Agricultural compound fertilizer manufacturing equipment

Abstract

The invention discloses agricultural compound fertilizer manufacturing equipment, and particularly relates to the technical field of compound fertilizer manufacturing, and the agricultural compound fertilizer manufacturing equipment comprises a machine body, a feeding hopper is arranged at one end of the machine body, and a multi-stage screening assembly is arranged in the machine body; the multi-stage screening assembly comprises a three-stage arc-shaped filter screen, a three-stage screening cylinder, a second-stage arc-shaped filter screen, a second-stage screening cylinder, a first-stage arc-shaped filter screen, a first-stage screening cylinder, a first-stage screening cylinder, a third-stage arc-shaped filter screen, a third-stage screening cylinder, a second-stage arc-shaped filter screen, a second-stage screening cylinder and a first-stage arc-shaped filter screen which are arranged layer by layer from inside to outside; the feeding hopper is communicated with the interior of the first-stage screening cylinder, air suction structures are arranged on the inner sides and the outer sides of the second-stage screening cylinder and the third-stage screening cylinder and the inner side of the first-stage screening cylinder correspondingly, and adsorption can be stopped when the air suction structures are located on the upper portion. Therefore, the screening of the fertilizer is finer and more efficient.

Description

Technical Field

[0001] The invention relates to the technical field of compound fertilizer manufacturing, in particular to agricultural compound fertilizer manufacturing equipment. Background Art

[0002] Compound fertilizers refer to chemical fertilizers containing two or more main nutrients (nitrogen, phosphorus, potassium). They are usually used in agricultural production to provide nutrients necessary for crop growth. The production and processing of compound fertilizers involves multiple steps, including raw material preparation, mixing, granulation, drying, cooling, screening and packaging. At present, the screening of compound fertilizers is mainly carried out through multi-stage screening through multi-stage screening to screen out compound fertilizer particles that are too large and too small. However, during the screening process, the number of compound fertilizer particles of qualified size is much larger than the number of compound fertilizer particles that are too large or too small. Therefore, during the screening process, as the compound particles fall step by step, after screening out the compound fertilizer particles with larger particles, the compound fertilizer particles of qualified size fall together with the compound fertilizer particles with too small particles. At this time, since the number of compound fertilizer particles of qualified size is much larger than the compound fertilizer particles with too small particles, and the compound fertilizer particles of qualified size are mixed together with the compound fertilizer particles with too small particles, in addition, during screening, the compound fertilizer particles of qualified size will be screened out and left on the screen cylinder, and then discharged together. Therefore, since the compound fertilizer particles of qualified size are piled up and mixed together with the compound fertilizer particles with too small particles, the compound fertilizer particles of qualified size will affect the screening of the compound fertilizer particles with smaller particles. The invention patent application with publication number "CN118950447A" specifically discloses a high-efficiency and energy-saving compound fertilizer production processing equipment, which can separate the compound fertilizer particles entering the secondary screening cylinder through a partition component to avoid the compound fertilizer particles entering the secondary screening cylinder from accumulating at the bottom, causing the qualified-sized compound fertilizer particles to affect the screening of smaller compound fertilizer particles. Although its screening efficiency is improved, due to the setting of its partition component, the fertilizer will continue to accumulate in the partition component and be screened in a relatively fixed position, so that the fertilizer will not move relative to itself. When a large amount of fertilizer accumulates in the partition component, its screening efficiency will be seriously affected. For this reason, we propose an agricultural compound fertilizer manufacturing equipment and method to solve the above problems. Summary of the Invention

[0003] The object of the present invention is to provide an agricultural compound fertilizer manufacturing equipment to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: an agricultural compound fertilizer manufacturing device, comprising a machine body, a feed hopper is provided at one end of the machine body, and a multi-stage screening component is provided inside the machine body for step-by-step screening, the multi-stage screening component comprising a three-stage curved filter screen, a three-stage screening cylinder, a two-stage curved filter screen, a two-stage screening cylinder, a one-stage curved filter screen, and a one-stage screening cylinder, which are arranged layer by layer from the inside to the outside, and the filter hole sizes on the one-stage screening cylinder, the three-stage curved filter screen, the three-stage screening cylinder, the two-stage curved filter screen, the two-stage screening cylinder, and the one-stage curved filter screen gradually increase in size from the inside to the outside, the discharge end of the feed hopper is connected to the interior of the one-stage screening cylinder, and is located between the one-stage screening cylinder and the one-stage curved filter screen, The first-stage arc filter screen, the second-stage arc filter screen, and the third-stage arc filter screen are in a downwardly concave arc shape, and can be swung back and forth on the machine body. The inner and outer sides of the secondary screening cylinder and the tertiary screening cylinder and the inner side of the primary screening cylinder are all provided with air suction structures, and the air suction structures can automatically stop adsorption when they are at the upper side. One end of the machine body is provided with a driving assembly which can drive the first-stage screening drum, the second-stage screening drum and the third-stage screening drum to rotate and the first-stage arc filter screen, the second-stage arc filter screen and the third-stage arc filter screen to swing.

