A seeding synchronous screw fertilizer applicator and screw fertilizer applicator mechanism

Abstract

The application discloses a kind of sowing synchronous screw rod fertilizer distributor and screw rod fertilizer mechanism, and is equipped with spiral conduit in the lower end of fertilizer tank, is equipped with fertilizing screw in spiral conduit, is equipped with discharge nozzle in the lower end of spiral conduit, is equipped with inlet in the top end of spiral conduit, is equipped with discharge port in the bottom end of spiral conduit, inlet is communicated with fertilizer tank, discharge port is communicated with discharge nozzle;The inner wall of spiral conduit inner cavity is double-line spiral surface, and fertilizing screw is eccentric screw body, the lead of spiral conduit is twice of fertilizing screw pitch, the cross section of spiral conduit inner cavity is waist-shaped hole, the diameter of semicircle in both ends of waist-shaped hole is fertilizing screw diameter, and the straight line segment distance of waist-shaped hole is equal to four times fertilizing screw eccentric distance;Fertilizing screw is engaged rotation in spiral conduit inner cavity, is rotated around itself axis on one hand, and it is rolled along the surface of spiral conduit inner cavity waist-shaped hole on the other hand, and sealed chamber is formed between spiral conduit and fertilizing screw, and fertilizer in sealed chamber is pushed forward one pitch per rotation of fertilizing screw, and finally extruded from discharge port.The application can be suitable for granular and powdery fertilizer, paste fertilizer, liquid fertilizer and other fertilizer fertilization, and fertilizer is uniform, pressure is stable, and precision is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of agricultural machinery, in particular to a sowing synchronous screw fertilizer applicator and screw fertilizer application mechanism. BACKGROUND

[0002] Fertilization refers to the application of fertilizers to the soil or spraying on plants to provide nutrients required by plants and maintain and improve soil fertility. The main purpose of fertilization is to increase crop yield, improve crop quality, cultivate soil fertility and improve economic benefits. Fertilizers can be divided into three categories: organic fertilizers, inorganic fertilizers and biological fertilizers. Organic fertilizer: also known as farmyard manure, refers to a fertilizer containing a large amount of organic matter, such as cake fertilizer, green manure, compost, livestock manure, etc. Inorganic fertilizer: also known as chemical fertilizer, which has many types, common ones are nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, etc. Biological fertilizer: also known as bacterial fertilizer, simply referred to as bacterial fertilizer, refers to some beneficial microorganisms for agricultural production which are artificially isolated and cultured to produce fertilizers. Fertilizers can be divided into granular and powdery fertilizers, paste fertilizers, liquid fertilizers, and gas fertilizers according to their states. Liquid fertilizer, simply referred to as liquid fertilizer, is a fertilizer without a certain shape and in a flowing state. It includes clear liquid type and suspension type. China mainly produces clear liquid type liquid fertilizer, such as different concentrations of ammonium phosphate solution produced by neutralizing liquid ammonia with phosphoric acid, superphosphoric acid and polyphosphoric acid, which is a commonly used liquid fertilizer. If other nitrogen fertilizers, potassium chloride and trace elements are dissolved in it at appropriate proportions, multi-element liquid compound fertilizer can be produced. Sometimes herbicides, pesticides and fungicides can also be added to liquid fertilizer to produce multifunctional liquid fertilizer. The advantages of liquid fertilizer are lower production cost, easy irrigation and fertilization, but it needs corresponding supporting equipment for transportation, storage and application.

[0003] The existing fertilization equipment can only be used for granular and powdery fertilizers and paste fertilizers, and cannot be used for liquid fertilizers. In order to solve the above problems, it is urgent to develop a fertilizer applicator that can be used for granular and powdery fertilizers, paste fertilizers and liquid fertilizers, and has uniform fertilization, stable pressure and high precision. SUMMARY

[0004] Therefore, the present application provides a sowing synchronous screw fertilizer applicator and screw fertilizer application mechanism which can be used for granular and powdery fertilizers, paste fertilizers and liquid fertilizers, and has uniform fertilization, stable pressure and high precision.

