A rotary drum granulator for compound fertilizer processing

Abstract

This invention relates to the field of fertilizer granulation processing technology, and discloses a rotary drum granulator for compound fertilizer processing, comprising a base plate, a rotary drum body disposed on the top of the base plate, and a control mechanism disposed on the rotary drum body. The control mechanism includes a shelf plate fixedly connected to the top of the base plate, and the rotary drum body disposed inside the shelf plate. Through the design of the control mechanism, after the compound fertilizer raw materials are fed into the rotary drum body for granulation processing, during this process, the rotary drum body can be controlled to swing around the axis of rotation by controlling the winding of one side's feeding roller and the synchronous feeding of the other side's feeding roller. This adjusts the tilt angle of the openings at both ends of the rotary drum body, thereby controlling the lateral movement of the raw materials inside the rotary drum body. This allows for the regulation of the granulation rolling time, ensuring that the material is fully granulated before discharge, effectively improving the yield rate during granulation.

Description

Technical Field

[0001] This invention relates to the field of fertilizer granulation processing technology, and in particular to a rotary drum granulator for compound fertilizer processing. Background Technology

[0002] Rotary drum granulators are suitable for cold and hot granulation and large-scale production of high, medium and low concentration compound fertilizers. During processing, the base fertilizer is moistened in the drum by water or steam and then undergoes a full chemical reaction. Under liquid phase conditions, the rotation of the drum causes the material particles to agglomerate into spheres by extrusion pressure.

[0003] Patent publication number CN223351603U discloses a multi-stage rotary drum granulator, including a base with a hollow bottom; a protective shell, which is located on the upper part of the base and fixedly connected to the base, with a feed inlet fixedly connected to one end of the protective shell; and a granulation component, which is located inside the protective shell and is used for granulation and screening simultaneously. The granulation component includes a mounting frame, a connecting pipe, and a rotary drum. The mounting frame is symmetrically arranged on the protective shell and fixedly connected to it. After granulation, the fertilizer is driven by an auger to move towards the second discharge port. Small-sized fertilizers fall through the holes on the rotary drum to the opening of the protective shell and are discharged through the first discharge port. Large-sized fertilizers are driven by the auger and discharged from the second discharge port. This avoids secondary screening of waste particles using screening machinery, thereby reducing production steps and lowering production costs.

[0004] The above-mentioned devices use an auger inside the drum to convey and discharge the granulated fertilizer during rotary drum granulation. This method of discharge, due to the addition of the auger compared to traditional equipment, can obstruct fertilizer granulation during the drum's rotation. For example, the auger can cause material particles to pile up and break due to compression during conveying. Existing rotary drum granulators typically have an internal inclined arc to allow downward movement to the outlet for discharge during granulation. However, a fixed inclined arc makes it impossible to effectively control the granulation process, resulting in direct discharge during the granulation rolling process and hindering control over the granulation yield. Therefore, this paper proposes a rotary drum granulator for compound fertilizer processing to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a rotary drum granulator for compound fertilizer processing.

[0006] The present invention provides a rotary drum granulator for compound fertilizer processing, which adopts the following technical solution: A rotary drum granulator for compound fertilizer processing includes a base plate, a rotary drum body is provided on the top of the base plate, and a control mechanism is provided on the rotary drum body; The control mechanism includes a shelf plate fixedly connected to the top of a base plate. A drum body is disposed inside the shelf plate. L-shaped frames are fixedly connected to both the front and rear sides of the shelf plate. Movable plates are disposed on both the front and rear sides of the drum body, extending into the L-shaped frames and slidably connected to them. A ring plate is rotatably connected to the outside of the drum body, connected to the two movable plates via rotating shafts. Two mounting plates are rotatably connected to the outside of the drum body, with rotating rods rotatably connected to the mounting plates. Two feeding rollers are disposed at the top of the shelf plate, with two pull ropes wound around them. One end of each pull rope is fixedly connected to the rotating rod. A first gear is fixedly connected to the outside of the feeding rollers. Two movable plates are slidably connected to the top of the shelf plate, with racks fixedly connected to the top of each movable plate. The two racks mesh with the two first gears respectively. An oscillation assembly is provided on the inner side of the shelf panel. The oscillation assembly includes a frame plate, which is fixedly connected to the top of the inner side of the shelf panel. A horizontal plate is integrally formed between two movable plates. An insertion hole is provided on the horizontal plate. A lifting plate is slidably connected inside the frame plate. An insertion plate is provided on one side of the lifting plate. The insertion plate matches the insertion hole. A first electric push rod is fixedly connected inside the frame plate. One end of the first electric push rod is fixedly connected to the lifting plate. A second electric push rod is fixedly connected to one side of the insertion plate. One end of the second electric push rod is fixedly connected to one side of the lifting plate.