[0005] Preferably, the wind suction structure is a breathable filter cloth, and a through groove is opened in the first-stage screening cylinder, the second-stage screening cylinder, and the third-stage screening cylinder from the end along the central axis direction. The inner and outer sides of the through grooves on the second-stage screening cylinder and the third-stage screening cylinder are open, and the inner side of the through groove on the first-stage screening cylinder is open, and a breathable filter cloth flush with the corresponding surfaces of the first-stage screening cylinder, the second-stage screening cylinder, and the third-stage screening cylinder is installed at the opening of the through groove.

[0006] Preferably, both ends of the first-stage screening cylinder, the second-stage screening cylinder and the third-stage screening cylinder are rotatably connected to the inner wall of the machine body, and one end of the first-stage curved filter screen, the second-stage curved filter screen and the third-stage curved filter screen is rotatably connected to the inner wall of the machine body, and the other ends of the first-stage curved filter screen, the second-stage curved filter screen and the third-stage curved filter screen are facing the discharging assembly, and the materials are discharged separately through the discharging assembly.

[0007] Preferably, an arc-shaped air inlet connecting cavity is provided inside the body, a fan assembly is installed at one end of the body, the air inlet of the fan assembly is connected to the air inlet connecting cavity, and an arc-shaped air suction groove is provided inside the body, which corresponds to and is connected to the ends of the first-stage screening cylinder, the second-stage screening cylinder, and the third-stage screening cylinder respectively, and the air suction groove is connected to the air inlet connecting cavity, and the through groove can be connected to the air inlet connecting cavity through the air suction groove.

[0008] Preferably, the other end of the discharging assembly is provided with a discharging valve assembly corresponding to and connectable with the first-stage arc filter screen, the second-stage arc filter screen, and the third-stage arc filter screen. The discharging valve assembly can be closed for discharging. A first servo motor is installed on the outside of the discharging assembly. The output shaft of the first servo motor is connected to the discharging valve assembly and can drive it to open and close.

[0009] Preferably, the driving assembly includes a transmission mechanism capable of driving the first-stage screening drum, the second-stage screening drum and the third-stage screening drum to rotate, and a linkage mechanism capable of driving the first-stage arc filter screen, the second-stage arc filter screen and the third-stage arc filter screen to swing. The transmission mechanism is connected to the ends of the first-stage screening cylinder, the second-stage screening cylinder, and the third-stage screening cylinder relative to the discharge assembly. The linkage mechanism is connected to the ends of the first-stage curved filter screen, the second-stage curved filter screen, and the third-stage curved filter screen relative to the discharge assembly. The transmission mechanism and the linkage mechanism are geared for transmission.

[0010] Preferably, the transmission mechanism includes a first internal gear ring, a complete gear, a transmission belt, an incomplete gear, and a transmission shaft. The transmission shaft is rotatably connected to the interior of the machine body. The transmission toothed belt is connected to one end of the transmission shaft. The incomplete gear is connected to the other end of the transmission shaft, and the incomplete gear is respectively located between the first-level screening cylinder, the first-level curved filter screen, the second-level screening cylinder, the second-level curved filter screen, the third-level screening cylinder, the third-level curved filter screen, and the inner side of the third-level curved filter screen. The outer side of the transmission belt is meshed with a complete gear. A second servo motor is installed at one end of the body. The output shaft of the second servo motor extends into the interior of the body and is connected to one of the complete gears. The inner sides of the primary screening cylinder, the secondary screening cylinder and the tertiary screening cylinder are all equipped with a first inner gear ring, and the inner side of the first inner gear ring can mesh with the incomplete gear.

[0011] Preferably, the linkage mechanism includes an outer gear ring, a swing ring, and a second inner gear ring. The ends of the first-stage curved filter screen, the second-stage curved filter screen and the third-stage curved filter screen relative to the discharge assembly extend into the interior of the machine body and are equipped with an annular swing ring. An outer gear ring is installed on the outer side of the swing ring, and a second inner gear ring is installed on the inner side of the swing ring. The outer gear ring and the second inner gear ring can respectively mesh with the incomplete gears on the inner and outer sides of the swing ring, and the meshing between the outer gear ring and the incomplete gear and the meshing between the second inner gear ring and the incomplete gear are in a switched meshing state.

