Compound fertilizer granulation production device

Abstract

This invention relates to the field of fertilizer production, specifically disclosing a compound fertilizer granulation production apparatus, including a conveyor shaft; a main motor driving the conveyor shaft to rotate; an extrusion conveyor cylinder; a grading and rounding unit; and a pressing and rounding unit. The grading and rounding unit includes a rounding cylinder and a multi-stage rounding assembly. The pressing and rounding unit includes a rotatable pressing and rounding shaft, which passes through the end of the rounding cylinder away from the extrusion conveyor cylinder and slides in contact with the inner wall of the rounding cylinder. The outer wall of the pressing and rounding shaft is provided with several spiral pressing and rounding grooves, the longitudinal cross-sectional profile of which increases progressively towards the end closer to the extrusion conveyor cylinder, with the end having the smallest longitudinal cross-sectional profile located outside the rounding cylinder. In this design, fertilizer granules form dynamic friction with the inner wall of the rounding cylinder and the pressing and rounding grooves, allowing the fertilizer granules to move stably along the pressing and rounding grooves and be compacted. The compacted compound fertilizer granules are less prone to loosening and pulverization, ensuring the quality of the compound fertilizer granules.

Description

Technical Field

[0001] This invention relates to the field of fertilizer production technology, and in particular to a compound fertilizer granulation production apparatus. Background Technology

[0002] The granulation process for compound fertilizers stems primarily from the dual requirements of agricultural application and physicochemical properties. Powdered or crystalline compound fertilizers are prone to absorbing moisture and clumping, have poor flowability, and easily generate dust during field application, leading to nutrient loss and environmental pollution. After granulation, granular fertilizers possess good compressive strength and particle uniformity, facilitating mechanized fertilization and enabling controlled nutrient release. By adjusting particle size, density, or coating processes, the nutrient dissolution rate can be slowed down, reducing leaching and volatilization losses, thereby improving fertilizer utilization.

[0003] When using rotary drum granulation or disc granulation, the requirements for the moisture content and cohesiveness of the raw materials are stringent. Because the inner walls of the drum and disc are smooth or have a few protrusions, the material relies on the friction and centrifugal force generated by the rotation of the drum to form a material curtain and cause thin-layer rolling agglomeration when it granulates. There is a lack of sufficient mechanical interlocking and compaction, which leads to low pelleting rate, insufficient particle strength, or excessively high return ratio in high nitrogen or high potassium formulations. Therefore, binders such as bentonite and polyacrylamide are added to improve the granulation performance. These additives dilute the effective nutrient content, and some non-degradable binders remain in the soil, causing secondary environmental risks. At the same time, because the compressive strength of the compound fertilizer particles formed after granulation is generally low, they are prone to pulverization during storage and transportation, causing urea or ammonium salt components to undergo condensation or decomposition reactions, producing substances such as biuret that are harmful to crop roots. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a compound fertilizer granulation production device to solve the problem that the compressive strength of the compound fertilizer granules formed after granulation is generally low, and they are prone to pulverization during storage and transportation, thus affecting their quality.

[0005] To achieve the above objectives, the basic solution of the present invention is as follows: A compound fertilizer granulation production apparatus, comprising a frame, and further comprising:

[0006] Conveyor shaft;

[0007] The main motor that drives the conveyor shaft to rotate is fixedly mounted on the frame;

[0008] The extrusion conveyor cylinder is fixedly installed on the frame;

[0009] Graded rounding unit;

[0010] The pressing and rolling unit, the extrusion conveying cylinder, the grading and rolling unit and the pressing and rolling unit are connected in sequence, and the end of the conveying shaft away from the main motor passes through the extrusion conveying cylinder and the grading and rolling unit in sequence and is opposite to the pressing and rolling unit;

[0011] The graded rounding unit includes:

[0012] A rolling cylinder, one end of which is coaxially and fixedly connected to the end of the extrusion conveyor cylinder away from the main motor;

[0013] Multi-stage rolling assembly, which is installed inside the rolling cylinder;

[0014] The pressing and rolling unit includes:

[0015] The pressure roller shaft passes through the end of the roller cylinder away from the extrusion conveyor cylinder and slides in contact with the inner wall of the roller cylinder. The outer wall of the pressure roller shaft is provided with several spiral pressure roller grooves. The longitudinal section profile of the pressure roller grooves increases sequentially towards the end closer to the extrusion conveyor cylinder, and the end with the smallest longitudinal section profile of the pressure roller groove is located outside the roller cylinder.

