Granulator for high-tower compound fertilizer production and granulation method

Abstract

The invention relates to the technical field of compound fertilizer preparation, in particular to a granulator for high-tower compound fertilizer production and a granulation method.The granulator comprises a storage bin, a communicating pipe and a spray head, and mixed slurry placed in the storage bin can enter the spray head from the communicating pipe and is sprayed out; the filter is fixedly mounted in the communicating pipe, and a backflow structure is arranged on the filter; the partition plate is arranged in the backflow structure, a plurality of sets of extrusion holes are formed in the partition plate at equal intervals, and the backflow structure can pump the large-particle raw materials screened out by the filter to the partition plate; and the pushing structure is arranged on the communicating pipe, the pushing structure can act towards the partition plate to extrude the large-particle raw materials on the partition plate, and in the extrusion process, ejector pins arranged on the pushing structure can penetrate through the extrusion holes to refine the raw materials and guarantee the particle forming effect.

Description

Technical Field

[0001] The invention relates to the technical field of compound fertilizer preparation, in particular to a granulator and a granulation method for high-tower compound fertilizer production. Background Art

[0002] In the high-tower granulation stage of compound fertilizer production, the main process flow is as follows: the raw materials are first heated and melted, and then sprayed into the interior of the tower in the form of a fine liquid stream with the help of a nozzle. At this time, the fine liquid stream breaks into droplets after contact with the air. These droplets meet the cold air rising from the bottom of the tower and heat exchange occurs. The cold air continuously takes away the heat in the liquid particles, causing the liquid particles to cool down, and finally cool and solidify into compound fertilizer particles with a certain strength.

[0003] However, in actual operation, there are some problems in the raw material mixing and heating and melting process. If the mixing is uneven, or the steam and water spraying amount are improperly controlled, some large particles will be produced in the raw materials after heating and melting. If these large particles of raw materials directly enter the nozzle, it is very easy to cause local blockage of the nozzle, which in turn leads to increased pressure inside the nozzle or partial non-spraying of raw materials, resulting in an unbalanced distribution of raw materials in the tower. In the subsequent cooling link, the raw materials will also stick together into large particles or lumps.

[0004] To address this problem, existing technologies mostly install a filter at the front end of the nozzle, and the filter aperture of the filter is smaller than the injection aperture of the nozzle, so as to filter out large particles of raw materials to ensure the raw material injection effect. However, this approach also brings new problems, that is, the filter itself is more likely to be clogged, resulting in insufficient raw material supply. Although the impact can be reduced by frequently removing and cleaning the filter, it requires equipment shutdown, which seriously affects production efficiency. Summary of the Invention

[0005] The object of the present invention is to provide a granulator and a granulation method for producing high-tower compound fertilizer to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A granulator for producing high-tower compound fertilizer, comprising: A storage bin, a connecting pipe and a nozzle, wherein the mixed slurry placed in the storage bin can enter the nozzle through the connecting pipe and be sprayed out; It is characterized by further comprising: A filter is fixedly installed in the connecting pipe, and a reflux structure is provided on the filter; A partition is provided inside the reflux structure, and a plurality of extrusion holes are provided on the partition at equal intervals. The reflux structure can pump the large particles of raw materials screened by the filter to the partition; A pushing structure is provided on the connecting pipe. The pushing structure can move toward the partition to squeeze the large-particle raw materials on the partition. During the extrusion process, the ejector pin provided on the pushing structure can penetrate the extrusion hole.

[0007] As a further solution of the present invention: the filter is a conical shell structure, and a plurality of filter holes are provided on the side wall of the filter, and the axis direction of the filter holes is perpendicular to the edge line of the cross section of the filter.

[0008] As a further solution of the present invention: the pore size of the extrusion hole is smaller than the pore size of the filtering hole.

[0009] As a further embodiment of the present invention, the reflux structure includes a reflux pipe integrally formed with the filter, the upper end of the reflux pipe being connected to a reflux pump device disposed outside the connecting pipe via a conduit, and the liquid outlet of the reflux pump device being connected to the connecting pipe; The other end of the return pipe is provided with a return hole, and the lower end of the return hole is flush with the lower end of the inner side of the filter; The partition is arranged inside the reflux pipe.