[0012] Preferably, a circular notch recessed inward is provided in the middle of the discharge assembly near the machine body, and the discharge valve assembly is located in the circular notch and can rotate. The outer side wall of the circular notch is provided with a discharge trough with a gradually decreasing depth from the inside to the outside. The discharge troughs correspond to the third-level curved filter screen, the second-level curved filter screen, and the first-level curved filter screen one by one from the inside to the outside, and the fertilizer on them can enter the discharge trough. The discharge trough corresponding to the third-level curved filter screen is semicircular, and the discharge troughs corresponding to the second-level curved filter screen and the first-level curved filter screen are semicircular. The discharge assembly includes a discharge conduit at the bottom, and the discharge conduit is penetrated by a plurality of vertical discharge openings, and the discharge openings correspond to the discharge troughs one by one and are connected to the lowest point thereof.

[0013] Preferably, the discharge valve assembly is a discharge valve plate. The discharge valve plate is circular, and a through opening corresponding to the discharge trough is formed through the discharge valve plate. The output shaft of the first servo motor passes through the discharge assembly and is connected to the center of the discharge valve plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The agricultural compound fertilizer manufacturing equipment uses a multi-stage screening component and, with the cooperation of a wind suction structure, enables the fertilizer at the bottom layer to be driven from bottom to top, so that the fertilizer can be continuously transported upward, and then the fertilizer can fall freely and pass through the secondary screening cylinder and the tertiary screening cylinder for step-by-step screening from the outside to the inside, avoiding direct one-time screening of the fertilizer, thereby making the fertilizer screening more refined and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of a partial cross-section structure of the present invention; Figure 3 Schematic diagram of the structure of the multi-stage screening component of the present invention; Figure 4 This is a schematic diagram of the structure of the drive assembly connection in the present invention; Figure 5 Schematic diagram of the structure of the air suction trough in the present invention; Figure 6Schematic diagram of the structure of the transmission mechanism of the present invention; Figure 7 Schematic diagram of the structure of the discharge assembly in the present invention; Figure 8 Schematic diagram of the structure of the discharge valve plate in the present invention; Figure 9 2 is a schematic structural diagram of the present invention; Figure 10 It is a schematic structural diagram of B in FIG3 of the present invention; Figure 11 This is a schematic diagram of the structure of position 4C in the figure of the present invention.

[0017] In the figure: 1. Machine body; 1a. Air inlet connecting chamber; 2. Discharge assembly; 201. Discharge chute; 202. Discharge guide tube; 203. Discharge valve plate; 3. First servo motor; 4. Fan assembly; 5. Second servo motor; 601. First inner gear ring; 602. Outer gear ring; 603. Swing ring; 604. Second inner gear ring; 611. Complete gear; 612. Transmission toothed belt; 613. Incomplete gear; 614. Transmission shaft; 7. Multi-stage screening assembly; 701. First-stage screening cylinder; 702. Second-stage screening cylinder; 703. Third-stage screening cylinder; 711. First-stage curved filter screen; 712. Second-stage curved filter screen; 713. Third-stage curved filter screen; 8. Air suction trough; 9. Ventilation filter cloth. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Example: Figure 1-11 As shown, the present invention provides an agricultural compound fertilizer manufacturing device, including a body 1, a feed hopper is provided at one end of the body 1, and a multi-stage screening component 7 for screening is provided inside the body 1, the multi-stage screening component 7 includes a three-stage curved filter screen 713, a three-stage screening cylinder 703, a two-stage curved filter screen 712, a two-stage screening cylinder 702, a first-stage curved filter screen 711, and a first-stage screening cylinder 701, which are arranged layer by layer from the inside to the outside, and the filter hole sizes on the first-stage screening cylinder 701, the three-stage curved filter screen 713, the three-stage screening cylinder 703, the two-stage curved filter screen 712, the two-stage screening cylinder 702, and the first-stage curved filter screen 711 gradually increase from the inside to the outside, the discharge end of the feed hopper is connected to the interior of the first-stage screening cylinder 701, and is located between the first-stage screening cylinder 701 and the first-stage curved filter screen 711. The first-stage curved filter screen 711, the second-stage curved filter screen 712, and the third-stage curved filter screen 713 are in a downwardly concave arc shape, and can be swung back and forth on the body 1. The inner and outer sides of the secondary screening cylinder 702 and the tertiary screening cylinder 703 as well as the inner side of the primary screening cylinder 701 are all provided with air suction structures. When the air suction structures are at the upper side, the suction can be automatically stopped. One end of the machine body 1 is provided with a driving assembly that can drive the primary screening drum 701, the secondary screening drum 702, and the tertiary screening drum 703 to rotate and the primary curved filter screen 711, the secondary curved filter screen 712, and the tertiary curved filter screen 713 to swing.