[0016] An auxiliary motor drives the roller shaft to rotate, and the auxiliary motor is fixedly connected to the end of the roller.

[0017] The technical principle of this invention is as follows: The main motor starts, driving the conveyor shaft to rotate. The conveyor shaft compresses the conveyor cylinder and the grading and rounding unit, providing power. When the material moves to the rounding cylinder, the multi-stage rounding assembly performs multiple efficient granulation processes to form fertilizer granules. When the fertilizer granules are conveyed to the tail of the rounding cylinder, the auxiliary motor drives the pressure roller shaft to rotate, facilitating the pressure roller shaft to scoop the fertilizer granules into the end of the pressure roller groove. The auxiliary motor drives the pressure roller shaft to rotate relative to the rounding cylinder, allowing the fertilizer granules to enter the pressure roller groove. The fertilizer granules are compacted into granules by the pressure roller groove, which gradually reduces the longitudinal profile of the granules. Dynamic friction is generated between the fertilizer granules and the inner wall of the rounding cylinder and the pressure roller groove, enabling the fertilizer granules to move stably and be compacted along the pressure roller groove. The rotational power of the pressure roller shaft is also converted into the power for the fertilizer granules to move along the pressure roller groove, ensuring stable compaction of the fertilizer granules. The compacted compound fertilizer granules are less prone to loosening and pulverization, thus ensuring the quality of the compound fertilizer granules.

[0018] Furthermore, a feed inlet is provided on the upper side of the end of the extrusion conveyor cylinder near the main motor, and a guide cylinder for material to enter is provided at the feed inlet of the extrusion conveyor cylinder.

[0019] The design of the feed inlet and guide cylinder makes material feeding convenient and efficient, and it is easier to cooperate with the extrusion conveyor cylinder to achieve high efficiency in fertilizer granulation.

[0020] Furthermore, the extrusion conveyor cylinder is equipped with helical blades, which are coaxially fixed in the middle of the conveyor shaft, with the end of the helical blades away from the main motor located at the end of the rolling cylinder.

[0021] With the above settings, the main motor starts, drives the conveyor shaft to rotate, and the conveyor shaft drives the spiral blades to rotate, conveying the material to be granulated through the guide cylinder to the extrusion conveyor cylinder. The conveying power of the conveyor shaft and the spiral blades can continuously act on the tail of the rolling cylinder, which can improve the compactness of the material during granulation and improve the density of the final fertilizer granules.

[0022] Furthermore, the multi-stage rounding assembly includes:

[0023] Several first rolling plates, each first rolling plate having several first rolling through grooves;

[0024] Several second rolling plates, each having several second rolling through grooves;

[0025] Several third rolling plates are provided with several third rolling through grooves, and the longitudinal section profiles of the first rolling through groove, the second rolling through groove and the third rolling through groove decrease in sequence.

[0026] The first, second, and third rolling plates are all coaxially and positioned inside the rolling cylinder in sequence, with the first rolling plate located on the side closest to the spiral blade. A stirring blade is provided on the side of the first, second, and third rolling plates closest to the main motor. The conveying shaft passes through the first and second rolling plates and is fixedly connected to the stirring blade.

[0027] With the above configuration, when the material is conveyed to the multi-stage spherical assembly, the material passes through the first spherical groove of the first spherical plate, the second spherical groove of the second spherical plate, and the third spherical groove of the third spherical plate under the pushing force of the spiral blades and the stirring action of the mixing disc. The first, second, and third spherical grooves, whose longitudinal cross-sectional profiles decrease sequentially, limit and cut the compacted material in sequence, so that the shape of the material changes with the first, second, and third spherical grooves, and thus becomes smaller in sequence. At the same time, the stirring action of the mixing disc can accelerate the material to pass through the first, second, and third spherical grooves, achieving rapid and efficient preliminary granulation of the material, and realizing multiple and multi-level preliminary granulation of the material.

[0028] Furthermore, the longitudinal section of the third round groove is circular.

[0029] The above settings ensure that the fertilizer particles that finally pass through the third roller groove are closer to spherical, making it easier for them to enter the pressure roller groove and for further pressure roller processing.