[0005] In one aspect, the present application provides a screw fertilizer application mechanism, a spiral guide pipe is installed at the lower end of the fertilizer box, a fertilizer screw is installed in the spiral guide pipe, a discharge nozzle is installed at the lower end of the spiral guide pipe, an inlet is formed at the top end of the spiral guide pipe, and a discharge port is formed at the bottom end of the spiral guide pipe. The inlet communicates with the fertilizer box, and the discharge port communicates with the discharge nozzle.

[0006] The inner wall of the inner cavity of the spiral conduit is a double helical surface, the fertilizer screw rod is an eccentric screw rod, the lead of the spiral conduit is twice the pitch of the fertilizer screw rod, the cross section of the inner cavity of the spiral conduit is a waist-shaped hole, the diameter of the semicircle at both ends of the waist-shaped hole is the diameter D1 of the fertilizer screw rod, and the linear segment distance H3 of the waist-shaped hole is equal to four times the eccentric distance H1 of the fertilizer screw rod.

[0007] In the non-fertilizing state, in order to prevent fertilizer leakage from the discharge port and improve the fertilizing speed and accuracy of the discharge port, in a further technical solution, the area of the inlet port and the area of the waist-shaped hole are both greater than twice the area of the discharge port, the diameter D1 of the fertilizer screw rod is equal to the diameter D2 of the discharge port, and the eccentric distance H2 of the discharge port is equal to the eccentric distance H1 of the fertilizer screw rod; the fertilizer screw rod rotates once per revolution, and the lower end of the fertilizer screw rod is reset to the discharge port to close it, and the discharge port is closed and opened in a cycle once.

[0008] In a further technical solution, the cross section of the fertilizer screw rod is a special shape, which includes a circular arc segment greater than 180 degrees and a linear segment, and the diameter of the circular arc segment is D1.

[0009] In order to realize the rotation of the fertilizer screw rod around its own axis and the rolling of the fertilizer screw rod along the surface of the waist-shaped hole in the inner cavity of the spiral conduit, in a further technical solution, a fertilizer motor, a first universal joint, a second universal joint, a transmission shaft and a stirring hose are installed in the fertilizer box, the first universal joint is connected with the fertilizer motor, the second universal joint is connected with the fertilizer screw rod, the transmission shaft is connected with the first universal joint and the second universal joint at both ends, the stirring hose is connected with the transmission shaft, and the fertilizer motor drives the first universal joint, the transmission shaft, the second universal joint, the fertilizer screw rod and the stirring hose to rotate in sequence.

[0010] In order to realize the integrated operation of walking, ditching, fertilizing, seeding, covering and compacting, on the other hand, the application also provides a synchronous screw rod fertilizer machine for seeding, which comprises the above-mentioned screw rod fertilizing mechanism, the screw rod fertilizing mechanism is installed on a frame, a ground wheel and a ditcher are installed in front of the screw rod fertilizing mechanism, a seeder is installed behind the screw rod fertilizing mechanism, a covering plate is installed behind the seeder, a soil compaction wheel mechanism is installed behind the covering plate, and a clamping mechanism is installed on the mechanism.

[0011] In a further technical solution, the soil compaction wheel mechanism comprises a pressure wheel support, a pressure wheel and a pressure wheel return spring, the pressure wheel is installed on the pressure wheel support, the pressure wheel support is hinged to the frame, and the pressure wheel return spring is connected with the pressure wheel support and the frame at both ends.

[0012] In order to make the seeding synchronous screw fertilizer machine of the application can be hung on the rotary tillage ridger, the ground wheel rotates with the rotary tillage ridger. In a further technical solution, the clamping mechanism includes a hinged plate, a first connecting rod, a second connecting rod, a clamping part, and a clamping reset spring. The hinged plate is connected to the frame, and the hinged plate, the first connecting rod, the second connecting rod, and the clamping part are connected to form a parallelogram mechanism. The two ends of the clamping reset spring are connected to the two opposite hinged points of the parallelogram mechanism.

[0013] In a further technical solution, a seeding motor is installed on the seeder. The seeder sows the number of seeds corresponding to the number of seed slots of the seeding wheel per revolution of the seeding motor. The seeding amount can be controlled according to requirements.

