A sampling device for monitoring airborne particulate matter trapped in forests

Abstract

This invention discloses a sampling device for monitoring airborne particulate matter trapped in forests, belonging to the field of airborne particulate matter sampling. It includes a sampling platform and a mobile platform. The sampling platform has an installation slot and multiple storage slots at its top. Two multi-angle robotic arms, used for limiting branch movement and sampling respectively, are connected to the inner end face of the installation slot via an adjustment component. An insulated outer shell is connected to the inner side wall of the storage slots. By adjusting the component and the arrangement of the sample storage tubes, this invention can achieve full spatial coverage of the forest canopy to the ground using three rows of sample storage tubes, revealing the vertical distribution pattern of particulate matter deposition. Each row of seven sample storage tubes covers seven tilt angles from 0° to 90° (upward, horizontal, and downward), quantifying the influence of leaf angle on dust retention efficiency, resulting in richer sampling results. The dripping component allows for immersion of the leaf roots in nutrient solution after cutting, delaying cell death time, maintaining the adsorption state of particulate matter, and avoiding dehydration distortion.

Description

Technical Field

[0001] This invention relates to the field of air particulate matter sampling technology, and in particular to a sampling device for monitoring air particulate matter trapped in forests. Background Technology

[0002] Forests trap airborne particulate matter primarily through mechanisms such as physical interception, adsorption, sedimentation on leaf surfaces, and stomatal absorption. Forests are natural air filters, effectively trapping various airborne particulate matter, especially PM10 and larger PM2.5.

[0003] Different regions have different climates, and the influence of airflow varies in a specific area under a particular terrain and location. When constructing windbreaks in a specific area, it is necessary to consider the conditions under which the forest can best trap airborne particulate matter. However, current methods mostly involve manual sampling at regular intervals in the forest, which is inefficient and difficult. Especially during rainy weather, the absorption capacity of leaves is enhanced when they are wet, making it impossible to sample the airborne particulate matter trapped in the forest in a timely manner, resulting in inaccurate sampling results. Furthermore, current sampling methods for forest airborne particulate matter trapping often involve sampling at different heights, resulting in limited and insufficient data that cannot provide more detailed data support for the subsequent construction of windbreaks. Therefore, a sampling device for monitoring forest airborne particulate matter trapping is proposed. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art by proposing a sampling device for monitoring airborne particulate matter trapped in forests.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A sampling device for monitoring airborne particulate matter trapped in forests includes a sampling platform and a mobile platform. The sampling platform has an installation slot and multiple storage slots at its top. The inner end face of the installation slot is connected to two multi-angle robotic arms for limiting branches and sampling, respectively, via an adjustment component. The inner side wall of the storage slot is connected to an insulated shell. One end of the inner side wall of the insulated shell is connected to a rotary motor. The output end of the rotary motor is connected to a sample storage cylinder via a drive shaft. The end of the sample storage cylinder is connected to a leaf-limiting frame via a flat-mouthed bucket. The leaf-limiting frame is connected to a sampling ring via upper and lower leaf-limiting components. The inner side wall of the sampling ring is connected to two opposing storage semicircular plates. The inner side wall of the storage semicircular plates is connected to a sampling blade via a storage telescopic rod. The upper storage semicircular plate is connected to a dripping component via a hose. The dripping component is connected to a nutrient solution storage tank.

[0007] The sampling platform is connected to a sampling box at one end via two hydraulic lifting rods. A limiting frame is provided below the sampling box, and multiple alignment components are provided within the limiting frame.

[0008] Preferably, the adjustment assembly consists of a sampling lifting column and a sampling push rod. The sampling lifting column is fixedly installed in the mounting slot on the sampling platform. The lifting end of the sampling lifting column is fixedly connected to the sampling push rod. The output end of the sampling push rod is fixedly connected to two multi-angle robotic arms via an adapter plate. One side of the multi-angle robotic arm is fixedly connected to a gripper for limiting branches. The other side of the multi-angle robotic arm is rotatably connected to a matching male disk. The insulation shell is fixedly connected to a matching female disk adapted to the matching male disk. Obstacle avoidance radars are fixedly connected to multiple side walls of the sampling platform. A high-definition camera is connected to the multi-angle robotic arm.

[0009] Preferably, the rotary motor is used to drive the sample storage cylinder to rotate on the inner wall of the heat insulation shell, the sampling ring is rotatably connected to the heat insulation shell, and the nutrient solution storage tank is assembled and connected to the heat insulation shell.