[0020] It should be noted that the fertilizer is added to the first-level screening cylinder 701 through the feed hopper. The diameter of the filter holes on the first-level screening cylinder 701 is much smaller than the diameter of the fertilizer to be sorted. Therefore, the filter holes on the first-level screening cylinder 701 are ventilation components to ensure the circulation of gas. Under the action of the wind suction structure, the fertilizer at the bottom layer can be driven from bottom to top, so that the fertilizer can be continuously transported upward in parts, and then the fertilizer can fall freely and pass through the second-level screening cylinder 702 and the third-level screening cylinder 703 from the outside to the inside for step-by-step screening, avoiding the direct one-time screening of the fertilizer, thereby making the screening of the fertilizer more refined. The fallen fertilizer can be diverted again and fall into the first-level curved filter screen 711 and the second-level curved filter screen 712. The swing of the first-level curved filter screen 711 can throw the fertilizer upward and be adsorbed by the ventilation filter cloth 9 outside the second-level screening cylinder 702 and the third-level screening cylinder 703 and transported upward again, without having to pass through the outer layer of screening, thereby improving the screening efficiency. In addition, through the first-stage curved filter screen 711, the second-stage curved filter screen 712, and the third-stage curved filter screen 713, fertilizers of corresponding sizes that need to be screened can fall onto them, and then be stored there for discharge. At the same time, under the swing of the first-stage curved filter screen 711 and the second-stage curved filter screen 712, fertilizers smaller than their apertures can pass through them and fall into the first-stage screening cylinder 701, thereby achieving synchronous fertilizer screening and further accelerating the fertilizer screening efficiency. Under the action of the centrifugal force generated by the rotation of the secondary screening drum 702 and the tertiary screening drum 703, the fertilizer that cannot pass through the filter holes thereon can be thrown off, effectively avoiding the clogging of the filter holes.

[0021] It should also be noted that the first-stage curved filter screen 711, the second-stage curved filter screen 712, and the third-stage curved filter screen 713 are all conical in shape, so that the fertilizer particles can move along the conical surface after falling onto them, thereby making the discharge smoother.

[0022] Furthermore, the air suction structure is a ventilation filter cloth 9, and the first-stage screening cylinder 701, the second-stage screening cylinder 702, and the third-stage screening cylinder 703 are provided with through grooves extending from the ends along the central axis. The inner and outer sides of the through grooves on the second-stage screening cylinder 702 and the third-stage screening cylinder 703 are open, and the inner side of the through groove on the first-stage screening cylinder 701 is open. The ventilation filter cloth 9 is installed at the opening of the through groove, which is flush with the corresponding surfaces of the first-stage screening cylinder 701, the second-stage screening cylinder 702, and the third-stage screening cylinder 703.

[0023] It should be noted that, through the negative pressure generated in the through groove, the ventilation filter cloth 9 can generate negative pressure to adsorb the fertilizer on the ventilation filter cloth 9, so that the fertilizer can be smoothly adsorbed on the ventilation filter cloth 9 and transported upward. The gap on the ventilation filter cloth 9 is much smaller than the diameter of the fertilizer particles, so the fertilizer will not pass through the ventilation filter cloth 9 and be driven by the ventilation filter cloth 9.

[0024] Furthermore, the two ends of the first-stage screening cylinder 701, the second-stage screening cylinder 702, and the third-stage screening cylinder 703 are respectively rotatably connected to the inner wall of the body 1, and one end of the first-stage curved filter screen 711, the second-stage curved filter screen 712, and the third-stage curved filter screen 713 is rotatably connected to the inner wall of the body 1, and the other ends of the first-stage curved filter screen 711, the second-stage curved filter screen 712, and the third-stage curved filter screen 713 are facing the discharge component 2, and are discharged separately through the discharge component 2.

[0025] It should be noted that the fertilizers on the first-stage curved filter screen 711 , the second-stage curved filter screen 712 , and the third-stage curved filter screen 713 can be moved toward the discharge assembly 2 , so as to be discharged separately through the discharge assembly 2 .

[0026] Specifically, an arc-shaped air inlet connecting chamber 1a is provided inside the body 1, a fan assembly 4 is installed at one end of the body 1, and the air inlet of the fan assembly 4 is connected to the air inlet connecting chamber 1a, and an arc-shaped air suction groove 8 is provided inside the body 1, which corresponds to and is connected to the ends of the first-stage screening cylinder 701, the second-stage screening cylinder 702, and the third-stage screening cylinder 703 respectively, and the air suction groove 8 is connected to the air inlet connecting chamber 1a, and the through groove can be connected to the air inlet connecting chamber 1a through the air suction groove 8.