[0010] As a further solution of the present invention: the pushing structure includes a pushing member that penetrates the filter and slides in contact with the inner wall of the return pipe, and the pushing member is provided with the ejector pin; The pushing structure further includes an electric telescopic rod fixedly mounted on the side wall of the connecting pipe, the electric telescopic rod being connected to a sleeve member sealingly and slidingly arranged on the outer wall of the connecting pipe, a slide groove being provided on the connecting pipe, a connecting plate fixed on the sleeve member passing through the slide groove and being able to slide relative to the length direction of the slide groove, and an end of the connecting plate away from the sleeve member being fixed to the pushing member; When the sleeve fitting slides on the connecting pipe, the sleeve fitting always keeps blocking the sliding groove.

[0011] As a further solution of the present invention: the storage bin is connected to the connecting pipe through a circulation channel, a high-frequency vibration generator is installed on the circulation channel, and the high-frequency vibration generator extends into the interior of the circulation channel and forms an annular channel between the generator and the inner wall of the circulation channel.

[0012] As a further embodiment of the present invention, the connecting pipe is rotatably connected to the nozzle, a second gear is fixedly mounted on the nozzle, a driving motor is fixedly mounted on the outside of the connecting pipe, and a first gear meshing with the second gear is fixedly mounted on the output shaft of the driving motor; The side wall of the nozzle is provided with a spray hole.

[0013] As a further solution of the present invention: the nozzle is further provided with a plurality of baffles at equal intervals around the circumference, and the upper ends of the baffles are connected to inclined plates; When the raw material enters the nozzle, the nozzle can drive the raw material to rotate so as to throw the raw material out from the nozzle hole.

[0014] A method for granulating using the high-tower compound fertilizer production granulator comprises the following steps: Step 1: Mix and heat the raw materials of compound fertilizer and then pour them into the storage bin; Step 2: Start the drive motor to drive the nozzle to rotate. The raw materials enter the annular channel under the action of gravity to eliminate bubbles. Then, when entering the nozzle, they rotate with the nozzle and are thrown out under the action of centrifugal force. They interact with the rising cold air in the tower to form compound fertilizer particles with a certain strength. Step 3: When the drive motor starts, the reflux mechanism starts to operate synchronously, allowing the raw materials to circulate in the connecting pipe and drain the large particles of raw materials screened by the filter to the partition. Step 4: The push mechanism is activated to squeeze the large particles of raw material on the partition, causing them to flow out from the other side of the extrusion hole and circulate into the connecting pipe; Step 5: Reset the push structure and repeat step 4.

[0015] Compared with the prior art, the present invention has the following beneficial effects: On the one hand, the filter can screen and filter large-particle raw materials, thereby preventing large-particle materials from directly clogging the nozzle, maintaining a constant injection pressure of the nozzle, and avoiding a decrease in the spraying range caused by local clogging of the nozzle. On the other hand, by circulating the large-particle raw materials, they can be accumulated on the partition. At the same time, the extrusion effect between the pusher and the partition can be used to squeeze and crush the large-particle raw materials into particles with smaller particle sizes. When they are circulated into the raw materials again, they can pass through the filter and participate in the production of compound fertilizer, thereby improving the utilization rate of raw materials. At the same time, the elimination of large-particle raw materials occurs inside the connecting pipe, which does not affect the normal supply of raw materials, but improves the continuity of compound fertilizer production, reduces equipment downtime, and ensures production efficiency. By setting up the high-frequency vibration generator and the annular channel, the raw materials can enter the annular channel and come into uniform contact with the high-frequency vibration generator, so that the bubbles in the raw materials can be evenly broken. In the process of bubble breaking, the large particles of raw materials can also be broken. To a certain extent, the raw materials can be refined, the stability and uniformity of the raw materials during spraying can be improved, and the structural strength of the compound fertilizer particles can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a structural diagram of an embodiment of a granulator for producing high-tower compound fertilizer.

