Anti-blocking controlled release fertilizer production granulating device

Abstract

The application discloses a kind of anti-clogging controlled-release fertilizer production granulating device, which belongs to the technical field of screen cleaning of granulator.It mainly includes base, and anti-clogging screening mechanism is fixedly connected on the base, the anti-clogging screening mechanism includes the outer shell body fixedly connected with the base, and the outer shell body mainly includes screening bin, a plurality of chutes are formed in the middle side wall of the screening bin, a hole is formed in the screening bin at the middle length direction middle position of the chute, the outer side is fixedly connected with the discharge port one, the side wall of the screening bin at the length direction both ends of the chute is formed with a hole, the hole outer side screening bin is fixedly connected with the inlet one and the inlet two respectively, the inlet one and the inlet two one end are fixedly connected with the conveying pipe, the conveying pipe upper side is fixedly connected with the discharge port two, the main shaft is installed in the outer shell body, and the rotating rod is fixedly connected in the middle of the main shaft.The application has the advantages of strong anti-clogging ability, high screening efficiency, smooth material backflow, convenient screen maintenance and strong adaptability to materials.

Description

Technical Field

[0001] This invention belongs to the field of granulator screen cleaning technology, and more specifically, it relates to an anti-clogging controlled-release fertilizer granulation device. Background Technology

[0002] Controlled-release fertilizer is a new type of fertilizer that slows down the release of nutrients through coating or chemical bonding. Its core production process includes batching, mixing, granulation, screening, drying, and coating. Among these, the screening process after granulation is a crucial step affecting the uniformity of product particles and the continuity of production. Currently, common controlled-release fertilizer screening devices after granulation are mostly fixed vibrating screens or drum screens, which have the following significant shortcomings: Screen holes are easily clogged: During the granulation process, controlled-release fertilizer particles are often easily stuck in the screen holes due to binders, damp raw materials, or irregular particle shapes, resulting in decreased screening efficiency. In severe cases, it may even require machine shutdown for screen cleaning. Screen cleaning is inconvenient: In traditional screening devices, the screen plates are fixed to the frame. When the screen holes are clogged, the entire machine needs to be disassembled for cleaning, which is time-consuming, labor-intensive, and results in long downtime, severely impacting production efficiency. Screening efficiency is low: Single-layer screening structures cannot simultaneously obtain products with multiple particle size distributions, requiring multiple devices connected in series, increasing equipment investment and floor space. Crushing and Dust Pollution: Some screening devices require forceful hammering during screen cleaning, which can easily cause screen deformation and generate a large amount of dust, which is detrimental to the workshop environment and the health of operators. Poor Material Return: After the undersize material (qualified granules) and the oversize material (large particles or clumps) are separated, the oversize material needs to be returned to the granulator for regranulation. In traditional devices, the oversize material often falls to the discharge port by gravity, frequently resulting in bridging and blockage. Therefore, a controlled-release fertilizer production granulation device is needed that can effectively prevent screen blockage, has strong continuous operation capability, high screening efficiency, and allows for smooth return of the oversize material. To address the above technical problems, this application proposes a solution. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a granulation device for controlled-release fertilizer production that is resistant to clogging, and has the advantages of strong anti-clogging ability, high screening efficiency, smooth material return, convenient screen plate maintenance and strong adaptability to materials.

