CN116393350A - Fertilizer screening device - Google Patents

Abstract

The invention relates to the technical field of chemical fertilizer production equipment, and discloses a chemical fertilizer sieving device, which includes a cavity, the top of the cavity is provided with a feed port, and the bottom of the cavity is provided with a plurality of discharge ports. A multi-stage sieving mechanism is provided in the cavity, and the multi-stage sieving mechanism is respectively connected to each discharge port through a multi-stage discharging mechanism. The multi-stage sieving mechanism includes a plurality of horizontally parallel annular screening conveyor belts , the surface of each of the annular screening conveyor belts is provided with evenly distributed sieve holes, and among the adjacent annular screening conveyor belts, the sieve holes on the upper annular screening conveyor belt are larger than those on the lower annular screening conveyor belt. sieve holes, the ring-shaped screening conveyor belt is tensioned and connected by a screening drive mechanism, and a screen hole dredging mechanism is also provided under the conveying surface of the ring-shaped screening conveyor belt, and the screen hole dredging mechanism passes through a power transmission mechanism Connected with the screening drive mechanism, it has the advantages of high screening efficiency, good screening effect, simple structure and low labor cost.

Description

A chemical fertilizer screening device

technical field

The invention relates to the technical field of chemical fertilizer production equipment, in particular to a chemical fertilizer sieving device.

Background technique

Chemical fertilizers, referred to as chemical fertilizers. Fertilizers made by chemical and (or) physical methods containing one or several nutrient elements needed for the growth of crops. Also known as inorganic fertilizers, including nitrogen fertilizers, phosphorus fertilizers, potassium fertilizers, micro-fertilizers, compound fertilizers, etc., they are not edible, and they have the following common characteristics: simple ingredients, high nutrient content; fast fertilizer effect, strong fertilizer; some fertilizers have acid-base Reaction; generally does not contain organic matter, and has no effect of improving soil and fertilizing.

In the process of chemical fertilizer production, it is a very important step to separate the size of fertilizer particles. Generally, the method of separating fertilizers of different sizes is to use a screening device for screening, and the existing screening device is in the screening process. In the process, the size of the fertilizer particles is similar to that of the screen, which causes the screen to be clogged, which greatly reduces the screening efficiency.

The invention patent with the application publication number of CN107744948A discloses an anti-clogging chemical fertilizer screening machine, which is equipped with a box body, a slideway, a screen, a feeding cylinder, a bearing with a seat, a screw, a second motor, a second pulley, and a second belt , The first collection box and the second collection box, put the fertilizer raw materials in the feeding cylinder, the second motor waits for the rotation of the second pulley, so that the screw pushes the raw materials, and the raw materials fall freely to the screen. The upper part is screened by the screen Divide, so that the raw materials with uneven size are screened into two parts and put into the first collection box and the second collection box respectively, so as to achieve the purpose of easy screening. By setting bearings, rotating shafts, connecting rods, brushes, and second A motor, the first pulley and the first belt, the first motor drives the first pulley to rotate, so that the first pulley makes the rotating shaft rotate through the transmission of the first belt, and when the rotating shaft rotates, it drives the connecting rod to operate, so that the brush pair The surface of the sieve is cleaned to avoid the problem that fertilizer particles with a size similar to the diameter of the sieve get stuck on the sieve and block the sieve. But this device has the following problems: the brush can only partially clean the area within its rotation range, while other positions on the screen cannot be cleaned, and the screening effect is poor.

Contents of the invention

The object of the present invention is to provide a chemical fertilizer sieving device, which can continuously clean the sieve holes, effectively prevent the sieve holes from being blocked, and has the advantages of high sieving efficiency, good sieving effect, simple structure and low labor cost.

Above-mentioned technical purpose of the present invention is achieved through the following technical solutions:

A chemical fertilizer sieving device, comprising a cavity, the top of the cavity is provided with a feed port, the bottom of the cavity is provided with a plurality of discharge ports, and the inner cavity of the cavity is provided with a multi-stage sieving mechanism. The multi-stage sieving mechanism is respectively connected with each discharge port through a multi-stage discharge mechanism, and the multi-stage sieving mechanism includes a plurality of horizontally parallel annular screening conveyor belts, and the surface of each annular screening conveyor belt is All are provided with uniformly distributed sieve holes, and the sieve holes on the upper annular sieving conveyor belt in the adjacent annular sieving conveyor belts are larger than the sieve holes on the lower annular sieving conveyor belt. The screen drive mechanism is tensioned and connected, and a screen hole dredging mechanism is provided under the conveying surface of the endless screen conveyor belt, and the screen hole dredging mechanism is connected with the screen drive mechanism through a power transmission mechanism.