[0010] Preferably, the leaf limiting assembly includes a leaf limiting plate and two hydraulic push rods. The inner sidewall of the sampling ring is fixedly connected to the leaf limiting plate through the hydraulic push rods. A soft rubber strip is fixedly connected to the end of the leaf limiting plate. The upper and lower sidewalls of the leaf limiting frame are provided with grooves for limiting the sliding of the leaf limiting plate.

[0011] Preferably, the inner wall of the sampling ring is fixedly connected to two opposing fixing plates, and the fixing plates are fixedly connected to the receiving semi-circular plate through two cutting telescopic rods. An electromagnetic ring is fixedly connected to the fixed end of the cutting telescopic rod, and a permanent magnet ring is fixedly connected to the piston rod end of the cutting telescopic rod.

[0012] Preferably, the dripping assembly includes a titration control valve and a dripping cylinder. A piercing cone is fixedly connected to the top of the dripping cylinder. Multiple notches are provided at the top of the dripping cylinder. External threads are provided on the outer side wall of the top of the dripping cylinder. A threaded hole for threaded connection of the dripping cylinder is provided at the bottom of the nutrient solution storage tank. An aluminum foil film is provided on the inner side wall of the threaded hole.

[0013] Preferably, the upper receiving semicircular plate has a nourishing groove on its bottom end located on one side of the leaf limiting frame, and the nourishing groove is connected to the hose through a flow hole on the receiving semicircular plate.

[0014] Preferably, an air pump is fixedly connected to the top of the sampling box, the output end of the air pump is connected to the internal cavity of the sampling box, a filter cover is connected to the side wall of the sampling box, an suction hood is connected to the internal cavity of the sampling box, a sampling frame is fixedly connected to the inner side wall of the limiting frame, a transverse guide groove is opened on the inner side wall of the sampling frame, a longitudinal guide rail is connected to the inner side wall of the transverse guide groove, and a rotary cutting mechanism is connected to the inner side wall of the longitudinal guide rail through an electric push rod.

[0015] Preferably, the alignment assembly includes an alignment gear and an alignment wheel. The bottom of the sampling box is fixedly connected to the limiting frame via a fixed frame. The bottom of the fixed frame is connected to the alignment frame via four electrically controlled push rods. The alignment frame is rotatably connected to the alignment gear and the alignment wheel via pins. Multiple adjusting racks that mesh with the alignment gear are fixedly connected to the inner side wall of the limiting frame. Multiple limiting rods are fixedly connected to the outer side wall of the limiting frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. By adjusting the components and sample collection tubes, this scheme can achieve full spatial coverage of the forest canopy to the ground layer using three rows of sample collection tubes (high, middle and low), revealing the vertical distribution pattern of particulate matter deposition. Each row of 7 sample collection tubes covers 7 tilt angles from 0° to 90° upward, horizontal and downward, quantifying the influence of leaf angle on dust retention efficiency, making the sampling results more comprehensive.

[0018] 2. This method, through the setting of the drip component, allows the roots of the cut leaves to be immersed in nutrient solution (quantitatively supplied by the titration control valve), which delays cell death time, maintains the adsorption state of particulate matter, avoids dehydration distortion, and ensures the originality of subsequent laboratory analysis.

[0019] 3. This solution, through the setting of the leaf limiting component, can use a hydraulic push rod to drive the soft rubber strip to fix the blade, avoiding mechanical contact that could cause surface particles to fall off, thus ensuring the integrity of the blade sample.

[0020] 4. This solution, through the setting of the straightening component, can use the linkage mechanism of the straightening gear and the adjusting rack to straighten the fallen vegetation. The straightening wheel rotates to sort out the spatial distribution of vegetation, restore the true ground cover state, and avoid the deviation of surface particulate matter data caused by vegetation lodging that often occurs in traditional sampling. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a sampling device for monitoring airborne particulate matter trapped in forests, as proposed in this invention.

[0022] Figure 2 This is an assembly diagram of a sampling device for monitoring airborne particulate matter trapped in forests, as proposed in this invention.

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 This is a schematic diagram of the positions of two multi-angle robotic arms in a sampling device for monitoring airborne particulate matter trapped in forests, as proposed in this invention.

[0025] Figure 5 This is a schematic diagram of the connection between the paired male disk and the paired female disk in a sampling device for monitoring airborne particulate matter trapped in forests, as proposed in this invention.

