Agricultural machinery spraying device and control method thereof

Abstract

The present invention discloses an agricultural machinery spraying device and a control method thereof, belonging to the technical field of agricultural machinery; the present invention comprises a support sleeve frame, a concave rod is provided on one side of the support sleeve frame, a power assembly is provided at the top center of the concave rod, rotary cylinder sleeves are symmetrically provided at both ends of the concave rod, stem spray beam frames are symmetrically provided on the inner walls of both ends of the concave rod, and direct spray sleeve rods are symmetrically provided on the inner wall of the rotary cylinder sleeve; the present invention flexibly adapts to different crops by pre-adjusting components such as an extension nozzle, a support sleeve frame and a direct spray port, ensuring that liquid medicine accurately covers all parts of the crops; a booster pump and a high-pressure nozzle are used to achieve range spraying, thereby improving efficiency and utilization rate; the inclined airflow generated by the arc-shaped guide vane enhances the contact between liquid medicine and crops, thereby improving coverage and penetration effect; automatic spraying is achieved through mechanical transmission, automatic regulating valves and other equipment, thereby reducing manual intervention and improving work efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery, and in particular to an agricultural machinery spraying device and a control method thereof. Background Art

[0002] In the field of modern agricultural production, with the increasing demand for large-scale land management and refined crop management, agricultural machinery spraying devices play an increasingly critical role; traditional manual spraying methods are extremely inefficient. Faced with large areas of farmland, they consume a lot of manpower and time costs, and it is difficult to ensure the uniformity of spraying. Farmers use handheld sprayers, which is not only labor-intensive and prone to physical fatigue and injury due to long-term work, but also affected by human factors. The amount of pesticides or fertilizers applied in different regions varies significantly, which cannot provide a stable and balanced nutrient supply for crop growth, thereby affecting crop yield and quality.

[0003] In conjunction with the above content, it should be noted that: Chinese patent application number CN2023235983718 discloses an agricultural machine for spraying insecticides. The above device is used to promote the adhesion of sprayed drugs to plants by adjusting the spraying angle. However, during actual use, there are large differences in the diagnostic and treatment characteristics of drugs for plant diseases, and most traditional spraying covers the top area of ​​​​the plants, resulting in some drug spraying for the prevention and control of plant root and stem diseases failing to achieve the original effect.

[0004] In view of the above technical defects, a solution is now proposed. Summary of the Invention

[0005] The object of the present invention is to provide an agricultural spraying device and a control method thereof to solve the problems raised.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an agricultural spraying device, comprising a support frame, a concave rod provided on one side of the support frame, a power assembly provided at the center of the top of the concave rod, rotary cylinder sleeves symmetrically provided at both ends of the concave rod, stem spray beams symmetrically provided on the inner walls of both ends of the concave rod, direct spray sleeve rods symmetrically provided on the inner wall of the rotary cylinder sleeve, and the power assembly including a booster pump and a high-pressure air pump;

[0007] A plurality of extension nozzles are provided through the top of the stem spray beam frame, a balance beam is provided on the top of the extension nozzle, a direct spray port is provided on one side outer wall of the direct spray sleeve, and an arc guide piece is sleeved on the outer wall of the top of the direct spray sleeve.

[0008] Furthermore, a shaft sleeve is provided in the middle of the other side of the support sleeve frame, and telescopic cylinder frames connected to the rotary cylinder sleeve are provided at both ends of the concave rod, and regulating valves are provided on the top of the rotary cylinder sleeve and the concave frame.

[0009] Furthermore, the booster pumps are provided in multiple groups and are symmetrically arranged at both ends of the high-pressure air pump. The end face of the booster pump is provided with a water supply pipeline connected to part of the regulating valve. The bottom of the booster pump is provided with a slag discharge valve connected to the water supply pipeline. The top outer wall of the booster pump is provided with a filling valve.

[0010] Furthermore, an air extraction pipeline connected to the slag discharge valve is provided at the bottom of the high-pressure air pump, and an air supply pipeline connected to part of the regulating valve is provided at the top of the high-pressure air pump.

[0011] Furthermore, multiple groups of driving motors are symmetrically arranged on the outer walls on both sides of the stem spray beam frame, a hollow frame is arranged in the upper half of the extension nozzle tube body, and a spring damper is arranged on the top of the hollow frame, and a filter is arranged on the top of the spring damper which is slidably connected to the inner wall of the extension nozzle, and multiple groups of atomizing micropores are arranged on the lower half of the extension nozzle tube body.