By adopting the above technical scheme, the multi-stage sieving mechanism sequentially sieves the fertilizer multiple times through multiple horizontally parallel ring-shaped screening conveyor belts, thereby separating particles of different particle sizes from the fertilizer. Driven by the sub-drive mechanism, it rotates circularly, so that the particles left on the circular screening conveyor belt after being screened are discharged from each outlet in turn through the multi-stage discharge mechanism, and the screening drive mechanism is driving the circular screening conveyor belt. While moving, it also drives the sieve hole dredging mechanism to repeatedly dredge the sieve holes on the circular screening conveyor belt, which can effectively prevent the sieve holes from being blocked and greatly improve the screening effect.

A further setting of the present invention is: the multi-stage discharge mechanism includes a plurality of discharge guide plates respectively matched with each annular screening conveyor belt, and each discharge material guide plate is along the conveying end of the circular screening conveyor belt. It is arranged obliquely downward, and the lower ends of each of the discharge guide plates are respectively opposite to each discharge port.

By adopting the above-mentioned technical scheme, the chemical fertilizer left on the circular screening conveyor belt after being screened can be transported to the end with the circular screening conveyor belt and directly falls on the discharge guide plate, and is discharged along the discharge guide plate under the action of gravity. Slide the downward sloping surface of the material plate into each discharge port to discharge.

A further setting of the present invention is: the screening drive mechanism includes a driving roller and a driven roller, both ends of the driving roller and the driven roller are respectively connected to the cavity in rotation, and the driving roller is connected to the Drive motor connection.

By adopting the above technical scheme, the screening drive mechanism realizes the tension of the endless screening conveyor belt through the driving roller and the driven roller, and the driving motor is used to drive the driving roller to rotate, so that the circular screening conveyor belt rotates circularly, thereby realizing the fertilizer Continuous screening, simple structure, high screening efficiency.

A further setting of the present invention is that: the sieve hole dredging mechanism includes a plurality of ejector pins that match the position of the sieve holes on the annular screening conveyor belt, and each ejector pin is respectively fixed on a plurality of mutually parallel support rods, each The two ends of the support rod are respectively fixedly connected with the moving rod one and the moving rod two on the front and rear side walls of the cavity, the moving rod one and the moving rod two are connected with the driving roller through the power transmission mechanism, the moving rod one and the moving rod The two ends of the rod two are respectively provided with a rack one and a rack two perpendicular to the conveying direction, and the rack one and the rack two mesh with the gear one and the gear two which are rotatably connected to the cavity respectively.

By adopting the above technical scheme, since the racks 1 and 2 perpendicular to the conveying direction at both ends of the moving rod 1 and the moving rod 2 mesh with the gear 1 and the gear 2 respectively, the moving rod 1 and the moving rod 2 can only move up and down. When the driving motor drives the driving roller to rotate to drive the circular screening conveyor belt to rotate, the driving roller synchronously drives the moving rod 1 and the moving rod 2 to reciprocate up and down through the power transmission mechanism, so that when the moving rod 1 and the moving rod 2 reciprocate up and down, it will drive The ejector pins on each support rod continuously dredge the sieve holes on the circular screening conveyor belt, so that the circular screening conveyor belt always maintains a good screening effect, and the horizontal movement of the circular screening conveyor belt is made by the power transmission mechanism Linked with the longitudinal movement of the ejector pin, it can not only effectively ensure that the ejector pin is always accurately aligned with the sieve hole on the circular screening conveyor belt, but also effectively improves the reliability of the sieve hole dredging mechanism, and can also reduce the The setting of the power equipment effectively reduces the equipment cost and kills two birds with one stone.

A further setting of the present invention is: the power transmission mechanism includes a connecting rod 1 and a connecting rod 2, one end of the connecting rod 1 and the connecting rod 2 are respectively connected in rotation with the moving rod 1 and the moving rod 2, and the connecting rod 1 and the The other end of the connecting rod 2 is respectively connected to the center of the circle of the toothed disc 1 and the toothed disc 2 which are rotatably connected to the front and rear side walls of the cavity. ring mesh.

