Preparation process of mixed eutrophic fertilizer

Abstract

The invention relates to the technical field of fertilizer preparation, in particular to a preparation process of a mixed enriched fertilizer, which comprises the following steps: mixing fertilizers; performing granulation; performing drying; performing screening; cooling is performed; and packaging and storing. Screening equipment involved in the screening step comprises a filtering bin, a filtering sieve and a portal frame, the filtering sieve and the portal frame are fixedly mounted at the top of the filtering bin, a corrugated telescopic pipe is fixedly mounted at the bottom of a horizontal section of the portal frame, a spreading mechanism is mounted on the portal frame, and a pushing plate and a driving mechanism are slidably mounted in the filtering sieve. And a screening mechanism is mounted on the screening bin. The first left-right moving assembly drives the sliding base to move rightwards, so that the right end of the corrugated telescopic pipe moves from left to right to conduct dynamic spreading, the swing assembly drives the right end of the corrugated telescopic pipe to swing front and back, fertilizer is further evenly spread, and the screening effect on the fertilizer is improved. When the corrugated telescopic pipe moves leftwards, the pushing plate cleans fertilizer screened on the filter sieve rightwards.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizer production, in particular to a production process of mixed nutrient-rich fertilizer. Background Art

[0002] Mixed nutrient-rich fertilizer is a fertilizer prepared by mixing multiple nutrients. It can contain macroelements necessary for plant growth (such as nitrogen, phosphorus, and potassium), and can also contain medium elements (such as calcium, magnesium, sulfur) and trace elements (such as iron, manganese, zinc, copper, boron, molybdenum, etc.); the purpose of applying this kind of fertilizer is to provide plants with comprehensive and rich nutrition to meet the needs of plants at different growth stages; the production methods of mixed nutrient-rich fertilizers currently generally include granulation method and melting method, among which the most common is the granulation method. The steps of preparing mixed nutrient-rich fertilizers by the granulation method generally include fertilizer mixing, granulation, drying, screening, cooling, packaging and storage steps, among which screening is one of the most important steps. The screening step removes oversized and undersized fertilizer particles. Oversized fertilizer particles can be crushed and returned to the granulation process, and undersized fertilizer particles can be re-granulated.

[0003] At present, there are still the following deficiencies when using screening equipment to screen fertilizers: 1. When the filter screen is screening fertilizers, the fertilizers poured into the filter screen are easily piled up to form local concentrated screening, and local concentration is not conducive to fast and effective screening, which in turn affects the screening efficiency of the filter screen for fertilizers, and at the same time, it is not possible to maximize the effective utilization of the screening function of the filter screen; 2. When screening fertilizers, the fertilizers with unqualified particle sizes that are screened out will remain on the screen of the filter screen, which is easy to block and clog the screen of the filter screen, resulting in a reduction in the effective screening area of ​​the screen, further affecting the subsequent screening efficiency of fertilizers. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a process for preparing a mixed nutrient-enriched fertilizer, comprising the following steps:

[0005] S1. Fertilizer mixing: First, various basic fertilizers are added into the mixer according to a certain formula ratio and mixed thoroughly.

[0006] S2. Granulation: The mixed fertilizer particles are granulated by a drum granulator or a disc granulator. During the granulation process, a binder is sprayed on the material to bind the fertilizer particles together to form fertilizer particles of uniform size.

[0007] S3. Drying: The fertilizer particles with uniform size after granulation are sent into the dryer, and the hot air fully contacts with the fertilizer particles to evaporate the water.

[0008] S4. Screening: The dried fertilizer particles are screened by screening equipment to remove oversized and undersized fertilizer particles.

[0009] S5. Cooling: The qualified fertilizer particles after screening are put into the cooler for cooling, so that their temperature is reduced to a suitable range.

[0010] S6. Packaging and storage: Packaging and storage of the cooled qualified fertilizer granules.

[0011] Among them, the screening equipment involved in the above-mentioned S4 step includes a screening bin and a filter screen and a gantry fixedly installed on the top of the screening bin, the horizontal section of the gantry is located directly above the filter screen, and a discharge port is opened on the right side of the filter screen, the bottom of the horizontal section of the gantry is fixedly installed with a corrugated telescopic tube, the right end of the corrugated telescopic tube is bent downward and extends into the filter screen and is located above the screen, the gantry is installed with a spreading mechanism for driving the corrugated telescopic tube to move and spread the material, the inside of the filter screen is installed with a push plate for scraping the upper end of the screen for sliding left and right, the inner wall of the filter screen is installed with a driving mechanism for driving the push plate to move left and right, and the screening bin is installed with a screening mechanism.

[0012] The material laying mechanism includes a slide seat which is installed at the bottom of the horizontal section of the gantry for sliding left and right, a left and right moving component which drives the slide seat to move left and right is installed on the gantry, the right end of the slide seat is rotatably connected to a rocker arm, the bottom end of the rocker arm is rotatably connected to a round rod, the round rod is fixedly connected to the right side of the corrugated telescopic tube, and a swinging component which drives the rocker arm to swing left and right is installed on the slide seat.

[0013] The driving mechanism includes a left-right moving component 2 installed on the front and rear inner walls of the filter screen and used to drive the push plate to move left and right, and a guide component that guides the push plate to move up and down. The left-right moving component 2 corresponds to the guide component one by one.

[0014] In a possible embodiment, the left-right moving component includes a slide groove opened in the horizontal section of the gantry, a lead screw is rotatably installed inside the slide groove, a slider is externally threadedly connected to the lead screw, the bottom of the slider is fixedly connected to the top of the slide seat, and a drive motor for driving the lead screw to rotate is fixedly installed on the left side of the gantry.

[0015] In a possible embodiment, the swing assembly includes a rotating shaft 1 rotatably mounted at the bottom of the slide, the right end of the rotating shaft 1 is fixedly connected to a turntable 1, the right edge of the turntable 1 is fixedly connected to a push rod 1, the swing arm is provided with a through slot 1, the push rod 1 is slidably mounted inside the through slot 1, a rotating shaft 2 is rotatably mounted on the slide, the bottom end of the rotating shaft 2 is transmission-connected to the left end of the rotating shaft 1 through a bevel gear set, the top of the rotating shaft 2 is fixedly connected to a driving gear, the bottom of the horizontal section of the gantry is fixedly connected to a rack, and the driving gear is meshed with the rack.

