding grooves in the circumferential direction of the third granulating roller, and horizontally penetrates from front to back. A circumferential pit is provided between two adjacent molding grooves along its axial direction, which is perpendicular to the horizontal pit and connected with the horizontal pit. 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, and the air hole can be connected with the negative pressure cavity or the positive pressure cavity as the third granulating roller rotates.

[0007] Beneficial effect: the material will be squeezed into a material belt through the gap between the first granulation roller and the second granulation roller, and the semi-finished particles formed by the forming grooves on the first granulation roller and the second granulation roller will be on both sides of the material belt respectively, and then the material belt reaches between the first granulation roller and the third granulation roller, and the smaller semi-finished particles on the material belt will enter the forming groove on the third granulation roller. As the forming grooves of the first granulation roller and the third granulation roller coincide, the forming groove on the third granulation roller presses the smaller semi-finished particles and the material belt to the forming groove on the first granulation roller, thereby forming a complete finished particle. As the first granulation roller and the third granulation roller rotate, the finished particles fall, and the excess waste enters the circumferential pits and the horizontal pits to form a mesh waste belt. The third granulation roller can squeeze the semi-finished material again, and the finished particles are more compact after two squeezes. Moreover, when the forming grooves of the first granulation roller and the third granulation roller coincide, the finished particles are separated from the mesh waste belt, and there is no burr around the finished particles, and no crushing is required, which effectively improves 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, an upper protrusion and a lower protrusion are arranged 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 net-like 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-rear 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 recovery and reuse.

[0012] Preferably, a blowing pipe is fixedly installed in the box, 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 is that the finished product particles may be attached to the third granulation roller, and the spray holes can blow off the finished product particles attached to the third granulation 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 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 slidingly 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, and 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.

[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 meshes 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 meshes 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 a tensioning wheel cooperating with the transmission belt is provided on the box body.

[0019] Preferably, an inclined blanking plate is provided at the bottom of the box body, 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: Step 1, adding materials into the feeding cavity of the box; Step 2: the material passes between the first granulation roller and the second granulation roller, and the gap between the first granulation roller and the second granulation roller squeezes the material into a material belt. The semi-finished particles formed by the forming grooves on the first granulation roller and the second granulation roller are respectively located on both sides of the material belt, and the volume of the semi-finished particles on the first granulation roller is greater than that on the second granulation roller. Step 3: The extruded material enters between the first granulation roller and the third granulation roller, and the forming groove on the third granulation roller squeezes the material toward the forming groove on the first granulation roller, thereby forming finished granules, and the waste material is squeezed into the circumferential pits and horizontal pits to form a mesh waste belt; 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 with the negative pressure chamber to adsorb the mesh waste belt. When the mesh waste belt is on the left side, the air holes are connected with the positive pressure chamber to blow the mesh waste belt off.

[0021] By adopting the above technical scheme, 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 granulation roller and the second granulation roller, and the semi-finished particles formed by the forming grooves on the first granulation roller and the second granulation roller will be respectively on both sides of the material belt, and then the material belt reaches between the first granulation roller and the third granulation roller, and the smaller semi-finished particles on the material belt will enter the forming groove on the third granulation roller, and as the forming grooves of the first granulation roller and the third granulation roller coincide, the forming groove on the third granulation roller presses the smaller semi-finished particles and the material belt onto the first granulation roller The first granulating roller and the third granulating roller rotate, and 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, and when the forming grooves of the first granulating roller and the third granulating roller coincide, the finished particles are separated from the mesh waste belt, and there is no burr around the finished particles, and no crushing is required, which effectively improves the quality of the finished particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a cross-sectional view of the present invention.

[0024] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle.

[0025] Figure 4 It is a schematic diagram of the internal structure of the present invention.

[0026] Figure 5 It is a schematic structural diagram of the second driving wheel of the present invention.

[0027] Figure 6 It is a schematic structural diagram of the second transmission gear of the present invention.