By adopting the above-mentioned technical scheme, when the driving roller rotates, the ring gears provided at both ends of the driving roller respectively drive the first toothed disc and the second toothed disc to rotate synchronously. One end of the connecting rod makes a circular motion around the rotation center of the toothed disc 1 and the toothed disc 2 respectively, so that the other ends of the connecting rod 1 and the connecting rod 2 respectively drive the moving rod 1 and the moving rod 2 to reciprocate up and down, thereby realizing the circular screening conveyor belt continuous dredging operation.

A further setting of the present invention is that: the centers of the end faces of the first gear and the second gear are fixed with gravity hammers.

By adopting the above technical scheme, when the moving rod 1 and the moving rod 2 reciprocate up and down, the rack 1 and the rack 2 at the two ends of the moving rod 1 and the moving rod 2 reciprocate up and down synchronously with the moving rod 1 and the moving rod 2, and the rack When gear 1 and rack 2 reciprocate up and down, gear 1 and gear 2 are driven to reciprocate. When gear 1 and gear 2 reciprocate, they drive the gravity hammer to reciprocate. When the gravity hammer reciprocates, it continuously strikes the ring-shaped screening conveyor belt above it. , vibration, so that the fertilizer particles on the circular screening conveyor belt jump, roll and complete the sieving process according to the size of the sieve hole. The fertilizer particles are more dispersed during the jumping and rolling process, and are not easy to bond. Therefore, screening Higher efficiency and better screening effect.

A further setting of the present invention is that: the end of the discharge guide plate close to the conveying end of the endless screening conveyor belt conflicts with the upper surface of the endless screening conveyor belt.

By adopting the above technical scheme, the end of the discharge guide plate close to the conveying end of the circular screening conveyor belt is in conflict with the upper surface of the circular screening conveyor belt, which can not only effectively ensure that the screened fertilizer particles can be discharged along the discharge guide plate. It can also clean the upper surface of the circular screening conveyor belt when the circular screening conveyor belt continues to move, so that the upper surface of the circular screening conveyor belt can always maintain a good screening effect.

A further setting of the present invention is: the feed inlet is connected to the feed hopper, and the bottom opening of the feed hopper is also provided with a downwardly inclined extension plate, and the extension plate is directed against the circular screening conveyor belt One side of the conveying direction extends, and there is a certain gap between the bottom of the extension plate and the upper surface of the annular screening conveyor belt, and a plurality of material shifting rods are evenly distributed at equal intervals on the bottom of the extension plate.

By adopting the above technical scheme, the extension plate is used to divert the fertilizer in the feeding hopper on the one hand, so that the fertilizer falls on the surface of the circular screening conveyor belt at a slow speed, which can effectively reduce the dust in the fertilizer particles when feeding Splashing, and the gap between the bottom of the extension plate and the upper surface of the circular screening conveyor belt allows the fertilizer to be evenly spread on the surface of the circular screening conveyor belt with a certain thickness, avoiding the effect of screening due to accumulation. The problem, in addition, the multiple dials at the bottom of the extension plate form a comb-like shape, which can further disperse the fertilizer particles spread on the circular screening conveyor belt, so that the fertilizer dispersibility is better, which is conducive to further improving the screening of chemical fertilizers Effect.

The further setting of the present invention is: each discharge port is connected with a plurality of discharge hoppers respectively, and the side of each discharge guide plate close to the conveying end of the annular screening conveyor belt is connected to the side wall of the cavity through a revolving pin. The side of the discharge guide plate far away from the conveying end of the annular screening conveyor belt is respectively carried on the support pins, and the lower end of each discharge guide plate is equipped with a vibration guide mechanism, and the vibration guide mechanism includes The rotating shaft is divided into the conveying direction of the conveyor belt. The two ends of the rotating shaft are respectively connected to the side wall of the cavity. A plurality of paddles are evenly distributed on the outer wall of the rotating shaft. The rotating shaft is located on the discharge guide plate On the extension line of the end, the lower ends of the discharge guide plates are all located inside the circle where the end of each paddle board is located.