[0030] Furthermore, the corners of the inner walls of the first and second rounded grooves are rounded.

[0031] With the above settings, the edges and corners of the material are more rounded after passing through the first and second rounded grooves, making it easier to pass through densely; the material is also less likely to stick to the corners of the first and second rounded grooves.

[0032] Furthermore, it also includes a screening and collection unit, which comprises:

[0033] The screening box has an open top, and the open top is opposite to the end of the roller groove with the smallest longitudinal section profile.

[0034] Several screening rods are installed inside the screening box. The screening rods are arranged sequentially along the length of the screening box, and a screening gap is formed between two adjacent screening rods. The width of the screening gap is less than the minimum allowable width of the compound fertilizer particles. A material recovery chamber is formed between the screening rods and the bottom side of the screening box.

[0035] With the above setup, the compacted fertilizer granules fall from the end of the pressure roller groove into the screening box. The formed fertilizer granules move along the screening rods, while the fine fragments mixed in the fertilizer granules pass through the screening gaps between the screening rods and fall into the material recovery chamber, which can quickly screen fertilizer granules and powdery materials.

[0036] Furthermore, the screening rod is inclined, and the lowest end of the screening rod is positioned away from the main motor. The side wall of the screening box is provided with a discharge channel opposite to the lowest end of the screening rod.

[0037] With the above setup, the formed fertilizer granules move along the inclined direction of the screening rod to the outside of the discharge trough, which facilitates the rapid collection of the formed fertilizer granules and prevents them from accumulating on the screening rod, thus ensuring screening efficiency.

[0038] Furthermore, the screening and collection unit also includes:

[0039] The conveyor belt is arranged along the length of the discharge chute, and the upper side wall of the conveyor belt is in contact with and directly opposite the lowest end of the screening rod.

[0040] The conveyor baffle is located on the upper side of the conveyor belt, away from the screening rod.

[0041] With the above setup, fertilizer granules falling from the discharge chute can be directly moved onto the conveyor belt, which then transports the finished fertilizer granules, thus realizing the assembly line of fertilizer granule screening, conveying, and collection.

[0042] Furthermore, the bottom of the screening box is provided with a recovery port that communicates with the material recovery chamber. A recovery pipe is provided at the recovery port, and a recovery pump is connected to the recovery pipe. A connecting pipe connects the recovery pump and the guide cylinder.

[0043] With the above settings, the recovery pump is started to generate negative pressure to suck up and recover the fine materials in the material recovery chamber, so that the fine materials return to the guide cylinder after passing through the recovery pipe, recovery pump and connecting pipe, thus realizing the rapid recovery and granulation of fine materials. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of a compound fertilizer granulation production device in the axial direction according to an embodiment of the present invention.

[0045] Figure 2 This is an exploded view of the grading and rounding unit in a compound fertilizer granulation production device according to an embodiment of the present invention.

[0046] Figure 3 for Figure 1 Longitudinal sectional view of the extrusion conveyor cylinder, grading and rounding unit, pressing and rounding unit and screening and collecting unit.

[0047] In the above figures: frame 10, conveyor shaft 201, main motor 202, extrusion conveyor cylinder 30, guide cylinder 301, connecting pipe 302, spiral blade 303, rolling cylinder 40, multi-stage rolling assembly 401, first rolling plate 411, first rolling groove 421, second rolling plate 431, second rolling groove 441, third rolling plate 451, third rolling groove 461, protrusion 402, stirring blade 403, pressure rolling shaft 50, pressure rolling groove 501, auxiliary motor 502, connecting rod 503, screening box 60, discharge groove 601, recovery port 602, recovery pipe 603, conveyor belt 604, conveyor baffle 605, screening rod 606. Detailed Implementation

[0048] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0049] This embodiment is basically as follows: Figure 1 , Figure 2 and Figure 3 As shown in the figure, this embodiment of the invention proposes a compound fertilizer granulation production device, including a frame 10, a conveyor shaft 201, a main motor 202 that drives the conveyor shaft 201 to rotate, an extrusion conveyor cylinder 30, a grading and rounding unit, a pressing and rounding unit, and a screening and collecting unit. The main motor 202 is horizontally fixed to the right side of the frame 10 by bolts and nuts. A reducer is provided between the conveyor shaft 201 and the main motor 202, and the reducer is also horizontally fixed to the right side of the frame 10 by bolts and nuts. The extrusion conveyor cylinder 30 is horizontally fixed to the middle of the frame 10 by bolts and nuts. At the same time, the extrusion conveyor cylinder 30, the grading and rounding unit, and the pressing and rounding unit are connected in sequence, and the end of the conveyor shaft 201 away from the main motor 202 passes through the extrusion conveyor cylinder 30 and the grading and rounding unit in sequence and is opposite to the pressing and rounding unit.