[0026] Figure 6 This is a schematic diagram of the internal structure of the heat-insulating shell in a sampling device for monitoring airborne particulate matter trapped in forests, as proposed in this invention.

[0027] Figure 7 This is a schematic diagram of the internal structure of the sampling ring in a sampling device for monitoring airborne particulate matter trapped in forests, as proposed in this invention.

[0028] Figure 8 This is a schematic diagram of the leaf-limiting component in a sampling device for monitoring airborne particulate matter trapped in forests, as proposed in this invention.

[0029] Figure 9 for Figure 8 Enlarged view of point B in the middle;

[0030] Figure 10 This is a schematic diagram of the structure of the droplet assembly in a sampling device for monitoring airborne particulate matter trapped in forests, as proposed in this invention.

[0031] Figure 11 This is a schematic diagram of the structure of the sampling device for monitoring airborne particulate matter in forests, as proposed in this invention;

[0032] Figure 12 This is a schematic diagram of the alignment component in a sampling device for monitoring airborne particulate matter trapped in forests, as proposed in this invention.

[0033] Figure 13 for Figure 12 A magnified view of point C in the middle.

[0034] In the diagram: 1. Sampling platform; 2. Mobile platform; 3. Obstacle avoidance radar; 4. Sampling lifting column; 5. Sampling push rod; 6. Multi-angle robotic arm; 7. High-definition camera; 8. Paired male disk; 9. Paired female disk; 10. Insulated shell; 11. Corner motor; 12. Sample storage cylinder; 13. Flat-mouth bucket; 14. Leaf limiting frame; 15. Sampling ring; 16. Hydraulic push rod; 17. Leaf limiting plate; 18. Soft rubber strip; 19. Cutting telescopic rod; 20. Electromagnetic ring; 21. Permanent magnet ring; 22. Storage semi-circular plate; 23. Sampling blade; 24. Titration control valve; 25. Dropping cylinder; 26. Piercing cone; 27. Nutrient solution storage tank; 28. Hydraulic lifting rod; 29. ​​Air pump; 30. Sampling box; 31. Suction hood; 32. Electrically controlled push rod; 33. Alignment frame; 34. Alignment gear; 35. Alignment wheel; 36. Limiting frame; 37. Limiting rod; 38. Adjusting rack; 39. Sampling frame; 40. Longitudinal guide rail; 41. Electric push rod; 42. Rotary cutting mechanism. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Example, refer to Figures 1 to 13A sampling device for monitoring airborne particulate matter trapped in forests includes a sampling platform 1 and a mobile platform 2. The top of the sampling platform 1 is provided with an installation slot and multiple storage slots. The inner end face of the installation slot is connected to two multi-angle robotic arms 6, which are used for limiting branches and sampling, respectively, through an adjustment component. The inner side wall of the storage slot is connected to an insulation shell 10. One end of the insulation shell 10 is connected to an angle motor 11. The output end of the angle motor 11 is connected to a sample storage cylinder 12 through a drive shaft. The end of the sample storage cylinder 12 is connected to a leaf limiting frame 14 through a flat spout 13. The leaf limiting frame 14 is connected to a sampling ring 15 through two upper and lower leaf limiting components. The inner side wall of the sampling ring 15 is connected to two opposing storage semicircular plates 22. The inner side wall of the storage semicircular plates 22 is connected to a sampling blade 23 through a storage telescopic rod.

[0039] Furthermore, the adjustment assembly consists of a sampling lifting column 4 and a sampling push rod 5. The sampling lifting column 4 is fixedly installed in the mounting slot on the sampling platform 1. The lifting end of the sampling lifting column 4 is fixedly connected to the sampling push rod 5. The output end of the sampling push rod 5 is fixedly connected to two multi-angle robotic arms 6 via an adapter plate. One multi-angle robotic arm 6 is fixedly connected to a gripper for limiting branches, and the other multi-angle robotic arm 6 is rotatably connected to a matching male disk 8. The insulation shell 10 is fixedly connected to a matching female disk 9 that is compatible with the matching male disk 8. Obstacle avoidance radars 3 are fixedly connected to multiple side walls of the sampling platform 1. A high-definition camera 7 is connected to the multi-angle robotic arm 6. The corner motor 11 is used to drive the sample storage cylinder 12 in the insulation shell. The sampling ring 15 rotates on the inner wall of the 10 and is rotatably connected to the heat insulation shell 10. The nutrient solution storage tank 27 is assembled and connected to the heat insulation shell 10. The leaf limiting assembly includes a leaf limiting plate 17 and two hydraulic push rods 16. The inner wall of the sampling ring 15 is fixedly connected to the leaf limiting plate 17 through the hydraulic push rods 16. A soft rubber strip 18 is fixedly connected to the end of the leaf limiting plate 17. The upper and lower side walls of the leaf limiting frame 14 are provided with sliding grooves for limiting the sliding of the leaf limiting plate 17. Two opposing fixed plates are fixedly connected to the inner wall of the sampling ring 15. The fixed plates are fixedly connected to the storage semi-circular plate 22 through two cutting telescopic rods 19. An electromagnetic ring 20 is fixedly connected to the fixed end of the cutting telescopic rod 19. A permanent magnet ring 21 is fixedly connected to the piston rod end of the cutting telescopic rod 19.