[0007] By adopting the above technical solution, after the compound fertilizer raw materials are fed into the drum body, they are granulated. During this period, by controlling the winding of the winding roller on one side and the synchronous winding of the winding roller on the other side, the drum body can be controlled to swing around the axis of rotation. This adjusts the tilt angle of the openings at both ends of the drum body, thereby controlling the lateral movement of the raw materials inside the drum body. This allows for the regulation of the granulation rolling time, ensuring that the material is fully granulated before discharge, effectively improving the yield rate during granulation.

[0008] Preferably, an auxiliary plate is integrally formed on the top of the shelf, and a second electric push rod is fixedly connected to the auxiliary plate. One end of the second electric push rod is fixedly connected to one side of one of the movable plates, and a connecting plate is integrally formed between the two movable plates.

[0009] By adopting the above technical solution, the second electric push rod can control the moving plate by pushing and pulling after it is in operation.

[0010] Preferably, four guide cylinders are fixedly connected to the top wall of the shed, and four pull ropes pass through the four guide cylinders respectively.

[0011] By adopting the above technical solution, the guide cylinder guides the pull rope.

[0012] Preferably, a transmission rod is rotatably connected between the two mounting plates, and a motor is fixedly connected to one side of one of the mounting plates. The motor is fixedly connected to one end of the transmission rod through an output shaft. Two gear rings are fixedly connected to the outside of the drum body, and the two gear rings are respectively disposed on the inner side of the two mounting plates.

[0013] By adopting the above technical solution, the motor drives the transmission rod to rotate after it starts working.

[0014] Preferably, the transmission rod is externally fixedly connected to two second gears, which are respectively disposed on the top of the two gear rings and mesh with the two gear rings respectively.

[0015] By adopting the above technical solution, the second gear rotates and drives the gear ring to rotate.

[0016] Preferably, a vertical plate is fixedly connected to the top of the base plate, and an auxiliary component is provided inside the drum body. The auxiliary component includes a spray pipe, which is located inside the drum body and extends out of the drum body. A positioning plate is fixedly connected to one side of each of the two mounting plates. The spray pipe passes through the two positioning plates and is fixedly connected to the positioning plates. A feeding hopper is fixedly connected to the front side of one of the positioning plates, and the feeding hopper extends into the drum body. A box is fixedly connected to one side of the other positioning plate.

[0017] By adopting the above technical solution, the spray pipe can spray water to regulate the humidity inside the drum body.

[0018] Preferably, an exhaust frame is fixedly connected to the top of the spray pipe, an air supply pipe is fixedly connected to one end of the exhaust frame, one end of the air supply pipe is fixedly connected to the housing, and a fan is fixedly connected inside the housing.

[0019] By adopting the above technical solution, the airflow discharged from the exhaust frame can clean the inner wall of the drum cylinder.

[0020] Preferably, an external connecting pipe is fixedly connected to the vertical plate, and a flexible hose is fixedly connected between the external connecting pipe and the spray pipe.

[0021] By adopting the above technical solution, the external pipe is used to connect to external water supply equipment.