[0016] In a possible embodiment, the left-right moving component 2 includes a screw 2 rotatably installed between the left and right side walls of the filter screen, the external thread of the screw 2 is connected to a slider 2, a vertical groove is opened inside the slider 2, the front and rear ends of the push plate are slidably connected up and down in the corresponding vertical grooves, the right ends of the front and rear screws 2 rotate to pass through the right side of the filter screen and are connected through a pulley assembly, and the right end of the front screw 2 and the screw 1 are also connected through a pulley assembly, and limit slot frames are installed on the front and rear inner walls of the filter screen, and the slider 2 is slidably installed at the bottom of the limit slot frame.

[0017] In a possible embodiment, the guide assembly includes a right-angled trapezoidal groove opened on the inner wall of the filter screen, the long bottom side of the right-angled trapezoidal groove is located below the short bottom side and the hypotenuse is located to the right of the vertical side, a wedge block is fixedly installed at the connection between the long bottom side and the hypotenuse of the right-angled trapezoidal groove, the left side of the wedge block is an inclined surface and the inclined surface gradually inclines from left to right toward the center of the filter screen, a guide block is slidably installed on one end of the push plate close to the right-angled trapezoidal groove, and the end of the guide block away from the push plate is slidably installed in the right-angled trapezoidal groove, and a return spring is fixedly connected between the end of the guide block close to the push plate and the inner wall of the push plate.

[0018] In a possible embodiment, the top of the screening bin is connected to the bottom of the filter screen, the left side of the screening bin is provided with discharge port 2 and discharge port 4 from top to bottom, the right side of the screening bin is provided with discharge port 3 located below discharge port 4, and the bottom of the screening bin is provided with discharge port 5.

[0019] In a possible embodiment, the screening mechanism includes a guide plate 1 rotatably installed between the front and rear inner walls of the screening bin, the guide plate 1 is located below the right half of the filter screen and the right end is in conflict with the right inner wall of the discharge port 2, the screening bin is internally slidably installed with a screening component 1 and a screening component 2, the screening component 1 and the screening component 2 are arranged left and right, the screening component 2 is located below the screening component 1, the screening bin is internally rotatably connected with a shaft rod 1 and a shaft rod 2, the shaft rod 1 is fixedly connected to the right end of the guide plate 1, and the shaft rod 2 is located below the screening component 1. A material guide plate three is fixedly connected to the outside of the lower part of the screening component one, and the right end of the material guide plate three is located above the screening component two. A material guide plate four is fixedly connected to the inside of the screening bin and is located below the screening component two. The right end of the material guide plate four is tilted downward and contacts the inner wall on the left side of the discharge port three. A scraper is installed on the top of the material guide plate four for sliding back and forth. A forward and backward moving component for driving the screening components one and two to move back and forth is installed on the front side of the screening bin, and an adjusting component for driving the shaft rod one and the shaft rod two to rotate is installed on the rear side of the screening bin.

[0020] In a possible embodiment, the screening component one includes a support frame slidably installed inside a screening bin, a plurality of elastic telescopic rods distributed in a rectangular shape are fixedly installed on the top of the support frame, a screening mesh frame is commonly fixedly connected to the tops of the plurality of elastic telescopic rods, a screening mesh is detachably installed on the top of the screening mesh frame, a material baffle plate symmetrically arranged front to back about the screening mesh is fixedly connected to the top of the screening mesh frame, and the screening component two has the same structure as the screening component one, and the bottom of the support frame in the screening component two is fixedly connected to the scraper by a hinge.

[0021] In a possible embodiment, the forward and backward moving component includes a push-pull rod slidably installed on the front side of the screening bin, the upper and lower ends of the push-pull rod are respectively fixedly connected to the corresponding support frames in the screening component one and the screening component two through a rotatably connected rotating rod, a driving motor two is fixedly installed on the front side of the screening bin, a turntable two is fixedly connected to the right side of the output shaft of the driving motor two, a push rod two is fixedly connected to the edge of the right side of the turntable two, a through slot two is opened inside the push-pull rod, the push rod two is slidably installed inside the through slot two, and a rotating motor for driving the corresponding rotating rod to rotate is respectively installed on the upper and lower ends of the push-pull rod.

[0022] In a possible embodiment, the adjustment assembly includes a drive motor three fixedly installed on the rear side of the screening bin, the output shaft of the drive motor three is fixedly connected to the shaft rod two, the rear end of the shaft rod one rotates and passes through the rear of the screening bin, and the drive motor three is connected to the shaft rod one through a pulley assembly.

[0023] Beneficial effects of the present invention: 1. The present invention drives the slide to move to the right through the left-right moving component, so that the right end of the corrugated telescopic tube moves from left to right to dynamically spread the material. When the slide moves to the right, the rack drives the driving gear to rotate, so that the swing component drives the right end of the corrugated telescopic tube to swing back and forth, further making the fertilizer evenly spread and improving the screening effect of the fertilizer. In the process of the multi-directional movement of the right end of the corrugated telescopic tube to implement dynamic and uniform spreading of the material, the right end of the corrugated telescopic tube continuously strikes the inner wall of the filter screen to make the filter screen vibrate, further improving the screening effect of the filter screen.

[0024] 2. In the present invention, when the right end of the corrugated telescopic tube moves to the left, the lead screw 1 drives the lead screw 2 to rotate synchronously through the belt, so that the slider 2 pushes the push plate to move to the right, and the push plate cleans the fertilizer screened on the filter screen to the right to avoid clogging the screen in the filter screen by the fertilizer, and when the push plate moves to the left, the guide assembly can guide the push plate to move the push plate upward and separate from the screen in the filter screen, preventing the fertilizer from being pushed to the left side of the filter screen and piling up, thereby helping to improve the screening effect and efficiency of the fertilizer.

[0025] 3. The present invention can adjust the inclination angle of the guide plate 1 and the guide plate 3 by adjusting the component, so that the screening mechanism can be switched between two different screening modes. When the screening mesh numbers of the screening nets in the screening component 1 and the screening component 2 are different, the screening component 1 and the screening component 2 can cooperate to perform three-stage screening on the fertilizer, thereby improving the degree of subdivision of the fertilizer according to the particle size. When the screening mesh numbers of the screening nets in the screening component 1 and the screening component 2 are the same, the screening component 1 and the screening component 2 can cooperate to perform component-based overall two-stage screening on the fertilizer, which is beneficial to improving the screening efficiency while ensuring the screening effect. Different screening modes improve the applicability of the equipment to screening fertilizers with different overall particle size differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a process flow chart of the present invention.

[0027] Figure 2 It is a schematic diagram of the three-dimensional structure from the first viewing angle of the present invention.

[0028] Figure 3 It is a schematic diagram of the stereoscopic structure from a second viewing angle of the present invention.