By adopting the above technical scheme, when the screened fertilizer particles on the upper surface of the annular screening conveyor belt are discharged downward along the discharge guide plate into the discharge port, they will directly impact the paddle in the vibration guide mechanism, so that the paddle It rotates synchronously with the rotating shaft. Since the lower end of the discharge guide plate is located inside the circle where the end of each paddle is located, the paddle will continuously hit the deflector when rotating, so that the discharge guide plate is in a state of constant vibration. Therefore, the material on the discharge guide plate can fall into the discharge hopper through the discharge port more smoothly, greatly reducing the problem that the fertilizer particles are stuck on the discharge guide plate and affect the discharge.

The beneficial effects of the present invention are:

1. In the present invention, the multi-stage sieving mechanism sequentially sieves the chemical fertilizer multiple times through a plurality of horizontally parallel annular sieving conveyor belts, thereby separating particles of different particle sizes in the chemical fertilizer, and the annular sieving conveyor belt is sieving Driven by the driving mechanism, it rotates circularly, so that the particles left on the circular screening conveyor belt after being screened are discharged from each discharge port sequentially through the multi-stage discharging mechanism, and the screening driving mechanism is driving the circular screening conveyor belt to move At the same time, it also drives the sieve hole dredging mechanism to repeatedly dredge the sieve holes on the circular screening conveyor belt, which can effectively prevent the sieve holes from being blocked and greatly improve the screening effect.

2. In the present invention, the screening driving mechanism drives the sieve dredging mechanism to repeatedly dredge the sieve holes on the circular sieving conveyor belt while driving the circular sieving conveyor belt to move, and the power transmission mechanism makes the circular sieving conveyor belt smooth. The linkage between the lateral movement and the longitudinal movement of the ejector pin can not only effectively ensure that the ejector pin is always accurately aligned with the sieve hole on the circular screening conveyor belt, but also effectively improve the reliability of the sieve hole dredging mechanism when it is working, and also It can reduce the setting of power equipment, effectively reduce the cost of equipment, and kill two birds with one stone.

3. In the present invention, gravity hammers are fixedly arranged at the center of the end face of gear one and gear two, so that when moving rod one and moving rod two reciprocate up and down, rack one and rack two at both ends of moving rod one and moving rod two follow Moving rod 1 and moving rod 2 reciprocate up and down synchronously. When rack 1 and rack 2 reciprocate up and down, gear 1 and gear 2 are driven to reciprocate. When gear 1 and gear 2 reciprocate, they drive the gravity hammer to reciprocate. Constantly knocking and vibrating the ring-shaped screening conveyor belt above it, so that the fertilizer particles on the ring-shaped screening conveyor belt jump and roll, and complete the screening process according to the size of the screen hole. The fertilizer particles are jumping and rolling. The dispersibility is better, and it is not easy to be bonded, so the screening efficiency is higher and the screening effect is better.

4. In the present invention, a downwardly inclined extension plate is provided at the bottom opening of the feed hopper. On the one hand, the extension plate is used to divert the fertilizer in the feed hopper, so that the fertilizer falls on the circular screening conveyor belt at a slow speed The surface can effectively reduce the dust splash in the fertilizer particles when feeding, and the gap between the bottom of the extension plate and the upper surface of the circular screening conveyor belt allows the fertilizer to be evenly spread on the circular screening conveyor with a certain thickness. The surface of the belt avoids the problem of affecting the screening effect due to accumulation. In addition, the multiple dials at the bottom of the extension plate form a comb-like shape, which can further disperse the fertilizer particles that are flat on the circular screening conveyor belt, so that The dispersion of chemical fertilizers is better, which is beneficial to further improve the screening effect of chemical fertilizers.

5. When the chemical fertilizer particles sieved on the upper surface of the annular screening conveyor belt in the present invention are discharged downward along the discharge guide plate into the discharge port, they will directly impact the paddle in the vibration guide mechanism, so that the paddle and the The rotating shaft rotates synchronously. Since the lower end of the discharge guide plate is located inside the circle where the end of each paddle board is located, the paddle board will continuously hit the deflector when rotating, so that the discharge guide plate is in a state of constant vibration, so The material on the discharge guide plate can fall into the discharge hopper through the discharge port more smoothly, greatly reducing the problem that the fertilizer particles are stuck on the discharge guide plate and affect the discharge.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic cross-sectional structure diagram of a chemical fertilizer sieving device of the present invention.

FIG. 2 is a partially enlarged schematic diagram of A in FIG. 1 .

