A device for preventing wind-sand hazards in farmland and a method of using the same

Abstract

The application discloses a device for preventing wind-sand hazards in farmland and a use method thereof, and belongs to the field of farmland protection devices.The device comprises a sand-shielding plate and a supporting frame, one side of the sand-shielding plate is fixedly connected with a windward box, a connecting frame is arranged above the windward box, a machine fan is rotatably connected to the connecting frame, one side of the machine fan is fixedly connected with a connecting rod, the connecting rod is drivingly connected with a first bevel gear, the first bevel gear is meshingly connected with a second bevel gear, and the device can effectively block sand particles in the wind-sand flow, so that the sand particles cannot erode and bury seedlings.Meanwhile, after the wind enters the shunt pipe through the windward box and the airflow conveying pipe, the sand-shielding groove pipe can slide under the drive of the one-way threaded rod of the motor, the size of the air outlet can be adjusted by the dislocation of the air outlet and the airflow outlet, the wind speed of the strong wind can be reduced according to needs to prevent the stems of the seedlings from being broken, and the suitable breeze can be retained, so that the defects of the traditional fence type device that only blocks sand but does not control the wind are solved, and the demand for wind force for preventing wind hazards and seedling growth is balanced.

Description

Technical Field

[0001] This invention relates to the field of farmland wind and sand protection equipment, and in particular to a device for preventing farmland from being damaged by wind and sand and its method of use. Background Technology

[0002] The occurrence of wind and sand hazards in farmland is essentially the result of an imbalance between surface vegetation cover, soil structure, and wind action caused by the interaction between natural environmental evolution and human agricultural activities. From a natural perspective, the formation of wind and sand disasters is closely related to regional climate and topography. Under the influence of global climate fluctuations, some regions are showing a trend towards aridity and semi-aridity. Sparse rainfall leads to low surface vegetation cover, and the soil lacks the fixation of plant roots and the cover of dead branches and leaves, making it loose and easily eroded by wind. At the same time, areas such as desert edges, Gobi deserts, and windy coastal areas naturally possess abundant sand sources and strong winds. When the wind speed reaches the sand-lifting speed, loose sand particles on the surface will be blown up, forming wind-blown sand flows. Once these flows invade surrounding farmland, they will damage crops. In addition, seasonal strong winds, such as strong winds caused by cold fronts in spring, typhoons in coastal areas, and monsoons, will further aggravate the intensity and scope of wind-blown sand flows, becoming natural triggers for wind and sand hazards in farmland.

[0003] However, in the prevention of wind and sand damage in farmland, some existing devices use fence-like nets to block sand particles from passing through. However, this still exposes seedlings in the farmland to strong winds, causing them to break. In addition, farmland plants need a certain amount of wind to grow. Therefore, a device for preventing wind and sand damage in farmland and its usage method are needed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the aforementioned technical problems in the prior art by proposing a device and method for preventing wind and sand damage in farmland.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A device for preventing wind and sand damage in farmland and its method of use include a sand-shielding plate and a support frame. A windward box is fixedly connected to one side of the sand-shielding plate. A connecting frame is installed above the windward box. A fan is rotatably connected to the connecting frame. A connecting rod is fixedly connected to one side of the fan. A first bevel gear is driven by the connecting rod. The first bevel gear meshes with a second bevel gear. A fixing block is fixedly connected above the second bevel gear. A mounting block is driven by the fixing block. The mounting block is fixedly connected to a reciprocating threaded rod. The threaded rod is connected to a movable bar. A diversion pipe is symmetrically arranged on the side of the movable bar away from the sand shield. A motor is fixedly connected to the outside of the diversion pipe. A one-way threaded rod is fixedly connected to the output end of the motor. A shielding groove is threadedly connected to the one-way threaded rod. Air outlets are symmetrically arranged on both sides of the shielding groove. The diversion pipe is slidably connected to the shielding groove. Air outlets with the same size as the air outlets are opened on both sides of the diversion pipe. The diversion pipe is connected to a windproof box. A filter plate communicating with the windproof box is opened on the surface of the sand shield.

[0006] The above technical solution further includes: The connecting frame is rotatably connected to the connecting rod, the connecting rod is driven by a first transmission belt, the end of the moving bar away from the connecting rod is driven by a first bevel gear, one end of the first bevel gear is fixedly connected to a connecting column, the connecting column is rotatably connected to the sand shield, the fixing block is driven by a second transmission belt, the end of the second transmission belt away from the fixing block is driven by an installation block, the installation block is rotatably connected to a connecting block, and the connecting block is fixed to the side of the sand shield.