[0004] The aforementioned anti-clogging controlled-release fertilizer granulation device includes a base, on which an anti-clogging screening mechanism is fixedly connected. The anti-clogging screening mechanism includes an outer shell fixedly connected to the base. The outer shell mainly includes a screening chamber. Multiple grooves are formed on the middle sidewall of the screening chamber. A hole is formed in the screening chamber at the middle position along the length of each groove, and a discharge port is fixedly connected to its outer side. Holes are formed on the sidewalls of the screening chambers at both ends along the length of the groove. A feed inlet and a feed outlet are fixedly connected to the outer side of the screening chambers, respectively. One end of each feed inlet is fixed together. The device is connected to a conveying pipe, with a discharge port fixedly connected to one side of the upper part of the conveying pipe. A main shaft is installed inside the outer casing, with a rotating rod fixedly connected to the middle of the main shaft. Multiple perforated rods are installed on the upper and lower sides of the rotating rod. Splined columns are fixedly connected to the main shaft at both ends of the rotating rod. A baffle is fixedly connected to the upper end of the upper splined column, and baffles are fixedly connected to both ends of the lower splined column. Two intersecting guide rods are fixedly connected to both ends of the main shaft. A central ring is fixedly connected to the middle of the screening chamber. Multiple empty tubes are fixedly connected at equal intervals to the upper and lower ends of the central ring. A central ring groove is opened in the middle of the inner wall of the central ring.

[0005] Preferably, a fixed ring is rotatably connected to the upper part of the main shaft, and the outer periphery of the fixed ring is fixedly connected to the inner side wall of the screening chamber. An upper vibrating screen is slidably connected to the outer periphery of the spline column at the upper part of the main shaft. The upper vibrating screen includes a screen plate, a plurality of screen holes are equally spaced on the screen plate, a central shaft hole is opened in the middle of the screen plate, a T-shaped ring is fixedly connected to the upper edge of the central shaft hole, a scraper ring is slidably connected to the T-shaped ring, a T-shaped groove that mates with the T-shaped ring is opened at the bottom of the scraper ring, a spline groove that slidably mates with the spline column is opened in the middle of the scraper ring, a helical toothed ring is fixedly connected to the upper part of the screen plate, the helical toothed ring abuts against the guide rod, a plurality of columns are fixedly connected to the lower edge of the screen plate, a spring is nested around the outer periphery of the column, one end of the spring abuts against the screen plate, the other end abuts against the upper part of the empty pipe, the column is slidably connected to the empty pipe, a plurality of insert plates that slidably connect to the slide groove are fixedly connected around the screen plate, and the screen plate is located on the lower side of the feed inlet.

[0006] Preferably, a lower vibrating screen is slidably connected to the periphery of the spline column at the lower part of the main shaft. The lower vibrating screen includes a screen plate II. A slide plate II is fixedly connected to the periphery of the screen plate II and slidably connected to the slide groove. Multiple screen holes II are equidistantly opened on the screen plate II. A T-shaped ring II is fixedly connected to the upper part of the middle hole of the screen plate II. A scraper ring is slidably connected to the T-shaped ring II. The spline groove on the scraper ring is slidably connected to the lower spline column. Multiple columns II are fixedly connected to the upper edge of the screen plate II. Springs are nested on the outer side of the columns II. One end of the spring abuts against the upper end face of the screen plate II, and the other end abuts against the lower empty tube of the central ring. A slanted tooth bottom ring is fixedly connected to the bottom edge of the screen plate II. The slanted tooth bottom ring abuts against the guide rod at the bottom of the main shaft. The screen plate II is located on the upper side of the feed inlet II.

[0007] Preferably, scrapers are fixedly connected to both sides of the scraper ring, the length of the scraper is less than the radius of the second sieve plate, and the first discharge port is located on the upper side of the second sieve plate.

[0008] Preferably, a spring baffle plate is fixedly connected to the bottom of the main shaft. The spring baffle plate is spiral-shaped and its bottom abuts against the bottom of the screening chamber. A bevel gear one is fixedly connected to the main shaft at the bottom of the spring baffle plate. A drive shaft is rotatably connected to the outer side of the bottom of the screening chamber. Bevel gear three is fixedly connected to both ends of the drive shaft, and bevel gear four is fixedly connected to the middle. Bevel gear one meshes with bevel gear three on one side for transmission. A drive device one is fixedly connected to one side of the bottom of the base. A bevel gear five is fixedly connected to the rotating end of the drive device one. Bevel gear five meshes with bevel gear four for transmission. A spiral riser is rotatably connected inside the conveying pipe. A bevel gear two is fixedly connected to the bottom of the spiral riser. Bevel gear two meshes with bevel gear three for transmission.