[0028] Figure 7 It is a schematic structural diagram of the first granulation roller of the present invention.

[0029] Figure 8 It is a schematic structural diagram of the third granulation roller of the present invention.

[0030] Fig. 9 For the present invention Figure 8 Enlarged view of point B in the middle.

[0031] Fig.10 It is a cross-sectional view of the third granulating roller of the present invention.

[0032] Fig.11 It is a schematic structural diagram of the fixed shaft of the present invention.

[0033] Fig.12 It is a schematic diagram of the material of the present invention being extruded into a material strip shape.

[0034] Reference numerals: 10. Box; 11. Feeding hopper; 12. Base; 13. Side plate; 14. Bottom plate; 15. Protective plate; 16. Dropping plate; 20. First granulation roller; 21. Second granulation roller; 22. Forming groove; 23. Driving 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 drive wheel; 44, second drive wheel; 45, transmission belt; 46, tension 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 drive wheel; 73, fourth drive wheel. DETAILED DESCRIPTION

[0035] 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.

[0036] like Figures 1 to 12 As shown, a specific embodiment of a granulating device for compound fertilizer production of the present invention includes a bearing module, a primary extrusion module, a secondary extrusion module and a waste crushing module.

[0037] like Figure 1 and Figure 2 As shown, the carrying module includes a box body 10 , a hopper 11 , a base 12 , a side plate 13 , a bottom plate 14 , a protective plate 15 and a blanking plate 16 .

[0038] The box body 10 is a square structure. A base 12 is provided at the bottom of the box body 10 . A hopper 11 communicating with the inner side of the box body 10 is provided on the upper surface of the box body 10 .

[0039] A vertically arranged side plate 13 and an inclined bottom plate 14 are provided inside the box body 10, and the front and rear ends of the side plates 13 and the bottom plate 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 plates 13 and the bottom plate 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.

[0040] 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.

[0041] The bottom of the box 10 is an open structure, and an inclined blanking plate 16 is provided on the base 12. After being processed by the primary extrusion module and the secondary extrusion module in the box 10, the finished particles will fall on the blanking plate 16 and be discharged to the outside of the device. The blanking plate 16 is covered with filter holes, and the size of the filter holes can be set according to the size of the particles to be produced. The filter holes can filter out the debris particles in the finished particles to ensure the production quality.

[0042] 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.

[0043] A first granulating roller 20 and a 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 with an interval 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.

[0044] like Figure 7As shown, the first granulation roller 20 and the second granulation roller 21 are uniformly provided with forming grooves 22, that is, the first granulation roller 20 and the second granulation roller 21 are 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 one by one.

[0045] 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 both coaxially arranged.

[0046] 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 .

[0047] A driving motor 23 is fixedly installed inside 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.

[0048] A second transmission gear 26 fixedly connected to the first granulation roller 20 is rotatably mounted on the rear side of the box 10, and a third transmission gear 27 fixedly connected to the second granulation roller 21 is also rotatably mounted on the rear side of the box 10. The second transmission gear 26 meshes with the third transmission gear 27 and the diameters of the two are the same. The first transmission gear 25 meshes with the second transmission gear 26, so that the first transmission gear 25 can drive the second transmission gear 26 and the third transmission gear 27 to rotate, so as to realize the rotation of the first granulation roller 20 and the second granulation roller 21, and perform preliminary extrusion and granulation on the material.

[0049] When the material passes between the first granulation roller 20 and the second granulation roller 21, it will be squeezed into Fig.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, the semi-finished particles on the second granulation roller 21 are more likely to fall off as the first granulation roller 20 and the second granulation roller 21 rotate, and 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 granulation.