[0029] Figure 4 It is a front cross-sectional view of the present invention in the first screening mode.

[0030] Figure 5 It is a front cross-sectional view of the present invention in the second screening mode.

[0031] Figure 6 It is a right side cross-sectional view of the filter screen of the present invention.

[0032] Figure 7 It is a three-dimensional structural schematic diagram of the material spreading mechanism of the present invention.

[0033] Figure 8 yes Figure 7 Magnified view of area A.

[0034] Fig. 9 It is a three-dimensional structural schematic diagram of the swing assembly of the present invention.

[0035] Fig.10 It is a three-dimensional structural schematic diagram of the driving mechanism of the present invention.

[0036] Fig.11 It is a schematic diagram of the three-dimensional structure of the guide block of the present invention.

[0037] Fig.12 It is a three-dimensional structural schematic diagram of the forward and backward moving component of the present invention.

[0038] Fig.13 It is a schematic diagram of the three-dimensional structure of the turntable 2 of the present invention.

[0039] Fig.14 It is a cross-sectional view of the screening component 1 and the screening component 2 of the present invention in the discharging state.

[0040] Fig.15 yes Fig.10 Enlarged view of B.

[0041] In the figure: 1, filter screen; 11, gantry; 12, discharge port 1; 2, bellows telescopic tube; 3, material spreading mechanism; 31, slide seat; 32, left and right moving component 1; 321, slide slot; 322, lead screw 1; 323, slider 1; 324, drive motor 1; 33, rocker; 34, swing component; 341, rotating shaft 1; 342, turntable 1; 343, push rod 1; 344, through slot 1; 345, rotating shaft 2; 346, driving gear; 347, rack; 4, push plate; 5, driving mechanism; 51, left and right moving component 2; 511, lead screw 2; 512, slider 2; 513, vertical slot; 52, guide component; 521, right-angle trapezoidal slot; 522, wedge block ;523, guide block;524, reset spring one;53, limit slot frame;6, screening bin;61, discharge port two;62, discharge port three;63, discharge port four;64, discharge port five;7, screening mechanism;71, guide plate one;72, screening component one;721, support frame;722, elastic telescopic rod;723, screening mesh frame;73, baffle plate;74, guide plate three;75, screening component two;76, guide plate four;77, forward and backward moving component;771, push-pull rod;772, drive motor two;773, turntable two;774, push rod two;775, through slot two;776, rotating motor;78, adjustment component;781, drive motor three;79, scraper. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0043] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 A process for preparing a mixed nutrient-enriched fertilizer comprises the following steps:

[0044] S1. Fertilizer mixing: First, add various basic fertilizers into the mixer according to a certain formula ratio and mix them thoroughly. The mixing process must ensure uniformity so that various nutrients can be evenly distributed in the fertilizer particles.

[0045] S2. Granulation: The mixed fertilizer particles are granulated by a drum granulator or a disc granulator. During the granulation process, a binder is sprayed on the material. The common binder is bentonite. The fertilizer particles are bonded together by the binder to form fertilizer particles of uniform size.

[0046] S3. Drying: The fertilizer particles of uniform size after granulation are sent into the dryer. The hot air is fully in contact with the fertilizer particles to evaporate the water. The drying temperature is generally controlled within an appropriate range to avoid nutrient loss in the fertilizer or particle breakage.

[0047] S4. Screening: The dried fertilizer particles are screened by screening equipment to remove oversized and undersized fertilizer particles. Oversized fertilizer particles can be crushed and returned to the granulation process, while undersized fertilizer particles can be directly re-granulated.

[0048] S5. Cooling: The qualified fertilizer particles after screening are put into the cooler for cooling, so that their temperature is reduced to a suitable range.

[0049] S6. Packaging and storage: Packaging and storage of the cooled qualified fertilizer granules.

[0050] Among them, the screening equipment involved in the above-mentioned S4 step includes a screening bin 6 and a filter screen 1 and a gantry 11 fixedly installed on the top of the screening bin 6. The horizontal section of the gantry 11 is located directly above the filter screen 1. A discharge port 12 with a bottom edge flush with the upper surface of the screen inside the filter screen 1 is opened on the right side of the filter screen 1. A corrugated telescopic tube 2 is fixedly installed at the bottom of the horizontal section of the gantry 11. The right end of the corrugated telescopic tube 2 is bent downward and extends into the filter screen 1 and is located above the screen. A spreading mechanism 3 for driving the corrugated telescopic tube 2 to move and spread the material is installed on the gantry 11. A pushing plate 4 for scraping the upper end of the screen is installed inside the filter screen 1 for sliding left and right. A driving mechanism 5 for driving the pushing plate 4 to move left and right is installed on the inner wall of the filter screen 1. A screening mechanism 7 is installed on the screening bin 6.

[0051] See also Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The material spreading mechanism 3 includes a slide seat 31 which is installed at the bottom of the horizontal section of the gantry 11 for sliding left and right. The bellows telescopic tube 2 is located below the slide seat 31 and is fixedly connected thereto. A left and right moving component 32 for driving the slide seat 31 to move left and right is installed on the gantry 11. A rocker arm 33 is rotatably connected to the right end of the slide seat 31. A round rod is rotatably connected to the bottom end of the rocker arm 33. The round rod is fixedly connected to the right side of the bellows telescopic tube 2. A swing component 34 for driving the rocker arm 33 to swing left and right is installed on the slide seat 31.

[0052] See also Figure 4 , Figure 6 and Fig.10 The driving mechanism 5 includes a left-right moving component 51 symmetrically installed on the front and rear inner walls of the filter screen 1 and used to drive the push plate 4 to move left and right, and a guide component 52 that guides the push plate 4 to move up and down. The left-right moving component 51 corresponds to the guide component 52 one by one.

[0053] See also Figure 4 and Figure 7 The left-right moving component 32 includes a slide groove 321 opened in the horizontal section of the gantry 11, a lead screw 322 is rotatably installed inside the slide groove 321, a slider 323 is externally threadedly connected to the lead screw 322, the bottom of the slider 323 is fixedly connected to the top of the slide seat 31, and a driving motor 324 for driving the lead screw 322 to rotate is fixedly installed on the left side of the gantry 11.

[0054] By driving the motor 324 to drive the lead screw 322 to rotate forward and reverse, the slider 323 can drive the slide seat 31 to move rightward and leftward, thereby driving the right end of the bellows 2 to move rightward or leftward, so that the bellows 2 is extended or shortened, which is convenient for the bellows 2 to transport fertilizer from left to right into the filter screen 1 and evenly lay the fertilizer on the internal screen of the filter screen 1.