[0009] Preferably, the perforating rod is made of rubber, and a grooved top is installed at one end of the perforating rod.

[0010] Preferably, a granulation mechanism is installed on the base above the screening chamber, the outlet of the granulation mechanism is sealed to the opening at the top of the screening chamber, and the second discharge port is located directly above the opening at the top of the granulation mechanism.

[0011] Compared with the prior art, the beneficial effects of the present invention are: This invention has strong anti-clogging capabilities: the upper and lower vibrating screens make small axial reciprocating movements driven by the rotation of the main shaft, which, together with the rotating rod and the perforating rod, push out the material blocking the screen holes, preventing the screen holes from being clogged by sticky materials; when the scraper ring rotates with the main shaft, the scraper scrapes off the adhering material on the screen plate surface, further preventing the screen holes from being clogged by sticky materials. High screening efficiency: The upper and lower vibrating screens inside the screening chamber screen the material remaining at the top. Larger pieces are left on the upper vibrating screen, scraped by the scraper ring, and enter the conveying pipe through inlet one, then flow out through outlet two via a spiral riser for regranulation. Smaller pieces flow directly through the upper and lower vibrating screens to the bottom of the screening chamber, are swept into inlet two by spring baffles, and flow out through outlet two via a spiral riser for regranulation. Only the fuller particles fall onto the lower vibrating screen, where the scraper rings scrape the formed fertilizer granules out through outlet one. Smooth material return: The spiral structure of the spring baffles, combined with the spiral riser, guides the undersize material (powder) and oversize material (large particles) to outlet one or through the conveying pipe and spiral riser to the granulation mechanism, achieving continuous circulation with minimal or no waste. Compact structure and reliable transmission: Through multi-stage bevel gear transmission (bevel gear 1, bevel gear 3, bevel gear 4, bevel gear 5, and bevel gear 2), a single drive unit can simultaneously drive the main shaft and the spiral riser, resulting in a short transmission chain, high efficiency, and small footprint. Easy screen plate maintenance: Both the upper and lower vibrating screens can slide up and down along the splined column, and radial positioning and guidance are achieved through the cooperation of insert plate 1 / 2 and the sliding groove. When necessary, the vibrating screen can be easily pulled out along the main shaft direction for maintenance or replacement. Strong material adaptability: The perforated rod is made of rubber, and combined with the tearing action of the grooved top, it can effectively handle controlled-release fertilizer raw materials with high moisture content and severe agglomeration, expanding the applicable operating conditions of the device. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the external overall structure of the present invention; Figure 2 This is a cross-sectional view of the internal structure of the present invention; Figure 3 This is a schematic diagram of the anti-clogging screening structure of the present invention; Figure 4 This is an exploded view of the specific structure of the anti-clogging screening structure of the present invention; Figure 5 This is a schematic diagram of the specific structure of the upper vibrating screen; Figure 6 This is a schematic diagram of the cross-sectional structure of the upper vibrating screen; Figure 7 This is a cross-sectional view of the scraper ring. Figure 8This is a cross-sectional view of the central ring structure; Figure 9 A schematic diagram showing the specific structure of the central shaft and its auxiliary components; Figure 10 This is a schematic diagram of the specific structure of the perforated rod; Figure 11 A schematic diagram of the specific structure of the outer shell; Figure 12 This is a schematic diagram of the specific structure of the lower vibrating screen.