[0017] Figure 2 This is a structural schematic diagram of an embodiment of a granulator for high-tower compound fertilizer production with the frame structure removed.

[0018] Figure 3 This is an exploded view of the structure of the nozzle and connecting pipe in one embodiment of a granulator for high-tower compound fertilizer production.

[0019] Figure 4 This is a schematic diagram of the internal structure of a nozzle in one embodiment of a granulator for high-tower compound fertilizer production.

[0020] Figure 5 This is a schematic diagram of the internal structure of the connecting pipe in one embodiment of a granulator for high-tower compound fertilizer production.

[0021] Figure 6 This is a schematic diagram of the internal structure of a filter in one embodiment of a granulator for high-tower compound fertilizer production.

[0022] Figure 7 This is the cross section of the filter and the return pipe in one embodiment of a granulator for high-tower compound fertilizer production.

[0023] Figure 8 This is a schematic diagram of the connection structure between the pusher and the electric telescopic rod in one embodiment of a granulator for high-tower compound fertilizer production.

[0024] Figure 9 This is a schematic structural diagram of an annular channel in one embodiment of a granulator for high-tower compound fertilizer production.

[0025] Figure 10 This is a cross-sectional view of the connection state of the pushing member, the sleeve member and the connecting pipe in one embodiment of a granulator for high-tower compound fertilizer production.

[0026] Figure 11 for Figure 10 A magnified view of the structure at point A in the middle.

[0027] In the figure: 1. frame structure; 2. storage bin; 3. connecting pipe; 301. chute; 4. nozzle; 401. spray hole; 402. baffle; 403. tilting plate; 5. driving motor; 6. first gear; 7. second gear; 8. filter; 801. filter hole; 9. return pipe; 901. return hole; 10. return pump device; 11. partition; 1101. extrusion hole; 12. push piece; 1201. ejector pin; 13. fitting piece; 1301. connecting plate; 14. electric telescopic rod; 15. circulation channel; 16. high-frequency vibration generator; 17. annular channel. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0030] See also Figures 1 to 9 In an embodiment of the present invention, a granulator for producing high-tower compound fertilizer includes: a storage bin 2, a connecting pipe 3 and a nozzle 4, a filter 8, a partition 11, and a push structure.

[0031] The storage bin 2, the connecting pipe 3 and the nozzle 4 are provided so that the mixed slurry in the storage bin 2 can enter the nozzle 4 through the connecting pipe 3 and be sprayed out, wherein the connecting pipe 3 is provided on the frame structure 1; The filter 8 is fixedly installed in the connecting pipe 3. In detail, the filter 8 has a conical shell structure, and multiple groups of filter holes 801 are provided on the side wall of the filter 8. The axial direction of the filter hole 801 is perpendicular to the edge line of the cross section of the filter 8. Since the filter 8 has a conical shell structure, it can provide more filter holes 801 on its surface compared with the traditional flat plate filter device, thereby improving the filtration rate, improving the pass rate of the raw materials, and ensuring the supply of raw materials.

[0032] During the rotation of the nozzle 4, centrifugal force can be generated to throw out the raw materials, and with the effect of the raw materials' own gravity, the raw materials can move downward along the length direction of the connecting pipe 3, and in the process of the raw materials passing through the filter 8, the filter 8 screens the raw materials so that large particles of raw materials will not move toward the nozzle 4, thereby ensuring that the nozzle 4 will not be blocked and ensuring that the injection pressure and injection range of the nozzle 4 are constant. In the process of the raw materials passing through the filter 8, large particles of raw materials can be screened out and are at the feed end of the filter 8. At the same time, the reflux structure acts synchronously, so that these large particles can move toward the inside of the reflux structure under the push of the vertical raw material flow and the suction of the reflux structure, thereby preventing large particles of raw materials from accumulating on the filter 8, resulting in a decrease in the amount of raw materials entering the nozzle 4, and further maintaining the stability of the raw material supply.