[0027] It should be noted that, by exhausting air through the fan assembly 4 and through the air inlet connecting cavity 1a and the air suction groove 8, the through groove can be exhausted, thereby achieving the effect of the air-permeable filter cloth 9 adsorbing the fertilizer, and when the through groove is turned to the top, it is separated from the state of being connected to the air suction groove 8, so that the fertilizer is in a state of contact and adsorption, so that the fertilizer can fall automatically.

[0028] On the other hand, the other end of the discharging component 2 is provided with a discharging valve component corresponding to and connectable with the first-stage arc filter screen 711, the second-stage arc filter screen 712, and the third-stage arc filter screen 713. The discharging valve component can be closed for discharging. A first servo motor 3 is installed on the outside of the discharging component 2. The output shaft of the first servo motor 3 is connected to the discharging valve component and can drive it to open and close.

[0029] It should be noted that, driven by the output shaft of the first servo motor 3, the discharge valve assembly can be opened, so that the fertilizer can be discharged smoothly. When the fertilizer is screened, the discharge valve assembly is in a closed state to avoid the direct discharge of the fertilizer affecting its screening accuracy.

[0030] Specifically, the driving assembly includes a transmission mechanism that can drive the first-stage screening drum 701, the second-stage screening drum 702, and the third-stage screening drum 703 to rotate, and a linkage mechanism that can drive the first-stage curved filter screen 711, the second-stage curved filter screen 712, and the third-stage curved filter screen 713 to swing. The transmission mechanism is connected to the ends of the first-stage screening cylinder 701, the second-stage screening cylinder 702, and the third-stage screening cylinder 703 that are opposite to the discharge assembly 2. The linkage mechanism is connected to the ends of the first-stage curved filter screen 711, the second-stage curved filter screen 712, and the third-stage curved filter screen 713 relative to the discharge assembly 2. The transmission mechanism and the linkage mechanism are geared for transmission.

[0031] Specifically, the transmission mechanism includes a first internal gear ring 601, a complete gear 611, a transmission belt 612, an incomplete gear 613, and a transmission shaft 614. The transmission shaft 614 is rotatably connected to the interior of the body 1. The transmission belt 612 is connected to one end of the transmission shaft 614. The incomplete gear 613 is connected to the other end of the transmission shaft 614. The incomplete gear 613 is located between the first-stage screening cylinder 701, the first-stage curved filter screen 711, the second-stage screening cylinder 702, the second-stage curved filter screen 712, the third-stage screening cylinder 703, the third-stage curved filter screen 713, and inside the third-stage curved filter screen 713. The outer side of the transmission belt 612 is meshed with a complete gear 611. A second servo motor 5 is installed at one end of the body 1. The output shaft of the second servo motor 5 extends into the interior of the body 1 and is connected to one of the complete gears 611. The incomplete gear 613 can intermittently mesh with the first inner gear ring 601.

[0032] The first screening cylinder 701 , the second screening cylinder 702 , and the third screening cylinder 703 are all installed with a first inner gear ring 601 on their inner sides. The inner side of the first inner gear ring 601 can mesh with the incomplete gear 613 .

[0033] It should be noted that, driven by the output shaft of the second servo motor 5, the complete gear 611 can rotate, and under the transmission of the complete gear 611, the transmission belt 612 can rotate synchronously in the same direction. Under the transmission of the transmission shaft 614, the incomplete gear 613 can rotate synchronously in the same direction, and driven by the incomplete gear 613, the first inner gear ring 601 is driven to rotate. When the incomplete gear 613 disengages from the first inner gear ring 601, the first inner gear ring 601 stops rotating, and then the intermittent rotation of the first-stage screening drum 701, the second-stage screening drum 702, and the third-stage screening drum 703 is realized. The intermittent rotation of the second-stage screening drum 702 and the third-stage screening drum 703 can generate vibration, and the fertilizer thereon can effectively reduce the clogging of the filter holes under the action of inertia.

[0034] Specifically, the linkage mechanism includes an outer gear ring 602, a swing ring 603, and a second inner gear ring 604. The first-stage curved filter screen 711, the second-stage curved filter screen 712, and the third-stage curved filter screen 713 extend into the interior of the machine body 1 relative to the end of the discharge assembly 2, and are equipped with an annular swing ring 603. An outer gear ring 602 is installed on the outer side of the swing ring 603, and a second inner gear ring 604 is installed on the inner side of the swing ring 603. The outer gear ring 602 and the second inner gear ring 604 can respectively mesh with the incomplete gears 613 on the inner and outer sides of the swing ring 603, and the meshing between the outer gear ring 602 and the incomplete gear 613 and the meshing between the second inner gear ring 604 and the incomplete gear 613 are in a switched meshing state.