[0050] It is particularly emphasized that the distance from the highest point of the arc-shaped edge of the semi-finished particles on the second granulation roller 21 to the material belt plus the thickness of the material belt is greater than the radius of the semi-finished particles on the first granulation roller 20. That is, when extruded by the secondary extrusion module, the volume of the semi-finished particles on the second granulation roller 21 plus the volume of the middle material belt after extrusion can be greater than the volume of the semi-finished particles on the second granulation roller 21. Thereby, the finished particles can be extruded more compactly, avoiding the situation where the finished particles have defects due to insufficient materials.

[0051] Since there is a gap between the first granulating roller 20 and the second granulating roller 21 , a pounding unit is provided to make the material entering between the two relatively compact and ensure that the two can squeeze the material into the shape of a material strip.

[0052] like Figure 4 As shown, the tamping unit includes a tamping frame 30 , a control arm 31 and a cam 32 .

[0053] A tamping frame 30 is arranged in the box body 10. The tamping frame 30 is a plate-like structure composed of multiple tamping 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 tamping frame 30 are respectively inserted into the avoidance holes and slidably cooperate with the avoidance holes. A spring is also arranged on the tamping frame 30, one end of the spring is connected to the tamping frame 30, and the other end is connected to the inside of the box body 10. A control arm 31 fixedly connected to the tamping frame 30 is provided on the front side of the box body 10, and a pushing portion is provided on the control arm 31. 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, and the cam 32 abuts against the pushing portion of the control arm 31, so that when the second granulating roller 21 rotates, the control arm 31 can be continuously pushed to reciprocate, and the control arm 31 drives the tamping frame 30 to continuously slide back and forth, and the tamping frame 30 is directed toward 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.

[0054] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, the secondary extrusion module includes a secondary extrusion unit, a suction unit and a blowing unit.

[0055] The secondary extrusion unit includes a third granulation 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 .

[0056] 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 along the front-rear direction, and the interior of the third granulating roller 40 is a hollow structure.

[0057] 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 axis of the third granulating roller 40 and the first granulating roller 20 is in a horizontal state. 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 against each other, and the linear speed of the meshing point of the third granulating roller 40 and the first granulating roller 20 is consistent, so when the two rotate, when the forming grooves 22 on the two reach the abutment, the forming grooves 22 are all in one-to-one correspondence, so that the material can be completely squeezed into granules.

[0058] A first driving wheel 43 connected to the first granulating roller 20 is rotatably mounted on the front side of the housing 10, and the rotating shaft of the third granulating roller 40 extends to the front side of the housing 10. The rotating shaft of the third granulating roller 40 is also an open structure at both ends and is connected to the inside of the third granulating roller 40. A second driving wheel 44 is fixedly mounted on the portion of the rotating shaft of the third granulating roller 40 located on the front side of the housing 10, and the first driving wheel 43 and the second driving wheel 44 are connected by a transmission belt 45. When the first granulating roller 20 rotates, the third granulating roller 40 can be driven to rotate by the first driving wheel 43 and the second driving wheel 44. It is particularly emphasized that the size ratio of the first granulating roller 20 and the third granulating roller 40 is the same as the size ratio of the first driving wheel 43 and the second driving wheel 44.

[0059] Tensioning wheels 46 are installed at the upper and lower positions of the front side of the box body 10, and the two tensioning wheels 46 respectively tension the upper and lower parts of the transmission belt 45. The tensioning wheels 46 can be adjusted up and down, so as to adjust the tension of the transmission belt 45 according to the needs to ensure the rotation accuracy of the first granulation roller 20 and the third granulation roller 40. The tensioning wheels 46 and the specific adjustment mechanism belong to the prior art and are not described in detail here.

[0060] In this embodiment, the first driving wheel 43, the second driving wheel 44 and the transmission belt 45 are chain-driven, that is, the first driving wheel 43 and the second driving wheel 44 are gear structures, and the transmission belt 45 is a chain structure. In other embodiments, the first driving wheel 43 and the second driving wheel 44 can also be synchronous pulleys, and the transmission belt 45 is a synchronous belt, which can still realize the transmission of the third granulating roller 40.