[0040] It should be noted that: the mobile platform 2 is equipped with four wheels at the bottom for driving in the forest; the obstacle avoidance radar 3 helps the mobile platform 2 avoid obstacles such as trees during driving; the high-definition camera 7 is used to identify the tilt angle of the leaves to be sampled before sampling. These are all existing technical means and will not be repeated in the following description. Multiple heat-insulating shells 10 and sample storage tubes 12 are arranged in three rows for sampling leaves at high, medium and low positions, respectively. The number of sample storage tubes 12 in each row is set to seven, which are used for sampling and storing leaves with upward tilt angles of 0° to 30°, 30° to 60° and 60° to 90°, horizontal tilt angles, and downward tilt angles of 0° to 30°, 30° to 60° and 60° to 90°, respectively.

[0041] After the male disk 8 is mated with the female disk 9 on the insulation shell 10, the male disk 8 is controlled to rotate at a small angle and then lock into the magnetic limit position (see appendix for details). Figure 6 The sampling control at different heights is achieved by using the sampling lifting column 4, and the pushing position is controlled by the sampling push rod 5 according to the blade position.

[0042] During sampling, based on the high-definition camera 7's recognition of the leaf tilt angle, a leaf with a suitable tilt angle is selected. The starting angle motor 11 is controlled to drive the sample storage cylinder 12 and sampling ring 15 to rotate, rotating the leaf limiting frame 14 to an tilt angle close to that of the leaf to be sampled. The gripper on the multi-angle robotic arm 6 clamps the branch of the leaf to be sampled to prevent shaking from affecting the sampling. Then, the sample storage cylinder 12 is pushed forward, allowing the leaf to be sampled to pass through the leaf limiting frame 14 and enter the sample storage cylinder 12. After the leaf is fully inside, the hydraulic push rod 16 is synchronously activated to... The two leaf limiting plates 17 are pushed closer to each other, so that the two soft rubber strips 18 are pressed at the root of the blade, avoiding the blade from contacting the inner wall of the sample storage cylinder 12 and affecting the sampling results. Then the power supply to the electromagnetic ring 20 is disconnected. Under the elastic force of the cutting telescopic rod 19, the two sampling blades 23 cut the root of the blade. The two sampling blades 23 are squeezed into the storage semicircular plate 22. After the two storage semicircular plates 22 come into contact and stick together, the nourishing groove at the bottom of the upper storage semicircular plate 22 is in a near-sealed state.

[0043] The advantages mentioned above are as follows: the sample storage tube 12 can be rotated inside the heat insulation shell 10 to allow for individual sampling of leaves with different inclination angles. This facilitates the investigation of which inclination angle of leaves is more likely to collect sedimented particulate matter in this regional environment, resulting in richer sampling data of airborne particulate matter trapped in forests. This provides more detailed research data for selecting which tree species / genus to use in the subsequent construction of protective forests.

[0044] The upper storage semi-circular plate 22 is connected to a drip assembly via a hose, and the drip assembly is connected to a nutrient solution storage tank 27.

[0045] Furthermore, the dripping assembly includes a titration control valve 24 and a dripping cylinder 25. A piercing cone 26 is fixedly connected to the top of the dripping cylinder 25. Multiple notches are opened at the top of the dripping cylinder 25. External threads are opened on the outer side wall of the top of the dripping cylinder 25. A threaded hole for threaded connection of the dripping cylinder 25 is opened at the bottom of the nutrient solution storage tank 27. An aluminum foil film is provided on the inner side wall of the threaded hole. A nourishing tank is opened on the bottom of the upper receiving semicircular plate 22 located on one side of the leaf limiting frame 14. The nourishing tank is connected to the hose through the flow hole opened on the receiving semicircular plate 22.