[0013] In the diagram, 1. Base; 2. Granulation mechanism; 3. Anti-clogging screening mechanism; 301. Main shaft; 3011. Guide rod; 3012. Baffle; 3013. Splined column; 3014. Bevel gear one; 302. Fixed ring; 303. Scraper ring; 3031. Spline groove; 3032. T-slot; 304. Upper vibrating screen; 3041. Helical toothed ring; 3042. Screen plate one; 3043. Screen hole one; 3044. Insert plate one; 3045. Central shaft hole one; 3046. Column one; 3047. T-slot ring one; 305. Perforated rod; 3051. Groove top; 306. Rotating rod; 307. Spring; 308. Central ring; 3081. Central ring groove; 3082. Empty pipe; 309. Lower vibrating screen; 3091. Insert plate II; 3092. Screen plate II; 3093. Screen hole II; 3094. Column II; 3085. T-ring II; 3096. Helical tooth bottom ring; 310. Spring baffle plate; 311. Spiral riser; 3111. Bevel gear II; 312. Drive shaft; 3121. Bevel gear III; 3122. Bevel gear IV; 313. Drive device I; 3131. Bevel gear V; 314. Outer casing; 3141. Conveying pipe; 3142. Feed inlet I; 3143. Screening bin; 31431. Slide chute; 3144. Feed inlet II; 3145. Discharge outlet I; 3146. Discharge outlet II. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings: The directional terms used in the detailed description paragraphs are only for the convenience of those skilled in the art to understand the technical solutions described in this application based on the visual orientation shown in the accompanying drawings. Unless otherwise explicitly specified and limited, the terms "setting," "installing," "connecting," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0015] like Figures 1 to 12As shown, a clogging-resistant controlled-release fertilizer granulation device includes a base 1, on which an anti-clogging screening mechanism 3 and a granulation mechanism 2 are fixedly connected. The anti-clogging screening mechanism 3 includes an outer shell 314 fixedly connected to the base 1. The outer shell 314 includes a cylindrical screening chamber 3143. Multiple strip-shaped grooves 31431 are equidistantly spaced along the circumferential direction on the side wall of the middle position of the screening chamber 3143. The grooves 31431 are used for the upper vibrating screen 304 and the lower vibrating screen 309 to slide back and forth along the axial direction. A hole communicating with the outside is opened on the screening chamber 3143 in the middle length direction of the groove 31431. A discharge port 3145 is fixedly connected to the screening chamber 3143 outside the hole. Holes connecting to the outside are respectively opened on the side walls of the screening chambers 3143 at both ends of the chute 31431 along its length. Feed inlet 1 3142 and feed inlet 2 3144 are fixedly connected to the screening chambers 3143 outside the two holes respectively. The ends of feed inlet 1 3142 and feed inlet 2 3144 away from the screening chambers 3143 are connected to the lower part of the same vertical conveying pipe 3141. A horizontal discharge port 2 3146 is fixedly connected to one side of the upper part of the conveying pipe 3141. The outlet end of discharge port 2 3146 faces the upper opening of the granulation mechanism 2.

[0016] like Figure 4 As shown, a vertical main shaft 301 is axially mounted inside the outer casing 314. A horizontal rotating rod 306 is fixedly connected to the middle of the main shaft 301. Multiple perforated rods 305 are radially evenly distributed on the main shaft 301 on both the upper and lower sides of the rotating rod 306. When the rotating rod 306 and the perforated rods 305 rotate with the main shaft 301, they extrude material from the blocked screen holes on the screen plate. Splined columns 3013 are fixedly connected to the main shaft 301 at both the upper and lower ends of the rotating rod 306. A baffle 3012 is fixedly connected to the upper end of the upper splined column 3013, and baffles 3012 are fixedly connected to both the upper and lower ends of the lower splined column 3013. The baffles 3012 are used to limit the axial position of the upper and lower vibrating screens on the splined columns 3013. Two cross-shaped guide rods 3011 are fixedly connected to the upper and lower ends of the main shaft 301. When the guide rods 3011 rotate with the main shaft 301, they actuate the helical tooth ring 3041 and the helical tooth bottom ring 3096, driving the upper and lower vibrating screens to make small axial reciprocating motions.

[0017] It is worth noting that the two scraper rings 303 and the upper and lower sets of perforated rods 305 are arranged in a cross pattern to prevent the perforated rods 305 from coming into contact with the scraper rings 303 when cleaning the screen holes, thus preventing damage to the perforated rods 305.