[0033] Furthermore, by making the axial direction of the filter hole 801 perpendicular to the edge line of the cross section of the filter 8, it is possible to further prevent large-particle raw materials from clogging the filter hole 801. The reason is that: when the raw material initially moves in the vertical direction, the large-particle material will also move in the vertical direction, and when the raw material moves onto the filter 8, its movement path has a small-angle bending phenomenon. At this time, the raw material with a composite predetermined particle size has a smaller mass and smaller inertia, so it can more easily bend the path and pass through the filter hole 801. However, for large-particle raw materials, their inertia is greater, making it difficult for the movement path to bend. At this time, when they are on the upper surface of the filter 8, they can move along its upper surface and enter the inside of the reflux structure under the action of the reflux structure, thereby preventing large-particle raw materials from accumulating on the filter 8.

[0034] The filter 8 is provided with a reflux structure, which includes a reflux pipe 9 integrally formed with the filter 8. The upper end of the reflux pipe 9 is connected to a reflux pump device 10 provided outside the connecting pipe 3 through a conduit, and the liquid outlet of the reflux pump device 10 is connected to the connecting pipe 3. A reflux hole 901 is provided at the other end of the reflux pipe 9 . The lower end of the reflux hole 901 is flush with the inner lower end of the filter 8 . The partition 11 is provided inside the reflux pipe 9 .

[0035] During use, the return pump device 10 works, thereby generating negative pressure inside the return pipe 9. Under the action of negative pressure, large-particle raw materials (including some raw materials with predetermined particle sizes) can enter the return pipe 9 along the return hole 901. At this time, the partition 11 in the return pipe 9 can further filter the raw materials entering the return pipe 9. When a certain degree of large-particle raw materials are accumulated on the partition 11, the pushing structure can cooperate with the partition 11, and through the extrusion effect, the large-particle raw materials are squeezed into small-particle raw materials and circulated to the connecting pipe 3 again, realizing the recycling of large-particle raw materials. Moreover, since the large-particle raw materials are eliminated inside the connecting pipe 3, the device does not need to be shut down, thereby improving the continuous production of compound fertilizer.

[0036] See also Figures 6 to 8 , the partition 11 is provided with multiple groups of extrusion holes 1101 at equal intervals, and the reflux structure can pump the large particles of raw materials screened by the filter 8 to the partition 11. Specifically, the aperture of the extrusion hole 1101 is smaller than the aperture of the filter hole 801; The pushing structure is provided on the connecting pipe 3 and can move toward the partition 11 to squeeze the large particles of raw materials on the partition 11. During the squeezing process, the ejector pin 1201 provided on the pushing structure can penetrate the squeezing hole 1101. The pushing structure includes a pushing member 12 that penetrates the filter 8 and slides in contact with the inner wall of the return pipe 9, and the pushing member 12 is provided with the ejector pin 1201; The pushing structure further includes an electric telescopic rod 14 fixedly mounted on the side wall of the connecting pipe 3, the electric telescopic rod 14 being connected to a sleeve member 13 sealingly and slidably provided on the outer wall of the connecting pipe 3, the connecting pipe 3 being provided with a slide groove 301, a connecting plate 1301 fixed on the sleeve member 13 passing through the slide groove 301 and being able to slide relative to the length direction of the slide groove 301, and an end of the connecting plate 1301 away from the sleeve member 13 being fixed to the pushing member 12; When the sleeve 13 slides on the connecting pipe 3, the sleeve 13 always keeps the chute 301 blocked to prevent the raw material from overflowing. For details, please refer to Figure 10-11 In the figure, b is the length of the sleeve 13 used to block the slide groove 301, and c is the length of the slide groove 301. b is greater than twice c.