[0055] See also Figure 7 , Figure 8 and Fig. 9 The swing assembly 34 includes a rotating shaft 341 rotatably mounted on the bottom of the slide 31, a turntable 342 is fixedly connected to the right end of the rotating shaft 341, a push rod 343 is fixedly connected to the edge of the right side of the turntable 342, a through slot 344 is provided on the swing rod 33, and the push rod 343 is slidably mounted inside the through slot 344, a rotating shaft 345 is rotatably mounted on the slide 31, the bottom end of the rotating shaft 345 is transmission-connected to the left end of the rotating shaft 341 through a bevel gear set, a driving gear 346 is fixedly connected to the top of the rotating shaft 345, and a rack 347 is fixedly connected to the bottom of the horizontal section of the gantry 11, and the driving gear 346 is meshed with the rack 347.

[0056] When the slide seat 31 moves left and right, the slide seat 31 will drive the rotating shaft 2 345 and the driving gear 346 to move left and right together, and the rack 347 will drive the driving gear 346 and the rotating shaft 2 345 to rotate, and then the rotating shaft 2 345 will drive the rotating shaft 1 341 and the rotating disk 1 342 to rotate through the bevel gear set, and the rotating disk 1 342 will drive the push rod 1 343 to rotate, and then the push rod 1 343 will drive the swing rod 33 to swing back and forth. During the swinging process of the swing rod 33, the push rod 1 343 will slide up and down inside the through groove 1 344, and drive the right end of the corrugated telescopic tube 2 to swing back and forth through the swing rod 33, so that the corrugated telescopic tube 2 can lay the fertilizer more evenly on the internal screen of the filter screen 1, thereby improving the screening effect. At the same time, the right end of the corrugated telescopic tube 2 will continuously knock on the inner wall of the filter screen 1 during the swinging process, so that the filter screen 1 will vibrate, further improving the screening effect of the fertilizer, and at the same time helping to reduce the probability of blockage of the internal screen of the filter screen 1.

[0057] See also Figure 2 , Figure 6 , Figure 7 , Fig.10 and Fig.11 The left-right moving component 2 51 includes a screw 2 511 rotatably installed between the left and right side walls of the filter screen 1, and the external thread of the screw 2 511 is connected to a slider 2 512, and a vertical groove 513 is opened on the slider 2 512. The front and rear ends of the push plate 4 are slidably connected in the corresponding vertical grooves 513 up and down. The right ends of the front and rear two screws 2 511 rotate to penetrate the right side of the filter screen 1 and are connected through the pulley assembly for transmission, and the right end of the front screw 2 511 is also connected to the screw 1 322 through the pulley assembly for transmission. The front and rear inner walls of the filter screen 1 are both installed with limited slot frames 53, and the slider 2 512 is slidably installed at the bottom of the corresponding limited slot frame 53.

[0058] When the lead screw 322 rotates, the lead screw 322 drives the front lead screw 511 to rotate through the belt, and then the front lead screw 511 drives the rear lead screw 511 to rotate synchronously through the belt. When the lead screw 322 drives the slide 31 to move to the left, the lead screw 511 drives the slider 2 512 to move to the right, and then the slider 2 512 drives the push plate 4 to move to the right, so that the push plate 4 can push the fertilizer screened in the filter screen 1 to the right to the discharge port 12 for discharge.

[0059] See also Fig.10 , Fig.11 and Fig.15The guide assembly 52 includes a right-angled trapezoidal groove 521 opened on the inner wall of the filter screen 1, the long bottom side of the right-angled trapezoidal groove 521 is located below the short bottom side and the hypotenuse is located on the right side of the vertical side, a wedge block 522 is fixedly installed at the connection between the long bottom side and the hypotenuse of the right-angled trapezoidal groove 521, the left side of the wedge block 522 is an inclined surface and the inclined surface gradually inclines from left to right toward the center of the filter screen 1, a guide block 523 is slidably installed at one end of the push plate 4 close to the right-angled trapezoidal groove 521, and the guide block 523 is slidably installed in the right-angled trapezoidal groove 521 at one end, and a return spring 524 is fixedly connected between the end of the guide block 523 close to the push plate 4 and the inner wall of the push plate 4.

[0060] When slider 2 512 drives the push plate 4 to move to the right, the guide block 523 slides to the right along the long bottom side of the right-angled trapezoidal groove 521. At this time, the push plate 4 moves against the upper surface of the screen in the filter screen 1 to push the fertilizer screened out of the filter screen 1 to the right. When the push plate 4 moves to the rightmost end of the long bottom side, the guide block 523 slides to the right along the inclined surface of the wedge block 522. At this time, the wedge block 522 can push the guide block 523 toward the inside of the push plate 4 and compress the return spring 1 524. When the guide block 523 moves to the right side of the wedge block 522, the rebound force of the return spring 1 524 is used to push the guide block 523 to move to the outside of the push plate 4, and the wedge block 522 is used to block the guide block 523 to prevent the push plate 4 from moving to the left along the long bottom of the right-angled trapezoidal groove 521.

[0061] When slider 2 512 drives the push plate 4 to move to the left, the guide block 523 moves upward along the hypotenuse of the right-angled trapezoidal groove 521, thereby driving the push plate 4 to move upward along the vertical groove 513, so that the push plate 4 is separated from the upper surface of the screen in the filter screen 1, and then the guide block 523 moves to the left along the short bottom side of the right-angled trapezoidal groove 521, so that the push plate 4 moves to the left above the screen, preventing the push plate 4 from pushing the fertilizer to the left end of the filter screen 1 and piling up together; when the guide block 523 moves to the left end of the short bottom side of the right-angled trapezoidal groove 521, the guide block 523 moves down along the vertical side of the right-angled trapezoidal groove 521 to the left end of the long bottom side under the action of gravity, so that the push plate 4 contacts the upper surface of the screen again.

[0062] See also Figure 2 , Figure 3 , Figure 4 and Figure 5 The top of the screening bin 6 is connected to the bottom of the filter screen 1, and the left side of the screening bin 6 is provided with a discharge port 2 61 and a discharge port 4 63 from top to bottom, the right side of the screening bin 6 is provided with a discharge port 3 62 located below the discharge port 4 63, and the bottom of the screening bin 6 is provided with a discharge port 5 64.