[0014] In order to accurately control the fertilizer application amount and the seeding amount, the seeding motor and the fertilizer motor are synchronously operated. In a further technical solution, a controller, a sensor module, a motor drive module, and a user interface module are included. The sensor module includes a first sensor, a second sensor, and a third sensor. The motor drive module is used to drive the seeding motor and the fertilizer motor. The user interface module displays the working state in real time and sets the fertilizer and seeding parameters. The first sensor is installed on the frame and monitors the rotation angle of the ground wheel in real time. The second sensor is installed on the screw fertilizer mechanism and monitors the rotation angle of the fertilizer screw in real time. The third sensor is installed on the seeder and monitors the rotation angle of the seeding motor in real time.

[0015] The controller collects the signals of the first sensor, the second sensor, and the third sensor. According to the rotation angle of the ground wheel collected by the first sensor and the fertilizer and seeding parameters, the motor drive module is used to drive the seeding motor and the fertilizer motor to operate synchronously. Feedback control is realized by using the signals of the second sensor and the third sensor.

[0016] In the non-fertilization state, fertilizer leakage is prevented. In a further technical solution, in the non-fertilization state, the controller controls the fertilizer motor to drive the lower end of the fertilizer screw to reset to the discharge port to close it according to the rotation angle of the fertilizer screw collected by the second sensor.

[0017] The seeding synchronous screw fertilizer machine and the screw fertilizer mechanism of the application have the following advantages over the prior art:

[0018] The screw fertilizer mechanism of the application can be used for granular and powdery fertilizer, paste fertilizer, liquid fertilizer, etc. The fertilizer is evenly applied, the pressure is stable, and the accuracy is high.

[0019] The screw fertilizer mechanism of the application has an inlet area and a waist-shaped hole area which are more than twice of the outlet area, and the diameter D1 of the fertilizer screw is equal to the diameter D2 of the outlet; the lower end of the fertilizer screw returns to the outlet to close it once per rotation of the fertilizer screw, and the outlet is closed and opened in a cycle.

[0020] The seeding synchronous screw fertilizer machine of the application can realize the integrated operation of walking, ditching, fertilizing, seeding, covering and compacting, accurately control the fertilizing and seeding amount, and realize the synchronous operation of the seeding motor and the fertilizing motor. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application, and are incorporated herein for explanation by reference. Such drawings are not to be considered as limiting the scope of the present application. In the drawings:

[0022] Figure 1 A perspective view of a seeding synchronous screw fertilizer machine of the application;

[0023] Figure 2 A front view of the seeding synchronous screw fertilizer machine; Figure 1

[0024] Figure 3 A structure schematic view of the fertilizer screw of the screw fertilizer mechanism of the first embodiment of the application in a 90-degree rotation state;

[0025] Figure 4 A structure schematic view of the fertilizer screw of the first embodiment of the application in a 0-degree state;

[0026] Figure 5 A structure schematic view of the fertilizer screw of the first embodiment of the application in a 180-degree rotation state;

[0027] Figure 6 A A sectional view of the seeding synchronous screw fertilizer machine; Figure 4

[0028] A structure schematic view of the inlet of the seeding synchronous screw fertilizer machine; Figure 7 Figure 4 A structure schematic view of the outlet of the seeding synchronous screw fertilizer machine;

[0029] Figure 8 Figure 4 A structure schematic view of the screw fertilizer mechanism of the second embodiment of the application;

[0030] Figure 9 A structure schematic view of the screw fertilizer mechanism of the second embodiment of the application;

[0031] Figure 10 ​​​A schematic view of a fertilizing screw structure of a second embodiment of the present application is shown in the figure;

[0032] Figure 11 A B-B sectional view of the fertilizing screw structure of the second embodiment of the present application is shown in the figure; Figure 10

[0033] Figure 12 A schematic view of a control system of a seeding synchronous screw fertilizer machine is shown in the figure. DETAILED DESCRIPTION

[0034] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] As shown in the figures, Figure 1 and Figure 2 the present application preferably provides a seeding synchronous screw fertilizer machine, a clamping mechanism 2 is installed on a frame 100, and the clamping mechanism 2 is hung on a rotary tillage ridger. A screw fertilizer mechanism 3 is installed on the frame 100, a land wheel 1 and an opener 7 are installed in front of the screw fertilizer mechanism 3, a seeder 4 is installed behind the screw fertilizer mechanism 3, a cover plate 6 is installed behind the seeder 4, and a soil pressing wheel mechanism 5 is installed behind the cover plate 6. The rotary tillage ridger drives the seeding synchronous screw fertilizer machine to walk, the land wheel 1 rotates with the walking of the rotary tillage ridger, the opener 7 opens a ditch in the soil, the screw fertilizer mechanism 3 accurately fertilizes in the ditch, the seeder 4 seeds in the ditch, the cover plate 6 covers the surrounding soil in the ditch, and finally the soil pressing wheel mechanism 5 compacts the soil, realizing the integrated operation of walking, ditching, fertilizing, seeding, covering, and compacting.

