Anti-drifting wind curtain spray rod with side wind protection structure

Abstract

The utility model relates to agricultural machinery technical field, concretely is a kind of anti-drifting wind curtain spray pole with crosswind protection structure, comprising: hanger, hanger rear is connected with lifting device through lifting frame, and the rear side of lifting frame is hinged with spraying assembly through angle adjusting mechanism, and spraying assembly rear is equipped with wind curtain assembly.The utility model, by changing the distribution density and ventilation area of different position air outlet on spray pole, the uniformity of air outlet wind speed in full width range is ensured, the uneven defects of prior art wind curtain are overcome.The interaction point of airflow and mist drop is accurately set in the key area of kinetic energy attenuation below nozzle, efficient secondary refinement and directional delivery of mist drop are realized.Combined with the crosswind protection wind curtain specially arranged at the end and the synchronous pitch adjusting function of complete machine, the equipment obtains excellent anti-drifting effect, extremely high liquid medicine coverage rate and good environmental adaptability under complex wind conditions.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, specifically to an anti-drift wind curtain spray bar with a side wind protection structure. Background Technology

[0002] Currently, boom sprayers are widely used and highly efficient pesticide application equipment in field plant protection operations. However, because the spraying position is higher than the crops, the effectiveness of the operation is greatly affected by natural wind. In actual use, when the outdoor wind speed exceeds level two, the droplets sprayed from the boom will experience significant drift.

[0003] To overcome the problem of droplet drift, researchers added an air curtain component behind the spray boom. This air curtain forces the droplets towards the crop canopy, reducing the impact of wind; this type of spray boom is called an air curtain sprayer. However, due to the long air duct, the air velocity at the outlets from the middle to the two ends is uneven, resulting in poor wind protection in winds of force 4 or higher. Furthermore, because the air duct is parallel to the spray boom, the ends of the boom lack necessary protection, allowing droplets to drift along the axis of the boom in crosswinds, posing a risk of pesticide damage. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides an anti-drift air curtain spray bar with a side wind protection structure.

[0005] The technical solution of this utility model is: A drift-resistant air curtain spray bar with a crosswind protection structure includes: The bracket has a lifting frame connected to its rear via a lifting device. A spray assembly is hinged to the rear of the lifting frame via an angle adjustment mechanism. An air curtain assembly is provided behind the spray assembly. The spray assembly includes a spray frame and a spray pipe installed at the bottom of the spray frame, with a plurality of nozzles axially arranged below the spray pipe; The air curtain assembly includes a main fan and an air duct. The air duct is located at the rear and left and right ends of the spray pipe. An air outlet is provided below the air duct. The distribution density and ventilation area of ​​the air outlets in different areas of the air duct are different to ensure uniform airflow in each area. The air outlet is deflected towards the nozzle and its axis intersects with the axis of the nozzle below the nozzle.

[0006] Preferably, the axis of the air outlet intersects the axis of the nozzle in an area of ​​25 cm to 35 cm below the nozzle.

[0007] Preferably, the air duct includes a main air duct disposed behind the spray pipe, side air ducts connected to the main air duct and disposed at the left and right ends of the spray pipe, and an end air duct perpendicularly connected to the end of the side air duct.

[0008] Preferably, the air outlets on the side duct and the main duct have the same arrangement density, and the single air outlet area of ​​the air outlet on the main duct is not greater than one-half of the single air outlet area of ​​the air outlet on the side duct.

[0009] Preferably, the single air outlet area of ​​the air outlet on the end duct is the same as the single air outlet area of ​​the air outlet on the side duct, but the distribution density of the air outlet on the end duct is greater than the distribution density of the air outlet on the side duct.

[0010] Preferably, the angle adjustment mechanism includes a rotating seat, one end of which is fixedly connected to the lifting frame, and the other end of which is hinged to the rotating frame. The spray frame and the main fan are fixed to the end of the rotating frame.