[0063] See also Figure 2 , Figure 3 , Figure 4 and Figure 5 The screening mechanism 7 includes a guide plate 71 rotatably installed between the front and rear inner walls of the screening bin 6. The guide plate 71 is located below the right half of the filter screen 1, and the right end of the guide plate 71 is in conflict with the right inner wall of the discharge port 61. A screening component 72 and a screening component 75 are slidably installed inside the screening bin 6. The screening component 72 and the screening component 75 are arranged left and right, and the screening component 75 is located below the screening component 72.

[0064] See also Figure 2 , Figure 3 , Figure 4 and Figure 5 The screening bin 6 is internally rotatably connected with shaft rod 1 and shaft rod 2, shaft rod 1 is fixedly connected to the right end of guide plate 1 71, shaft rod 2 is located below screening component 1 72 and is fixedly connected to guide plate 3 74 on the outside, the right end of guide plate 3 74 is located above screening component 2 75, the screening bin 6 is internally fixedly connected with guide plate 4 76 located below screening component 2 75, the right end of guide plate 4 76 is tilted downward and contacts the inner wall on the left side of discharge port 3 62, a scraper 79 is installed on the top of guide plate 4 76 for sliding back and forth, a forward and backward moving component 77 for driving screening component 1 72 and screening component 2 75 to move back and forth is installed on the front side of the screening bin 6, and an adjusting component 78 for driving shaft rod 1 and shaft rod 2 to rotate is installed on the rear side of the screening bin 6.

[0065] The fertilizer after preliminary screening by the filter screen 1 falls into the screening bin 6, the fertilizer screened by the left half of the filter screen 1 falls directly onto the screening component 1 72, the fertilizer screened by the right half of the filter screen 1 falls onto the guide plate 1 71, and then the fertilizer slides to the left along the guide plate 1 71 to the screening component 1 72, the screening component 1 72 performs secondary screening on the fertilizer, the fertilizer screened by the screening component 1 72 falls onto the guide plate 3 74, and then the fertilizer slides to the right along the guide plate 3 74 to the screening component 2 75 for the third screening, the fertilizer screened by the screening component 2 75 (that is, the fertilizer after the final screening) falls onto the guide plate 4 76, and then the fertilizer slides to the right along the guide plate 4 76 to the discharge port 3 62; the above screening process is the first screening mode, in which the fertilizer is screened three times.

[0066] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 and Fig.12The screening component 1 72 includes a support frame 721 which is slidably installed inside the screening bin 6. A plurality of elastic telescopic rods 722 distributed in a rectangular shape are fixedly installed on the top of the support frame 721. A screening mesh frame 723 is fixedly connected to the top of the plurality of elastic telescopic rods 722. A screening mesh is detachably installed on the top of the screening mesh frame 723. The top of the screening mesh frame 723 is fixedly connected to a material blocking plate 73 which is symmetrical about the screening mesh. The screening component 2 75 has the same structure as the screening component 1 72. The bottom of the support frame 721 in the screening component 2 75 is fixedly connected to the scraper 79 by a hinge.

[0067] When fertilizer falls onto the screening frame 723, the impact force of the falling fertilizer and gravity are used to make the elastic telescopic rod 722 telescope, so that the screening frame 723 vibrates up and down, thereby improving the screening effect of the screening frame 723. The baffle plate 73 can form a barrier on the front and back sides of the screening net to prevent the fertilizer from falling from the front and back sides of the screening net.

[0068] See also Figure 2 , Figure 3 , Figure 4 , Fig.12 , Fig.13 and Fig.14 The front-to-back moving component 77 includes a push-pull rod 771 slidably installed on the front side of the screening bin 6. The upper and lower ends of the push-pull rod 771 are fixedly connected to the corresponding support frames 721 in the screening component 1 72 and the screening component 2 75 through a rotating rod connected in rotation. A driving motor 2 772 is fixedly installed on the front side of the screening bin 6. A turntable 2 773 is fixedly connected to the right side of the output shaft of the driving motor 2 772. A push rod 2 774 is fixedly connected to the edge of the right side of the turntable 2 773. A through slot 2 775 is opened on the push-pull rod 771. The push rod 2 774 is slidably installed inside the through slot 2 775. The upper and lower ends of the push-pull rod 771 are respectively installed with a rotating motor 776 for driving the corresponding rotating rod to rotate.

[0069] By driving the second motor 772 to drive the turntable 773 to rotate, and then the turntable 773 drives the push rod 774 to rotate, so that the push rod 774 can push the push-pull rod 771 to move forward and backward, and then the push-pull rod 771 drives the support frame 721 in the screening component 1 72 and the screening component 2 75 to move forward and backward through the rotating rod, and then the support frame 721 drives the screening frame 723 to move forward and backward, so as to avoid the accumulation of fertilizer on the screening frame 723 and improve the screening effect of the screening frame 723 on the fertilizer.

[0070] When the fertilizer screened out from the screening component 1 72 and the screening component 2 75 is to be discharged, the bellows 2 stops loading into the filter screen 1, and the corresponding rotating rod is driven to rotate by the rotating motor 776, and then the rotating rod drives the corresponding support frame 721 to rotate counterclockwise. At this time, the left side of the screening mesh frame 723 in the screening component 1 72 tilts downward to the discharge port 2 61, and the fertilizer of the corresponding particle size on the screening mesh frame 723 is discharged from the discharge port 2 61. At the same time, the left end of the screening mesh frame 723 in the screening component 2 75 tilts downward to the top of the discharge port 5 64, and the fertilizer of the corresponding particle size on the screening mesh frame 723 is discharged from the discharge port 5 64. While discharging, the forward and backward moving component 77 causes the support frame 721 to drive the screening mesh frame 723 to move forward and backward, thereby improving the discharge efficiency.

[0071] See also Figure 3 , Figure 4 and Figure 5 The adjustment component 78 includes a drive motor 3 781 fixedly installed on the rear side of the screening bin 6. The output shaft of the drive motor 3 781 is fixedly connected to the shaft rod 2. The rear end of the shaft rod 1 rotates and passes through the rear of the screening bin 6. The drive motor 3 781 is connected to the shaft rod 1 through a pulley assembly.

[0072] When the apertures of the screening meshes in screening component 1 72 and screening component 2 75 are the same, shaft rod 2 is driven to rotate by driving motor 3 781, and then shaft rod 2 drives guide plate 3 74 to rotate counterclockwise, so that the left end of guide plate 3 74 rotates to contact the bottom edge of discharge port 4 63, and the right end contacts the lower right end of screening component 1 72. At the same time, driving motor 3 781 rotates through belt shaft rod 1, so that shaft rod 1 drives guide plate 1 71 to rotate counterclockwise, so that the left end of guide plate 1 71 rotates to the lower right side of screening component 1 72 and points to the top of screening component 2 75. At this time, part of the fertilizer screened by the internal screen of filter screen 1 is screened by screening component 1 72, and the other part falls into screening component 2 75 for screening. Screening component 1 72 and screening component 2 75 cooperate to implement component-type overall secondary screening, which is the second screening mode. In this mode, the fertilizer is screened twice.