[0050] like Figure 1 As shown, the extrusion conveyor cylinder 30 has a feed inlet on the upper side of one end near the main motor 202, and a guide cylinder 301 for material entry is provided at the feed inlet of the extrusion conveyor cylinder 30; Figure 3 As shown, the extrusion conveyor cylinder 30 is provided with a spiral blade 303. The spiral blade 303 is coaxially fixedly installed in the middle of the conveyor shaft 201, and the end of the spiral blade 303 away from the main motor 202 is located at the end of the rolling cylinder 40.

[0051] like Figure 2 and Figure 3 As shown, the graded rolling unit includes a rolling cylinder 40 and a multi-stage rolling assembly 401. The right end of the rolling cylinder 40 is coaxially arranged with the left end of the extrusion conveying cylinder 30 and is fixedly connected by bolts, nuts and flanges. The multi-stage rolling assembly 401 includes a set of first rolling plates 411, two sets of second rolling plates 431 and a set of third rolling plates 451. The first rolling plate 411 is provided with a plurality of first rolling grooves 421; the second rolling plate 431 is provided with a plurality of second rolling grooves 441; and the third rolling plate 451 is provided with a plurality of third rolling grooves 461. The longitudinal section profiles of the first rolling grooves 421, the second rolling grooves 441 and the third rolling grooves 461 decrease sequentially. The corners of the inner wall of 441 are rounded, and the longitudinal section of the third rolling groove 461 is circular. The first rolling plate 411, the second rolling plate 431 and the third rolling plate 451 are all coaxially and limitedly installed in the rolling cylinder 40. The side walls of the first rolling plate 411, the second rolling plate 431 and the third rolling plate 451 are provided with protrusions 402 that can be locked with the inner wall of the rolling cylinder 40. The first rolling plate 411 is located on the side close to the spiral blade 303. The first rolling plate 411, the second rolling plate 431 and the third rolling plate 451 are all provided with stirring blades 403 on the side close to the main motor 202. The conveying shaft 201 passes through the first rolling plate 411 and the second rolling plate 431 and is fixedly connected to the stirring blades 403.

[0052] like Figure 1 and Figure 3 As shown, the pressing and rolling unit includes a pressing and rolling shaft 50 and an auxiliary motor 502 that drives the pressing and rolling shaft 50 to rotate. The right end of the pressing and rolling shaft 50 passes through the left end of the rolling cylinder 40 and slides in contact with the inner wall of the rolling cylinder 40. The outer wall of the pressing and rolling shaft 50 is provided with a plurality of spiral pressing and rolling grooves 501. The longitudinal section profile of the pressing and rolling grooves 501 increases sequentially towards the end closer to the extrusion conveying cylinder 30. The end with the smallest longitudinal section profile of the pressing and rolling grooves 501 is located outside the rolling cylinder 40. The auxiliary motor 502 is fixedly connected to the end of the rolling cylinder 40 by an "L"-shaped connecting rod 503.

[0053] like Figure 1 and Figure 3 As shown, the screening and collection unit includes a screening box 60, a conveyor belt 604, a conveyor baffle 605, and several screening rods 606. The upper side of the screening box 60 is open, and the open side is opposite to the left end of the pressure roller groove 501. The screening rods 606 are all installed inside the screening box 60. The screening rods 606 are arranged sequentially and inclined along the length of the screening box 60, and a screening gap is formed between two adjacent screening rods 606. The width of the screening gap is smaller than the minimum width of the compound fertilizer particles. With a minimum allowable width, a material recovery chamber is formed between the screening rod 606 and the bottom side of the screening box 60; the lowest end of the screening rod 606 is located on the left side, and a discharge channel 601 is provided on the side wall of the screening box 60, which is opposite to the lowest end of the screening rod 606; at the same time, the conveyor belt 604 is arranged along the length direction of the discharge channel 601, and the upper side wall of the conveyor belt 604 is attached to and directly opposite the left end of the screening rod 606; the conveyor baffle 605 is located on the upper left side of the conveyor belt 604.