[0035] It should be noted that the switched meshing state is the state in which the incomplete gear 613 is disengaged from the second inner gear ring 604, and the swinging ring 603 is just in meshing with the incomplete gear 613. When the incomplete gear 613 is meshing with the second inner gear ring 604, the swinging ring 603 is just disengaged from the incomplete gear 613, thereby enabling the swinging ring 603 to swing back and forth. Through its swinging, the screening effects of the first-stage arc filter screen 711, the second-stage arc filter screen 712, and the third-stage arc filter screen 713 are better.

[0036] Furthermore, a circular notch is provided in the middle of the discharge assembly 2 near the side of the machine body 1, and the discharge valve assembly is located in the circular notch and can rotate. The outer side wall of the circular notch is provided with a discharge trough 201 with a gradually decreasing depth from the inside to the outside. The discharge trough 201 corresponds to the third-level curved filter screen 713, the second-level curved filter screen 712, and the first-level curved filter screen 711 from the inside to the outside, and the fertilizer on them can enter the discharge trough 201. The discharge trough 201 corresponding to the third-level curved filter screen 713 is semicircular, and the discharge trough 201 corresponding to the second-level curved filter screen 712 and the first-level curved filter screen 711 is semicircular. The discharge assembly 2 includes a discharge conduit 202 at the bottom. The discharge conduit 202 is provided with a plurality of vertical discharge openings. The discharge openings correspond to the discharge trough 201 one by one and are connected to the lowest point thereof.

[0037] Specifically, the discharge valve assembly is a discharge valve plate 203. The discharge valve plate 203 is circular and has a through opening corresponding to the discharge trough 201 . The output shaft of the first servo motor 3 passes through the discharge assembly 2 and is connected to the center of the discharge valve plate 203 .

[0038] It should be noted that, driven by the output shaft of the second servo motor 5, the discharge valve plate 203 can rotate. When the discharge trough 201 coincides with the through port, the discharge trough 201 is connected to the interior of the machine body 1. When the discharge trough 201 does not coincide with the through port, the discharge trough 201 is in a closed state.