Fig. 3 is a schematic diagram of the connection structure between the annular screening conveyor belt and the screening drive mechanism in a fertilizer screening device of the present invention.

Fig. 4 is a schematic diagram of the external structure of a chemical fertilizer sieving device of the present invention.

Fig. 5 is a schematic structural view of an extension plate in a fertilizer sorting device according to the present invention.

In the figure, 1, cavity; 2, feed inlet; 201, feed hopper; 202, extension plate; 203, shift rod; 3, discharge port; 301, discharge hopper; 302, repin; 303, support 4. Multi-stage sieving mechanism; 401. Ring-shaped screening conveyor belt; 402. Sieve hole; 5. Multi-stage discharge mechanism; 501. Discharge guide plate; 6. Screening drive mechanism; ; 602, driven roller; 603, drive motor; 7, sieve dredging mechanism; 701, ejector needle; 702, support rod; 703, moving rod one; 704, moving rod two; 705, rack one; 706, Rack two; 707, gear one; 708, gear two; 709, gravity hammer; 8, power transmission mechanism; 801, connecting rod one; 802, connecting rod two; 803, gear plate one; 804, gear plate two; 805 , ring gear; 9, vibration guide mechanism; 901, rotating shaft; 902, paddle board.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As shown in Figures 1 to 5, a chemical fertilizer screening device includes a cavity 1, the top of the cavity 1 is provided with a feed port 2, and the bottom of the cavity 1 is provided with a plurality of discharge ports 3, the cavity 1 The inner cavity of the body 1 is provided with a multi-stage sieving mechanism 4, and the multi-stage sieving mechanism 4 is respectively connected with each discharge port 3 through a multi-stage discharge mechanism 5, and the multi-stage sieving mechanism 4 includes a plurality of Horizontal and parallel ring-shaped screening conveyor belts 401, the surface of each of the ring-shaped screening conveyor belts 401 is provided with evenly distributed screen holes 402, and the ring-shaped screening conveyor belt 401 located above in the adjacent ring-shaped screening conveyor belts 401 The sieve hole 402 on the top is larger than the sieve hole 402 on the annular screening conveyor belt 401 below, and the annular screening conveyor belt 401 is tensioned and connected by the screening drive mechanism 6, and the conveying of the annular screening conveyor belt 401 A sieve hole dredging mechanism 7 is also arranged below the surface, and the sieve hole dredging mechanism 7 is connected with the sieving drive mechanism 6 through a power transmission mechanism 8 .

The multi-stage discharge mechanism 5 includes a plurality of discharge guide plates 501 respectively matched with the annular screening conveyor belts 401, and each discharge guide plate 501 moves downward along the conveying end of the annular screening conveyor belt 401. It is arranged obliquely, and the lower end of each discharge guide plate 501 is opposite to each discharge port 3 respectively.

The screening driving mechanism 6 includes a driving roller 601 and a driven roller 602, the two ends of the driving roller 601 and the driven roller 602 are respectively connected to the cavity 1 in rotation, and the driving roller 601 is fixed to the cavity 1 External drive motor 603 is connected.

The sieve hole dredging mechanism 7 includes a plurality of ejector pins 701 that match the positions of the sieve holes 402 on the annular screening conveyor belt 401, and each ejector pin 701 is respectively fixed on a plurality of mutually parallel support rods 702, each supporting The two ends of the rod 702 are respectively fixedly connected to the first moving rod 703 and the second moving rod 704 on the front and rear side walls of the cavity 1, and the first moving rod 703 and the second moving rod 704 are connected to the driving roller 601 through the power transmission mechanism 8, The two ends of the first moving rod 703 and the second moving rod 704 are respectively provided with a rack one 705 and a second rack 706 perpendicular to the conveying direction, and the first rack 705 and the second rack 706 are respectively connected to the cavity for rotation. The first gear 707 on the body 1 meshes with the second gear 708.

The power transmission mechanism 8 includes a connecting rod 1 801 and a connecting rod 2 802, one end of the connecting rod 801 and the connecting rod 2 802 are respectively rotatably connected to the moving rod 1 703 and the moving rod 2 704, and the connecting rod 1 801 and the other end of the connecting rod 2 802 are respectively connected to one side of the circle center of the first toothed plate 803 and the second toothed plate 804 which are rotatably connected to the front and rear side walls of the cavity 1, and the first toothed plate 803 and the second toothed plate 804 are respectively Mesh with ring gears 805 provided at both ends of driving roller 601 .