[0054] In addition, such as Figure 1 and Figure 3 As shown, the bottom of the screening box 60 is provided with a recovery port 602 that communicates with the material recovery chamber. A recovery pipe 603 is provided at the recovery port 602. The recovery pipe 603 is connected to a recovery pump. A connecting pipe 302 connects the recovery pump and the guide cylinder 301.

[0055] In this embodiment, when the compound fertilizer granulation production device is in use, the main motor 202 starts and drives the conveyor shaft 201 to rotate. The conveyor shaft 201 drives the spiral blades 303 and the mixing disc 403 to rotate, and the material to be granulated is conveyed to the extrusion conveyor cylinder 30 through the guide cylinder 301. At this time, under the action of the rotating spiral blades 303, the material can be quickly and initially extruded. At the same time, the material is conveyed to the rolling cylinder 40, realizing continuous granulation conveying and initial compaction of the material.

[0056] When the material is conveyed to the multi-stage spherical assembly 401, it passes through the first spherical groove 421 of the first spherical plate 411, the second spherical groove 441 of the second spherical plate 431, and the third spherical groove 461 of the third spherical plate 451 in sequence under the pushing force of the spiral blades 303 and the stirring action of the mixing disc 403. The first spherical groove 421, the second spherical groove 441, and the third spherical groove 461, whose longitudinal cross-sectional profiles decrease sequentially, limit and cut the compacted material in sequence, so that the shape of the material changes with the first spherical groove 421, the second spherical groove 441, and the third spherical groove 461, and thus becomes smaller in sequence, achieving the initial granulation treatment of the material. During this process, the stirring action of the mixing disc 403 can accelerate the material to pass through the first spherical groove 421, the second spherical groove 441, and the third spherical groove 461, achieving rapid and efficient initial granulation treatment of the material.

[0057] After the material passes through the third rounding groove 461, the fertilizer can be initially rounded and granulated. The fertilizer after initial rounding can re-enter the pressing groove 501 of the pressing roller shaft 50. At this time, the auxiliary motor 502 is in the starting state. The auxiliary motor 502 drives the pressing roller shaft 50 to rotate relative to the rolling cylinder 40. The fertilizer particles entering the pressing groove 501 are compacted into granules by the pressing groove 501, which has a longitudinal section profile that is successively reduced. The fertilizer particles form dynamic friction with the inner wall of the rolling cylinder 40 and the pressing groove 501, so that the fertilizer particles can move stably along the pressing groove 501 and be compacted. The rotational power of the pressing roller shaft 50 is also converted into the power for the fertilizer particles to move along the pressing groove 501, so that the fertilizer particles are stably compacted.

[0058] After being compacted, the fertilizer granules fall from the left end of the pressing roller groove 501 into the screening box 60. The screening rods 606 in the screening box 60 guide the granulated fertilizer granules, causing them to move along the inclined direction of the screening rods 606 onto the conveyor belt 604 outside the discharge trough 601. The conveyor belt 604 transports the finished fertilizer granules. Fine materials mixed in with the fertilizer granules fall through the screening gaps between the screening rods 606 into the material recovery chamber. The recovery pump is started to generate negative pressure to suck up and recover the fine materials in the material recovery chamber, so that the fine materials return to the guide cylinder 301 after passing through the recovery pipe 603, the recovery pump, and the connecting pipe 302, thus realizing the rapid recovery and granulation of the fine materials.