[0039] In summary, when the agricultural compound fertilizer manufacturing equipment is in use, the fertilizer is added to the top of the first-stage screening drum 701 through the feed hopper. At this time, under the drive of the output shaft of the second servo motor 5, the complete gear 611 rotates, and through the transmission of the transmission toothed belt 612, all the complete gears 611 rotate. Driven by the complete gear 611, the transmission shaft 614 can rotate, and then drive the incomplete gear 613 to rotate. When the incomplete gear 613 rotates, the incomplete gear 613 can mesh with the first inner gear ring 601 and drive the first inner gear ring 601 to rotate. When the incomplete gear 613 disengages from the first inner gear ring 601, the first inner gear ring 601 stops rotating, and then the intermittent rotation of the first-stage screening drum 701, the second-stage screening drum 702, and the third-stage screening drum 703 is realized. When the incomplete gear 613 is meshed with the outer gear ring 602, the outer gear ring 602 can be driven to drive the swing ring 603 to rotate. At this time, the incomplete gear 613 is out of meshing with the second inner gear ring 604. When the incomplete gear 613 is meshed with the second inner gear ring 604, the swing ring 603 is just out of meshing with the incomplete gear 613, and then the second inner gear ring 604 can drive the swing ring 603 to rotate in the opposite direction of the outer gear ring 602. Then, through the transmission of the swing ring 603, the third-stage arc filter screen 713, the second-stage arc filter screen 712, and the first-stage arc filter screen 711 can generate a back-and-forth swinging motion trend. When the first-stage screening drum 701, the second-stage screening drum 702, and the third-stage screening drum 703 rotate, they are connected with the through slot and the air suction slot 8. At this time, the fan assembly 4 sucks air into the through slot through the air inlet connecting cavity 1a, and the negative pressure generated thereby adsorbs the fertilizer on the ventilation filter cloth 9. Driven by the adsorption of the ventilation filter cloth 9, the fertilizer is driven from bottom to top. When the through slot moves to the top, the through slot is disconnected from the air suction slot 8, and the negative pressure disappears. The fertilizer adsorbed on the ventilation filter cloth 9 falls under the action of gravity and is screened step by step from top to bottom by the second-stage screening drum 702 and the third-stage screening drum 703. The unscreened fertilizer that falls on the first-stage curved filter screen 711 and the second-stage curved filter screen 712 is thrown upward by the swing of the first-stage curved filter screen 711 and is adsorbed by the ventilated filter cloth 9, transported upward again, and falls down for screening. The sieved fertilizer falls to the third-stage curved filter screen 713, the second-stage curved filter screen 712, the first-stage curved filter screen 711, and then leads to the discharge chute 201. Driven by the output shaft of the first servo motor 3 , the discharge valve plate 203 can rotate and the opening thereon is connected to the discharge chute 201 , so that the fertilizer can enter the discharge port from the discharge chute 201 for separate discharge.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An agricultural compound fertilizer manufacturing device, comprising a machine body (1), a feed hopper being provided at one end of the machine body (1), and a multi-stage screening assembly (7) for screening step by step being provided inside the machine body (1), characterized in that: The multi-stage screening assembly (7) comprises a three-stage curved filter screen (713), a three-stage screening cylinder (703), a two-stage curved filter screen (712), a two-stage screening cylinder (702), a one-stage curved filter screen (711), and a one-stage screening cylinder (701), which are arranged layer by layer from the inside to the outside. The filter holes on the one-stage screening cylinder (701), the three-stage curved filter screen (713), the three-stage screening cylinder (703), the two-stage curved filter screen (712), the two-stage screening cylinder (702), and the one-stage curved filter screen (711) gradually increase in size from the inside to the outside. The discharge end of the feed hopper is connected to the interior of the one-stage screening cylinder (701) and is located between the one-stage screening cylinder (701) and the one-stage curved filter screen (711). The first-stage curved filter screen (711), the second-stage curved filter screen (712), and the third-stage curved filter screen (713) are in a downwardly concave arc shape, and can be placed on the machine body (1) and swing back and forth; The inner and outer sides of the secondary screening cylinder (702) and the tertiary screening cylinder (703) as well as the inner side of the primary screening cylinder (701) are all provided with air suction structures, and the air suction structures can automatically stop adsorption when they are at the upper side; One end of the machine body (1) is provided with a driving assembly capable of driving the first-stage screening drum (701), the second-stage screening drum (702), and the third-stage screening drum (703) to rotate and the first-stage curved filter screen (711), the second-stage curved filter screen (712), and the third-stage curved filter screen (713) to swing.

2. The agricultural compound fertilizer manufacturing equipment according to claim 1, characterized in that: The air suction structure is a ventilation filter cloth (9), and a through groove is provided in the first-stage screening cylinder (701), the second-stage screening cylinder (702), and the third-stage screening cylinder (703) from the end portion along the central axis direction. The inner and outer sides of the through grooves on the second-stage screening cylinder (702) and the third-stage screening cylinder (703) are both open-shaped. The inner side of the through groove on the first-stage screening cylinder (701) is open-shaped. The ventilation filter cloth (9) is installed at the opening of the through groove and is flush with the corresponding surfaces of the first-stage screening cylinder (701), the second-stage screening cylinder (702), and the third-stage screening cylinder (703).

3. The agricultural compound fertilizer manufacturing equipment according to claim 2, characterized in that: The two ends of the first-stage screening cylinder (701), the second-stage screening cylinder (702), and the third-stage screening cylinder (703) are respectively rotatably connected to the inner wall of the machine body (1); one end of the first-stage curved filter screen (711), the second-stage curved filter screen (712), and the third-stage curved filter screen (713) is rotatably connected to the inner wall of the machine body (1); and the other ends of the first-stage curved filter screen (711), the second-stage curved filter screen (712), and the third-stage curved filter screen (713) are directly facing the discharge assembly (2), and are discharged separately through the discharge assembly (2).

4. The agricultural compound fertilizer production equipment according to claim 3, characterized in that: An arc-shaped air inlet connecting cavity (1a) is provided inside the machine body (1), a fan assembly (4) is installed at one end of the machine body (1), and an air inlet of the fan assembly (4) is connected to the air inlet connecting cavity (1a). An arc-shaped air suction groove (8) is provided inside the machine body (1), which corresponds to and is connected to the ends of the first-stage screening cylinder (701), the second-stage screening cylinder (702), and the third-stage screening cylinder (703), respectively. The air suction groove (8) is connected to the air inlet connecting cavity (1a), and the through groove can be connected to the air inlet connecting cavity (1a) through the air suction groove (8).

