Automatic pesticide spraying device suitable for forestry maintenance

Abstract

The invention relates to the technical field of forestry maintenance, and discloses an automatic pesticide spraying device suitable for forestry maintenance, the automatic pesticide spraying device comprises an unmanned aerial vehicle, the bottom side of the unmanned aerial vehicle is sequentially connected with a second connecting box and a first connecting box, the inner side of the second connecting box is movably connected with a screw rod through a bearing, and the outer side of the screw rod is in threaded connection with a rubber piston; the rubber piston divides the inner side of the second connecting box into a medicine storage cavity and a water storage cavity, and a motor for driving the screw to rotate is installed on the outer side of the second connecting box. By adjusting the concentration of the pesticide liquid in the pesticide box, the spraying concentration of the pesticide liquid can be accurately controlled according to the flight condition of the unmanned aerial vehicle and the change of crop insect pest conditions, and reasonable use of the pesticide is ensured. Compared with the prior art, the device can effectively prevent the problem that pesticide liquid is sprayed unevenly, and the problem that crops and other animals and plants die or grow badly due to the fact that the pesticide spraying amount is too large due to the fact that the speed is reduced when the unmanned aerial vehicle makes a turn is solved.

Description

Technical Field

[0001] The invention relates to the technical field of forestry maintenance, in particular to an automatic pesticide spraying device suitable for forestry maintenance. Background Art

[0002] In forestry maintenance, automated spraying devices are widely used in pest control to improve work efficiency and reduce labor costs. In the prior art, automated spraying devices usually use drones to spray drugs. The drone operates according to a preset path during flight and sprays a certain amount of liquid medicine to achieve a control effect. However, the prior art still has several problems in practical applications, especially in the uniformity of liquid medicine spraying and the control of liquid medicine concentration. First, the terrain in the forest area is complex and changeable, and the trees are dense, which causes the drone to frequently turn or change the flight direction when performing tasks. Since the drone is slow when turning, the amount of medicine sprayed in the turning area is often too large, resulting in excessive spraying of medicine in the area, which not only causes unnecessary damage to crops and surrounding vegetation, but also may cause excessive pesticide residues, affecting the quality of agricultural products and the safety of consumers. Secondly, the amount of liquid medicine sprayed in the prior art cannot be adjusted in real time according to the needs of different regions, and there is often uneven spraying. Especially in the case of large changes in flight altitude and speed, the inaccurate control of liquid medicine concentration may lead to drug waste, increase the cost of drug use, and have adverse effects on the environment.

[0003] To this end, those skilled in the art have proposed an automated spraying device suitable for forestry maintenance to solve the above problems. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides an automatic spraying device suitable for forestry maintenance, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an automated pesticide spraying device suitable for forestry maintenance, comprising a drone, the bottom side of the drone is sequentially connected with a connecting box 2 and a connecting box 1, the inner side of the connecting box 2 is movably connected with a screw rod through a bearing, the outer side of the screw rod is threadedly connected with a rubber piston, the rubber piston divides the inner side of the connecting box 2 into a drug storage chamber and a water storage chamber, a motor for driving the screw rod to rotate is installed on the outer side of the connecting box 2, two traction ropes 2 are fixedly connected to the outer side of the rubber piston, the inner wall of the connecting box 1 is provided with two installation chambers, the interior of the installation chamber is fixedly connected with a limiting plate, the outer sleeve of the traction rope 2 is provided with a reset spring, one end of the traction rope 2 is fixedly connected with a movable plate, and the top wall of the connecting box 1 is provided with two liquid outlet chambers.

[0006] Preferably, a transmission shaft is rotatably installed on the inner side of the connecting box 1, an impeller is fixedly connected to one side of the transmission shaft, a bevel gear 1 is fixedly connected to the other side of the transmission shaft, the inner bottom wall of the connecting box 1 is movably connected to the rotating shaft through a bearing, a bevel gear 2 is fixedly connected to the top of the rotating shaft, the outer side of the bevel gear 2 is meshingly connected to the outer side of the bevel gear 1, a stirring frame is fixedly connected to the outer side of the rotating shaft, and the bottom of the connecting box 1 is connected to a transport pipe.