[0022] Preferably, a screening assembly is provided at the bottom of one end of the drum body. The screening assembly includes a screening frame, an inclined screen plate is fixedly connected inside the screening frame, a square plate is fixedly connected to the top of the bottom plate, and a third electric push rod is fixedly connected to the square plate. One end of the third electric push rod is fixedly connected to the rear side of the screening frame.

[0023] By adopting the above technical solution, the third electric push rod can push and pull the screening frame back and forth after it is working.

[0024] Preferably, a door panel is provided on one side wall of the screening frame, the door panel is connected to the screening frame by a hinge, and a discharge chute is provided on the screening frame, the discharge chute being located at the bottom of the inclined screen plate.

[0025] By adopting the above technical solution, the unqualified compound fertilizer particles are screened out and discharged through the discharge chute.

[0026] In summary, the present invention has the following beneficial technical effects: A rotary drum granulator for compound fertilizer processing, through the design of its control mechanism, allows the compound fertilizer raw materials to be fed into the rotary drum for granulation. During this process, by controlling the winding of the wire feeding roller on one side and the synchronous feeding of the wire feeding roller on the other side, the rotary drum can be controlled to swing around the axis of rotation. This adjusts the tilt angle of the openings at both ends of the rotary drum, thereby controlling the lateral movement of the raw materials inside the rotary drum. This allows for the regulation of the granulation rolling time, ensuring that the material is fully granulated before discharge, effectively improving the yield rate during granulation.

[0027] A rotary drum granulator for compound fertilizer processing addresses the issue of material waste caused by the conditioned compound fertilizer material adhering to the inner wall of the drum during granulation. This is achieved by briefly raising the drum and using the vibration generated by gravity to shake off the material adhering to the inside. Furthermore, airflow from the exhaust frame cleans the inner wall of the drum, combining these methods to effectively ensure the utilization rate of raw materials and reduce the need for manual cleaning due to material adhesion.

[0028] A rotary drum granulator for compound fertilizer processing, after the material inside the rotary drum is fully granulated, discharges the granulated compound fertilizer into an inclined screen plate in a screening frame. The inclined screen plate can screen the compound fertilizer granules. Material that does not meet the granulation requirements falls onto the bottom inclined surface of the screening frame after passing through the inclined screen plate and is eventually discharged through the discharge chute, while the compound fertilizer granules that meet the requirements remain on the inclined screen plate. This method of screening and separating the materials avoids the need for additional screening later, which would lead to complicated processes and improves processing efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the structure of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the image; Figure 4 This is a cross-sectional view of the box structure in this invention; Figure 5 for Figure 4 Enlarged view of point B in the image; Figure 6 This is a cross-sectional view of the spray pipe in this invention.

[0030] Explanation of reference numerals in the attached drawings: 1. Base plate; 2. Drum body; 3. Control mechanism; 31. Shelf plate; 32. L-shaped frame; 33. Movable plate; 34. Ring plate; 35. Mounting plate; 36. Rotating rod; 37. Feeding roller; 38. Pull rope; 39. First gear; 391. Moving plate; 392. Rack; 393. Auxiliary plate; 394. Guide cylinder; 395. Transmission rod; 396. Motor; 397. Gear ring; 398. Second gear; 4. Vibration assembly; 41 42. Horizontal plate; 43. Insertion hole; 44. Lifting plate; 45. Insertion plate; 46. First electric push rod; 47. Second electric push rod; 5. Vertical plate; 6. Auxiliary components; 61. Spray pipe; 62. Positioning plate; 63. Feed hopper; 64. Box body; 65. Exhaust frame; 66. Air supply pipe; 67. Fan; 68. External pipe; 7. Screening assembly; 71. Screening frame; 72. Inclined screen plate; 73. Third electric push rod; 74. Door panel; 75. Discharge chute. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 The present invention will be described in further detail below.