[0061] like Figure 8 and Fig. 9 As 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.

[0062] A circumferential pit 42 perpendicular to the horizontal pit 41 is provided between two adjacent forming grooves 22 along the axial direction of the third granulating roller 40. The circumferential pits 42 are connected to the horizontal pits 41, and the cross-section of the circumferential pits 42 is also V-shaped. The circumferential pits 42 and the horizontal pits 41 form a mesh structure on the third granulating roller 40, covering the forming grooves 22 in each small unit on the inside, and making the position of each forming groove 22 a tetrahedral pyramid structure. The axis of the forming groove 22 coincides with the axis of the tetrahedral pyramid.

[0063] When the primary extrusion module is extruded into Fig.12 When the material of the shape shown reaches between the first granulation roller 20 and the third granulation roller 40, the smaller semi-finished particles on the material belt will enter the forming groove 22 on the third granulation roller 40. As the forming grooves 22 of the first granulation roller 20 and the third granulation roller 40 coincide, the forming grooves 22 on the third granulation roller 40 press the smaller semi-finished particles and the material belt toward the forming grooves 22 on the first granulation roller 20, thereby forming complete finished particles. When the forming grooves 22 of the first granulation roller 20 and the third granulation roller 40 coincide, the semi-finished material can be squeezed again, making the finished particles more compact and improving the hardness of the finished product. Since the material belt is thick, the excess part will enter the peripheral circumferential pits 42 and horizontal pits 41, thereby forming a mesh waste belt.

[0064] As the first granulation roller 20 and the third granulation roller 40 rotate, the finished particles fall onto the blanking plate 16 when they rotate downward and are discharged, 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.

[0065] like Figure 3 , Fig.10 and Fig.11 As shown, the suction unit includes a fixed shaft 50 , an upper protrusion 51 , a lower protrusion 52 and an air pipe 55 .

[0066] The fixed shaft 50 is sealed and rotatably mounted in the third granulating roller 40, and the fixed shaft 50 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, and the air pipes 55 on both sides pass through the rotating shaft of the third granulating roller 40 and are respectively fixedly mounted on the front and rear protection plates 15, and the air pipes 55 on both sides are connected to air pumps, and the air pump on the front air pipe 55 is used for suction, and the air pump on the rear air pipe 55 is used for blowing.

[0067] The upper protrusion 51 is provided at the upper right position of the fixed shaft 50, and the lower protrusion 52 is provided at the lower left position of the fixed shaft 50. The upper protrusion 51 and the lower protrusion 52 are both in sealing and sliding cooperation with the inner wall of the third granulating roller 40. The upper protrusion 51 and the lower protrusion 52 divide the inner wall 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 a side close to the first granulating roller 20, and the positive pressure chamber 54 is located on a side away from the first granulating roller 20. The negative pressure chamber 53 is communicated with the air pipe 55 on the front side, and the positive pressure chamber 54 is communicated with the air pipe 55 on the rear side.

[0068] 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 side along with the third granulation roller 40, the air holes 56 are connected to the positive pressure chamber 54, so as to blow 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.

[0069] The blowing unit includes a blowing pipe 60 fixedly installed in the box 10, the blowing pipe 60 is located at the lower left of the third granulating roller 40, and the blowing pipe 60 is parallel to the axis of the third granulating roller 40. The blowing pipe 60 is connected to an air pump, and a plurality of spray holes 61 are arranged on the blowing pipe 60 along its axial direction, and 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.

[0070] like Figure 2 and Figure 6 As shown, the pulverizing module includes a partition 70 and a pulverizing shaft 71 .

[0071] A partition 70 is provided in the box body 10, and the partition 70 is located at the lower left position of the third granulation roller 40. A crushing shaft 71 is rotatably mounted on the left side of the partition 70, and the axis of the crushing shaft 71 extends in the front-back direction. The net-like waste blown off from the third granulation roller 40 will fall on the crushing shaft 71 for crushing and then fall down, and the crushed waste can be recycled.