[0007] Preferably, the bottom end of the connecting box is fixedly connected to a fixed plate, the outer surface of the fixed plate is fixedly connected to a limiting frame, the inner side of the limiting frame is slidably connected to a driving rack, an electric telescopic rod is installed on the outer side of the fixed plate, the output end of the electric telescopic rod is fixedly connected to one side of the driving rack, and a driving gear is installed on the outer side of the fixed plate through a rotating shaft.

[0008] Preferably, a rotating disk is installed inside the fixed disk, and three arc rods are rotatably connected to the outer side of the rotating disk, three guide rods are fixedly connected to the inside of the fixed disk, a slider is slidably provided on the outside of the guide rod, a traction rope is fixedly connected to the outer side of the slider, a mounting disk is fixedly connected to the bottom of the fixed disk, three articulated seats are fixedly connected to the outer side of the mounting disk, and three connecting nozzles are connected to the outer side of the articulated seat via a torsion spring.

[0009] Preferably, the outer side of the driving gear is meshingly connected with the outer side of the driving rack, and the driving gear is fixedly connected with the outer side of the rotating disk via a rotating shaft.

[0010] Preferably, the other ends of the three traction ropes are respectively connected to the outer sides of the connecting nozzles at corresponding positions, and the three connecting nozzles are connected to the transport pipe through the injection pipe.

[0011] Preferably, one end of the return spring is fixedly connected to the outer side of the movable plate, the other end of the return spring is fixedly connected to the outer side of the limit plate, and the outer surface of the movable plate is slidably connected to the inner wall of the installation cavity.

[0012] Preferably, outer sides of the plurality of arc-shaped rods are rotatably connected to outer sides of sliders at corresponding positions respectively, three sliding grooves are provided on the outer surface of the fixed plate, and the outer surface of the slider is slidably connected to the inner wall of the sliding groove.

[0013] The present invention provides an automatic spraying device suitable for forestry maintenance, which has the following beneficial effects: 1. The present invention adjusts the concentration of the liquid medicine in the medicine box to accurately control the spraying concentration of the liquid medicine according to the flight conditions of the drone and the changes in the crop pest conditions, thereby ensuring the rational use of the medicine. Compared with the prior art, the present device can effectively prevent the problem of uneven spraying of the liquid medicine, and avoid the problem of excessive spraying of the medicine due to the slowing down of the speed of the drone when turning, which in turn causes the death or poor growth of crops and other plants and animals.

[0014] 2. The present invention can flexibly adjust the angle of the nozzle according to different forestry maintenance needs, accurately control the spraying direction and range of the drug, and ensure that the drug can cover every corner of the forest, especially for those hard-to-reach areas such as the top of the tree canopy and the gaps between the forests. This improvement not only improves the coverage effect of drug spraying, reduces drug waste caused by uneven spraying, but also effectively reduces the impact on the surrounding environment and other vegetation, and reduces unnecessary drug pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A perspective view of the present invention; Figure 2 It is a schematic diagram of the structure of the jet pipe of the present invention; Figure 3 It is a schematic diagram of the structure of the installation disk of the present invention; Figure 4 It is a schematic diagram of the fixed disk structure of the present invention; Figure 5 It is a schematic diagram of the structure of the connecting nozzle of the present invention; Figure 6 A cross-sectional view of a connection box of the present invention; Figure 7 for Figure 6 The enlarged view of point A in the middle; Figure 8 It is a cross-sectional view of the fixed disk of the present invention.