[0032] This invention discloses a rotary drum granulator for compound fertilizer processing. (See reference...) Figures 1-6 The system includes a base plate 1, a drum body 2 on the top of the base plate 1, a control mechanism 3 on the drum body 2, and a shelf plate 31 fixedly connected to the top of the base plate 1. The drum body 2 is located inside the shelf plate 31. L-shaped frames 32 are fixedly connected to both the front and rear sides of the shelf plate 31. Movable plates 33 are provided on both the front and rear sides of the drum body 2. The movable plates 33 extend into the interior of the L-shaped frames 32 and are slidably connected to the L-shaped frames 32. A ring plate 34 is rotatably connected to the outside of the drum body 2. The ring plate 34 is connected to two movable plates 33 through rotating shafts. Two mounting plates 35 are rotatably connected to the outside of the drum body 2. A rotating rod 36 is rotatably connected to the mounting plate 35. Two feeding rollers 37 are provided on the top of the shelf plate 31. Two pull ropes 38 are wound on the feeding rollers 37. One end of the pull ropes 38 is fixedly connected to the rotating rod 36. A first gear 39 is fixedly connected to the outside of the feeding rollers 37. Two movable plates 391 are slidably connected to the top of the shelf plate 31. A rack 392 is fixedly connected to the top of the movable plates 391. The two racks 392 mesh with the two first gears 39 respectively. An oscillation assembly 4 is provided inside the shelf panel 31. The oscillation assembly 4 includes a frame plate 41, which is fixedly connected to the top of the inner side of the shelf panel 31. A horizontal plate 42 is integrally formed between two movable plates 33. An insertion hole 43 is provided on the horizontal plate 42. A lifting plate 44 is slidably connected inside the frame plate 41. An insertion plate 45 is provided on one side of the lifting plate 44, and the insertion plate 45 matches the insertion hole 43. A first electric push rod 46 is fixedly connected inside the frame plate 41. One end of the first electric push rod 46 is fixedly connected to the lifting plate 44. A second electric push rod 47 is fixedly connected to one side wall of the insertion plate 45. One end of rod 47 is fixedly connected to one side of lifting plate 44. After the compound fertilizer raw material is put into the drum body 2, it is granulated. During this period, by controlling the winding of the wire feeding roller 37 on one side and the synchronous feeding of the wire feeding roller 37 on the other side, the drum body 2 can be controlled to swing around the axis of rotation. This adjusts the tilt angle of the openings at both ends of the drum body 2, thereby controlling the left and right lateral movement of the raw material inside the drum body 2. This allows for the control of the granulation rolling time, so that the material can be discharged only after sufficient granulation, effectively improving the yield rate during granulation.

[0033] An auxiliary plate 393 is integrally formed on the top of the canopy panel 31. A second electric push rod 47 is fixedly connected to the auxiliary plate 393. One end of the second electric push rod 47 is fixedly connected to one side of one of the movable plates 391. A connecting plate is integrally formed between the two movable plates 391. After the second electric push rod 47 is working, it can push and pull the movable plates 391. Four guide cylinders 394 are fixedly connected to the top wall of the canopy panel 31. Four pull ropes 38 pass through the four guide cylinders 394 respectively. The guide cylinders 394 guide the pull ropes 38. A transmission rod 395 is rotatably connected between two mounting plates 35. A motor 396 is fixedly connected to one side of one of the mounting plates 35. The motor 396 is fixedly connected to one end of the transmission rod 395 through an output shaft. Two gear rings 397 are fixedly connected to the outside of the drum body 2. The two gear rings 397 are respectively set inside the two mounting plates 35. After the motor 396 works, it drives the transmission rod 395 to rotate. Two second gears 398 are fixedly connected to the outside of the transmission rod 395. The two second gears 398 are respectively set on the top of the two gear rings 397, and the two second gears 398 mesh with the two gear rings 397 respectively. After the second gears 398 rotate, they drive the gear rings 397 to rotate.