[0007] The side of the sand shield is fixedly connected to a plug, and the side of the support frame is symmetrically provided with slots, the slots being used for inserting the plug.

[0008] This structure allows for the quick assembly and disassembly of the sand-shielding plate and the support frame through the interlocking of the plug and slot. This makes it easy for farmers to flexibly adjust the protective layout of the device according to the planting area of ​​the farmland, and also allows for quick storage of the device during the non-sandstorm season to reduce the space occupied. At the same time, the plug-in structure can enhance the connection stability between the sand-shielding plate and the support frame, prevent the two from separating due to strong wind impact, and ensure the overall windproof and sand-blocking effect of the device.

[0009] The sand shield has a partition inside.

[0010] The partition can divide the internal space of the sand shield. On the one hand, it can initially guide the airflow through the filter plate, avoid the airflow from forming turbulence inside the sand shield, and ensure that the airflow can enter the windward box smoothly. On the other hand, it can enhance the structural strength of the sand shield itself, prevent the sand shield from deforming under the long-term action of strong wind, and extend the service life of the device. In addition, the sides of the partition are sealed to prevent airflow from overflowing. The sealing plate is not shown in the figure.

[0011] The air intake box is connected to an airflow delivery pipe, and a diversion pipe is fixedly connected to the end of the airflow delivery pipe away from the air intake box.

[0012] The air intake box can collect the airflow passing through the filter plate and then stably deliver the airflow to the distribution pipe through the airflow delivery pipe, realizing the directional transmission and uniform distribution of airflow, ensuring that the airflow can be accurately blown to the seedling area; at the same time, the distribution pipe can disperse the concentrated airflow into multiple gentle breezes, avoiding the impact of a single strong airflow on the seedlings, thus taking into account both ventilation needs and seedling protection.

[0013] The sand shield is provided with a hoof block on the side for supporting the rotation of the reciprocating threaded rod, and the moving bar is slidably connected to the sand shield.

[0014] The hoof blocks provide stable rotational support for the reciprocating threaded rod, ensuring the operational stability of the transmission structure; the sliding fit between the moving strip and the sand shield ensures that the moving strip drives the diversion pipe to move up and down along a fixed trajectory, achieving uniform airflow to the entire seedling, allowing all parts of the seedling stem to receive gentle breeze stimulation, and improving the overall toughness of the stem.

[0015] Both the sand shield and the bottom of the support frame are equipped with insert rods for insertion into the soil.

[0016] The poles can firmly fix the sand-shielding plate and support frame in the farmland soil, preventing strong winds from blowing the entire device over or moving it, and ensuring that the device is always in the preset protective position; at the same time, the poles can be inserted deep into the soil to enhance the wind resistance of the device, and even in the event of strong winds and sandstorms, the integrity of the protective structure of the device can be maintained to protect seedlings from wind and sand damage.

[0017] A space for airflow is provided between the sand shield and the partition.

[0018] This reserved space provides a dedicated airflow channel for the air in the sandstorm airflow, achieving a separation effect of sand particle interception and airflow passage. It not only blocks sand particles through the filter plate, but also allows the airflow to smoothly enter the subsequent conveying structure. At the same time, this space can buffer and decelerate the airflow, initially reducing the wind speed of strong winds, reducing the impact of airflow on subsequent pipelines, and ensuring the stable operation of the airflow transmission system.

[0019] The airflow delivery pipe is expandable.

[0020] The retractable airflow delivery pipe can adapt to the displacement changes of the diverter pipe as it moves up and down with the moving strip, preventing the diverter pipe from being pulled or torn when it moves, thus ensuring the continuity of airflow transmission. At the same time, the retractable structure facilitates the folding and storage of the entire device, reducing the storage space occupied when the device is not in use and improving the practicality and flexibility of the device.

[0021] The present invention has the following beneficial effects: 1. In this invention, the device can effectively block sand particles in the wind and sand flow through the filter plate, avoiding sand particles from eroding and burying the seedlings. At the same time, after the wind passes through the wind-facing box and the airflow delivery pipe into the diversion pipe, it can drive the shielding groove pipe to slide through the motor-driven one-way threaded rod. The size of the ventilation opening can be adjusted by the misalignment of the air outlet and the airflow outlet. The strong wind speed can be reduced as needed to prevent the seedling stems from breaking, and a suitable breeze can also be retained. This solves the defect of the traditional fence-type device that only blocks sand but does not control the wind, and balances the wind protection against wind hazards and the seedlings' need for wind power.