[0011] Preferably, a rotating arm is provided below the rotating frame, and a first telescopic rod is hinged to the rotating arm. The tail end of the first telescopic rod is hinged to the lifting frame. By controlling the extension and retraction of the piston rod of the first telescopic rod, the rotating frame can be driven to rotate back and forth, and the spray frame and air curtain assembly can be driven to rotate synchronously.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This invention overcomes the uneven airflow defects of existing technologies by changing the distribution density and ventilation area of ​​the air outlets at different positions on the spray bar, ensuring uniform airflow velocity across the entire width. By precisely setting the interaction point between the airflow and the droplets at the critical area of ​​kinetic energy attenuation below the nozzle, efficient secondary refinement and directional delivery of the droplets are achieved. Combined with a dedicated side-wind protection air curtain at the end and a synchronized pitch adjustment function for the entire machine, the equipment achieves excellent anti-drift performance, extremely high liquid coverage, and good environmental adaptability under complex wind conditions. Attached Figure Description

[0013] Figure 1 The first figure shows the overall structure of this utility model; Figure 2 This is a top view of the overall structure of this utility model; Figure 3 This is a side view of the overall structure of this utility model; Figure 4 This is a schematic diagram showing the positional relationship between the nozzle and the air outlet in this utility model.

[0014] The meanings of the labels in the diagram are as follows: 1. Hanging frame; 2. Liquid storage tank; 3. Spray pump; 4. Lifting frame; 5. Lifting device; 6. Rotating seat; 7. Main spray frame; 8. Rotating frame; 9. Rotating arm; 10. First telescopic rod; 11. Side spray frame; 12. Second telescopic rod; 13. Spray pipe; 14. Nozzle; 15. Main fan; 16. Air duct; 161. Main air duct; 162. Side air duct; 163. End air duct; 17. Air outlet. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1: Please see Figure 1-4 The present invention will describe the above technical solution in detail through the following embodiments: A drift-resistant air curtain spray bar with a crosswind protection structure includes: Hanging bracket 1, with lifting device 5 connecting to lifting frame 4 at the rear of hanging bracket 1. Spray assembly is hinged to the rear of lifting frame 4 via angle adjustment mechanism, and air curtain assembly is provided behind spray assembly.

[0017] The bracket 1 is used for fixed connection with the tractor, and a fixed mounting point needs to be set on the side facing the tractor.

[0018] The hanger 1 is also equipped with a liquid storage tank 2, which is used to store the spraying liquid.

[0019] A spray pump 3 is fixedly installed below the storage tank 2 and on the bracket 1. The spray pump 3 is used to pump the agent in the storage tank 2 to the spray assembly for spraying.

[0020] It should be noted that the spray pump 3 is connected to the output shaft at the rear end of the tractor via a universal joint and is directly driven by the output shaft at the rear end of the tractor.

[0021] The lifting device 5 is a hydraulic cylinder, which is powered by hydraulic power provided by the tractor to drive the lifting frame 4 to move vertically.

[0022] The spray assembly includes a spray frame and a spray pipe 13 installed at the bottom of the spray frame, with a plurality of nozzles 14 axially arranged below the spray pipe 13.

[0023] The spray frame includes a main spray frame 7 and a side spray frame 11. The side spray frame 11 is hinged to both ends of the main spray frame 7. A second telescopic rod 12 is hinged between the side spray frame 11 and the main spray frame 7. The second telescopic rod 12 is a hydraulic cylinder, powered by a tractor, used to drive the side spray frame 11 to retract and extend.

[0024] The spray pipe 13 is divided into three sections, which are located at the bottom of the main spray frame 7 and the side spray frame 11, respectively.

[0025] The air curtain assembly includes a main fan 15 and an air duct 16. The air duct 16 is located at the rear side and the left and right ends of the spray pipe 13. An air outlet 17 is provided below the air duct 16. The distribution density and ventilation area of ​​the air outlets 17 in different areas of the air duct 16 are different to ensure uniform airflow in each area. The air outlet 17 is deflected towards the nozzle 14 and its axis intersects with the axis of the nozzle 14 below the nozzle 14.

[0026] The main blower 15 is a blower driven by a hydraulic motor, the power of which is provided by the tractor.

[0027] In this embodiment, the main fan 15 has a rated speed of 3100 rpm, an air volume of 30,000 cubic meters per hour, a static pressure of 1400 Pa, and a dynamic pressure of 400 Pa. The fan parameters are matched with the air outlet 17, and the air velocity of the air outlet 17 is adapted to a range of 20-25 m / s with a rated velocity of 25 m / s.

[0028] The axis of the air outlet 17 intersects the axis of the nozzle 14 in an area of ​​25 cm to 35 cm below the nozzle 14.