[0016] Among them, 1. UAV; 2. Connection box 1; 3. Fixed plate; 401. Electric telescopic rod; 402. Limiting frame; 403. Driving rack; 404. Driving gear; 501. Connecting nozzle; 502. Articulated seat; 503. Traction rope 1; 504. Mounting plate; 505. Jet pipe; 506. Rotating plate; 507. Arc rod; 508. Guide rod; 509. Slider; 6. Connection box 2; 701. Rubber piston; 702. Screw; 703. Traction rope 2; 704. Moving plate; 705. Liquid outlet chamber; 706. Return spring; 707. Mounting chamber; 708. Limiting plate; 801. Impeller; 802. Transmission shaft; 803. Mixing frame; 804. Rotating shaft; 805. Transport pipe. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0018] Please see attached Figure 1 - Attachment Figure 8 The embodiment of the present invention is applicable to an automatic spraying device for forestry maintenance, including a drone 1, the bottom side of the drone 1 is sequentially connected with a connection box 2 6 and a connection box 1 2, the inner side of the connection box 2 6 is movably connected with a screw rod 702 through a bearing, the outer side of the screw rod 702 is threadedly connected with a rubber piston 701, the rubber piston 701 divides the inner side of the connection box 2 6 into a medicine storage chamber and a water storage chamber, a motor for driving the screw rod 702 to rotate is installed on the outer side of the connection box 2 6, two traction ropes 2 703 are fixedly connected to the outer side of the rubber piston 701, the inner wall of the connection box 1 2 is provided with two installation cavities 707, the interior of the installation cavity 707 is fixedly connected with a limit plate 708, the outer sleeve of the traction rope 2 703 is provided with a reset spring 706, one end of the traction rope 2 703 is fixedly connected with a moving plate 704, and the top wall of the connection box 1 2 is provided with two liquid outlet cavities 705.

[0019] Specifically, the UAV 1 is the core platform responsible for flight and spraying operations. The connection box 1 2 is connected to the bottom of the UAV 1 and serves as a liquid medicine storage and spraying control module; the connection box 2 6 is located between the connection box 1 2 and the UAV 1 and plays a role in adjusting the concentration of the liquid medicine.

[0020] The function of the screw 702 and the rubber piston 701 is: the motor drives the screw 702 to rotate, driving the rubber piston 701 to move along the screw, thereby adjusting the concentration of the liquid medicine inside the connection box 2 6. The rubber piston 701 divides the connection box 2 6 into a medicine storage chamber and a water storage chamber, and changes the ratio of liquid medicine to water as needed to adjust the concentration of the liquid medicine. The installation chamber 707 is fixedly connected to the limit plate 708, which is used to ensure the proper tension of the traction rope 2 703 and the correct positioning of the moving plate 704, so as to achieve accurate delivery of the liquid medicine.

[0021] After the drone 1 is started and enters the spraying operation, the camera installed on the outside of the drone 1 is first used to monitor the forest area, especially the insect pests on the leaves. Through the real-time feedback of the camera, the system can automatically determine whether the insect pests are serious. When the camera detects that the insect pests in a certain area are too heavy, the system automatically starts the motor to drive the screw 702 to rotate, drive the rubber piston 701 to move along the screw, and push the liquid medicine in the medicine storage chamber into the connection box 2, thereby increasing the concentration of the liquid medicine in the area to meet the prevention and control needs of the area. As the rubber piston 701 moves, the traction rope 703 is also driven, and then drives the moving plate 704 to move in the installation cavity 707, thereby pushing the liquid medicine in the medicine storage cavity through the liquid outlet cavity 705 into the connection box 2, ensuring efficient delivery of the liquid medicine. When the drone 1 needs to turn, the system will reverse the motor, drive the screw 702 and the rubber piston 701 to move toward the water storage cavity, allowing the pure water in the storage cavity to enter the connection box 2, thereby reducing the concentration of the liquid medicine. At this time, the spraying system can still maintain a stable spraying volume and effect of the liquid medicine, avoiding excessive spraying volume or unbalanced concentration when turning.

[0022] The mechanism can dynamically adjust the concentration and spraying volume of the liquid medicine by precisely controlling the liquid medicine concentration according to the changes in different pest areas and the flight status of the drone 1. This not only effectively improves the efficiency of drug use and avoids environmental pollution or crop damage caused by excessive spraying, but also optimizes the use of pesticides according to actual needs and reduces drug waste. In addition, through a unique control mechanism, the device solves the problem of unstable liquid medicine spraying volume when the drone 1 turns, ensuring uniform and accurate spraying during the operation.

[0023] A transmission shaft 802 is rotatably installed on the inner side of the connecting box 2, an impeller 801 is fixedly connected to one side of the transmission shaft 802, a bevel gear 1 is fixedly connected to the other side of the transmission shaft 802, a rotating shaft 804 is movably connected to the inner bottom wall of the connecting box 2 through a bearing, a bevel gear 2 is fixedly connected to the top of the rotating shaft 804, the outer side of the bevel gear 2 is meshed with the outer side of the bevel gear 1, a stirring frame 803 is fixedly connected to the outer side of the rotating shaft 804, and a transport pipe 805 is connected to the bottom of the connecting box 2.