[0018] A central ring 308 is fixedly connected to the middle position inside the screening chamber 3143, such as... Figure 8As shown, multiple vertical hollow tubes 3082 are fixedly connected at equal intervals along the circumference of the upper and lower end faces of the central ring 308. The hollow tubes 3082 serve as supports for the spring 307 and also provide sliding guides for the first column 3046 and the second column 3094. A ring-shaped groove 3081 is formed along the circumference at the middle position of the inner wall of the central ring 308. The function of the central ring groove 3081 is to allow the rotating rod 306 to rotate.

[0019] A retaining ring 302 is rotatably connected to the upper part of the main shaft 301. The outer circumference of the retaining ring 302 is fixedly connected to the inner wall of the screening chamber 3143. The retaining ring 302 is used to position the main shaft 301 at the center of the screening chamber 3143 and bear the radial load of the main shaft 301. An upper vibrating screen 304 is slidably connected to the periphery of the spline column 3013 at the upper part of the main shaft 301.

[0020] like Figure 5 As shown, the upper vibrating screen 304 includes a circular screen plate 3042. Multiple screen holes 3043 are equidistantly spaced along the circumference of the screen plate 3042, used for screening particles. A central shaft hole 3045 is provided at the center of the screen plate 3042, through which a splined column 3013 passes. A T-ring 3047 is fixedly connected to the upper edge of the central shaft hole 3045. An annular scraper ring 303 is slidably connected above the T-ring 3047. The bottom of the scraper ring 303 has a T-groove 3032 that mates with the T-ring 3047, allowing the scraper ring 303 to rotate freely around the main shaft 301 on the T-ring 3047. A spline groove 3031 is provided at the center of the scraper ring 303. The spline groove 3031 is slidably connected to the upper spline column 3013, so that the scraper ring 303 can both rotate with the main shaft 301 and float axially along the spline column 3013. A helical toothed ring 3041 is fixedly connected to the edge of the upper end face of the screen plate 3042. The tooth surface of the helical toothed ring 3041 abuts against the guide rod 3011 at the upper end of the main shaft 301. When the guide rod 3011 rotates, it pushes the upper vibrating screen 304 to make a small up-and-down reciprocating motion through the helical toothed ring 3041. Multiple columns 3046 are fixedly connected circumferentially at equal intervals along the lower edge of the screen plate 3042. Springs 307 are fitted around each column 3046. The top of the springs 307 abuts against the lower edge of the screen plate 3042, and the bottom of the springs 307 abuts against the top of the hollow tube 3082 on the upper surface of the central ring 308. The lower ends of the columns 3046 are inserted into and slidably connected to the hollow tube 3082. The springs 307 provide elastic support and restoring force for the upper vibrating screen 304. Multiple insert plates 3044 are fixedly connected circumferentially at equal intervals along the outer circumference of the screen plate 3042. The insert plates 3044 are inserted into corresponding grooves 31431 on the side wall of the screening chamber 3143. The cooperation between the insert plates 3044 and the grooves 31431 restricts the rotational freedom of the upper vibrating screen 304 while allowing it to slide axially. Screen plate 3042 is located directly below feed inlet 3142.