[0037] When the raw materials enter the reflux pipe 9, the extrusion hole 1101 can perform secondary filtration on the raw materials and cause the large-particle raw materials to accumulate on the side of the partition 11 facing the push piece 12. A pressure sensor is provided in the return pump device 10. When the detection value of the pressure sensor is greater than the preset value, the electric telescopic rod 14 will move and drive the push piece 12 toward the partition 11 through the sleeve 13. During this process, the return pump device 10 will stop working. When the push piece 12 acts on the large-particle raw materials, it can cooperate with the partition 11 to produce an extrusion action on the large-particle raw materials, so that the large-particle raw materials can be discharged from the extrusion hole 1101 and form raw material particles with a smaller diameter. When it rotates into the connecting pipe 3 again, it can pass through the filter hole 801 and be sprayed into the interior of the high tower to produce compound fertilizer.

[0038] Among them, the aperture of the extrusion hole 1101 is smaller than the aperture of the filter hole 801, so that the particle size of the raw material extruded through the extrusion hole 1101 can be smaller than the aperture of the filter hole 801, making it easier for it to pass through the filter hole 801, preventing the raw material from being screened and discharged by the filter hole 801 again during the circulation process, resulting in it being unable to participate in the spraying action, thereby improving the utilization rate of the raw material to a certain extent. Furthermore, the circumferential diameter of the ejector pin 1201 is smaller than the aperture of the extrusion hole 1101. This setting firstly makes the two better cooperate and prevents interference between the two from causing the ejector pin 1201 to be compressed and bent. Secondly, in the case of large particles During the extrusion of the raw materials, when the ejector pin 1201 has entered the extrusion hole 1101, the raw materials remaining between the partition 11 and the pushing member 12 can flow out from the gap between the extrusion hole 1101 and the ejector pin 1201, thereby avoiding the phenomenon that the raw materials are squeezed but cannot flow out due to the ejector pin 1201 blocking the extrusion hole 1101. At the same time, when the extrusion is completed, since the ejector pin 1201 penetrates the extrusion hole 1101, it can avoid the phenomenon that large particles of raw materials enter the extrusion hole 1101 during the extrusion process and get stuck, thereby ensuring the unobstructedness of the extrusion hole 1101 and making the circulation of the raw materials smoother.

[0039] Based on the above arrangement, on the one hand, large-particle raw materials can be screened through the filter 8, thereby preventing large-particle materials from directly clogging the nozzle 4, maintaining the constant injection pressure of the nozzle 4, and avoiding local clogging of the nozzle 4 resulting in a decrease in the spraying range. On the other hand, by circulating the large-particle raw materials, they can be accumulated on the partition 11. At the same time, by utilizing the extrusion effect between the push piece 12 and the partition 11, the large-particle raw materials can be squeezed and crushed into particles with smaller particle sizes, so that when they are circulated into the raw materials again, they can pass through the filter 8 and participate in the production of compound fertilizer, thereby improving the utilization rate of raw materials. At the same time, the elimination of large-particle raw materials occurs inside the connecting pipe 3, which does not affect the normal supply of raw materials, but improves the continuity of compound fertilizer production, reduces equipment downtime, and ensures production efficiency.

[0040] See also Figure 1~Figure 2 、 Figure 9 The storage bin 2 is connected to the connecting pipe 3 through a circulation channel 15, and a high-frequency vibration generator 16 is installed on the circulation channel 15. The high-frequency vibration generator 16 extends into the interior of the circulation channel 15 and forms an annular channel 17 between the circulation channel 15 and the inner wall of the circulation channel 15.

[0041] During the rotation of the nozzle 4, the raw materials can be sucked. During this process, the raw materials in the storage bin 2 can enter the inside of the connecting pipe 3 from the circulation channel 15 under the action of the above-mentioned suction force and its own gravity. When the raw materials enter the circulation channel 15, they can enter the annular channel 17. At this time, the high-frequency vibration generator 16 acts synchronously to burst the bubbles in the raw materials. In the process of bubble bursting, it also has the effect of breaking large particles of raw materials, which can refine the raw materials to a certain extent, improve the stability and uniformity of the raw materials during injection, and ensure the structural strength of the compound fertilizer particles.

[0042] Furthermore, since the raw material passes through the annular channel 17, the raw material can be in uniform contact with the high-frequency vibration generator, thereby achieving more uniform elimination of bubbles in the raw material.