[0022] 2. In this invention, the device uses wind power to drive the fan, which, through a transmission structure including a connecting rod, a first transmission belt, bevel gear meshing, and a second transmission belt, drives the reciprocating threaded rod to rotate. This causes the moving strip to drive the diversion pipe to move up and down along the seedling, allowing the stem of the seedling from the base to the top to receive uniform mechanical stimulation from the breeze. This promotes the synthesis of cellulose and lignin in the stem, prevents the seedling from becoming leggy, and improves the seedling's resistance to lodging in the later stages. This also makes up for the shortcomings of traditional fixing devices, which can only provide localized airflow and have uneven stem toughness. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a device for preventing wind and sand damage in farmland and its usage method proposed in this invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the back structure in this invention; Figure 4 This is a top view of the structure in this invention; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 This is a partial structural diagram of the present invention; Figure 7 for Figure 6 Enlarged diagram of point C in the middle.

[0024] In the diagram: 1. Sand shield; 2. Support frame; 3. Insert block; 4. Slot; 5. Connecting frame; 6. Fan; 7. Connecting rod; 8. First transmission belt; 9. First bevel gear; 10. Second bevel gear; 11. Fixing block; 12. Connecting block; 13. Second transmission belt; 14. Mounting block; 15. Airflow delivery pipe; 16. Air inlet box; 17. Reciprocating threaded rod; 18. Moving bar; 19. Diverter pipe; 20. Airflow outlet; 21. Air outlet; 22. Shielding groove pipe; 23. One-way threaded rod; 24. Motor; 25. Filter plate; 26. Partition plate; 27. Connecting column. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1-7 As shown, this invention is a device for preventing wind and sand damage in farmland and its usage method, including a sand-shielding plate 1 and a support frame 2. A windproof box 16 is fixedly connected to one side of the sand-shielding plate 1. A connecting frame 5 is provided above the windproof box 16. A fan 6 is rotatably connected to the connecting frame 5. A connecting rod 7 is fixedly connected to one side of the fan 6. A first bevel gear 9 is driven by the connecting rod 7. A second bevel gear 10 is meshed with the first bevel gear 9. A fixing block 11 is fixedly connected above the second bevel gear 10. An installation block 14 is driven by the fixing block 11. The installation block 14 is fixedly connected to a reciprocating threaded rod 17. The reciprocating threaded rod 17 is screwed... A movable strip 18 is connected to the sand shield 1. A diversion pipe 19 is symmetrically arranged on the side of the movable strip 18 away from the sand shield 1. A motor 24 is fixedly connected to the outside of the diversion pipe 19. A one-way threaded rod 23 is fixedly connected to the output end of the motor 24. A shielding groove pipe 22 is threadedly connected to the one-way threaded rod 23. An air outlet 21 is symmetrically arranged on both sides of the shielding groove pipe 22. The diversion pipe 19 is slidably connected to the shielding groove pipe 22. An air outlet 20 with the same size as the air outlet 21 is opened on both sides of the diversion pipe 19. The diversion pipe 19 is connected to the windproof box 16. A filter plate 25 communicating with the windproof box 16 is opened on the surface of the sand shield 1.

[0027] In one embodiment, for the connecting frame 5, the connecting frame 5 is rotatably connected to the connecting rod 7, the connecting rod 7 is driven by a first transmission belt 8, the end of the moving bar 18 away from the connecting rod 7 is driven by a first bevel gear 9, one end of the first bevel gear 9 is fixedly connected to a connecting column 27, the connecting column 27 is rotatably connected to the sand shield 1, the fixing block 11 is driven by a second transmission belt 13, the end of the second transmission belt 13 away from the fixing block 11 is driven by a mounting block 14, the mounting block 14 is rotatably connected to a connecting block 12, and the connecting block 12 is fixed to the side of the sand shield 1.

[0028] In one embodiment, for the aforementioned sand shield 1, a plug 3 is fixedly connected to the side of the sand shield 1, and slots 4 are symmetrically opened on the side of the support frame 2, with the slots 4 used for the insertion of the plug 3.