[0024] Specifically, the impeller 801 is fixed to one side of the transmission shaft 802, and the impeller 801 plays a role in driving the transmission shaft 802 to rotate during the liquid flow process. The rotation of the impeller 801 can drive the transmission shaft 802 to rotate synchronously, which is the starting power of the entire mixing process. Bevel gear 1 is located at the other end of the transmission shaft 802 and is fixedly connected to the transmission shaft 802. Its function is to cooperate with bevel gear 2 to transmit the rotational force through gear meshing. The stirring frame 803 is fixed to the outside of the rotating shaft 804, and the rotation of the rotating shaft 804 drives the stirring frame 803 to perform stirring action. The stirring frame 803 is responsible for stirring the liquid medicine inside the connection box 2, thereby achieving the mixing of the liquid, and ensuring that the liquid medicine can be evenly distributed through good mixing.

[0025] A fixed disk 3 is fixedly connected to the bottom end of the connecting box 12, and a limiting frame 402 is fixedly connected to the outer surface of the fixed disk 3, and a driving rack 403 is slidably connected to the inner side of the limiting frame 402. An electric telescopic rod 401 is installed on the outer side of the fixed disk 3, and the output end of the electric telescopic rod 401 is fixedly connected to one side of the driving rack 403. A driving gear 404 is installed on the outer side of the fixed disk 3 through a rotating shaft, and a rotating disk 506 is installed inside the fixed disk 3. Three arc rods 507 are rotatably connected to the outer side of the rotating disk 506. Three guide rods 508 are fixedly connected to the inside of the fixed disk 3, and a slider 509 is slidably provided on the outside of the guide rod 508. A traction rope 1 503 is fixedly connected to the outer side of the slider 509, and a mounting disk 504 is fixedly connected to the bottom of the fixed disk 3. Three hinged seats 502 are fixedly connected to the outer side of the hinged seat 502, and three connecting nozzles 501 are connected to the outer side of the hinged seat 502 through a torsion spring. The outer side of the driving gear 404 is meshed with the outer side of the driving rack 403, and the driving gear 404 is fixedly connected to the outer side of the rotating disk 506 through the rotating shaft. The other ends of the three traction ropes 503 are respectively connected to the outer sides of the connecting nozzles 501 at the corresponding positions, and the three connecting nozzles 501 are connected to the transport pipe 805 through the injection pipe 505.

[0026] Specifically, the limit frame 402 is installed on the outer surface of the fixed disk 3, and the function of the limit frame 402 is to limit the range of motion of the drive rack 403, ensuring that the drive rack 403 can only move along a predetermined path. The electric telescopic rod 401 is fixed on the outer side of the fixed disk 3, and its output end is fixedly connected to one side of the drive rack 403. The electric telescopic rod 401 pushes the drive rack 403 to move back and forth by contraction and extension. The curved arc rod 507 is driven to swing by the rotation of the rotating disk 506, which plays a role in changing the angle of the spray nozzle. The guide rod 508 is fixed inside the fixed disk 3, and the slider 509 slides along its outer wall to transmit motion. The traction rope 503 is fixed on the slider 509, connected to the connecting nozzle 501, and is responsible for controlling the position of the nozzle. The hinged seat 502 is installed on the outer side of the mounting disk 504, and is connected to the connecting nozzle 501 through a torsion spring, which helps the nozzle to adjust its position adaptively under the action of the traction rope and the torsion spring.

[0027] The liquid medicine enters the jet pipe 505 through the transport pipe 805 and is sprayed out through the connecting nozzle 501. The key to this process is the effective transportation and spraying of the liquid medicine. The electric telescopic rod 401 is started, and the driving rack 403 is driven to slide along the limit frame 402 by contraction and extension. The movement of the rack drives the driving gear 404 to rotate. The rotation of the driving gear 404 drives the rotating disk 506 to rotate synchronously, and the arc rod 507 on the rotating disk 506 begins to swing. The swing of the arc rod 507 causes the slider 509 to slide along the outer wall of the guide rod 508, thereby driving the movement of the traction rope 503. The movement of the traction rope 503 generates a pulling force, which adjusts the position of the connecting nozzle 501. At the same time, the torsion spring provides a reset effect to ensure the automatic adjustment of the nozzle. In this way, the spraying angle and position of the nozzle can be changed to cover a wider area.