A gravity hammer 709 is fixed at the center of the end faces of the first gear 707 and the second gear 708 .

The end of the discharge guide plate 501 close to the conveying end of the endless screening conveyor belt 401 is in conflict with the upper surface of the endless screening conveyor belt 401 .

The feed port 2 is connected to the feed hopper 201, and the bottom opening of the feed hopper 201 is also provided with a downwardly inclined extension plate 202, and the extension plate 202 is conveyed against the endless screening conveyor belt 401. There is a certain gap between the bottom of the extension plate 202 and the upper surface of the annular screening conveyor belt 401 , and a plurality of shifting rods 203 are evenly distributed at equal intervals on the bottom of the extension plate 202 .

Each discharge port 3 is connected with a plurality of discharge hoppers 301 respectively, and each discharge guide plate 501 is connected to the side wall of the cavity 1 through the rotation pin 302 on the side close to the conveying end of the annular screening conveyor belt 401. The material guide plate 501 is carried on the support pin 303 on the side away from the conveying end of the annular screening conveyor belt 401 respectively, and the lower end of each discharge material guide plate 501 is provided with a vibration guide mechanism 9, and the vibration guide mechanism 9 It includes a rotating shaft 901 perpendicular to the conveying direction of the annular screening conveyor belt 401, the two ends of the rotating shaft 901 are respectively connected to the side wall of the cavity 1 in rotation, and a plurality of paddles 902 are evenly distributed on the outer wall of the rotating shaft 901 , the rotating shaft 901 is located on the extension line of the end of the discharge guide plate 501 , and the lower ends of the discharge guide plate 501 are located inside the circumference of the end of each paddle plate 902 .

Working principle of the present invention: each annular screening conveyer belt 401 in the multi-stage screening mechanism 4 rotates circularly under the drive of each screening drive mechanism 6, and the fertilizer particles in the feed hopper 201 pass through the opening at the bottom of the feed hopper 201 Lay along the extension plate 202 on the circular screening conveyor belt 401 that is positioned at the uppermost end in the multistage screening mechanism 4, the particles that are larger than the sieve holes 402 on the circular screening conveyor belt 401 stay in the circular screening conveyor belt 401 On the surface, particles that are smaller than the sieve holes 402 on the annular screening conveyor belt 401 directly fall into the next-stage annular screening conveyor belt 401 for the next step of screening. The particles of different grades and sizes on the surface of the screening conveyor belt 401 move to the conveying end and slide into the corresponding discharge hopper 301 along each discharge guide plate 501 in the multi-stage discharge mechanism 5. The fine particles sieved out of the sieving conveyor belt 401 directly fall into the discharge hopper 301 below it, thereby realizing the sieving operation of the fertilizer. In addition, while the circular sieving conveyor belt 401 rotates circularly, the sieving drive mechanism 6. Simultaneously drive the sieve hole dredging mechanism 7 to repeatedly dredge, tap and vibrate the sieve holes 402 on the circular screening conveyor belt 401, thereby effectively preventing the sieve holes 402 from clogging and chemical fertilizers from sticking, and greatly improving the screening process. Effect.

Claims (9)

1. The utility model provides a chemical fertilizer divides sieve device, includes cavity (1), its characterized in that: the utility model discloses a screening device, including cavity (1), screening drive mechanism (6) and power transmission mechanism (8), cavity (1) top is equipped with feed inlet (2), and cavity (1) bottom is equipped with a plurality of discharge gates (3), be equipped with multistage screening mechanism (4) in the inner chamber of cavity (1), multistage screening mechanism (4) are connected with each discharge gate (3) respectively through multistage discharge mechanism (5), multistage screening mechanism (4) include a plurality of horizontal parallel arrangement's annular screening conveyer belt (401), each the surface of annular screening conveyer belt (401) all is equipped with evenly distributed's sieve mesh (402), and sieve mesh (402) on annular screening conveyer belt (401) that are located the top in adjacent annular screening conveyer belt (401) are greater than sieve mesh (402) on annular screening conveyer belt (401) that are located the below, annular screening conveyer belt (401) are through screening drive mechanism (6) tensioning and connection, annular screening conveyer belt (401) are equipped with mediation mechanism (7) below the conveying face, sieve mesh mechanism (7) are connected with screening drive mechanism (6) through power transmission mechanism (8).