[0073] See also Figure 1-Figure 15 When used specifically, the first screening mode: Step 1, when the aperture of the screening mesh in the screening component 1 72 is larger than the aperture of the screening mesh in the screening component 2 75, the left end of the guide plate 1 71 is located above the screening component 1 72, the left end of the guide plate 3 74 is located above the discharge port 4 63, and the right end is close to the upper end of the screening component 2 75, and the fertilizer is transported to the filter screen 1 for screening through the corrugated telescopic tube 2.

[0074] Step 2: Drive the lead screw 322 to rotate by driving the motor 324, and then the slider 323 drives the slide seat 31 to move to the right, thereby driving the right end of the bellows 2 to move to the right, so that the bellows 2 gradually extends, and the bellows 2 lays the fertilizer inside the filter screen 1 from left to right.

[0075] Step three, when the slide 31 moves to the right, the slide 31 drives the rotating shaft 2 345 and the driving gear 346 to move to the right, and the rack 347 is used to drive the driving gear 346 and the rotating shaft 2 345 to rotate, and then the rotating shaft 2 345 drives the rotating shaft 1 341 and the turntable 1 342 to rotate through the bevel gear set, and the rotation of the turntable 1 342 will drive the push rod 1 343 to rotate, and then the push rod 1 343 is used to drive the swing rod 33 to swing back and forth, and then the swing rod 33 drives the right end of the bellows 2 to swing back and forth, so that the bellows 2 can disperse the fertilizer into the filter screen 1 front and back, and at the same time, the right end of the bellows 2 will continuously hit the inner wall of the filter screen 1 during the swinging process, causing the filter screen 1 to vibrate.

[0076] Step 4, in the initial state, the push plate 4 is located at the right end of the screen. When the slide 31 moves to the right, the lead screw 1 322 drives the lead screw 2 511 on the front side to rotate through the belt, and the lead screw 2 511 on the front side drives the lead screw 2 511 on the rear side to rotate through the belt. The lead screw 2 511 drives the slider 2 512 to move to the left, and the guide block 523 moves upward along the hypotenuse of the right-angle trapezoidal groove 521, thereby driving the push plate 4 to move upward along the vertical groove 513, so that the push plate 4 and the screen are aligned. The upper surface of the screen in the filter screen 1 is separated, and then the guide block 523 moves to the left along the short bottom side of the right-angled trapezoidal groove 521, so that the push plate 4 moves to the left above the screen, preventing the push plate 4 from pushing the fertilizer to the left end of the filter screen 1 and piling up together. When the guide block 523 moves to the left end of the short bottom side of the right-angled trapezoidal groove 521, the guide block 523, under the action of gravity, flows down along the vertical side of the right-angled trapezoidal groove 521 to the left end of the long bottom side, and moves the push plate 4 to the left end of the screen.

[0077] Step 5, when the right end of the bellows expansion tube 2 moves to the right end of the filter screen 1, the driving motor 1 324 drives the lead screw 1 322 to rotate in the opposite direction, and the slide seat 31 drives the right end of the bellows expansion tube 2 to move to the left. In the process of the bellows expansion tube 2 moving to the left, the driving motor 1 324 drives the lead screw 2 511 to rotate in the opposite direction through the belt, so that the lead screw 2 511 drives the slider 2 512 to move to the right, and then the slider 2 512 drives the push plate 4 to move to the right. At this time, the guide block 523 moves to the right along the long bottom side of the right-angled trapezoidal groove 521, so that the push plate 4 can push the screened materials in the filter screen 1. The fertilizer is pushed to the right to be discharged at the discharge port 12. When the guide block 523 moves to the rightmost end of the long bottom edge, the guide block 523 slides to the right along the inclined surface of the wedge block 522. At this time, the wedge block 522 can push the guide block 523 toward the inside of the push plate 4 and compress the return spring 524. When the guide block 523 moves to the right side of the wedge block 522, the rebound force of the return spring 524 is used to push the guide block 523 to move to the outside of the push plate 4, and the wedge block 522 is used to block the guide block 523 to prevent the push plate 4 from moving to the left along the long bottom of the right-angled trapezoidal groove 521.

[0078] Step six, the fertilizer after preliminary screening by the filter screen 1 falls into the screening bin 6, the fertilizer screened by the left half of the filter screen 1 falls directly onto the screening net in the screening component 1 72, the fertilizer screened by the right half of the filter screen 1 falls onto the guide plate 1 71, and then the fertilizer slides to the left along the guide plate 1 71 to the screening net in the screening component 1 72, and the fertilizer is screened twice, the fertilizer screened by the screening net in the screening component 1 72 falls onto the guide plate 3 74, and then the fertilizer slides to the right along the guide plate 3 74 to the screening net in the screening component 2 75 for the third screening, the fertilizer screened by the screening net in the screening component 2 75 falls onto the guide plate 4 76, and then the fertilizer slides to the right along the guide plate 4 76 to be discharged at the discharge port 3 62.

[0079] Step seven, when screening component one 72 and screening component two 75 screen the fertilizer, the turntable two 773 is driven to rotate by driving motor two 772, and then the turntable two 773 drives the push rod two 774 to rotate, so that the push rod two 774 can push the push-pull rod 771 to move forward and backward, and then the push-pull rod 771 drives the support frame 721 in the screening component one 72 and the screening component two 75 to move forward and backward through the pull rod, and then the support frame 721 drives the screening mesh frame 723 to move forward and backward to prevent the fertilizer from accumulating on the screening mesh frame 723. When the support frame 721 in the screening component two 75 moves forward and backward, the support frame 721 in the screening component two 75 will drive the scraper 79 to move forward and backward, so that the scraper 79 scrapes the fertilizer on the guide plate four 76 to prevent the fertilizer from accumulating on the guide plate four 76.