[0029] In this embodiment, the structure enables the quick assembly and disassembly of the sand shield 1 and the support frame 2 through the plug-in cooperation of the plug block 3 and the slot 4. This allows farmers to flexibly adjust the protective layout of the device according to the planting area of ​​the farmland, and also allows the device to be quickly stored during the non-sandstorm season to reduce the land occupation. At the same time, the plug-in structure can enhance the connection stability between the sand shield 1 and the support frame 2, avoid the separation of the two due to strong wind impact, and ensure the overall windproof and sand-blocking effect of the device.

[0030] In one embodiment, the sand shield 1 is provided with a partition 26 inside.

[0031] In this embodiment, the partition 26 can divide the internal space of the sand shield 1. On the one hand, it can initially guide the airflow through the filter plate 25 to avoid the airflow forming turbulence inside the sand shield 1 and ensure that the airflow can enter the windproof box 16 smoothly. On the other hand, it can enhance the structural strength of the sand shield 1 itself, prevent the sand shield 1 from deforming under the long-term action of strong wind, and extend the service life of the device. In addition, the side of the partition 26 is sealed to prevent airflow from overflowing. The sealing plate is not shown in the figure.

[0032] In one embodiment, for the aforementioned windproof box 16, the windproof box 16 is connected to an airflow delivery pipe 15, and a diversion pipe 19 is fixedly connected to the end of the airflow delivery pipe 15 away from the windproof box 16.

[0033] In this embodiment, the wind-receiving box 16 can collect the airflow passing through the filter plate 25, and then stably deliver the airflow to the diversion pipe 19 through the airflow delivery pipe 15, realizing the directional transmission and uniform distribution of airflow, ensuring that the airflow can be accurately blown to the seedling area; at the same time, the diversion pipe 19 can disperse the concentrated airflow into multiple gentle breezes, avoiding the impact of a single strong airflow on the seedlings, thus taking into account both ventilation needs and seedling protection.

[0034] In one embodiment, for the aforementioned sand shield 1, a hoof block is provided on the side of the sand shield 1 for supporting the reciprocating threaded rod 17 to rotate, and the moving bar 18 is slidably connected to the sand shield 1.

[0035] In this embodiment, the hoof block can provide stable rotational support for the reciprocating threaded rod 17, ensuring the operational stability of the transmission structure; the sliding cooperation between the moving strip 18 and the sand shield 1 can ensure that the moving strip 18 drives the diversion pipe 19 to move up and down along a fixed trajectory, realizing uniform air supply to the whole seedling, allowing all parts of the seedling stem to receive the stimulation of a breeze, and improving the overall toughness of the stem.

[0036] In one embodiment, for the aforementioned sand-shielding plate 1, both the sand-shielding plate 1 and the support frame 2 are provided with a rod for inserting into the soil at their bottoms.

[0037] In this embodiment, the insertion rod can firmly fix the sand shield 1 and the support frame 2 in the farmland soil, preventing strong winds from blowing the entire device over or moving it, and ensuring that the device is always in the preset protective position; at the same time, the insertion rod can penetrate deep into the soil to enhance the wind resistance of the device, and even in the event of strong winds and sandstorms, it can maintain the integrity of the protective structure of the device and protect the seedlings from wind and sand damage.

[0038] In one embodiment, for the aforementioned sand shield 1, a space for airflow is provided between the sand shield 1 and the partition 26.

[0039] In this embodiment, the reserved space provides a dedicated flow channel for air in the sandstorm airflow, which can achieve the separation effect of sand particle interception and airflow passage. It can block sand particles through the filter plate 25 and allow airflow to smoothly enter the subsequent conveying structure. At the same time, the space can buffer and decelerate the airflow, initially reduce the wind speed of strong winds, reduce the impact of airflow on subsequent pipelines, and ensure the stable operation of the airflow transmission system.

[0040] In one embodiment, the airflow delivery pipe 15 described above has a retractable characteristic.

[0041] In this embodiment, the retractable airflow delivery pipe 15 can adapt to the displacement changes of the diversion pipe 19 as it moves up and down with the moving bar 18, preventing the diversion pipe 19 from pulling or tearing the airflow delivery pipe 15 when it moves, thus ensuring the continuity of airflow transmission. At the same time, the retractable structure facilitates the folding and storage of the entire device, reducing the storage space occupied when the device is idle and improving the practicality and flexibility of the device.

[0042] The working principle of the device for preventing wind and sand damage in farmland in this invention is as follows: First, the support frame 2 is inserted into the soil using the bottom insert. Then, the insert block 3 on the side of the sand shield 1 is slid into the slot 4. Inserts are also provided at the bottom of the sand shield 1. After inserting the insert block 3 on the side of the sand shield 1 into the slot 4, the insert is then inserted into the soil.