[0021] The splined column 3013 at the lower part of the main shaft 301 is also slidably connected to the lower vibrating screen 309. For example... Figure 12 As shown, the lower vibrating screen 309 includes a circular screen plate 3092. Multiple insert plates 3091 are fixedly connected at equal intervals along the circumference of the screen plate 3092. The insert plates 3091 are inserted into corresponding grooves 31431 on the side wall of the screening chamber 3143. The cooperation between the insert plates 3091 and the grooves 31431 restricts the rotational freedom of the lower vibrating screen 309 while allowing it to slide axially. Multiple screen holes 3093 are equally spaced along the circumference of the screen plate 3092 for screening particles. A T-shaped ring 3085 is fixedly connected to the upper edge of the hole at the center of the screen plate 3092. A scraper ring 303 is slidably connected above the T-shaped ring 3085. The spline groove 3031 on the scraper ring 303 is slidably connected to the lower spline column 3013, so that the scraper ring 303 can rotate with the main shaft 301 and float axially along the spline column 3013. Multiple columns 3094 are fixedly connected circumferentially at equal intervals along the upper edge of the screen plate 3092. A spring 307 is sleeved on the outside of the column 3094. The top of the spring 307 abuts against the upper surface of the screen plate 3092, and the bottom of the spring 307 abuts against the top of the empty tube 3082 on the lower surface of the central ring 308. The lower end of the column 3094 is inserted into the empty tube 3082 and slidably connected thereto. The spring 307 provides elastic support and restoring force for the lower vibrating screen 309. A helical toothed bottom ring 3096 is fixedly connected to the lower edge of the screen plate 3092. The toothed surface of the helical toothed bottom ring 3096 abuts against the guide rod 3011 at the lower end of the main shaft 301. When the guide rod 3011 rotates, it pushes the vibrating screen 309 to make a small up-and-down reciprocating motion through the helical toothed bottom ring 3096. The screen plate 3092 is located directly above the feed inlet 3144.

[0022] Scrapers are radially fixed to both sides of the scraper ring 303 on the upper vibrating screen 304 and the lower vibrating screen 309. The length of the scraper is less than the radius of screen plate 3042 or screen plate 3092. When the scraper rotates with the main shaft 301, it scrapes off the material adhering to the screen plate surface. The discharge port 3145 is located on the upper side of the lower vibrating screen 309 and mainly collects the fertilizer granules formed on the lower vibrating screen 309.

[0023] A spring baffle plate 310 is fixedly connected to the bottom of the main shaft 301. The spring baffle plate 310 is spiral-shaped, and its outer edge abuts against the inner wall of the bottom of the screening chamber 3143. The spring baffle plate 310 acts as a scraper to prevent material from accumulating at the bottom of the chamber, and its spiral structure guides the powdery material to the feed inlet 3144, transporting the material to the conveying pipe 3141. A bevel gear 3014 is fixedly connected to the main shaft 301 at the bottom of the spring baffle plate 310. A horizontal drive shaft 312 is rotatably connected to the outer bottom of the screening chamber 3143. Bevel gears 3121 are fixedly connected to both ends of the drive shaft 312, and a bevel gear 3122 is fixedly connected to the middle of the drive shaft 312. The bevel gear 3014 meshes with one of the bevel gears 3121 on one side for transmission. A drive unit 313 (such as a motor) is fixedly connected to one side of the bottom of the base 1. A bevel gear 3131 is fixedly connected to the rotating end of the drive unit 313. The bevel gear 3131 meshes with the bevel gear 3122 for transmission. A spiral riser 311 is rotatably connected inside the conveying pipe 3141. A bevel gear 3111 is fixedly connected to the bottom of the spiral riser 311. The bevel gear 3111 meshes with the bevel gear 3121 on the other side for transmission.

[0024] The perforating rod 305 is made of rubber. During operation, the rubber perforating rod 305 can effectively push out the material in the screen holes while avoiding hard damage to the screen plate and particles. One end of the perforating rod 305 is equipped with a grooved top head 3051, and the groove of the grooved top head 3051 facilitates the ejection of material.

[0025] A granulation mechanism 2 is installed on the base 1 at the top of the screening chamber 3143. The outlet of the granulation mechanism 2 is sealed to the upper opening of the screening chamber 3143. The granulated material from the granulation mechanism 2 falls directly into the screening chamber 3143 for screening. The discharge port 2 3146 is located directly above the upper opening of the granulation mechanism 2. After the unqualified large particles or agglomerated material produced by the granulation mechanism 2 is discharged from the discharge port 2 3146, it can be returned to the granulation mechanism 2 for secondary granulation through an external pipe.