5. The agricultural compound fertilizer manufacturing equipment according to claim 4, characterized in that: The other end of the discharge assembly (2) is provided with a discharge valve assembly corresponding to and connectable with the first-stage curved filter screen (711), the second-stage curved filter screen (712), and the third-stage curved filter screen (713). The discharge valve assembly can be closed to discharge the material. A first servo motor (3) is installed on the outside of the discharge assembly (2). The output shaft of the first servo motor (3) is connected to the discharge valve assembly and can drive it to open and close.

6. The agricultural compound fertilizer manufacturing equipment according to claim 5, characterized in that: The driving assembly comprises a transmission mechanism capable of driving the first-stage screening drum (701), the second-stage screening drum (702), and the third-stage screening drum (703) to rotate, and a linkage mechanism capable of driving the first-stage curved filter screen (711), the second-stage curved filter screen (712), and the third-stage curved filter screen (713) to swing; The transmission mechanism is connected to the ends of the first-stage screening cylinder (701), the second-stage screening cylinder (702), and the third-stage screening cylinder (703) relative to the discharge assembly (2); The linkage mechanism is connected to the ends of the first-stage curved filter screen (711), the second-stage curved filter screen (712), and the third-stage curved filter screen (713) relative to the discharge assembly (2); The transmission mechanism and the linkage mechanism are geared for transmission.

7. The agricultural compound fertilizer production equipment according to claim 6, characterized in that: The transmission mechanism comprises a first internal gear ring (601), a complete gear (611), a transmission toothed belt (612), an incomplete gear (613), and a transmission shaft (614); The transmission shaft (614) is rotatably connected to the interior of the machine body (1); The transmission toothed belt (612) is connected to one end of the transmission shaft (614); The incomplete gear (613) is connected to the other end of the transmission shaft (614), and the incomplete gear (613) is respectively located between the first-stage screening cylinder (701), the first-stage curved filter screen (711), the second-stage screening cylinder (702), the second-stage curved filter screen (712), the third-stage screening cylinder (703), the third-stage curved filter screen (713), and inside the third-stage curved filter screen (713); The outer sides of the transmission toothed belt (612) are meshed with a complete gear (611); a second servo motor (5) is mounted on one end of the machine body (1); an output shaft of the second servo motor (5) extends into the interior of the machine body (1) and is connected to one of the complete gears (611); The first-stage screening cylinder (701), the second-stage screening cylinder (702), and the third-stage screening cylinder (703) are all installed with a first inner gear ring (601) on their inner sides, and the inner side of the first inner gear ring (601) can mesh with the incomplete gear (613).

8. The agricultural compound fertilizer production equipment according to claim 7, characterized in that: The linkage mechanism comprises an outer gear ring (602), a swinging ring (603), and a second inner gear ring (604); The ends of the first-stage curved filter screen (711), the second-stage curved filter screen (712), and the third-stage curved filter screen (713) relative to the discharge assembly (2) extend into the interior of the machine body (1) and are equipped with an annular swing ring (603); An outer gear ring (602) is installed on the outer side of the swing ring (603), and a second inner gear ring (604) is installed on the inner side of the swing ring (603); The outer gear ring (602) and the second inner gear ring (604) can respectively mesh with the incomplete gears (613) on the inner and outer sides of the swing ring (603), and the meshing between the outer gear ring (602) and the incomplete gear (613) and the meshing between the second inner gear ring (604) and the incomplete gear (613) are in a switched meshing state.

9. The agricultural compound fertilizer production equipment according to claim 8, characterized in that: A circular notch recessed inward is provided in the middle of the discharge assembly (2) on one side close to the machine body (1), and the discharge valve assembly is located in the circular notch and is rotatable; A discharge trough (201) with a gradually decreasing depth is provided on the outer side wall of the circular notch. The discharge troughs (201) correspond to the third-stage curved filter screen (713), the second-stage curved filter screen (712), and the first-stage curved filter screen (711) from the inside to the outside, and fertilizer on the discharge troughs (201) can enter the discharge troughs (201). The discharge trough (201) corresponding to the third-stage curved filter screen (713) is semicircular, and the discharge troughs (201) corresponding to the second-stage curved filter screen (712) and the first-stage curved filter screen (711) are semicircular. The discharge assembly (2) comprises a discharge conduit (202) at the bottom, wherein the discharge conduit (202) is provided with a plurality of vertical discharge openings, and the discharge openings correspond to the discharge trough (201) one by one and are connected to the lowest point thereof.

10. The agricultural compound fertilizer production equipment according to claim 9, characterized in that: The discharge valve assembly is a discharge valve plate (203); The discharge valve plate (203) is circular, and a through opening corresponding to the discharge trough (201) is formed through the discharge valve plate (203). The output shaft of the first servo motor (3) passes through the discharge assembly (2) and is connected to the center of the discharge valve plate (203).

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