[0043] When sandstorms occur, the sand particles are blocked by the filter plate 25 on the surface of the sand shield 1, and then slide down along the smooth side surface. Simultaneously, the sand particles are accompanied by wind, which passes through the filter plate 25 into the wind-facing box 16. The wind then flows through the airflow delivery pipe 15 into the diversion pipe 19, and then blows towards the seedlings through the opening formed by the airflow outlet 20 and the air outlet 21. Therefore, when the seedlings require a smaller wind, the motor 24 is rotated. The output of the motor 24 drives the one-way threaded rod 23 to rotate, which in turn causes the shielding groove tube 22 to slide inside the diversion pipe 19. The air outlets 21 symmetrically opened on the side of the shielding groove tube 22 are identical to the airflow outlets 20 symmetrically opened on the diversion pipe 19. When the shielding groove tube 22 moves, the air outlets 21 and 20 are misaligned, thus creating a passage between them. As the shielding trough 22 slides, the air vents become smaller and smaller, allowing the seedlings to adjust the wind intensity when needed. Simultaneously, the wind blows on the motor fan 6. When the motor fan 6 rotates, it drives the first bevel gear 9 to rotate via the connecting rod 7 and the first transmission belt 8. The first bevel gear 9 then meshes with the second bevel gear 10, which in turn drives the fixed block 11 to rotate. The rotation of the fixed block 11 drives the mounting block 14 to rotate via the second transmission belt 13. The mounting block 14 then drives the reciprocating threaded rod 17 to rotate. The rotation of the reciprocating threaded rod 17 causes its moving strip 18 to move up and down along one side of the shielding plate 1. The moving strip 18 then drives the diverter pipe 19 to blow air onto the entire seedling, thereby increasing the synthesis of cellulose and lignin in the seedling stem, making the stem thicker and stronger, improving the seedling's resistance to lodging in the later stages, and preventing it from becoming leggy.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for preventing wind and sand damage in farmland, characterized in that, Includes a sand shield (1) and a support frame (2). A windproof box (16) is fixedly connected to one side of the sand shield (1). A connecting frame (5) is provided above the windproof box (16). The connecting frame (5) is rotatably connected to an organic fan (6). A connecting rod (7) is fixedly connected to one side of the organic fan (6). The connecting rod (7) is driven by a first bevel gear (9). The first bevel gear (9) is meshed with a second bevel gear (10). A fixing block (11) is fixedly connected above the second bevel gear (10). The fixing block (11) is driven by an installation block (14). The installation block (14) is fixedly connected to a reciprocating threaded rod (17). The reciprocating threaded rod (17) is threadedly connected to a moving strip (18). A diversion pipe (19) is symmetrically arranged on the side of the moving strip (18) away from the sand shield (1). A motor (24) is fixedly connected to the outside of the diversion pipe (19). A one-way threaded rod (23) is fixedly connected to the output end of the motor (24). A shielding groove pipe (22) is threadedly connected to the one-way threaded rod (23). An air outlet (21) is symmetrically arranged on both sides of the shielding groove pipe (22). The diversion pipe (19) is slidably connected to the shielding groove pipe (22). An airflow outlet (20) with the same size as the air outlet (21) is opened on both sides of the diversion pipe (19). A windproof box (16) is connected to the diversion pipe (19). A filter plate (25) communicating with the windproof box (16) is opened on the surface of the sand shield (1).

2. The device for preventing wind and sand damage to farmland according to claim 1, characterized in that, The connecting frame (5) is rotatably connected to the connecting rod (7). The connecting rod (7) is driven by a first transmission belt (8). The end of the moving bar (18) away from the connecting rod (7) is driven by a first bevel gear (9). One end of the first bevel gear (9) is fixedly connected to a connecting column (27). The connecting column (27) is rotatably connected to the sand shield (1). The fixed block (11) is driven by a second transmission belt (13). The end of the second transmission belt (13) away from the fixed block (11) is driven by an installation block (14). The installation block (14) is rotatably connected to a connecting block (12). The connecting block (12) is fixed to the side of the sand shield (1).

3. The device for preventing wind and sand damage to farmland according to claim 1, characterized in that, The sand shield (1) has a fixed connection to a plug (3) on its side, and the support frame (2) has symmetrical slots (4) on its side, and the slots (4) are used for the insertion of the plug (3).

4. The device for preventing wind and sand damage to farmland according to claim 1, characterized in that, The sand shield (1) has a partition (26) inside.