[0029] In field spraying systems of this field, after the droplets leave the nozzle 14, their motion undergoes two stages: an initial kinetic energy-dominated stage and a gravity-driven drift stage. As the droplets fly through the air, their initial kinetic energy is continuously dissipated due to the need to overcome air resistance. Based on the typical droplet diameter of 100-400 micrometers, the physical laws governing initial velocity and air resistance, it can be deduced that the significant effective distance of their initial kinetic energy is limited.

[0030] To achieve the most effective intervention on droplets in this critical region of kinetic energy attenuation, this application sets the intersection point of the axes of the air curtain outlet 17 and the nozzle 14 below the nozzle 14. Through comprehensive design of spray pressure, outlet angle and wind speed, the intersection point P is preferably positioned within a range of 25 cm to 35 cm below the nozzle 14.

[0031] The design aims to interact with the high-speed airflow in the critical region where the droplet's trajectory transitions from one stage to the next, in order to achieve optimal secondary refinement, directional delivery, and anti-drift effects.

[0032] The air duct 16 includes a main air duct 161 located behind the spray pipe 13, a side air duct 162 connected to the main air duct 161 and located at the left and right ends of the spray pipe 13, and an end air duct 163 vertically connected to the end of the side air duct 162.

[0033] As a specific embodiment of the present invention, the layout of the duct 16 is as follows: The width of the central section covered by the main duct 161 is 2.5 meters, the width of each side section covered by the side duct 162 is 5.5 meters, and the length of the end duct 163 is 40 centimeters.

[0034] The air outlets 17 on the side air duct 162 and the main air duct 161 are arranged at the same density, and the single air outlet area of ​​the air outlet 17 on the main air duct 161 is no more than half of the single air outlet area of ​​the air outlet 17 on the side air duct 162.

[0035] The single air outlet area of ​​the air outlet 17 on the end air duct 163 is the same as that of the single air outlet area of ​​the air outlet 17 on the side air duct 162, but the distribution density of the air outlet 17 on the end air duct 163 is greater than that of the air outlet 17 on the side air duct 162.

[0036] As a specific embodiment of the present invention, the parameters of the air outlet 17 are as follows: The distribution density of air outlets 17 on the main air duct 161 is 13 per meter, and the area of ​​each outlet is 3 square centimeters.

[0037] The distribution density of the air outlets 17 on the side duct 162 is also 13 per meter, but the area of ​​each outlet is 7 square centimeters. The end duct 163 is equipped with 7 air outlets 17, each with an air outlet area of ​​7 square centimeters.

[0038] The angle adjustment mechanism includes a rotating seat 6, one end of which is fixedly connected to the lifting frame 4 by bolts, and the other end is hinged to a rotating frame 8. The spray frame and the main fan 15 are fixed to the end of the rotating frame 8.

[0039] The main spray frame 7 is welded to the rotating frame 8, and the main fan 15 is fixedly installed on the top of the rotating frame 8 with bolts. A rotating arm 9 is provided below the rotating frame 8. The rotating arm 9 is hinged to a first telescopic rod 10. The tail end of the first telescopic rod 10 is hinged to the lifting frame 4. By controlling the extension and retraction of the piston rod of the first telescopic rod 10, the rotating frame 8 can be driven to rotate back and forth, and the spray frame and air curtain assembly can be driven to rotate synchronously.

[0040] The first telescopic boom 10 uses a hydraulic cylinder, and the hydraulic power of the first telescopic boom 10 is provided by the tractor.

[0041] As a preferred embodiment of this application, the rotation range of the rotating frame 8 can be set to 0 to 10 degrees forward and 0 to 10 degrees backward by controlling the stroke of the first telescopic rod 10. This range is designed to adapt to common headwind and tailwind conditions in the field and to help open the crop canopy.

[0042] Working principle: During operation, the high-speed airflow generated by the main fan 15 is transported through the air duct 16 to the main air duct 161, the side air duct 162 and the end air duct 163, and finally blown out from each air outlet 17. At the same time, the spray pump 3 delivers the liquid medicine to the spray pipe 13, which is atomized by the nozzle 14 and then sprayed out.