[0036] As shown in the figures, Figure 2 the soil pressing wheel mechanism 5 includes a pressure wheel support 51, a pressure wheel 50, and a pressure wheel return spring 52, the pressure wheel 50 is installed on the pressure wheel support 51, the pressure wheel support 51 is hinged to the frame 100, and the two ends of the pressure wheel return spring 52 are connected to the pressure wheel support 51 and the frame 100 respectively. The pressure wheel 50 compacts the soil under the action of the pressure wheel return spring 52, makes the land flat, and compacts the soil uniformly.

[0037] As shown in the figures, Figure 2 the clamping mechanism 2 includes a hinged plate 20, a first connecting rod 21, a second connecting rod 22, a clamping part 23, and a clamping return spring 24, the hinged plate 20 is connected to the frame 100, the hinged plate 20, the first connecting rod 21, the second connecting rod 22, and the clamping part 23 are connected to each other to form a parallelogram mechanism, and the two ends of the clamping return spring 24 are connected to the two hinged points of the opposite sides of the parallelogram mechanism. When the land wheel 1 walks on uneven land, the parallelogram mechanism makes the seeding synchronous screw fertilizer machine vertically lift, and the machine does not tilt when walking, and the clamping return spring 24 can quickly reset the parallelogram mechanism. ​

[0038] As Figure 1 shown, the seeder 4 is installed with a seeding motor 40, and the seeding motor 40 seeds three seeds per rotation.

[0039] As Figure 3 and Figure 4 and Figure 5 shown, the application preferably has a screw fertilizer mechanism 3 of the first embodiment, a fertilizer motor 31 is installed in the fertilizer tank 30, a first universal joint 32 is connected with the fertilizer motor 31, a second universal joint 34 is connected with the fertilizer screw 35, a transmission shaft 33 is connected with the first universal joint 32 and the second universal joint 34 at both ends respectively, and a stirring hose 8 is connected with the transmission shaft 33. The fertilizer motor 31 drives the first universal joint 32, the transmission shaft 33, the second universal joint 34, the fertilizer screw 35 and the stirring hose 8 to rotate in turn. A spiral conduit 36 is installed at the lower end of the fertilizer tank 30, the fertilizer screw 35 is installed in the spiral conduit 36, a discharge nozzle 37 is installed at the lower end of the spiral conduit 36, an inlet 360 is opened at the top end of the spiral conduit 36, and a discharge outlet 361 is opened at the bottom end of the spiral conduit 36. The inlet 360 is communicated with the fertilizer tank 30, and the discharge outlet 361 is communicated with the discharge nozzle 37. The stirring hose 8 stirs the fertilizer in the fertilizer tank 30 to make the fertilizer quickly enter the spiral conduit 36.

[0040] As Figure 6 shown, the inner wall of the inner cavity of the spiral conduit 36 is a double-line spiral surface, the fertilizer screw 35 is an eccentric spiral body screw, the lead of the spiral conduit 36 is twice the pitch of the fertilizer screw 35, the cross section of the inner cavity of the spiral conduit 36 is a waist-shaped hole 363, the diameters of the semicircles at both ends of the waist-shaped hole 363 are D1, the linear segment distance H3 of the waist-shaped hole 363 is equal to four times the eccentric distance H1 of the fertilizer screw 35, the fertilizer screw 35 meshes and rotates in the inner cavity of the spiral conduit 36, on one hand, it rotates around its own axis, on the other hand, it rolls along the surface of the waist-shaped hole 363 of the inner cavity of the spiral conduit 36. A sealed cavity 362 is formed between the spiral conduit 36 and the fertilizer screw 35, and the fertilizer in the sealed cavity 362 is pushed forward by one pitch per rotation of the fertilizer screw 35, and finally extruded out of the discharge outlet 361. If the meshing precision of the fertilizer screw 35 and the spiral conduit 36 is high, and the sealing performance of the sealed cavity 362 is good, the liquid fertilizer is not easy to leak downward, therefore, the screw fertilizer mechanism of the application can be applied to granular and powdery fertilizer, paste fertilizer, liquid fertilizer and other fertilizer fertilization, and the fertilization is uniform, the pressure is stable, and the precision is high.