[0072] 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 is connected to the fourth driving wheel 73 by a belt, so that the third granulating roller 40 can drive the crushing shaft 71 to rotate.

[0073] 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: Step 1: Add the material into the feeding chamber in the box body 10 through the feeding hopper 11; Step 2: The material passes between the first granulation roller 20 and the second granulation roller 21. The gap between the first granulation roller 20 and the second granulation roller 21 squeezes the material into a material belt. The semi-finished particles formed by the forming grooves 22 on the first granulation roller 20 and the second granulation roller 21 are respectively located on both sides of the material belt, and the volume of the semi-finished particles on the first granulation roller 20 is greater than that on the second granulation roller 21. 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. Step 4: the finished particles fall onto the blanking plate 16 below. As the third granulating roller 40 rotates, when the net-like waste belt is located on the right side, the air hole 56 is connected with the negative pressure chamber 53 to absorb the net-like waste belt. When the net-like waste belt is located on the left side, the air hole 56 is connected with the positive pressure chamber 54 to blow the net-like waste belt off. Step 5: The mesh waste belt falls onto the crushing shaft 71 for crushing and recycling.

[0074] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A granulating device for compound fertilizer production, comprising: A box body, wherein a feeding cavity is provided in the box body, and wherein a primary extrusion module and a secondary extrusion module are also 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 the material to pass through so as to extrude the material into a material belt, the first granulation roller and the second granulation 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 granulation roller is larger than the forming groove on the second granulation roller; The secondary extrusion module includes a third granulating roller rotating in the box body and abutting 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 molding groove, which is the same size as the molding groove on the first granulating roller and corresponds one to one. A horizontal pit is provided between two adjacent molding grooves in the circumferential direction of the third granulating roller, which is horizontally connected front and back. A circumferential pit is provided between two adjacent molding grooves along its axial direction, which is perpendicular to the horizontal pit and connected with the horizontal pit. 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 for sealing and rotation. The fixed shaft is fixedly connected to the box body, and an upper protrusion and a lower protrusion are arranged 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.

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, and 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. 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.

5. A granulating device for compound fertilizer production according to claim 1, characterized in that: A tamping frame is arranged in the box body, and the front and rear side walls of the box body are both provided with long strip avoidance through-holes penetrating front and back. The front and rear ends of the tamping frame are respectively inserted into the avoidance through-holes and slidingly cooperate with the avoidance through-holes. A spring is also arranged on the tamping frame, one end of the spring is connected with the tamping frame, and the other end is connected with the box body. A control arm fixedly connected with the tamping frame is arranged on the front side of the box body, and a pushing portion is provided on the control arm. 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, and 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 pits and the horizontal pits are both V-shaped structures.

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 meshes 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 meshes 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 a tensioning wheel matched with the transmission belt is provided on the box body.

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 filter holes are provided on the blanking plate.

10. A granulation method for compound fertilizer production, characterized in that: The granulation device according to claim 1 comprises the following steps: Step 1, adding materials into the feeding cavity of the box; Step 2: the material passes between the first granulation roller and the second granulation roller, and the gap between the first granulation roller and the second granulation roller squeezes the material into a material belt. The semi-finished particles formed by the forming grooves on the first granulation roller and the second granulation roller are respectively located on both sides of the material belt, and the volume of the semi-finished particles on the first granulation roller is greater than that on the second granulation roller. Step 3: The extruded material enters between the first granulation roller and the third granulation roller, and the forming groove on the third granulation roller squeezes the material toward the forming groove on the first granulation roller, thereby forming finished granules, and the waste material is squeezed into the circumferential pits and horizontal pits to form a mesh waste belt; 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 with the negative pressure chamber to adsorb the mesh waste belt. When the mesh waste belt is on the left side, the air holes are connected with the positive pressure chamber to blow the mesh waste belt off.

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