[0012] Furthermore, multiple groups of telescopic hoses are symmetrically arranged at the bottom of both ends of the balance beam, horizontal rotary cylinders connected to the inner wall of the concave rod are symmetrically arranged at both ends of the stem spray beam frame, and external valves connected to the telescopic hoses are symmetrically arranged at the top of both ends of the stem spray beam frame, and the external valves are connected to the water supply pipeline flange.

[0013] Furthermore, a central shaft rod is provided inside the direct injection sleeve rod and is sleeved with a rotary cylinder sleeve. Side sleeve rotary cylinders are sleeved on the outer walls of both ends of the central shaft rod close to the rod body of the rotary cylinder sleeve. The side sleeve rotary cylinder is connected and fixed to the bottom of the arc guide vane. A plurality of groups of high-pressure nozzles are provided on the cross-section of one side of the direct injection port, and a plurality of groups of air jets arranged at an inclined angle are provided on the inner wall of the bottom of the arc guide vane.

[0014] A method for controlling an agricultural spraying device comprises the following steps:

[0015] Pre-preparation: Pull the agricultural machine to drive the support frame into the planting field where the liquid medicine needs to be sprayed, and adjust the downward extension length of the extension nozzle in advance according to the length of the roots and straws of the plants in the planting field and the overall height.

[0016] Traction direct injection: The rotary cylinder sleeve drives the central shaft to rotate, and the central shaft drives the direct injection port and the side sleeve rotary cylinder to the angle of the plant. The booster pump and the high-pressure nozzle work together to pressurize and spray the liquid medicine toward the top area of ​​the plant.

[0017] The air jet guides it outward, forming an inclined airflow from top to bottom above the injection range of the straight nozzle.

[0018] Traction stem spraying: The extended nozzle is slid downward in advance to adjust the length according to the height of the root stem and the overall height of the plant. The liquid medicine overflows outward along the atomization micropores at the bottom of the extended nozzle, forming a range atomization area at the bottom of the extended nozzle.

[0019] Liquid diversion process: After the liquid medicine is drawn onto the agricultural machinery and enters the booster pump through the pipe fittings and the injection valve, it is pressurized by the booster pump and then diverted along the water pipeline to the direct spraying rod and stem spraying beam area;

[0020] The high-pressure air pump draws in external air, filters it through the high-pressure air pump's own filter element, and then delivers it to the arc-shaped guide vane through the air pipeline.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention can flexibly adapt to crops of different types and growth heights by pre-adjusting the length of the extended nozzle and the height of the support sleeve, as well as the angles of the straight nozzle and the curved guide vane, ensuring that the liquid medicine can accurately cover the top, rhizome and straw areas of the crops. Utilizing a booster pump and a high-pressure nozzle, the liquid medicine can be sprayed onto the crops at a higher pressure, achieving wide-area coverage spraying, improving spraying efficiency and liquid medicine utilization. At the same time, the inclined airflow generated by the curved guide vane helps to promote better contact between the liquid medicine and the crops, further improving coverage and penetration.

[0023] 2. The present invention realizes the automatic spraying of liquid medicine through the coordinated action of mechanical transmission, automatic regulating valve and high-pressure air pump and other equipment, reduces manual intervention, and improves work efficiency and accuracy. In addition, through the design of external valve and telescopic hose, the flow direction and flow rate of liquid medicine can be conveniently adjusted. The cleaning of liquid medicine and maintenance of extended nozzle are also considered. Impurities and undissolved drug particles are intercepted by filter disc, and the liquid medicine is reversely extracted by high-pressure air pump to clean the filter disc and extended nozzle, which effectively alleviates the blockage phenomenon, extends the service life of the equipment, and ensures the continuity of single operation. By precise spraying and reducing liquid medicine waste, it helps to reduce the pollution of pesticides to the environment, which meets the requirements of sustainable development of modern agriculture. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the support sleeve of the present invention;

[0027] Figure 3 Schematic diagram of the flow direction of liquid and gas in the power assembly of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the telescopic cylinder frame of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the stem spray beam frame of the present invention;

[0030] Figure 6 This is a schematic structural diagram of the extension nozzle of the present invention;

[0031] Figure 7 It is a structural schematic diagram of the direct injection sleeve rod of the present invention.