[0028] One end of the return spring 706 is fixedly connected to the outer side of the movable plate 704 , and the other end of the return spring 706 is fixedly connected to the outer side of the limiting plate 708 . The outer surface of the movable plate 704 is slidably connected to the inner wall of the mounting cavity 707 .

[0029] Specifically, the return spring 706 is connected to the moving plate 704 and the limiting plate 708 to ensure that when the moving plate 704 moves, the return spring 706 can restore the moving plate 704 to the initial position through elastic force.

[0030] The outer sides of the plurality of arc-shaped rods 507 are rotatably connected to the outer sides of the sliders 509 at the corresponding positions respectively. The outer surface of the fixed plate 3 is provided with three sliding grooves, and the outer surface of the slider 509 is slidably connected to the inner wall of the sliding groove.

[0031] Specifically, the function of the slide groove is to ensure the stability of the movement of the slider 509 .

[0032] Working principle: The operating principle of this device can be divided into the following steps: Step 1: The pre-mixed medicine is introduced into the medicine storage cavity inside the connection box 2 6 through the medicine inlet pipe, and pure water is injected into the water storage cavity inside the connection box 2 6, and the drone 1 is started to spray the medicine; Step 2: After the drone 1 is started, the spraying process is monitored by the camera outside the drone 1. The camera monitoring system is used to determine whether the forest leaf insect pests are in an overweight area. If it is in an overweight area, the motor outside the connecting box 2 6 is started, and the motor drives the screw 702 to rotate, so that the rubber piston 701 moves along the outer wall of the screw 702 toward the medicine storage chamber. When the rubber piston 701 moves, it will drive one end of the traction rope 2 703 to move. At this time, the moving plate 704 inside the mounting cavity 707 on one side of the medicine storage chamber moves, and the medicine inside the medicine storage chamber enters the inside of the connecting box 2 through the liquid outlet cavity 705, thereby increasing the drug concentration inside the connecting box 2. By changing the drug concentration, it is suitable for areas with different insect pest infection degrees, and targeted pesticide spraying is achieved; Step 3: When the drone 1 needs to turn, the rubber piston 701 is driven to move toward the water storage chamber by reversing the screw 702. Based on the same principle as step 2, the pure water in the storage chamber enters the interior of the connection box 2, thereby reducing the drug concentration in the connection box 2, so that the drug content sprayed by the drone 1 during the turning process remains unchanged; Step 4: When the liquid medicine or pure water is discharged through the liquid outlet cavity 705, the impeller 801 is driven to rotate, which further drives the transmission shaft 802 to rotate coaxially, and the rotating shaft 804 is driven to rotate synchronously under the transmission action of the bevel gear twice, so as to drive the stirring frame 803 to rotate, and the liquid medicine inside the connection box 2 is fully mixed to improve the insecticide effect on forestry; Step 5, the medicine liquid enters the interior of the injection tube 505 through the transport tube 805, and is sprayed out through the connecting nozzle 501. At this time, by starting the electric telescopic rod 401, the output end of the electric telescopic rod 401 contracts back and forth, which will drive the driving rack 403 to move along the inner wall of the limit frame 402. While the driving rack 403 moves, it will drive the driving gear 404 to rotate back and forth. As the driving gear 404 rotates, the rotating disk 506 will rotate synchronously, so that one end of the arc rod 507 swings, and the slider 509 moves along the outer wall of the guide rod 508, which drives one end of the traction rope 503 to be pulled. At this time, the connecting nozzle 501 continuously adjusts its position under the traction force of the traction rope 503 and the resetting action of the torsion spring, thereby improving the coverage effect of the drug spraying and reducing the drug waste caused by uneven spraying.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automated spraying device for forestry maintenance, comprising a drone (1), characterized in that: The bottom side of the drone (1) is connected to a connection box 2 (6) and a connection box 1 (2) in sequence. The inner side of the connection box 2 (6) is movably connected to a screw rod (702) via a bearing. The outer side of the screw rod (702) is threadedly connected to a rubber piston (701). The rubber piston (701) divides the inner side of the connection box 2 (6) into a medicine storage chamber and a water storage chamber. A motor for driving the screw rod (702) to rotate is installed on the outer side of the connection box 2 (6). The outer side of the rubber piston (701) is fixedly connected to two traction ropes 2 (703). The inner wall of the connection box 1 (2) is provided with two installation chambers (707). The interior of the installation chamber (707) is fixedly connected to a limit plate (708). The outer side of the traction rope 2 (703) is provided with a reset spring (706). One end of the traction rope 2 (703) is fixedly connected to a moving plate (704). The top wall of the connection box 1 (2) is provided with two liquid outlet chambers (705).