[0026] Working process: In this invention, fertilizer granules and unformed materials produced by the granulation mechanism 2 are fed together into the anti-clogging screening mechanism 3. The drive device 313 is started, the main shaft 301 rotates, and the guide rod 3011 contacts the inclined toothed ring 3041 on the upper vibrating screen 304 and the inclined toothed bottom ring 3096 on the lower vibrating screen 309, respectively, causing the upper vibrating screen 304 and the lower vibrating screen 309 to vibrate up and down reciprocally. During the reciprocating vibration, the perforated rod 305 cleans the first screen hole 3043 and the second screen hole 3093. Large, unformed pieces of material remain on the upper vibrating screen 304. After being processed by the scraper ring 303, they enter the conveying pipe 3141 through the feed inlet 3142. Smaller pieces of material pass through screen holes 3043 and 3093, falling to the bottom of the screening bin 3143. A spring baffle plate 310 sweeps the smaller pieces through the feed inlet 3144 into the conveying pipe 3141. The spiral riser 311 then transfers all the large and small pieces of material to the discharge outlet 3146, from where they are released into the granulation mechanism 2 for re-granulation. Only fertilizer granules falling onto the lower vibrating screen 309 are swept into the discharge outlet 3145 by the scraper ring 303 on the screen plate 3092 for packaging.

[0027] Finally, although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for 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 embodiments that can be understood by those skilled in the art.

Claims

1. A granulation device for controlled-release fertilizer production that prevents clogging, comprising a base (1), wherein an anti-clogging screening mechanism (3) is fixedly connected to the base (1), characterized in that: The anti-clogging screening mechanism (3) includes an outer shell (314) fixedly connected to the base. The outer shell (314) mainly includes a screening chamber (3143). Multiple sliding grooves (31431) are provided on the middle side wall of the screening chamber (3143). A hole is provided on the screening chamber (3143) at the middle position of the middle length direction of the sliding groove (31431), and a discharge port (3145) is fixedly connected to the outside. Holes are provided on the side walls of the screening chambers (3143) at both ends of the length direction of the sliding groove (31431). A feed inlet (3142) and a feed inlet (3144) are fixedly connected to the screening chambers (3143) outside the holes, respectively. A conveying pipe (3141) is fixedly connected to one end of the feed inlet (3142) and the feed inlet (3144). A discharge port (3145) is fixedly connected to one side of the upper part of the conveying pipe (3141). 46), a main shaft (301) is installed inside the outer shell (314). A rotating rod (306) is fixedly connected in the middle of the main shaft (301). Multiple perforated rods (305) are installed on the upper and lower sides of the rotating rod (306). Splined columns (3013) are fixedly connected on the main shaft (301) at both ends of the rotating rod (306). A baffle (3012) is fixedly connected to the upper end of the upper splined column (3013). A baffle (3012) is fixedly connected to both ends of the lower splined column (3013). Two intersecting guide rods (3011) are fixedly connected to both ends of the main shaft (301). A central ring (308) is fixedly connected in the middle of the screening chamber (3143). Multiple empty tubes (3082) are fixedly connected at equal intervals at the upper and lower ends of the central ring (308). A central ring groove (3081) is opened in the middle of the inner wall of the central ring (308).

2. The anti-clogging controlled-release fertilizer granulation device according to claim 1, characterized in that: A fixed ring (302) is rotatably connected to the upper part of the main shaft (301). The outer periphery of the fixed ring (302) is fixedly connected to the inner wall of the screening chamber (3143). An upper vibrating screen (304) is slidably connected to the outer periphery of the spline column (3013) at the upper part of the main shaft (301). The upper vibrating screen (304) includes a screen plate (3042). A plurality of screen holes (3043) are equally spaced on the screen plate (3042). A central shaft hole (3045) is opened in the middle of the screen plate (3042). A T-shaped ring (3047) is fixedly connected to the upper edge of the central shaft hole (3045). A scraper ring (303) is slidably connected to the T-shaped ring (3047). A T-shaped groove (3032) that mates with the T-shaped ring (3047) is opened at the bottom of the scraper ring (303). A spline groove (3031) is provided in the middle to slide and connect with the spline column (3013). A helical toothed ring (3041) is fixedly connected to the upper part of the screen plate (3042). The helical toothed ring (3041) abuts against the guide rod (3011). Multiple columns (3046) are fixedly connected to the lower edge of the screen plate (3042). A spring (307) is nested around the column (3046). One end of the spring (307) abuts against the screen plate (3042), and the other end abuts against the upper part of the empty tube (3082). The column (3046) is slidably connected to the empty tube (3082). Multiple insert plates (3044) are fixedly connected around the screen plate (3042) and slidably connected to the slide groove (30413). The screen plate (3042) is located on the lower side of the feed inlet (3142).