[0032] Reference numerals: 1. Support frame; 101. Concave rod; 102. Telescopic cylinder frame; 103. Rotary cylinder sleeve; 104. Regulating valve; 2. Power assembly; 201. Booster pump; 202. High-pressure air pump; 203. Slag discharge valve; 3. Stem-spray beam frame; 301. Lianheng rotary cylinder; 302. External valve; 303. Telescopic hose;

[0033] 304, extension nozzle; 305, balance beam; 306, drive motor; 307, spring damper; 308, filter; 4, direct injection sleeve rod; 401, center shaft; 402, side sleeve rotary cylinder; 403, arc guide vane;

[0034] 404. Direct nozzle. DETAILED DESCRIPTION

[0035] 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.

[0036] Example 1: Please refer to Figure 1 - Figure 7 As shown, this embodiment is an agricultural machinery spraying device and a control method thereof, including a support sleeve 1, a concave rod 101 is provided on one side of the support sleeve 1, a power assembly 2 is provided at the top center of the concave rod 101, rotary cylinder sleeves 103 are symmetrically provided at both ends of the concave rod 101, stem spray beam frames 3 are symmetrically provided on the inner walls of both ends of the concave rod 101, and direct injection sleeve rods 4 are symmetrically provided on the inner wall of the rotary cylinder sleeve 103. The power assembly 2 includes a booster pump 201 and a high-pressure air pump 202.

[0037] A shaft sleeve is provided in the middle of the other side of the support sleeve 1, and telescopic cylinder frames 102 connected to the rotary cylinder sleeve 103 are provided at both ends of the concave rod 101. A regulating valve 104 is provided on the top of the rotary cylinder sleeve 103 and the concave frame 101. The spraying liquid is loaded into the storage device of the traction agricultural machinery in advance, and is connected to the injection port flange of the booster pump 201 through a pipeline. The support sleeve 1 is then connected to the traction agricultural machinery through accessories such as connecting rods. The traction agricultural machinery drives the support sleeve 1 into the planting field where the spraying liquid is required. The downward extension length of the extension nozzle 304 is adjusted in advance according to the length and overall height of the roots and straws of the plants in the planting field.

[0038] The booster pump 201 is provided with multiple groups and symmetrically arranged at both ends of the high-pressure air pump 202. The end face of the booster pump 201 is provided with a water pipeline connected to the partial regulating valve 104. The bottom of the booster pump 201 is provided with a slag discharge valve 203 connected to the water pipeline. The top outer wall of the booster pump 201 is provided with a filling valve. After the liquid medicine on the traction agricultural machine enters the inside of the booster pump 201 through the pipe fittings and the filling valve, it is pressurized by the booster pump 201 and then diverted along the water pipeline to the direct spray sleeve rod 4 and the stem spray beam frame 3 area. Figure 3 Opening arrow.

[0039] The bottom of the high-pressure air pump 202 is provided with an air extraction pipeline connected to the slag discharge valve 203, and the top of the high-pressure air pump 202 is provided with an air supply pipeline connected to the partial regulating valve 104. The high-pressure air pump 202 extracts external air, filters it through the filter element of the high-pressure air pump 202, and then transmits it to the arc guide plate 403 through the air supply pipeline. Figure 3 Indicated by hollow arrows.

[0040] At the same time, when the extended nozzle 304 continues to pass through the liquid medicine, some impurities or undissolved drug particles exist in the liquid medicine, which are first intercepted by the filter 308. The drug particles are dissolved as the liquid medicine continues to pass through. The impurities are retained and accumulated on the filter 308. After a certain amount of accumulation, the flow of liquid medicine inside the extended nozzle 304 is blocked. Accordingly, the spring damper 307 is pushed and compressed by the filter 308. When the traction agricultural machine is stopped or turned around, the operator starts the connection between the high-pressure air pump 202 and the exhaust pipe, and disconnects the connection between the booster pump 201 and the water pipe. The compressed air pump 202 is connected to the unloading valve through the suction pipe, and continuously extracts the liquid retained inside the water supply pipe, prompting the liquid inside the water supply pipe to be emptied, and the liquid inside the extension nozzle 304 is reversely extracted, prompting the impurities retained on the filter 308 to flow in the opposite direction with the liquid, until the liquid is discharged along the unloading valve 203, which is used to alleviate the blockage phenomenon inside the extension nozzle 304. While waiting for the device to be repaired, the extension nozzle 304 is carefully cleaned. It should be noted that the aperture of the straight nozzle 404 is larger than the atomizing micropore. Therefore, some impurities in the straight nozzle 404 can be directly cleaned by spraying with liquid.