[0043] It should be noted that the high-frequency vibration generator 16 can also be equivalently replaced by an ultrasonic cavitation device, which can use ultrasonic waves to break bubbles in the raw material.

[0044] See also Figures 1 to 4 The connecting pipe 3 is rotatably connected to the nozzle 4, a second gear 7 is fixedly mounted on the nozzle 4, a driving motor 5 is fixedly mounted on the outside of the connecting pipe 3, and a first gear 6 meshing with the second gear 7 is fixedly mounted on the output shaft of the driving motor 5; The nozzle 4 is provided with a spray hole 401 on the side wall, and a plurality of baffles 402 are also provided on the nozzle 4 at equal intervals in a circle, and the upper ends of the baffles 402 are connected to inclined plates 403; When the raw material enters the nozzle head 4 , the nozzle head 4 can drive the raw material to rotate so as to throw the raw material out from the nozzle hole 401 .

[0045] During use, the drive motor 5 works. At this time, the drive motor 5 drives the nozzle 4 to rotate through the cooperation of the first gear 6 and the second gear 7. At the same time, the baffle 402 will also rotate. At this time, when the raw material enters the interior of the nozzle 4, it can rotate under the action of the baffle 402 and generate centrifugal force. Under the action of centrifugal force, the raw material can be ejected from the nozzle hole 401 to make a parabolic motion inside the tower and exchange heat with the cold air rising in the tower to form compound fertilizer raw materials.

[0046] Among them, since the baffle 402 is provided with an inclined plate 403, when the inclined plate 403 rotates, it can play the role of an impeller, so that the material can be pressurized into the interior of the nozzle 4, that is, the ejection of the raw material is the joint action of the inclined plate 403 and the centrifugal force. Compared with the existing method of ejecting using centrifugal force, when this application is used, the nozzle 4 does not need to rotate at a good speed to ensure the injection pressure, thereby reducing the rotation speed of the nozzle 4, reducing the load of the drive motor 5 and the wear between the equipment parts.

[0047] As an embodiment of the present invention, a method for granulating using the high-tower compound fertilizer production granulator is also proposed, comprising the following steps: Step 1: Mix and heat the raw materials of compound fertilizer and then pour them into storage bin 2; Step 2: Start the drive motor 5 to drive the nozzle 4 to rotate. The raw materials enter the annular channel 17 under the action of gravity to eliminate bubbles. Then, when entering the nozzle 4, they rotate with the nozzle 4 and are thrown out under the action of centrifugal force. They interact with the cold air rising in the tower to form compound fertilizer particles with a certain strength. Step 3: When the driving motor 5 is started, the reflux mechanism starts to operate synchronously, so that the raw materials can circulate in the connecting pipe 3 and the large particles of raw materials screened by the filter 8 are drained onto the partition 11; Step 4: The push mechanism is activated to squeeze the large particles of raw material on the partition 11, causing them to flow out from the other side of the extrusion hole 1101 and circulate into the connecting pipe 3; Step 5: Reset the push structure and repeat step 4.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0049] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A granulator for producing high-tower compound fertilizer, comprising: A material storage bin (2), a connecting pipe (3) and a nozzle (4), wherein the mixed slurry placed in the material storage bin (2) can enter the nozzle (4) through the connecting pipe (3) and be sprayed out; It is characterized by further comprising: A filter (8) is fixedly installed in the connecting pipe (3), and a reflux structure is provided on the filter (8); A partition (11) is arranged inside the reflux structure, and a plurality of groups of extrusion holes (1101) are equidistantly arranged on the partition (11). The reflux structure can pump the large-particle raw materials screened by the filter (8) onto the partition (11); A pushing structure is provided on the connecting pipe (3), and the pushing structure can move toward the partition (11) to squeeze the large-particle raw material on the partition (11), and during the extrusion process, the ejector pin (1201) provided on the pushing structure can penetrate the extrusion hole (1101).