[0046] It should be noted that: after the sampled leaf is cut, the root will be placed in the nutrient tank at the bottom of the upper semi-circular plate 22. Then, the titration control valve 24 is opened, and the nutrient solution in the nutrient solution storage tank 27 will enter the hose through the drip cylinder 25, and then flow into the nutrient tank through the hose to nourish the root of the leaf. After all the sample cylinders 12 have finished sampling, the sampled leaves are taken out one by one. After the nutrient solution in the nutrient solution storage tank 27 is used up, the threaded hole at the bottom of the new nutrient solution storage tank 27 is screwed tightly to the thread of the drip cylinder 25. During this process, the piercing cone 26 will pierce the aluminum foil film in the threaded hole, so that the notch at the top of the drip cylinder 25 is immersed in the nutrient solution, which facilitates the continuous delivery of nutrient solution.

[0047] The advantages mentioned above are as follows: the nutrient solution in the nutrient solution storage tank 27 can be dripped into the nourishing tank inside the semi-circular plate 22 using the dripping component, which facilitates continuous nourishment of the roots after leaf cutting, avoids dehydration and distortion of the leaves in a short time after cutting, and ensures the reliability of the sampling results.

[0048] One end of the sampling platform 1 is connected to the sampling box 30 via two hydraulic lifting rods 28. A limiting frame 36 is set below the sampling box 30, and multiple alignment components are set inside the limiting frame 36.

[0049] Furthermore, an air pump 29 is fixedly connected to the top of the sampling box 30, and the output end of the air pump 29 communicates with the internal cavity of the sampling box 30. A filter cover is connected to the side wall of the sampling box 30, and an suction hood 31 communicates with the internal cavity of the sampling box 30. A sampling frame 39 is fixedly connected to the inner wall of the limiting frame 36. A transverse guide groove is provided on the inner wall of the sampling frame 39, and a longitudinal guide rail 40 is connected to the inner wall of the transverse guide groove. A rotary cutting mechanism is connected to the inner wall of the longitudinal guide rail 40 through an electric push rod 41. 42. The alignment assembly includes an alignment gear 34 and an alignment wheel 35. The bottom of the sampling box 30 is fixedly connected to the limiting frame 36 through a fixed frame. The bottom of the fixed frame is connected to the alignment frame 33 through four electrically controlled push rods 32. The alignment frame 33 is rotatably connected to the alignment gear 34 and the alignment wheel 35 through pins respectively. Multiple adjusting racks 38 that mesh with the alignment gear 34 are fixedly connected to the inner side wall of the limiting frame 36. Multiple limiting rods 37 are fixedly connected to the outer side wall of the limiting frame 36.

[0050] It should be noted that: when the hydraulic lifting rod 28 is activated, the sampling box 30 is pushed downward, so that multiple limiting rods 37 are inserted into the vegetation ground to be sampled, thereby achieving the limiting and positioning of the sampling device. At this time, there will be a certain height difference between the limiting frame 36 and the ground. Then, multiple electrically controlled push rods 32 at the bottom of the fixed frame are activated simultaneously to slowly push the alignment frame 33 downward. The downward movement of the alignment frame 33 will drive multiple alignment gears 34 on its outer wall to move downward synchronously. When the alignment gears 34 move downward, they will contact and mesh with the adjusting rack 38. As the alignment gears 34 continue to move on the teeth of the adjusting rack 38, they will rotate. The rotation of the alignment gears 34 will drive the alignment wheel 35 to rotate through the pin shaft. The slow rotation of the alignment wheel 35 will move the plants at the edge of the sampling area, so that the tilted or fallen plants will stand up along the position of their roots towards the inside or outside of the alignment frame 33 under the movement of the alignment wheel 35.

[0051] The advantages mentioned above are as follows: the downward movement of the aligning gear 34 can drive the aligning wheel 35 to rotate, thereby moving the plants that are tilted or fallen at the edge of the sampling area upward. This separates the plants at the edge of the sampling area from the inside and outside by their root system, ensuring the accuracy of the sampling data and increasing the sampling data of airborne particulate matter trapped on the forest ground, making the sampling results more accurate.