[0041] Embodiment 2: This embodiment is an agricultural machinery spraying device and its control method, including a stem spraying beam frame 3 with multiple groups of extension nozzles 304 passing through the top, a balance beam 305 is provided on the top of the extension nozzle 304, a direct spray port 404 is provided on the outer wall of one side of the direct spraying sleeve 4, and an arc-shaped guide plate 403 is sleeved on the outer wall of the top of the direct spraying sleeve 4.

[0042] A plurality of drive motors 306 are symmetrically arranged on the outer walls on both sides of the stem spray beam frame 3, a hollow frame is arranged in the upper half of the extension nozzle 304, and a spring damper 307 is arranged on the top of the hollow frame, a filter 308 is arranged on the top of the spring damper 307 and is slidably connected to the inner wall of the extension nozzle 304, and a plurality of atomization micropores are arranged on the lower half of the extension nozzle 304.

[0043] The outer wall of the upper half of the extension nozzle 304 is recessed with symmetrical teeth, and the extension nozzle 304 is slidably sleeved in the stem spray beam frame 3. As the drive motor 306 runs, the drive motor 306 engages and transmits with the teeth of the extension nozzle 304 through mechanical accessories such as gear couplings, so that when the support sleeve 1 enters the plant area, the extension nozzle 304 is slid downward in advance to adjust the length according to the height of the roots and straws of the plants and the overall height, to ensure that the atomizing micropore area at the bottom of the extension nozzle 304 covers the root and straw area of ​​the plants. As the traction agricultural machine moves forward, the extension nozzle 304 moves along the planting interval in the middle of the plants. It should be noted that the plants are some of the plants in the Poaceae family. The spacing between the extension nozzles 304 is adapted and adjusted according to actual needs. In addition, modern agricultural planting is carried out by mechanical sowing, and the Poaceae plants are planted in an orderly arrangement.

[0044] Multiple groups of telescopic hoses 303 are symmetrically arranged at the bottom of both ends of the balance beam 305, and horizontal rotary cylinders 301 connected to the inner wall of the concave rod 101 are symmetrically arranged at both ends of the stem spray beam frame 3. External valves 302 connected to the telescopic hoses 303 are symmetrically arranged at the top of both ends of the stem spray beam frame 3, and the external valves 302 are flange-connected to the water supply pipeline.

[0045] The external valve 302 is flange-connected to a portion of the regulating valve 104 via a branch pipe, and is used to guide the liquid medicine inside a portion of the water pipeline into the telescopic hose 303. The telescopic hose 303 guides the liquid medicine into the balance beam 305. The balance beam 305 evenly distributes the liquid medicine to each group of extension nozzles 304. After the liquid medicine in the extension nozzles 304 is continuously pressurized, the liquid medicine overflows outward along the atomization micropores at the bottom of the extension nozzles 304, forming a range of atomization areas at the bottom of the extension nozzles 304. Figure 6As shown, as the traction agricultural machinery continues to move forward, the roots, stems and straws of the plants it passes by are sprayed with liquid medicine, and the airflow guided by the upper arc-shaped guide vane 403 and the aerodynamics generated by the movement of the traction agricultural machinery prompt the liquid medicine mist to move in the area of ​​the roots, stems and straws of the plants, accelerating the surface coverage process of the drug mist and the roots, stems and straws of the plants, and greatly improving the overall contact efficiency and coverage uniformity between the liquid medicine and the plants.