5. The device for preventing wind and sand damage in farmland according to claim 1, characterized in that, The air intake box (16) is connected to an airflow delivery pipe (15), and a diversion pipe (19) is fixedly connected to one end of the airflow delivery pipe (15) away from the air intake box (16).

6. The device for preventing wind and sand damage to farmland according to claim 1, characterized in that, The side of the sand shield (1) is provided with a hoof block for supporting the rotation of the reciprocating threaded rod (17), and the moving bar (18) is slidably connected to the sand shield (1).

7. The device for preventing wind and sand damage to farmland according to claim 1, characterized in that, Both the sand shield (1) and the support frame (2) are equipped with insert rods for insertion into the soil at their bottoms.

8. The device for preventing wind and sand damage to farmland according to claim 1, characterized in that, A space for airflow is provided between the sand shield (1) and the partition (26).

9. A device for preventing wind and sand damage in farmland according to claim 5, characterized in that, The airflow delivery pipe (15) is retractable.

10. The method of using the device for preventing wind and sand damage in farmland according to claim 1, characterized in that, Includes the following steps: Step 1: Move the sand shield (1) and support frame (2) to the upwind side of the farmland where sandstorms are expected. Adjust the placement of the sand shield (1) and support frame (2) according to the spacing of the seedling planting rows to ensure that the sand shield (1) can fully cover the seedling protection area. Then insert the bottom rods of the sand shield (1) and support frame (2) into the soil to achieve stable fixation of the device and avoid the device from shifting due to strong wind impact. Confirm that the sand shield (1) and support frame (2) are tightly connected and the shielding groove (22) is in the initial position. At this time, the air outlet (21) on the shielding groove (22) and the air outlet (20) on the diversion pipe (19) are completely aligned and the ventilation is in the maximum open state. At the same time, check that the fan (6) and reciprocating threaded rod (17) are not stuck to ensure that the device can operate normally. Step 2: When the sandstorm arrives, the sand particles are intercepted by the filter plate (25) on the surface of the sand shield (1), preventing the sand particles from directly attacking the seedlings. The intercepted sand particles slide down the smooth side of the sand shield (1), while the airflow passes through the filter plate (25) and enters the interior of the sand shield (1). After being guided through the space between the sand shield (1) and the partition plate (26), the airflow enters the windward box (16), and then is transported to the diversion pipe (19) through the airflow delivery pipe (15). Finally, it passes through the air outlet (21) and the airflow outlet (20). The ventilation openings formed by the wind blow towards the seedlings. Depending on the seedlings' growth stage and their wind requirements, if it is necessary to reduce the wind force blowing towards the seedlings, the motor (24) is started. The output end of the motor (24) drives the one-way threaded rod (23) to rotate. The one-way threaded rod (23) drives the shielding groove tube (22) to slide inside the diversion tube (19), causing the air outlet (21) on the shielding groove tube (22) to be misaligned with the air outlet (20) on the diversion tube (19). The ventilation opening area gradually decreases with the degree of misalignment. Once the wind force drops to a level suitable for seedling growth, turn off the motor (24). If it is necessary to increase the wind force, start the motor (24) in reverse so that the air outlet (21) and the air outlet (20) are aligned. The airflow accompanied by the sand blows the fan (6) connected to the connecting frame (5). The fan (6) rotates and drives the connecting rod (7) to rotate. The connecting rod (7) drives the first bevel gear (9) to rotate through the transmission structure. The first bevel gear (9) meshes with the second bevel gear (10) and drives the fixed block (11) to rotate. The fixed block (11) drives the mounting block (14) to rotate through the transmission action. The mounting block (14) drives the reciprocating threaded rod (17) to rotate under the support of the hoof block on the side of the sand shield (1). The rotation of the reciprocating threaded rod (17) drives the moving strip (18) connected to it to slide along the sand shield (1). The moving strip (18) drives the diverter pipe (19) to move up and down, so as to achieve uniform air supply to the whole seedling and promote the improvement of the seedling stem toughness. Step 3: During non-sandstorm seasons or after crop harvest, turn off the motor (24), reset the shielding trough (22), then pull out the plug at the bottom of the sand shielding plate (1) and the support frame (2), disassemble the connection between the sand shielding plate (1) and the support frame (2), clean the sand particles accumulated on the surface of the filter plate (25), check whether each component is worn, replace or repair the worn parts, and store the device components to reduce the footprint and extend the service life of the device.

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