[0034] A vertical plate 5 is fixedly connected to the top of the base plate 1. An auxiliary component 6 is installed inside the drum body 2. The auxiliary component 6 includes a spray pipe 61, which is located inside the drum body 2 and extends out of the drum body 2. A positioning plate 62 is fixedly connected to one side of each of the two mounting plates 35. The spray pipe 61 passes through the two positioning plates 62 and is fixedly connected to the positioning plates 62. A feeding hopper 63 is fixedly connected to the front side of one of the positioning plates 62 and extends into the drum body 2. The other positioning plate 62 is fixedly connected to one side of the vertical plate 62. The drum body 2 is equipped with a housing 64 and a spray pipe 61, which sprays water to regulate humidity inside the drum body 2. An exhaust frame 65 is fixedly connected to the top of the spray pipe 61, and an air supply pipe 66 is fixedly connected to one end of the exhaust frame 65. One end of the air supply pipe 66 is fixedly connected to the housing 64. A fan 67 is fixedly connected inside the housing 64. The airflow discharged from the exhaust frame 65 can clean the inner wall of the drum body 2. An external pipe 68 is fixedly connected to the vertical plate 5. A hose is fixedly connected between the external pipe 68 and the spray pipe 61. The external pipe 68 is used to connect to external water supply equipment.

[0035] A screening assembly 7 is provided at the bottom of one end of the drum body 2. The screening assembly 7 includes a screening frame 71. An inclined screen plate 72 is fixedly connected inside the screening frame 71. A square plate is fixedly connected to the top of the bottom plate 1. A third electric push rod 73 is fixedly connected to the square plate. One end of the third electric push rod 73 is fixedly connected to the rear side of the screening frame 71. After the third electric push rod 73 is working, it can push and pull the screening frame 71 back and forth. A door panel 74 is provided on one side wall of the screening frame 71. The door panel 74 is connected to the screening frame 71 by a hinge. A discharge chute 75 is opened on the screening frame 71. The discharge chute 75 is located at the bottom of the inclined screen plate 72. The compound fertilizer particles that do not meet the requirements are discharged through the discharge chute 75.