[0046] A central shaft 401 is provided inside the direct injection sleeve 4, which is sleeved with the rotary cylinder sleeve 103. Side sleeve rotary cylinders 402 are sleeved on the outer walls of both ends of the central shaft 401, which are close to the rod body of the rotary cylinder sleeve 103. According to the overall height of the plants exposed above the soil in the planting field, the vertical height between the support sleeve 1 and the plants is adjusted by the external connecting parts on the traction agricultural machine, and the central shaft 401 is driven to rotate by the rotary cylinder sleeve 103. The central shaft 401 drives the direct injection port 404 and the side sleeve rotary cylinder 402 toward the angle of the plants. The side sleeve rotary cylinder 402 drives the arc guide vane 403 to rotate, and further adjusts the coverage angle between the arc guide vane 403 and the plants and the direct injection area;

[0047] The interior of the direct injection port 404 is connected to the regulating valve 104 on the rotary cylinder sleeve 103 through a branch pipe. Based on this, part of the liquid medicine in the water supply pipeline is guided into the direct injection port 404. Under the coordinated action of the booster pump 201 and the high-pressure nozzle, the liquid medicine is pressurized and sprayed toward the top area of ​​the plant, thereby achieving a range-covering spraying of the liquid medicine to the rear area where the towing agricultural machinery passes.

[0048] The side sleeve rotary cylinder 402 is connected and fixed to the bottom of the arc-shaped guide vane 403. A plurality of groups of high-pressure nozzles are arranged on the cross section of one side of the straight nozzle 404. A plurality of groups of air nozzles arranged at an inclined angle are arranged on the inner wall of the bottom of the arc-shaped guide vane 403. An air cavity is arranged inside the arc-shaped guide vane 403, and a telescopic air pipe connected to the flange of the gas transmission pipeline is arranged at the bottom of the air cavity, which is used to guide the internal airflow of the high-pressure air pump 202 into the air cavity, and the air nozzle guides it to leak out. At this point, an inclined airflow from top to bottom is formed above the injection range of the straight nozzle 404, which is not only used to push the top area of ​​the plant to sway with the wind, but also to promote part of the ejected liquid medicine, and the liquid medicine that explodes after contacting the top of the plant to change the moving direction, which is used to assist the liquid medicine of the straight nozzle 404 to contact the plant. The arc-shaped guide vane 403 is used to prevent the sprayed liquid medicine from flying up with the wind, thereby improving the coverage rate of the liquid medicine on the plant.

[0049] In combination with Example 1 and Example 2, the present invention flexibly adapts to different crops by pre-adjusting components such as the extension nozzle 304, the support sleeve 1 and the straight nozzle 404, ensuring that the liquid medicine accurately covers all parts of the crop; uses the booster pump 201 and the high-pressure nozzle to achieve range spraying, improve efficiency and utilization rate, and the inclined airflow generated by the arc guide vane 403 enhances the contact between the liquid medicine and the crop, thereby improving coverage and penetration effect.

[0050] Automated spraying is achieved through mechanical transmission, automatic regulating valve 104 and other equipment, reducing manual intervention and improving work efficiency and accuracy. At the same time, the cleaning process of external valve 302, telescopic hose 303 and filter 308 is designed to facilitate the adjustment of the flow direction and flow of the liquid medicine, effectively alleviate blockage, extend the life of the equipment, spray accurately and reduce waste, which meets the requirements of sustainable development of modern agriculture.

[0051] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

[0052] In the description of this specification, the descriptions with reference to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Related accessories include couplings, screws, gears, gaskets and other commonly used mechanical connection components in this field, but are not limited to these. They are replaced and adapted according to actual use.

[0053] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An agricultural spraying device, comprising a support frame (1), characterized in that: A concave rod (101) is provided on one side of the support sleeve (1), a power assembly (2) is provided at the center of the top of the concave rod (101), rotary cylinder sleeves (103) are symmetrically provided at both ends of the concave rod (101), stem spray beam frames (3) are symmetrically provided on the inner walls of both ends of the concave rod (101), and direct injection sleeve rods (4) are symmetrically provided on the inner wall of the rotary cylinder sleeve (103), and the power assembly (2) includes a booster pump (201) and a high-pressure air pump (202); The top of the stem spray beam frame (3) is provided with multiple groups of extension nozzles (304), the top of the extension nozzle (304) is provided with a balance beam (305), a direct injection port (404) is provided on the outer wall of one side of the direct injection sleeve (4), an arc-shaped guide vane (403) is sleeved on the outer wall of the top of the direct injection sleeve (4), a cross section of one side of the direct injection port (404) is provided with multiple groups of high-pressure nozzles, and the bottom inner wall of the arc-shaped guide vane (403) is provided with multiple groups of air jets arranged at an inclined angle; A plurality of drive motors (306) are symmetrically arranged on the outer walls of both sides of the stem spray beam frame (3); a hollow frame is arranged in the upper half of the tube body of the extension nozzle (304); a spring damper (307) is arranged on the top of the hollow frame; a filter (308) is arranged on the top of the spring damper (307) and is slidably connected to the inner wall of the extension nozzle (304); and a plurality of atomization micropores are arranged on the lower half of the tube body of the extension nozzle (304); The booster pump (201) is provided with multiple groups and symmetrically arranged at both ends of the high-pressure air pump (202); the end surface of the booster pump (201) is provided with a water pipeline connected to a part of the regulating valve (104); the bottom of the booster pump (201) is provided with a slag discharge valve (203) connected to the water pipeline; and the top outer wall of the booster pump (201) is provided with a material injection valve; An air extraction pipeline connected to the slag discharge valve (203) is provided at the bottom of the high-pressure air pump (202), and an air delivery pipeline connected to the partial regulating valve (104) is provided at the top of the high-pressure air pump (202).