[0080] Step eight, when the fertilizer screened on the screening component 1 72 and the screening component 2 75 is to be discharged, the bellows 2 stops feeding into the filter screen 1, and the corresponding rotating rod is driven to rotate by the rotating motor 776, and then the rotating rod drives the corresponding support frame 721 to rotate counterclockwise, and the left side of the screening mesh frame 723 in the screening component 1 72 tilts downward to the discharge port 2 61, and the fertilizer of the corresponding particle size on the screening mesh frame 723 is discharged from the discharge port 2 61, and at the same time, the left end of the screening mesh frame 723 in the screening component 2 75 tilts downward to the top of the discharge port 5 64, and the fertilizer of the corresponding particle size on the screening mesh frame 723 is discharged from the discharge port 5 64, and while discharging, the forward and backward moving component 77 causes the support frame 721 to drive the screening mesh frame 723 to move forward and backward.

[0081] The first screening mode: Step 1, when the apertures of the screening meshes in screening component 1 72 and screening component 2 75 are the same, the shaft rod 2 is driven to rotate by driving motor 3 781, and then shaft rod 2 drives the guide plate 3 74 to rotate counterclockwise, so that the left end of the guide plate 3 74 rotates to contact the bottom edge of the discharge port 4 63, and at the same time, the driving motor 3 781 rotates through the belt shaft rod 1, so that shaft rod 1 drives the guide plate 1 71 to rotate counterclockwise, so that the left end of the guide plate 1 71 rotates to the bottom of the screening component 1 72 and points to the top of the screening component 2 75.

[0082] Step 2: Repeat the process of steps 2 to 5 in the first screening mode above.

[0083] Step three, the fertilizer after preliminary screening by the filter screen 1 falls into the screening bin 6, the fertilizer screened by the left half of the filter screen 1 falls directly onto the screening net in the screening component 1 72, and the fertilizer screened by the right half of the filter screen 1 falls directly onto the screening component 2 75. The screening component 1 72 and the screening component 2 75 cooperate to implement the component-type overall secondary screening. The fertilizer screened by the screening net in the screening component 1 72 falls onto the guide plate 3 74, and then slides to the left along the guide plate 3 74 to the discharge port 4 63 for discharge. The fertilizer screened by the screening net in the screening component 2 75 falls onto the guide plate 4 76, and then the fertilizer slides to the right along the guide plate 4 76 to the discharge port 3 62 for discharge.

[0084] Step 4, when the fertilizer screened on the screening component 1 72 and the screening component 2 75 is to be discharged, the bellows 2 stops loading into the filter screen 1, and the corresponding rotating rod is driven to rotate by the rotating motor 776, and then the rotating rod drives the corresponding support frame 721 to rotate counterclockwise, and the left side of the screening mesh frame 723 in the screening component 1 72 tilts downward to the discharge port 2 61, and the fertilizer of the corresponding particle size on the screening mesh frame 723 is discharged from the discharge port 2 61, and at the same time, the left end of the screening mesh frame 723 in the screening component 2 75 tilts downward to the top of the discharge port 5 64, and the fertilizer of the corresponding particle size on the screening mesh frame 723 is discharged from the discharge port 5 64, and while discharging, the forward and backward moving component 77 causes the support frame 721 to drive the screening mesh frame 723 to move forward and backward.

[0085] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for preparing a mixed nutrient-enriched fertilizer, characterized in that: The following steps are involved: S1. Fertilizer mixing: First, various basic fertilizers are added into the mixer according to a certain formula ratio and mixed thoroughly; S2. Granulation: The mixed fertilizer particles are granulated by a drum granulator or a disc granulator. During the granulation process, a binder is sprayed on the material to bind the fertilizer particles together to form fertilizer particles of uniform size. S3, Drying: The fertilizer particles with uniform size after granulation are sent to the dryer, and the hot air fully contacts with the fertilizer particles to evaporate the water; S4, screening: the dried fertilizer particles are screened by screening equipment to remove oversized and undersized fertilizer particles; S5, cooling: the qualified fertilizer particles after screening are put into the cooler for cooling, so that the temperature is reduced to a suitable range; S6. Packaging and storage: Packaging and storing the cooled qualified fertilizer particles; The screening device involved in the above-mentioned step S4 comprises a screening bin (6), a filter screen (1) and a gantry (11) fixedly mounted on the top of the screening bin (6), a corrugated telescopic tube (2) fixedly mounted at the bottom of the horizontal section of the gantry (11), the right end of the corrugated telescopic tube (2) being located above the screen inside the filter screen (1), and a material spreading mechanism (3) being mounted on the gantry (11); the material spreading mechanism (3) comprising a left-right moving component (32) for controlling the extension and retraction of the corrugated telescopic tube (2) to implement uniform material spreading, and a swinging component (34) for driving the right end of the corrugated telescopic tube (2) to swing back and forth; A push plate (4) and a driving mechanism (5) for driving the push plate (4) to move left and right to push and discharge the material are slidably mounted inside the filter screen (1); a screening mechanism (7) is mounted on the screening bin (6); the screening mechanism (7) comprises a screening component 1 (72) and a screening component 2 (75) which are arranged to slide forward and backward; the screening component 2 (75) cooperates with the screening component 1 (72) to perform multi-stage screening and discharge of the fertilizer.

2. A process for preparing a mixed nutrient-enriched fertilizer according to claim 1, characterized in that: The material spreading mechanism (3) further comprises a slide seat (31) slidably mounted on the bottom of the horizontal section of the gantry (11), and the left-right moving component (32) is mounted on the gantry (11); the left-right moving component (32) comprises a slide groove (321) opened in the horizontal section of the gantry (11), a lead screw (322) is rotatably mounted inside the slide groove (321), a slider (323) is externally threadedly connected to the lead screw (322), the bottom of the slider (323) is fixedly connected to the top of the slide seat (31), and a driving motor (324) for driving the lead screw (322) to rotate is fixedly mounted on the left side of the gantry (11).

3. A process for preparing a mixed nutrient-enriched fertilizer according to claim 2, characterized in that: The right end of the slide (31) is rotatably connected to a swing rod (33), the bottom end of the swing rod (33) is rotatably connected to a round rod, the round rod is fixedly connected to the right side of the bellows expansion tube (2), and the swing assembly (34) is installed on the slide (31); the swing assembly (34) comprises a rotating shaft (341) rotatably installed at the bottom of the slide (31), the right end of the rotating shaft (341) is fixedly connected to a rotating disk (342), the right edge of the rotating disk (342) is fixedly connected to a push rod (343), the swing rod (31) is fixedly connected to the right side of the rotating disk (342), and the swing rod (31) is fixedly connected to the right side of the rotating disk (342). A through slot (344) is provided on the gantry (11), the push rod (343) is slidably installed inside the through slot (344), a rotating shaft (345) is rotatably installed on the slide seat (31), the bottom end of the rotating shaft (345) is transmission-connected with the left end of the rotating shaft (341) through a bevel gear set, the top of the rotating shaft (345) is fixedly connected with a driving gear (346), and the bottom of the horizontal section of the gantry (11) is fixedly connected with a rack (347), and the driving gear (346) is meshed with the rack (347).