[0043] First, there is the precise coordination between the airflow and the droplets. Because the axis of the air outlet 17 is deflected towards the nozzle 14 and intersects with the nozzle axis within a region of 25 to 35 centimeters below it, the high-speed airflow can precisely capture the droplets at the critical stage when their initial kinetic energy decays and they are about to begin drifting randomly. The airflow not only further refines the droplets but also applies a directional thrust, forcing them towards the crop canopy. This process greatly suppresses the backward drift of the droplets under the influence of natural wind.

[0044] Secondly, there is the sealing effect of the three-dimensional air curtain. This application ensures that the air velocity from the center of the spray bar to both ends is uniform by varying the distribution density and ventilation area of ​​the air outlets 17 in different areas, thus forming a stable basic air curtain. Crucially, the end duct 163 at the outermost end of the spray bar generates a dense, vertically downward air curtain. This air curtain effectively blocks, consumes, and deflects lateral winds, preventing them from disrupting the trajectory of the terminal droplets, thereby achieving a three-dimensional blockade against lateral drift.

[0045] Finally, there is the flexibility of manual adjustment. When encountering special wind directions or dense crop canopies, operators can manually control the extension and retraction of the first telescopic rod 10, driving the rotating frame 8 to rotate the entire spray assembly and air curtain assembly synchronously, thus achieving manual adjustment of the pitch angle.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A drift-resistant air curtain spray bar with a crosswind protection structure, characterized in that, include: Hanging frame (1), a lifting frame (4) is connected to the rear of the hanging frame (1) via a lifting device (5), a spray assembly is hinged to the rear of the lifting frame (4) via an angle adjustment mechanism, and an air curtain assembly is provided behind the spray assembly; The spray assembly includes a spray frame and a spray pipe (13) installed at the bottom of the spray frame, with a plurality of nozzles (14) axially arranged below the spray pipe (13). The air curtain assembly includes a main fan (15) and an air duct (16). The air duct (16) is located on the rear side and the left and right ends of the spray pipe (13). An air outlet (17) is provided below the air duct (16). The distribution density and ventilation area of ​​the air outlets (17) in different areas of the air duct (16) are different to ensure uniform airflow in each area. The air outlet (17) is deflected towards the nozzle (14) and its axis intersects with the axis of the nozzle (14) below the nozzle (14).

2. The anti-drift air curtain spray bar with a sidewind protection structure as described in claim 1, characterized in that: The axis of the air outlet (17) intersects the axis of the nozzle (14) in an area 25 cm to 35 cm below the nozzle (14).

3. The anti-drift air curtain spray bar with a sidewind protection structure as described in claim 1, characterized in that: The air duct (16) includes a main air duct (161) located behind the spray pipe (13), a side air duct (162) connected to the main air duct (161) and located at the left and right ends of the spray pipe (13), and an end air duct (163) vertically connected to the end of the side air duct (162).

4. The anti-drift air curtain spray bar with a sidewind protection structure as described in claim 3, characterized in that: The air outlets (17) on the side air duct (162) and the main air duct (161) are arranged at the same density. The single air outlet area of ​​the air outlet (17) on the main air duct (161) is not greater than half of the single air outlet area of ​​the air outlet (17) on the side air duct (162).

5. The anti-drift air curtain spray bar with a sidewind protection structure as described in claim 3, characterized in that: The single air outlet area of ​​the air outlet (17) on the end air duct (163) is the same as that of the single air outlet area of ​​the air outlet (17) on the side air duct (162), but the distribution density of the air outlet (17) on the end air duct (163) is greater than that of the air outlet (17) on the side air duct (162).

6. The anti-drift air curtain spray bar with a sidewind protection structure as described in claim 1, characterized in that: The angle adjustment mechanism includes a rotating seat (6), one end of which is fixedly connected to the lifting frame (4), and the other end is hinged to a rotating frame (8). The spray frame and the main fan (15) are fixed at the end of the rotating frame (8).

7. The anti-drift air curtain spray bar with a sidewind protection structure as described in claim 6, characterized in that: The rotating frame (8) is provided with a rotating arm (9) below it. The rotating arm (9) is hinged to a first telescopic rod (10). The tail end of the first telescopic rod (10) is hinged to the lifting frame (4). By controlling the extension and retraction of the piston rod of the first telescopic rod (10), the rotating frame (8) can be driven to rotate back and forth, and the spray frame and air curtain assembly can be driven to rotate synchronously.

Images