[0036] In actual operation, when this device is used, first connect the device to the power supply. The external pipe 68 is used to connect to the external water supply equipment (not shown in the diagram) for water supply. When working, the compound fertilizer raw materials are fed through the feeding hopper 63. After feeding, the material enters the drum body 2 through the feeding hopper 63. After the motor 396 works, it drives the transmission rod 395 to rotate. The transmission rod 395 drives the second gear 398 to rotate. The second gear 398 drives the gear ring 397 to rotate. The gear ring 397 drives the drum body 2 to rotate, thereby causing the raw materials to roll and granulate inside the drum body 2. During this period, water is sent to the spray pipe 61 through the cartilage and distributed through the spray pipe 61 to adjust the humidity of the material inside the drum body 2. In this device, after the second electric push rod 47 is working, it pushes the connected moving plate 391. This moving plate 391 drives the connecting plate to move, and the connecting plate drives another moving plate 391 to move synchronously. When the moving plate 391 moves, the rack 392 at its top drives the first gear 39 to rotate. The first gear 39 drives the feeding roller 37 to rotate. In this device, when the two feeding rollers 37 rotate, the directions of winding the pull rope 38 are opposite to each other. That is, when rotating in the same direction, one of them winds the pull rope 38, and the other feeding roller 37 feeds the pull rope 38. In this way, the drum body 2 can be controlled to swing left and right around the axis of rotation. When the opening on one side of the drum body 2 where the fan 67 is located is tilted downward, as the drum body 2 rotates continuously, the compound fertilizer material inside it is slowly discharged from this opening along the tilt angle during the granulation process for feeding. In addition to controlling the oscillation of the drum body 2 for feeding, the drum body 2 can also be controlled to shake, so that the compound fertilizer material inside can roll and granulate along with the rotation of the drum body 2, and can also shake inside along with the left and right swing of the drum body 2 to accelerate the granulation speed. During the granulation process, to prevent the conditioned compound fertilizer material from adhering to the inner wall of the drum body 2 and failing to peel off quickly, thus resulting in material waste, the second electric push rod 47 pushes the insert plate 45 after it moves into the insertion hole 43. Then, the first electric push rod 46 pulls the lifting plate 44 upward a short distance. According to the above connection, after the drum body 2 is slightly lifted upward, the insert plate 45 is controlled to leave the insertion hole 43. Under the influence of gravity, the drum body 2 falls quickly. When the drum body 2 falls, it drives the movable plate 33 to move downward. After the movable plate 33 moves to the maximum downward position in the L-shaped frame 32, it touches the bottom. At this time, the drum body 2 forms an oscillating force after touching the bottom. This oscillating force can shake off the material adhering to the inner wall of the drum body 2. In addition to the above-mentioned vibration cleaning of the attached material, after the blower 67 starts working, it blows the airflow into the exhaust frame 65 through the air supply pipe 66, and finally blows it out to the inner wall of the drum body 2 through the exhaust frame 65. This can effectively clean the inner wall of the drum body 2, thereby fully cleaning the attached material, ensuring the utilization rate of raw materials, and also reducing the troublesome situation of needing to manually clean the material afterward. Finally, after the material inside the drum body 2 is fully granulated, the drum body 2 is tilted downwards towards the screening frame 71. The granulated compound fertilizer is then discharged into the inclined screen plate 72 in the screening frame 71. The inclined screen plate 72 can screen the compound fertilizer particles. Materials that do not meet the granulation requirements fall onto the bottom inclined surface of the screening frame 71 after passing through the inclined screen plate 72 and are eventually discharged through the discharge chute 75. The compound fertilizer particles that meet the requirements remain on the inclined screen plate 72. After opening the door plate 74, the compound fertilizer particles on the inclined screen plate 72 can be discharged through the door plate 74. This method of screening and separating the materials avoids the need for additional screening later, which would lead to complicated processes and improves processing efficiency. During this period, in order to avoid clogging of the inclined screen plate 72 and increase the screening speed, the third electric push rod 73 pushes and pulls the screening frame 71 quickly over a short distance, which can make the screening frame 71 vibrate, thereby accelerating the falling and screening speed of the fertilizer particles.

[0037] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A rotary drum granulator for compound fertilizer processing, characterized by: Includes a base plate (1), a drum body (2) is provided on the top of the base plate (1), and a control mechanism (3) is provided on the drum body (2); The control mechanism (3) includes a shelf plate (31), which is fixedly connected to the top of the base plate (1). The drum body (2) is located inside the shelf plate (31). L-shaped frames (32) are fixedly connected to both the front and rear sides of the shelf plate (31). Movable plates (33) are provided on both the front and rear sides of the drum body (2). The movable plates (33) extend into the interior of the L-shaped frames (32) and are slidably connected to the L-shaped frames (32). A ring plate (34) is rotatably connected to the outside of the drum body (2). The ring plate (34) is connected to the two movable plates (33) respectively through a rotating shaft. The outside of the drum body (2) Two mounting plates (35) are rotatably connected, and a rotating rod (36) is rotatably connected to the mounting plate (35). Two wire feeding rollers (37) are provided on the top of the shelf (31). Two pull ropes (38) are wound on the wire feeding rollers (37). One end of the pull ropes (38) is fixedly connected to the rotating rod (36). A first gear (39) is fixedly connected to the outside of the wire feeding rollers (37). Two movable plates (391) are slidably connected to the top of the shelf (31). A rack (392) is fixedly connected to the top of the movable plate (391). The two racks (392) mesh with the two first gears (39) respectively. An oscillation assembly (4) is provided on the inner side of the shelf panel (31). The oscillation assembly (4) includes a frame plate (41). The frame plate (41) is fixedly connected to the top of the inner side of the shelf panel (31). A horizontal plate (42) is integrally formed between two movable plates (33). An insertion hole (43) is provided on the horizontal plate (42). A lifting plate (44) is slidably connected inside the frame plate (41). An insertion plate (45) is provided on one side of the lifting plate (44). The insertion plate (45) matches the insertion hole (43). A first electric push rod (46) is fixedly connected inside the frame plate (41). One end of the first electric push rod (46) is fixedly connected to the lifting plate (44). A second electric push rod (47) is fixedly connected to one side of the insertion plate (45). One end of the second electric push rod (47) is fixedly connected to one side of the lifting plate (44).