2. The fertilizer sizing device of claim 1, wherein: the multistage discharging mechanism (5) comprises a plurality of discharging guide plates (501) which are matched with the annular screening conveying belts (401) respectively, the discharging guide plates (501) are arranged along the conveying tail end of the annular screening conveying belts (401) in a downward inclined mode, and the lower ends of the discharging guide plates (501) are opposite to the discharging holes (3) respectively.

3. The fertilizer sizing device of claim 2, wherein: the screening driving mechanism (6) comprises a driving roller (601) and a driven roller (602), two ends of the driving roller (601) and the driven roller (602) are respectively connected with the cavity (1) in a rotating mode, and the driving roller (601) is connected with a driving motor (603) fixed outside the cavity (1).

4. A fertilizer sizing device according to claim 3, wherein: the sieve mesh dredging mechanism (7) comprises a plurality of ejection needles (701) which are matched with positions of sieve meshes (402) on the annular sieving conveying belt (401), each ejection needle (701) is respectively fixed on a plurality of mutually parallel supporting rods (702), two ends of each supporting rod (702) are respectively fixedly connected with a first moving rod (703) and a second moving rod (704) on the front side wall and the rear side wall of the cavity (1), the first moving rod (703) and the second moving rod (704) are connected with a driving roller (601) through a power transmission mechanism (8), two ends of the first moving rod (703) and the second moving rod (704) are respectively provided with a first rack (705) and a second rack (706) which are perpendicular to the conveying direction, and the first rack (705) and the second rack (706) are respectively meshed with a first gear (707) and a second gear (708) which are rotationally connected to the cavity (1).

5. The fertilizer sizing device of claim 4, wherein: the power transmission mechanism (8) comprises a first connecting rod (801) and a second connecting rod (802), one ends of the first connecting rod (801) and the second connecting rod (802) are respectively and rotatably connected with a first moving rod (703) and a second moving rod (704), the other ends of the first connecting rod (801) and the second connecting rod (802) are respectively and rotatably connected with one side of a circle center of a fluted disc I (803) and a fluted disc II (804) which are rotatably connected to the front side wall and the rear side wall of the cavity (1), and the fluted disc I (803) and the fluted disc II (804) are respectively meshed with gear rings (805) arranged at two ends of the driving roller (601).

6. The fertilizer sizing device of claim 5, wherein: and gravity hammers (709) are fixedly arranged at the end face centers of the first gear (707) and the second gear (708).

7. The fertilizer sizing device of claim 6, wherein: and one end of the discharging guide plate (501) close to the conveying end of the annular screening conveying belt (401) is abutted against the upper surface of the annular screening conveying belt (401).

8. The fertilizer sizing device of claim 1, wherein: the feeding port (2) is connected with the feeding hopper (201), an extending plate (202) which is inclined downwards is further arranged at the bottom opening of the feeding hopper (201), the extending plate (202) extends to one side opposite to the conveying direction of the annular screening conveying belt (401), a certain gap is reserved between the bottom of the extending plate (202) and the upper surface of the annular screening conveying belt (401), and a plurality of stirring rods (203) are uniformly distributed at equal intervals at the bottom of the extending plate (202).

9. The fertilizer sizing device of claim 1, wherein: each discharge gate (3) is connected with a plurality of hopper (301) respectively, and each ejection of compact stock guide (501) is close to the side that annular screening conveyer belt (401) carried the end and all rotates through pivot pin (302) and the lateral wall of cavity (1) is connected, and each ejection of compact stock guide (501) is kept away from the annular screening conveyer belt (401) and is carried respectively on backing pin (303) to carry one side of end, and the lower extreme of each ejection of compact stock guide (501) all is equipped with vibration guiding mechanism (9), vibration guiding mechanism (9) include rotation axis (901) of perpendicular to annular screening conveyer belt (401) direction of delivery, the both ends of rotation axis (901) are connected with the lateral wall rotation of cavity (1) respectively, evenly distributed a plurality of paddle boards (902) on the outer wall of rotation axis (901), rotation axis (901) are located the terminal extension line of ejection of compact stock guide (501), the lower extreme of ejection of compact stock guide (501) all is located the inboard of the circumference that each paddle board (902) is terminal.

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