[0041] As Figure 7 and Figure 8As shown, due to the uneven land in the work of the seeding synchronous screw fertilizer machine, the seeding synchronous screw fertilizer machine oscillates up and down, and there is a gap between the fertilizing screw 35 and the spiral guide pipe 36, which causes the liquid fertilizer to leak from the discharge port 361 during the working process of the screw fertilizer mechanism 3. In order to solve the above problems, in the further technical scheme, the area of the inlet port 360 and the area of the waist-shaped hole 363 are more than twice the area of the discharge port 361, the discharge port 361 is a circular hole, the cross section of the fertilizing screw 35 is circular, the diameter D1 of the fertilizing screw 35 is equal to the diameter D2 of the discharge port 361, and the eccentric distance H2 of the discharge port 361 is equal to the eccentric distance H1 of the fertilizing screw 35.

[0042] As shown in Figure 4 , the fertilizing screw 35 is at 0 degrees, and the lower end of the fertilizing screw 35 is reset to the discharge port 361 to close it, and the liquid fertilizer cannot be discharged from the discharge port 361. As shown in Figure 3 , after the fertilizing screw 35 rotates 90 degrees, the discharge port 361 is partially opened and partially closed, and the liquid fertilizer can be discharged from the discharge port 361. As shown in Figure 5 , after the fertilizing screw 35 rotates 180 degrees, the discharge port 361 is completely opened. After the fertilizing screw 35 rotates 270 degrees, the fertilizing screw 35 returns to the position shown in Figure 3 , and after the fertilizing screw rotates 360 degrees, the fertilizing screw returns to the position shown in Figure 4 , and the discharge port 361 is completely closed. Therefore, every time the fertilizing screw 35 rotates one revolution, the lower end of the fertilizing screw 35 is reset to the discharge port 361 to close it, and the discharge port 361 is closed and opened in a cycle, avoiding the problem of fertilizer leakage. Because the area of the inlet port 360 and the area of the waist-shaped hole 363 are more than twice the area of the discharge port 361, the fertilizer injection speed of the discharge port 361 is more than twice.

[0043] As shown in Figure 9 , Figure 10 , Figure 11 , the application preferably uses the screw fertilizer mechanism 3 of the second embodiment, which is different from the screw fertilizer mechanism of the first embodiment in that the cross section of the fertilizing screw 35 is a special-shaped structure, which includes a circular arc segment 350 with a diameter of D1 and a straight line segment 351. The cross section of the fertilizing screw 35 is a special-shaped structure, which is suitable for conveying granular fertilizer (solid fertilizer). The cross section of the fertilizing screw 35 is a circular structure, which is suitable for conveying powdery fertilizer, paste fertilizer and liquid fertilizer.

[0044] As shown in Figure 12As shown, a control system of a seeding synchronization screw fertilizer machine includes a controller, a sensor module, a motor drive module, and a user interface module. The sensor module includes a first sensor, a second sensor, and a third sensor. The motor drive module is used to drive a seeding motor 40 and a fertilizer motor 31. The user interface module displays and monitors the working state in real time, sets the fertilizer and seeding parameters. The first sensor is installed on a frame 100, and the first sensor monitors the rotation angle of a ground wheel 1 in real time. The second sensor is installed on a screw fertilizer mechanism 3, and the second sensor monitors the rotation angle of a fertilizer screw 35 in real time. The third sensor is installed on a seeder 4, and the third sensor monitors the rotation angle of the seeding motor 40 in real time.

[0045] The user interface module displays and monitors the working state in real time, and sets the fertilizer and seeding parameters as follows:

[0046] 1. Interface layout:

[0047] 1.1 Parameter setting area: user inputs and adjusts various parameters.