[0052] In use, the sampling device is placed in the forest area where monitoring and sampling are required. When sampling is needed, the mobile platform 2 can be driven to move within a small range within the sampling area. Before sampling, the multi-angle robotic arm 6 with the paired male disk 8 is controlled to dock the paired male disk 8 with the paired female disk 9 on the insulation shell 10. Then, the paired male disk 8 is controlled to rotate at a small angle and lock into a magnetic limit position (see appendix for details). Figure 6 Then, the multi-angle robotic arm 6 takes the heat insulation shell 10 out of the storage slot. After the heat insulation shell 10 is moved to a high position, the control elements inside the heat insulation shell 10 and the control elements on the mobile platform 2 are paired via Bluetooth to generate control feedback signal links. This is an existing technical means and will not be elaborated on here. The sampling lifting column 4 is used to control the sampling at different heights, and the sampling push rod 5 is used to control the advancing position according to the blade position.

[0053] When sampling leaves from trees, the high-definition camera 7 identifies the leaf tilt angle and selects leaves with appropriate tilt angles (the insulation shell 10 being gripped is in its specific storage slot, and leaves within a specific tilt angle range need to be sampled for subsequent sampling results). Then, the electromagnetic ring 20 on the cutting telescopic rod 19 is energized, causing it to generate a magnetic attraction force on the permanent magnet ring 21, thus separating and opening the two storage semicircular plates 22. Next, the starting angle motor 11 is controlled to rotate the sample storage cylinder 12 and the sampling ring 15, rotating the leaf limiting frame 14 to an angle close to the leaf to be sampled. The gripper on the multi-angle robotic arm 6 clamps the branch of the leaf to be sampled to prevent shaking from affecting the sampling. Then, the sample storage cylinder 12 is advanced, allowing the leaf to pass through the leaf limiting frame 14 and enter the sample storage cylinder 12. After the leaf is fully inside, the hydraulic push rod 16 is synchronously activated to move the two... The leaf limiting plates 17 are pushed closer together, causing the two soft rubber strips 18 to press against the root of the leaf, preventing the leaf from contacting the inner wall of the sample storage cylinder 12 and affecting the sampling results. Then, the power to the electromagnetic ring 20 is disconnected. Under the elastic force of the cutting telescopic rod 19, the two sampling blades 23 cut the root of the leaf and squeeze into the receiving semicircular plate 22. After the two receiving semicircular plates 22 come into contact and stick together, the nourishing groove at the bottom of the upper receiving semicircular plate 22 is in a near-sealed state. In this way, the sample storage cylinder 12 can be rotated inside the heat insulation shell 10 to achieve individual sampling of leaves with different inclination angles. This makes it easier to explore which inclination angle of the leaf is more likely to catch the sedimented particulate matter in this regional environment, making the sampling data of forest airborne particulate matter more abundant and providing more detailed research data for the selection of tree species / genus for subsequent construction of protective forests.

[0054] After sampling, the cut roots of the sampled leaves are placed in the nutrient tank at the bottom of the upper semi-circular plate 22. Then, the titration control valve 24 is opened, and the nutrient solution in the nutrient solution storage tank 27 enters the tubing through the drip cylinder 25, and then flows into the nutrient tank to nourish the roots of the leaves. The heat preservation shell 10 keeps the sampled leaves in a suitable temperature environment to prevent rapid dehydration. After all the sample cylinders 12 have been used up, the sampled leaves are taken out one by one. After the nutrient solution in the nutrient solution storage tank 27 is used up, a new nutrient solution is added. The threaded hole at the bottom of the nutrient solution storage tank 27 is screwed tightly into the thread of the dripping cylinder 25. During this process, the piercing cone 26 will pierce the aluminum foil film inside the threaded hole, allowing the notch at the top of the dripping cylinder 25 to be immersed in the nutrient solution, which facilitates the continuous delivery of the nutrient solution. This makes the preparation work before sampling and the sampling process more convenient. In this way, the nutrient solution in the nutrient solution storage tank 27 can be dripped into the nourishing tank in the storage semi-circular plate 22 using the dripping component, which facilitates continuous nourishment of the roots after leaf cutting, avoids dehydration and distortion of the leaves in a short time after cutting, and ensures the reliability of the sampling results.