4. A process for preparing a mixed nutrient-enriched fertilizer according to claim 2, characterized in that: The driving mechanism (5) comprises a left-right moving assembly (51) mounted on the front and rear inner walls of the filter screen (1) and used to drive the push plate (4) to move left and right; the left-right moving assembly (51) comprises a lead screw (511) rotatably mounted between the left and right side walls of the filter screen (1); the outer thread of the lead screw (511) is connected to a slider (512); a vertical groove (513) is provided inside the slider (512); the front and rear ends of the push plate (4) are slidably connected in the corresponding vertical grooves (513) up and down; the right ends of the front and rear lead screws (511) rotate to penetrate the right side of the filter screen (1) and are then connected by a pulley assembly for transmission; the right end of the front lead screw (511) is also connected to the lead screw (322) by a pulley assembly for transmission; the front and rear inner walls of the filter screen (1) are both installed with a limit slot frame (53); the slider (512) is slidably mounted at the bottom of the limit slot frame (53) for left and right movement.

5. A process for preparing a mixed nutrient-enriched fertilizer according to claim 4, characterized in that: The driving mechanism (5) further comprises a guiding assembly (52) for guiding the push plate (4) to move up and down, and the left-right moving assembly (51) corresponds to the guiding assembly (52) in a one-to-one manner; the guiding assembly (52) comprises a right-angled trapezoidal groove (521) provided on the inner wall of the filter screen (1), the long bottom side of the right-angled trapezoidal groove (521) being located below the short bottom side and the hypotenuse being located on the right side of the vertical side, and a wedge-shaped block (522) being fixedly installed at the connection between the long bottom side and the hypotenuse of the right-angled trapezoidal groove (521) The left side of the wedge block (522) is an inclined surface, and the inclined surface gradually inclines from left to right in a direction close to the center of the filter screen (1); a guide block (523) is slidably installed forward and backward at one end of the push plate (4) close to the right-angled trapezoidal groove (521); an end of the guide block (523) away from the push plate (4) is slidably installed in the right-angled trapezoidal groove (521); a return spring (524) is fixedly connected between one end of the guide block (523) close to the push plate (4) and the inner wall of the push plate (4).

6. A process for preparing a mixed nutrient-enriched fertilizer according to claim 1, characterized in that: The top of the screening bin (6) is connected to the bottom of the filter screen (1); the left side of the screening bin (6) is provided with a second discharge port (61) and a fourth discharge port (63) from top to bottom; the right side of the screening bin (6) is provided with a third discharge port (62) located below the fourth discharge port (63); and the bottom of the screening bin (6) is provided with a fifth discharge port (64).

7. A process for preparing a mixed nutrient-enriched fertilizer according to claim 6, characterized in that: The screening mechanism (7) further comprises a guide plate (71) rotatably mounted between the front and rear inner walls of the screening bin (6), the guide plate (71) being located below the right half of the filter screen (1), the screening bin (6) being internally rotatably connected with a shaft rod (1) and a shaft rod (2), the shaft rod (1) being fixedly connected to the right end of the guide plate (71), the shaft rod (2) being located below the screening assembly (72) and having a guide plate (74) fixedly connected to the outside thereof, the guide plate (74) being internally rotatably connected with a shaft rod (1) and a right end of the shaft rod (1), the shaft rod (2) being located below the screening assembly (72) and having a guide plate (74) fixedly connected to the outside thereof, the guide plate (74) being internally rotatably connected with a shaft rod (1) and a right end of the shaft rod (1) and a right end of the shaft rod (1) ) is located above the screening component two (75), and the interior of the screening bin (6) is fixedly connected with a guide plate four (76) located below the screening component two (75), the right end of the guide plate four (76) is tilted downward and abuts against the left inner wall of the discharge port three (62), and a scraper (79) is installed on the top of the guide plate four (76) for sliding back and forth, and an adjustment component (78) is installed on the rear side of the screening bin (6) for driving the shaft rods one and two to rotate.

8. A process for preparing a mixed nutrient-enriched fertilizer according to claim 7, characterized in that: The screening component 1 (72) comprises a support frame (721) which is slidably mounted inside the screening bin (6) in a forward and backward manner, a plurality of elastic telescopic rods (722) distributed in a rectangular shape are fixedly mounted on the top of the support frame (721), a screening mesh frame (723) is fixedly connected to the tops of the plurality of elastic telescopic rods (722), a screening mesh is detachably mounted on the top of the screening mesh frame (723), and a material blocking plate (73) which is symmetrical with respect to the front and rear of the screening mesh is fixedly connected to the top of the screening mesh frame (723). The screening component 2 (75) has the same structure as the screening component 1 (72), and the bottom of the support frame (721) in the screening component 2 (75) is fixedly connected to the scraper (79) by a hinge.

9. A process for preparing a mixed nutrient-enriched fertilizer according to claim 8, characterized in that: The screening mechanism (7) further comprises a forward and backward moving assembly (77) installed at the front side of the screening bin (6) for driving the screening assembly 1 (72) and the screening assembly 2 (75) to move forward and backward, the forward and backward moving assembly (77) comprising a push-pull rod (771) installed at the front side of the screening bin (6) in a forward and backward sliding manner, the upper and lower ends of the push-pull rod (771) being respectively fixedly connected to the corresponding support frames (721) in the screening assembly 1 (72) and the screening assembly 2 (75) via rotating rods connected in rotation, the screening bin (6) A second driving motor (772) is fixedly installed on the front side, a second turntable (773) is fixedly connected to the right side of the output shaft of the second driving motor (772), a second push rod (774) is fixedly connected to the edge of the right side of the second turntable (773), a second through slot (775) is opened inside the push-pull rod (771), the second push rod (774) is slidably installed inside the second through slot (775), and a rotating motor (776) for driving the corresponding rotating rod to rotate is respectively installed at the upper and lower ends of the push-pull rod (771).

10. The process for making a mixed nutrient-enriched fertilizer according to claim 7, characterized in that: The adjustment assembly (78) includes a drive motor three (781) fixedly mounted on the rear side of the screening bin (6); the output shaft of the drive motor three (781) is fixedly connected to the shaft rod two; the rear end of the shaft rod one rotates and passes through the rear of the screening bin (6); the drive motor three (781) is connected to the shaft rod one through a pulley assembly.

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