[0048] Fertilizer amount per rotation: input the amount of fertilizer per rotation of the fertilizer screw, default is 28g.

[0049] Ground wheel distance per pass: set the distance per pass of the ground wheel, default is 56.6cm. (i.e. the fertilizer distance interval).

[0050] Seeding wheel diameter: set the diameter of the seeding wheel, default is 60mm.

[0051] Fertilizer interval: set how many meters the ground wheel passes per fertilization, and the user adjusts according to the demand.

[0052] 1.2 Real-time monitoring area: display the current system state, including the ground wheel speed and the distance passed, the seeding wheel speed, the fertilizer screw speed, and the amount of fertilizer per fertilization.

[0053] Ground wheel speed (first sensor signal): real-time display of the ground wheel speed.

[0054] Seeding wheel speed (third sensor signal): real-time display of the seeding wheel speed.

[0055] Fertilizer screw speed (second sensor signal): real-time display of the fertilizer screw speed.

[0056] Amount of fertilizer per fertilization: display the amount of fertilizer per fertilization (single fertilization amount * rotation number) according to the actual working condition.

[0057] 1.3 Operation control area: start, stop, adjust the running mode, and other operation buttons.

[0058] 1.4 Alarm prompt area: display system abnormality or fault prompt.

[0059] The controller collects the first sensor, second sensor, third sensor signal, according to the wheel rotation angle and fertilization, seeding parameters collected by the first sensor, using the motor drive module to drive the seeding motor 40 and the fertilization motor 31 to run synchronously; using the second sensor and the third sensor signal to realize feedback control.

[0060] When the wheel 1 rotates a circle, the fertilization motor 31 drives the fertilization screw 35 to rotate a circle, accurately conveying the quantitative fertilizer 28g to the discharge port 361, realizing precision fertilization; at the same time, the seeding motor 40 of the seeder 4 drives the seeding wheel to rotate a circle synchronously, and three seeds are sown. The whole process ensures the synchronization of fertilization and seeding, improves the uniformity and accuracy of operation. In the non-fertilization state, the controller controls the fertilization motor 31 to drive the lower end of the fertilization screw 35 to reset to the discharge port 361 to close it, ensuring no fertilizer leakage.

[0061] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A screw-type fertilizer applicator, characterized in that, A spiral guide tube (36) is installed at the lower end of the fertilizer box (30), a fertilizer screw (35) is installed inside the spiral guide tube (36), a discharge nozzle (37) is installed at the lower end of the spiral guide tube (36), an inlet (360) is opened at the top of the spiral guide tube (36), and a discharge port (361) is opened at the bottom of the spiral guide tube (36). The inlet (360) is connected to the fertilizer box (30), and the discharge port (361) is connected to the discharge nozzle (37). The inner wall of the spiral conduit (36) is a double-helix surface. The fertilizing screw (35) is an eccentric helical screw. The lead of the spiral conduit (36) is twice the pitch of the fertilizing screw (35). The cross-section of the inner cavity of the spiral conduit (36) is a waist-shaped hole (363). The semi-circular diameters at both ends of the waist-shaped hole (363) are equal to the diameter D1 of the fertilizing screw (35). The straight segment distance H3 of the waist-shaped hole (363) is equal to four times the eccentricity H1 of the fertilizing screw (35). The fertilizer screw (35) meshes and rotates in the inner cavity of the spiral guide tube (36). On the one hand, it rotates around its own axis, and on the other hand, it rolls along the surface of the waist-shaped hole (363) in the inner cavity of the spiral guide tube (36). A sealed chamber (362) is formed between the spiral guide tube (36) and the fertilizer screw (35). Every time the fertilizer screw (35) rotates once, the fertilizer in the sealed chamber (362) is pushed forward by one screw pitch and finally squeezed out from the discharge port (361).

2. The screw fertilizer applicator according to claim 1, characterized in that, The area of ​​the feed inlet (360) and the area of ​​the waist-shaped hole (363) are both more than twice the area of ​​the discharge port (361). The diameter D1 of the fertilizer screw (35) is equal to the diameter D2 of the discharge port (361), and the eccentricity H2 of the discharge port (361) is equal to the eccentricity H1 of the fertilizer screw (35). Every time the fertilizer screw (35) rotates once, the lower end of the fertilizer screw (35) returns to the discharge port (361) and closes it. The discharge port (361) is closed and opened in a cycle once.