2. The rotary drum granulator for compound fertilizer processing according to claim 1, characterized in that: An auxiliary plate (393) is integrally formed on the top of the shelf (31). A second electric push rod (47) is fixedly connected to the auxiliary plate (393). One end of the second electric push rod (47) is fixedly connected to one side of one of the movable plates (391). A connecting plate is integrally formed between the two movable plates (391).

3. A rotary drum granulator for compound fertilizer processing according to claim 1, characterized in that: Four guide cylinders (394) are fixedly connected to the top wall of the canopy (31), and four pull ropes (38) pass through the four guide cylinders (394) respectively.

4. A rotary drum granulator for compound fertilizer processing according to claim 1, characterized in that: A transmission rod (395) is rotatably connected between the two mounting plates (35). A motor (396) is fixedly connected to one side of one of the mounting plates (35). The motor (396) is fixedly connected to one end of the transmission rod (395) through its output shaft. Two gear rings (397) are fixedly connected to the outside of the drum body (2). The two gear rings (397) are respectively set on the inner side of the two mounting plates (35).

5. A rotary drum granulator for compound fertilizer processing according to claim 4, characterized in that: The transmission rod (395) is externally fixedly connected to two second gears (398). The two second gears (398) are respectively located on the top of the two gear rings (397), and the two second gears (398) mesh with the two gear rings (397) respectively.

6. A rotary drum granulator for compound fertilizer processing according to claim 1, characterized in that: A vertical plate (5) is fixedly connected to the top of the base plate (1). An auxiliary component (6) is provided inside the drum body (2). The auxiliary component (6) includes a spray pipe (61). The spray pipe (61) is located inside the drum body (2) and extends out of the drum body (2). A positioning plate (62) is fixedly connected to one side of each of the two mounting plates (35). The spray pipe (61) passes through the two positioning plates (62) and is fixedly connected to the positioning plates (62). A feeding hopper (63) is fixedly connected to the front side of one of the positioning plates (62). The feeding hopper (63) extends into the drum body (2). A box (64) is fixedly connected to one side of the other positioning plate (62).

7. A rotary drum granulator for compound fertilizer processing according to claim 6, characterized in that: The top of the spray pipe (61) is fixedly connected to an exhaust frame (65), one end of the exhaust frame (65) is fixedly connected to an air supply pipe (66), one end of the air supply pipe (66) is fixedly connected to a housing (64), and a fan (67) is fixedly connected inside the housing (64).

8. A rotary drum granulator for compound fertilizer processing according to claim 6, characterized in that: An external pipe (68) is fixedly connected to the vertical plate (5), and a flexible hose is fixedly connected between the external pipe (68) and the spray pipe (61).

9. A rotary drum granulator for compound fertilizer processing according to claim 1, characterized in that: The bottom of one end of the drum body (2) is provided with a screening assembly (7). The screening assembly (7) includes a screening frame (71). An inclined screen plate (72) is fixedly connected inside the screening frame (71). A square plate is fixedly connected to the top of the bottom plate (1). A third electric push rod (73) is fixedly connected to the square plate. One end of the third electric push rod (73) is fixedly connected to the rear side of the screening frame (71).

10. A rotary drum granulator for compound fertilizer processing according to claim 9, characterized in that: A door panel (74) is provided on one side wall of the screening frame (71). The door panel (74) is connected to the screening frame (71) by a hinge. A discharge chute (75) is provided on the screening frame (71). The discharge chute (75) is located at the bottom of the inclined screen plate (72).

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