2. The automatic spraying device suitable for forestry maintenance according to claim 1, characterized in that: A transmission shaft (802) is rotatably mounted on the inner side of the connection box 1 (2); an impeller (801) is fixedly connected to one side of the transmission shaft (802); a bevel gear 1 is fixedly connected to the other side of the transmission shaft (802); a rotating shaft (804) is movably connected to the inner bottom wall of the connection box 1 (2) via a bearing; a bevel gear 2 is fixedly connected to the top of the rotating shaft (804); the outer side of the bevel gear 2 is meshingly connected to the outer side of the bevel gear 1; a stirring frame (803) is fixedly connected to the outer side of the rotating shaft (804); and a transport pipe (805) is connected to the bottom of the connection box 1 (2).

3. The automatic spraying device suitable for forestry maintenance according to claim 1, characterized in that: A fixed plate (3) is fixedly connected to the bottom end of the connection box 1 (2); the outer surface of the fixed plate (3) is fixedly connected to a limiting frame (402); the inner side of the limiting frame (402) is slidably connected to a driving rack (403); an electric telescopic rod (401) is installed on the outer side of the fixed plate (3); the output end of the electric telescopic rod (401) is fixedly connected to one side of the driving rack (403); and a driving gear (404) is installed on the outer side of the fixed plate (3) via a rotating shaft.

4. The automatic spraying device suitable for forestry maintenance according to claim 3, characterized in that: A rotating disk (506) is installed inside the fixed disk (3), and three arc-shaped rods (507) are rotatably connected to the outer side of the rotating disk (506). Three guide rods (508) are fixedly connected to the inside of the fixed disk (3), and a slider (509) is slidably provided outside the guide rod (508). A traction rope (503) is fixedly connected to the outer side of the slider (509). A mounting disk (504) is fixedly connected to the bottom of the fixed disk (3), and three hinged seats (502) are fixedly connected to the outer side of the mounting disk (504). The outer side of the hinged seat (502) is connected to three connection nozzles (501) via a torsion spring.

5. The automatic spraying device suitable for forestry maintenance according to claim 3, characterized in that: The outer side of the driving gear (404) is meshingly connected with the outer side of the driving rack (403), and the driving gear (404) is fixedly connected with the outer side of the rotating disk (506) via a rotating shaft.

6. The automatic spraying device suitable for forestry maintenance according to claim 4, characterized in that: The other ends of the three traction ropes (503) are respectively connected to the outer sides of the connecting nozzles (501) at corresponding positions, and the three connecting nozzles (501) are connected to the transport pipe (805) through the jet pipe (505).

7. The automatic spraying device suitable for forestry maintenance according to claim 1, characterized in that: One end of the return spring (706) is fixedly connected to the outer side of the movable plate (704), the other end of the return spring (706) is fixedly connected to the outer side of the limit plate (708), and the outer surface of the movable plate (704) is slidably connected to the inner wall of the installation cavity (707).

8. The automatic spraying device suitable for forestry maintenance according to claim 4, characterized in that: The outer sides of the plurality of arc-shaped rods (507) are rotatably connected to the outer sides of the sliders (509) at corresponding positions respectively; three sliding grooves are provided on the outer surface of the fixed plate (3); and the outer surface of the slider (509) is slidably connected to the inner wall of the sliding groove.

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