3. The screw fertilizer applicator according to claim 2, characterized in that, The cross-section of the fertilizer screw (35) is irregular, which includes a circular arc segment (350) with a diameter greater than 180 degrees and a straight segment (351). The diameter of the circular arc segment (350) is D1.

4. The screw fertilizer applicator according to any one of claims 1 to 3, characterized in that, The fertilizer box (30) is equipped with a fertilizer motor (31), a first universal joint (32), a second universal joint (34), a drive shaft (33), and a stirring hose (8). The first universal joint (32) is connected to the fertilizer motor (31), the second universal joint (34) is connected to the fertilizer screw (35), the two ends of the drive shaft (33) are connected to the first universal joint (32) and the second universal joint (34) respectively, and the stirring hose (8) is connected to the drive shaft (33). The fertilizer motor (31) drives the first universal joint (32), the drive shaft (33), the second universal joint (34), the fertilizer screw (35), and the stirring hose (8) to rotate in sequence.

5. A simultaneous sowing and fertilization screw applicator, characterized in that, The screw fertilization mechanism includes any one of claims 1 to 4, wherein the screw fertilization mechanism (3) is mounted on the frame (100), a ground wheel (1) and a furrow opener (7) are mounted in front of the screw fertilization mechanism (3), a seeder (4) is mounted behind the screw fertilization mechanism (3), a soil covering plate (6) is mounted behind the seeder (4), a soil pressing wheel mechanism (5) is mounted behind the soil covering plate (6), and a clamping mechanism (2) is mounted on the frame (100).

6. The simultaneous sowing and fertilizing screw applicator according to claim 5, characterized in that, The soil compaction wheel mechanism (5) includes a pressure wheel bracket (51), a pressure wheel (50), and a pressure wheel return spring (52). The pressure wheel (50) is mounted on the pressure wheel bracket (51), the pressure wheel bracket (51) is hinged to the frame (100), and the two ends of the pressure wheel return spring (52) are connected to the pressure wheel bracket (51) and the frame (100) respectively.

7. The simultaneous sowing and fertilizing screw applicator according to claim 5, characterized in that, The clamping mechanism (2) includes a hinge plate (20), a first connecting rod (21), a second connecting rod (22), a clamping part (23), and a clamping return spring (24). The hinge plate (20) is connected to the frame (100). The hinge plate (20), the first connecting rod (21), the second connecting rod (22), and the clamping part (23) are connected to each other to form a parallelogram mechanism. The two ends of the clamping return spring (24) are respectively connected to the two hinge points on the diagonal of the parallelogram mechanism.

8. The simultaneous sowing and fertilizing screw applicator according to claim 5, characterized in that, A seeding motor (40) is installed on the seeder (4). For every revolution of the seeding motor (40), the seeder (4) sows three seeds.

9. The simultaneous sowing and fertilizing screw applicator according to claim 8, characterized in that, It includes a controller, a sensor module, a motor drive module, and a user interface module; the sensor module includes a first sensor, a second sensor, and a third sensor; the motor drive module is used to drive the seeding motor (40) and the fertilizing motor (31); the user interface module displays and monitors the operation status and sets the fertilizing and seeding parameters in real time; the first sensor is installed on the frame (100) and monitors the rotation angle of the ground wheel (1) in real time; the second sensor is installed on the screw fertilizing mechanism (3) and monitors the rotation angle of the fertilizing screw (35) in real time; the third sensor is installed on the seeder (4) and monitors the rotation angle of the seeding motor (40) in real time. The controller collects signals from the first sensor, the second sensor, and the third sensor. Based on the rotation angle of the ground wheel and the fertilization and sowing parameters collected by the first sensor, it uses the motor drive module to drive the sowing motor (40) and the fertilization motor (31) to run synchronously. Feedback control is achieved using the signals from the second sensor and the third sensor.

10. The simultaneous sowing and fertilizing screw applicator according to claim 9, characterized in that, When not fertilizing, the controller controls the fertilizing motor (31) to drive the lower end of the fertilizing screw (35) to reset to the discharge port (361) and close it, based on the rotation angle of the fertilizing screw (35) collected by the second sensor.

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