2. A granulator for producing high-tower compound fertilizer according to claim 1, characterized in that, The filter (8) is a conical shell structure, and a plurality of groups of filter holes (801) are provided on the side wall of the filter (8), wherein the axis direction of the filter holes (801) is perpendicular to the edge line of the cross section of the filter (8).

3. A granulator for producing high-tower compound fertilizer according to claim 2, characterized in that, The aperture of the extrusion hole (1101) is smaller than the aperture of the filtering hole (801).

4. A granulator for producing high-tower compound fertilizer according to claim 1, characterized in that, The reflux structure comprises a reflux pipe (9) integrally formed with the filter (8), the upper end of the reflux pipe (9) being connected to a reflux pump device (10) arranged outside the connecting pipe (3) via a conduit, and the liquid outlet of the reflux pump device (10) being connected to the connecting pipe (3); The other end of the return pipe (9) is provided with a return hole (901), and the lower end of the return hole (901) is flush with the inner lower end of the filter (8); The partition (11) is arranged inside the return pipe (9).

5. A granulator for producing high-tower compound fertilizer according to claim 4, characterized in that, The pushing structure comprises a pushing piece (12) that penetrates the filter (8) and is slidably fitted with the inner wall of the return pipe (9), and the pushing piece (12) is provided with the ejector pin (1201); The pushing structure further comprises an electric telescopic rod (14) fixedly mounted on the side wall of the connecting tube (3), the electric telescopic rod (14) being connected to a sleeve member (13) sealingly and slidingly arranged on the outer wall of the connecting tube (3), a slide groove (301) being arranged on the connecting tube (3), a connecting plate (1301) fixed on the sleeve member (13) passing through the slide groove (301) and being able to slide relative to the length direction of the slide groove (301), and an end of the connecting plate (1301) away from the sleeve member (13) being fixed to the pushing member (12); When the sleeve member (13) slides on the connecting pipe (3), the sleeve member (13) always maintains a shielding state for the sliding groove (301).

6. A granulator for producing high-tower compound fertilizer according to claim 1, characterized in that: The storage bin (2) is connected to the connecting pipe (3) via a circulation channel (15). A high-frequency vibration generator (16) is installed on the circulation channel (15). The high-frequency vibration generator (16) extends into the interior of the circulation channel (15) and forms an annular channel (17) with the inner wall of the circulation channel (15).

7. A granulator for producing high-tower compound fertilizer according to claim 1, characterized in that: The connecting pipe (3) is rotatably connected to the nozzle (4); a second gear (7) is fixedly mounted on the nozzle (4); a driving motor (5) is fixedly mounted on the outside of the connecting pipe (3); and a first gear (6) meshing with the second gear (7) is fixedly mounted on the output shaft of the driving motor (5); A spray hole (401) is provided on the side wall of the spray head (4).

8. A granulator for producing high-tower compound fertilizer according to claim 7, characterized in that: The nozzle (4) is also provided with a plurality of baffles (402) at equal intervals in a circumferential manner, and the upper ends of the baffles (402) are connected to inclined plates (403); When the raw material enters the nozzle (4), the nozzle (4) can drive the raw material to rotate so as to throw the raw material out from the nozzle hole (401).

9. A method for granulating using the granulator for high-tower compound fertilizer production according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Mix and heat the raw materials of the compound fertilizer and then pour them into the storage bin (2); Step 2: Start the driving motor (5) to drive the nozzle (4) to rotate. The raw material enters the annular channel (17) under the action of gravity to eliminate bubbles. Then, when entering the nozzle (4), it rotates with the nozzle (4) and is thrown out under the action of centrifugal force, and interacts with the cold air rising in the tower to form compound fertilizer particles of a certain strength. Step 3: When the driving motor (5) is started, the reflux structure is operated synchronously, so that the raw materials can circulate in the connecting pipe (3) and the large particles of raw materials screened by the filter (8) are drained onto the partition (11); Step 4: The pushing structure is activated to squeeze the large particles of raw material on the partition (11), causing them to flow out from the other side of the extrusion hole (1101) and circulate into the interior of the connecting pipe (3); Step 5: Reset the push structure and repeat step 4.

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