[0059] During the above process, the material is repeatedly compacted and shaped into granules by the spiral blades 303 and the multi-stage rolling assembly 401. When the fertilizer granules enter the rolling unit, the rotating rolling shaft 50 can cooperate with the rolling groove 501, allowing the rolling shaft 50 to drive the fertilizer granules to rotate while moving towards the end of the rolling groove 501 with a smaller longitudinal section profile, thereby achieving rolling compaction of the fertilizer granules and preventing the fertilizer granules from becoming loose and pulverized.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A compound fertilizer granulation production apparatus, comprising a frame, characterized in that, Also includes: Conveyor shaft; A main motor that drives the conveyor shaft to rotate is fixedly mounted on the frame; An extrusion conveyor cylinder, which is fixedly installed on the frame; Graded rounding unit; The extrusion conveying cylinder, the grading rolling unit and the pressure rolling unit are sequentially connected and arranged, and the end of the conveying shaft away from the main motor passes through the extrusion conveying cylinder and the grading rolling unit in sequence and is opposite to the pressure rolling unit; The graded rounding unit includes: A rolling cylinder, one end of which is coaxially and fixedly connected to the end of the extrusion conveyor cylinder away from the main motor; A multi-stage rounding assembly, wherein the multi-stage rounding assembly is installed inside a rounding cylinder; The pressing and rolling unit includes: The pressure roller shaft passes through the end of the roller cylinder away from the extrusion conveyor cylinder and slides in contact with the inner wall of the roller cylinder. The outer wall of the pressure roller shaft is provided with a number of spiral pressure roller grooves. The longitudinal section profile of the pressure roller grooves increases sequentially towards the end closer to the extrusion conveyor cylinder, and the end with the smallest longitudinal section profile of the pressure roller groove is located outside the roller cylinder. An auxiliary motor drives the roller shaft to rotate, and the auxiliary motor is fixedly connected to the end of the roller.

2. The compound fertilizer granulation production device as described in claim 1, characterized in that, The extrusion conveyor cylinder has a feed inlet on the upper side of one end near the main motor, and a guide cylinder for material entry is provided at the feed inlet of the extrusion conveyor cylinder.

3. The compound fertilizer granulation production device as described in claim 2, characterized in that, The extrusion conveyor cylinder is equipped with a spiral blade, which is coaxially fixedly installed in the middle of the conveyor shaft, with the end of the spiral blade away from the main motor located at the end of the rolling cylinder.

4. The compound fertilizer granulation production device as described in claim 3, characterized in that, The multi-stage rounding assembly includes: A plurality of first rolling plates, wherein the first rolling plates are provided with a plurality of first rolling through grooves; A plurality of second rolling plates, wherein the second rolling plates are provided with a plurality of second rolling through grooves; A plurality of third rolling plates, wherein the third rolling plates are provided with a plurality of third rolling through grooves, wherein the longitudinal cross-sectional profiles of the first rolling through groove, the second rolling through groove and the third rolling through groove decrease sequentially; The first, second, and third rolling plates are all coaxially and positioned inside the rolling cylinder in sequence, with the first rolling plate located on the side closest to the spiral blade. A stirring blade is provided on the side of the first, second, and third rolling plates closest to the main motor. The conveying shaft passes through the first and second rolling plates and is fixedly connected to the stirring blade.

5. The compound fertilizer granulation production device as described in claim 4, characterized in that, The longitudinal section of the third rounded through groove is circular.

6. The compound fertilizer granulation production device as described in claim 5, characterized in that, The corners of the inner walls of the first and second rounded through grooves are rounded.

7. A compound fertilizer granulation production apparatus as described in any one of claims 2-6, characterized in that, It also includes a screening and collection unit, which comprises: The screening box has an open top, and the open top is opposite to the end of the roller groove with the smallest longitudinal section profile. Several screening rods are installed inside a screening box. The screening rods are arranged sequentially along the length of the screening box, and a screening gap is formed between two adjacent screening rods. The width of the screening gap is less than the minimum allowable width of the compound fertilizer particles. A material recovery chamber is formed between the screening rods and the bottom side of the screening box.

8. The compound fertilizer granulation production apparatus as described in claim 7, characterized in that, The screening rod is inclined, with its lowest end facing away from the main motor. The side wall of the screening box is provided with a discharge channel opposite to the lowest end of the screening rod.

9. A compound fertilizer granulation production apparatus as described in claim 8, characterized in that, The screening and collection unit further includes: The conveyor belt is arranged along the length of the discharge chute, and the upper side wall of the conveyor belt is in contact with and directly opposite the lowest end of the screening rod. A conveyor baffle is located on the upper side of the conveyor belt away from the screening rod.

10. A compound fertilizer granulation production apparatus as described in claim 9, characterized in that, The bottom of the screening box is provided with a recovery port that communicates with the material recovery chamber. A recovery pipe is provided at the recovery port, and a recovery pump is connected to the recovery pipe. A connecting pipe connects the recovery pump and the guide cylinder.

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