3. The anti-clogging controlled-release fertilizer granulation device according to claim 1, characterized in that: A lower vibrating screen (309) is slidably connected to the periphery of the spline column (3013) at the lower part of the main shaft (301). The lower vibrating screen (309) includes a screen plate (3092). A slide plate (3091) that is slidably connected to the slide groove (31431) is fixedly connected around the screen plate (3092). A plurality of screen holes (3093) are equidistantly opened on the screen plate (3092). A T-shaped ring (3085) is fixedly connected around the upper part of the middle hole of the screen plate (3092). A scraper ring (303) is slidably connected on the T-shaped ring (3085). The spline groove (3031) on the scraper ring (303) is connected to the lower spline groove. The key column (3013) is slidably connected. Multiple columns (3094) are fixedly connected to the upper edge of the screen plate (3092). A spring (307) is nested on the outside of the column (3094). One end of the spring (307) abuts against the upper surface of the screen plate (3092), and the other end abuts against the lower empty tube (3082) of the central ring (308). A serrated bottom ring (3096) is fixedly connected to the bottom edge of the screen plate (3092). The serrated bottom ring (3096) abuts against the guide rod (3011) at the bottom of the main shaft (301). The screen plate (3092) is located on the upper side of the feed inlet (3144).

4. The anti-clogging controlled-release fertilizer granulation device according to claim 3, characterized in that: The scraper ring (303) is fixedly connected to scraper blades on both sides. The length of the scraper blades is less than the radius of the second sieve plate (3092). The first discharge port (3145) is located on the upper side of the second sieve plate (3092).

5. The anti-clogging controlled-release fertilizer granulation device according to claim 1, characterized in that: A spring baffle plate (310) is fixedly connected to the bottom of the main shaft (301). The spring baffle plate (310) is spiral-shaped and its bottom abuts against the bottom of the screening chamber (3143). A bevel gear one (3014) is fixedly connected to the main shaft (301) at the bottom of the spring baffle plate (310). A drive shaft (312) is rotatably connected to the outer side of the bottom of the screening chamber (3143). Bevel gear three (3121) is fixedly connected to both ends of the drive shaft (312), and bevel gear four (3122) is fixedly connected in the middle. The bevel gear one (3014) and the bevel gear on one side are connected to the bevel gear three (3121). The three wheels (3121) are meshed and connected. The base (1) is fixedly connected to one side of the bottom of the drive device (313). The rotating end of the drive device (313) is fixedly connected to the five bevel gears (3131). The five bevel gears (3131) are meshed and connected to the four bevel gears (3122). The conveying pipe (3141) is rotatably connected to the spiral riser (311). The bottom of the spiral riser (311) is fixedly connected to the two bevel gears (3111). The two bevel gears (3111) are meshed and connected to the three bevel gears (3121).

6. The anti-clogging controlled-release fertilizer granulation device according to claim 1, characterized in that: The perforated rod (305) is made of rubber, and a grooved top (3051) is installed at one end of the perforated rod (305).

7. The anti-clogging controlled-release fertilizer granulation device according to claim 1, characterized in that: A granulation mechanism (2) is installed on the base (1) at the top of the screening chamber (3143). The outlet of the granulation mechanism (2) is sealed to the opening at the top of the screening chamber (3143). The discharge port (3146) is located directly above the opening at the top of the granulation mechanism (2).

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