[0055] When sampling airborne particulate matter from ground vegetation, the hydraulic lifting rod 28 is activated to push the sampling box 30 downwards, causing multiple limiting rods 37 to be inserted into the vegetation to be sampled, thus limiting and positioning the sampling device. At this time, there will be a certain height difference between the limiting frame 36 and the ground. Subsequently, multiple electrically controlled push rods 32 at the bottom of the fixed frame are activated simultaneously to slowly push the alignment frame 33 downwards. The downward movement of the alignment frame 33 will drive multiple alignment gears 34 on its outer wall to move downwards simultaneously. When the alignment gears 34 move downwards, they will contact and mesh with the adjusting rack 38. As the alignment gears 34 continue to move on the teeth of the adjusting rack 38, they will rotate. The rotation of the alignment gears 34 will drive the alignment wheel 35 to rotate through the pin shaft. The slow rotation of the alignment wheel 35 will move the plants at the edge of the sampling area, causing tilted or fallen plants to be moved by the alignment wheel 35. Under the influence of the 5th push, the plant stands up along the position of its root system towards the inside or outside of the straightening frame 33. If the direction of the plant's fall is exactly the same as the rotation direction of the straightening wheel 35, the plant in this state will be pressed down by the frame of the straightening frame 33, which will not affect the subsequent sampling. Then, the electric push rod 41 is activated to push the rotary cutting mechanism 42 to the ground, and the rotary cutting mechanism 42 is activated to cut the plant. The electric push rod 41 is controlled to slide slowly in the longitudinal guide rail 40 to achieve slow and continuous cutting of the plant by the rotary cutting mechanism 42. After the longitudinal cutting is completed, the longitudinal guide rail 40 is controlled to slide a certain distance in the sampling frame 39 and stop, so that the rotary cutting mechanism 42 can perform reciprocating motion to cut adjacent plants. After the cutting is completed, the air pump 29 is activated to generate suction airflow from the suction hood 31 to the bottom, and the cut plant will be sucked into the sampling box 30 for preservation.

[0056] During the overall sampling of airborne particulate matter from ground vegetation, the filter screen on the sampling chamber 30 ensures normal airflow from bottom to top without affecting the sampling of airborne particulate matter. The airflow carries the sample into the sampling chamber 30 from bottom to top, and then the airflow exits through the filter screen, leaving the sample inside the sampling chamber 30. Simultaneously, the sampling of airborne particulate matter from ground vegetation, including both the sampled plants and ground dust particles, is to ensure the completeness of the overall sampling data and supplement the bottom-up sampling data of the forest. Forest ground dust particles, in particular, have significant reference value as test data for forest-retained airborne particulate matter. Particulate matter retained by the forest ultimately reaches the ground surface through dry deposition (gravity) or wet deposition (rainwater washout). Ground dust is the final sedimentary reservoir in this retention process, and research has confirmed that the PM2.5 concentration in ground dust can reflect 40-60% of the canopy's retention capacity (this was published in *Environmental Science* by Zhang Jinglin's team in 2021). According to the research in "&Technology", the collection of ground dust particles is also part of the sampling data during the sampling process;

[0057] This allows the downward movement of the centering gear 34 to drive the centering wheel 35 to rotate, thereby moving the tilted or fallen plants at the edge of the sampling area upwards. This separates the plants at the edge of the sampling area from the outside by their root system, ensuring the accuracy of the sampling data and increasing the sampling data of airborne particulate matter trapped on the forest ground, making the sampling results more accurate.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sampling device for monitoring airborne particulate matter trapped in forests, comprising a sampling platform (1) and a mobile platform (2), characterized in that, The sampling platform (1) has an installation slot and multiple storage slots at its top. The inner end face of the installation slot is connected to two multi-angle robotic arms (6) for limiting branches and sampling, respectively, through an adjustment component. The inner side wall of the storage slot is connected to an insulation shell (10). One end of the insulation shell (10) is connected to a corner motor (11). The output end of the corner motor (11) is connected to a sample storage cylinder (12) through a drive shaft. The end of the sample storage cylinder (12) is connected to a limiting leaf frame (14) through a flat-mouth bucket (13). The limiting leaf frame (14) is connected to a sampling ring (15) through two upper and lower limiting leaf components. The inner side wall of the sampling ring (15) is connected to two opposing storage semicircular plates (22). The inner side wall of the storage semicircular plate (22) is connected to a sampling blade (23) through a storage telescopic rod. The upper storage semicircular plate (22) is connected to a dripping component through a hose. The dripping component is connected to a nutrient solution storage tank (27). The sampling platform (1) is connected to a sampling box (30) at one end via two hydraulic lifting rods (28). A limiting frame (36) is provided below the sampling box (30), and multiple alignment components are provided inside the limiting frame (36). The adjustment assembly consists of a sampling lifting column (4) and a sampling push rod (5). The sampling platform (1) is fixedly installed with the sampling lifting column (4) in the mounting slot. The lifting end of the sampling lifting column (4) is fixedly connected to the sampling push rod (5). The output end of the sampling push rod (5) is fixedly connected to two multi-angle robotic arms (6) through an adapter plate. One side of the multi-angle robotic arm (6) is fixedly connected with a gripper for limiting branches. The other side of the multi-angle robotic arm (6) is rotatably connected with a matching male disk (8). The heat insulation shell (10) is fixedly connected with a matching female disk (9) that is compatible with the matching male disk (8). Obstacle avoidance radar (3) is fixedly connected to the multi-sided sidewalls of the sampling platform (1). A high-definition camera (7) is connected to the multi-angle robotic arm (6).