2. The agricultural spraying device according to claim 1, characterized in that: A shaft sleeve is provided in the middle of the other side of the support sleeve frame (1), and telescopic cylinder frames (102) connected to the rotary cylinder sleeve (103) are provided at both ends of the concave rod (101). A regulating valve (104) is provided on the top of the rotary cylinder sleeve (103) and the concave rod (101).

3. The agricultural spraying device according to claim 1, characterized in that: A plurality of groups of telescopic hoses (303) are symmetrically provided at the bottom of both ends of the balance beam (305), a horizontal rotary cylinder (301) connected to the inner wall of the concave rod (101) is symmetrically provided at both ends of the stem spray beam frame (3), and an external valve (302) connected to the telescopic hose (303) is symmetrically provided at the top of both ends of the stem spray beam frame (3), and the external valve (302) is flange-connected to the water supply pipeline.

4. The agricultural spraying device according to claim 1, characterized in that: A central shaft (401) sleeved with the rotary cylinder sleeve (103) is provided inside the direct injection sleeve rod (4), and side sleeve rotary cylinders (402) are sleeved on the outer walls of both ends of the central shaft rod (401) near the rod body of the rotary cylinder sleeve (103). The side sleeve rotary cylinders (402) are connected and fixed to the bottom of the arc-shaped guide vane (403).

5. A control method for an agricultural spraying device, used for the agricultural spraying device according to claim 4, characterized in that: The following steps are involved: Pre-preparation: the agricultural machine is pulled to drive the support frame (1) into the planting field where the liquid medicine is to be sprayed, and the downward extension length of the extension nozzle (304) is adjusted in advance according to the length and overall height of the roots and stalks of the plants in the planting field; Traction direct injection: the rotary cylinder sleeve (103) drives the central shaft (401) to rotate, and the central shaft (401) drives the direct injection port (404) and the side sleeve rotary cylinder (402) toward the angle of the plant; the booster pump (201) and the high-pressure nozzle cooperate to pressurize the liquid medicine and spray it toward the top area of ​​the plant; At the same time, the air jet guides the air to be discharged outside, forming an inclined airflow from top to bottom above the injection range of the straight nozzle (404); Traction stem spraying: the extension nozzle (304) is slid downward in advance to adjust the length according to the height of the root, stem, and stalk of the plant and the overall height; the liquid medicine overflows outward along the atomization micropores at the bottom of the extension nozzle (304), forming a range atomization area at the bottom area of ​​the extension nozzle (304); Liquid introduction process: After the liquid medicine on the traction agricultural machinery enters the inside of the booster pump (201) through the pipe fittings and the injection valve, it is pressurized by the booster pump (201) and then diverted along the water pipeline to the direct spray sleeve rod (4) and the stem spray beam frame (3) area. The high-pressure air pump (202) draws in external air, filters it through the filter element of the high-pressure air pump (202), and then transports it to the arc guide plate (403) through the air pipeline; Cleaning process: When the traction agricultural machinery is stopped or turned, the connection between the high-pressure air pump (202) and the air extraction pipeline is started to continuously extract the liquid retained in the water pipeline, causing the impurities retained on the filter (308) to flow in the opposite direction with the liquid medicine until the liquid medicine is discharged through the slag discharge valve (203).

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