2. A sampling device for monitoring airborne particulate matter trapped in forests according to claim 1, characterized in that, The rotary motor (11) is used to drive the sample storage cylinder (12) to rotate on the inner wall of the heat insulation shell (10). The sampling ring (15) is rotatably connected to the heat insulation shell (10). The nutrient solution storage tank (27) is assembled and connected to the heat insulation shell (10).

3. A sampling device for monitoring airborne particulate matter trapped in forests according to claim 1, characterized in that, The leaf limiting assembly includes a leaf limiting plate (17) and two hydraulic push rods (16). The inner wall of the sampling ring (15) is fixedly connected to the leaf limiting plate (17) through the hydraulic push rods (16). A soft rubber strip (18) is fixedly connected to the end of the leaf limiting plate (17). The upper and lower side walls of the leaf limiting frame (14) are provided with grooves for limiting the sliding of the leaf limiting plate (17).

4. A sampling device for monitoring airborne particulate matter trapped in forests according to claim 1, characterized in that, The inner wall of the sampling ring (15) is fixedly connected to two opposing fixing plates. The fixing plates are fixedly connected to the storage semicircular plate (22) through two cutting telescopic rods (19). An electromagnetic ring (20) is fixedly connected to the fixed end of the cutting telescopic rod (19), and a permanent magnet ring (21) is fixedly connected to the piston rod end of the cutting telescopic rod (19).

5. A sampling device for monitoring airborne particulate matter trapped in forests according to claim 1, characterized in that, The dripping assembly includes a titration control valve (24) and a dripping cylinder (25). A piercing cone (26) is fixedly connected to the top of the dripping cylinder (25). Multiple notches are provided at the top of the dripping cylinder (25). External threads are provided on the outer side wall of the top of the dripping cylinder (25). A threaded hole for threaded connection of the dripping cylinder (25) is provided at the bottom of the nutrient solution storage tank (27). An aluminum foil film is provided on the inner side wall of the threaded hole.

6. A sampling device for monitoring airborne particulate matter trapped in forests according to claim 5, characterized in that, The upper storage semicircular plate (22) has a nourishing groove on its bottom end located on one side of the leaf limiting frame (14). The nourishing groove is connected to the hose through a flow hole on the storage semicircular plate (22).

7. A sampling device for monitoring airborne particulate matter trapped in forests according to claim 1, characterized in that, An air pump (29) is fixedly connected to the top of the sampling box (30). The output end of the air pump (29) is connected to the internal cavity of the sampling box (30). A filter cover is connected to the side wall of the sampling box (30). An suction hood (31) is connected to the internal cavity of the sampling box (30). A sampling frame (39) is fixedly connected to the inner wall of the limiting frame (36). A transverse guide groove is opened on the inner wall of the sampling frame (39). A longitudinal guide rail (40) is connected to the inner wall of the transverse guide groove. A rotary cutting mechanism (42) is connected to the inner wall of the longitudinal guide rail (40) through an electric push rod (41).

8. A sampling device for monitoring airborne particulate matter trapped in forests according to claim 1, characterized in that, The alignment assembly includes an alignment gear (34) and an alignment wheel (35). The bottom of the sampling box (30) is fixedly connected to the limiting frame (36) via a fixed frame. The bottom of the fixed frame is connected to the alignment frame (33) via four electrically controlled push rods (32). The alignment frame (33) is rotatably connected to the alignment gear (34) and the alignment wheel (35) via pins. Multiple adjusting racks (38) that mesh with the alignment gear (34) are fixedly connected to the inner side wall of the limiting frame (36). Multiple limiting rods (37) are fixedly connected to the outer side wall of the limiting frame (36).

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