A sample collection device for forest carbon sink detection

Abstract

The present invention discloses a sample collection device for forest carbon sink detection, and the present invention relates to the technical field of forest carbon sink detection. By setting up a gas sample collection mechanism, it can use a plurality of gas collection components arranged in a circular array to sample air at different time periods respectively, so as to detect the carbon dioxide content in the air at different time periods; secondly, each gas collection component can realize dynamic monitoring of the air during the continuous flow of air, and can also randomly intercept a part of the air passing through the air collection cylinder through the mutual cooperation of the first circular cylinder, the second circular cylinder, the airbag air pipe and the driving component, so as to achieve the effect of randomly quantitatively collecting air samples, thereby increasing the sample capacity, and at the same time, it can detect the fixed amount of air samples after collecting the samples. By detecting a large number of samples, the influence of accidental errors on the detection results can be avoided, and the credibility of the sample detection results can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of forest carbon sink detection, and specifically to a sample collection device for forest carbon sink detection. Background Art

[0002] Forest carbon sink refers to the process by which forest plants absorb carbon dioxide from the atmosphere through photosynthesis and fix it in vegetation or soil, thereby reducing the concentration of this gas in the atmosphere. This is the unique role of forests in mitigating climate change and addressing global warming.

[0003] For a distributed forest carbon sink detection collection device disclosed in a patent application with a reference publication number of CN213397851U, before collecting air, the insect repellent lamp body and the heating tube can be turned on. The heating tube evaporates the insect repellent liquid, thereby achieving the purpose of repelling and killing insects. Then, the fan is turned on to prevent small flying insects in the forest from entering the detection box body when sucking air into the detection box body, preventing damage to the detection box body and affecting the normal use of the device; it is provided with a rain shield to prevent rainwater from entering the liquid medicine box. At the same time, the inclination angle of the rain shield can be manually adjusted, and the operation is simple and can be completed with one hand.

[0004] When the existing forest carbon sink detection collection device collects air samples, due to the long-term continuous filtration operation of its internal air filtration device, a large amount of dust and other impurities are easily adhered to its surface, resulting in difficult smooth entry of external air into the detection device, thereby reducing the collection speed of air samples. Cleaning the filtration device during the collection process will interrupt the sample collection process and prevent sample collection within a continuous time period, thus easily causing the lack of air samples in some time periods in the collected air samples, affecting the final sample analysis results; secondly, since it can only collect and detect air in a flowing state and cannot collect air samples of a fixed volume, it is difficult to determine the carbon dioxide content in different volumes of air, and the final detection result cannot be quantified, reducing the accuracy and reliability of the detection result; for example, a distributed forest carbon sink detection collection device with a publication number of CN213397851U only sucks air into the detection box body to complete the detection of air in a flowing state, and cannot obtain air samples of a fixed volume, thus making it difficult to determine the carbon dioxide content in a fixed volume. Secondly, impurities, particulate matter, or small flying insects in the air will adhere to the dust-proof layer, causing blockage of the filtration holes and resulting in poor air circulation. If the dust-proof layer is cleaned, air collection needs to be suspended, resulting in the inability to obtain air samples within a continuous time period.

[0005] Therefore, the present invention proposes a sample collection device for forest carbon sink detection to solve the above problems. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a sample collection device for forest carbon sink detection, which solves the problems that after the air filtration device in the existing sample collection device has been continuously filtering for a long time, a large amount of dust and other impurities are easily adhered to its surface, making it difficult for external air to smoothly enter the interior of the detection device, thereby reducing the collection speed of air samples. During the collection process, cleaning the filtration device will interrupt the sample collection process, and air samples for some time periods will be missing from the collected air samples, affecting the final sample analysis results. Since only the flowing air can be collected and detected, it is impossible to collect air samples of a fixed volume, making it difficult to determine the carbon dioxide content in different volumes of air and unable to quantify the final detection results, reducing the accuracy and reliability of the detection results.

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A sample collection device for forest carbon sink detection, including a support frame, further including:

[0008] A box body, detachably arranged on the top of the support frame. A cover plate is rotatably arranged on the front of the box body through a hinge, and an air inlet for sample collection is provided on the front of the cover plate.

[0009] A gas sample collection mechanism, arranged inside the box body, used to collect air samples for forest carbon sink detection and adjust the collection amount of each air sample according to the sample collection requirements to increase the sample capacity.

[0010] A fan, arranged inside the air inlet, used to suck external air into the gas sample collection mechanism to complete the collection operation of air samples. A guide pipe for guiding the air flow is fixedly arranged on the gas output end of the fan.

[0011] A controller, fixedly arranged on the outer wall of the box body, used to control the operation of all electrical equipment.

[0012] Further, the gas sample collection mechanism includes:

[0013] Multiple gas collection components, distributed in a circular array, used to collect and store air for forest carbon sink detection and detect the carbon dioxide content of the collected air samples.

[0014] A position switching component, arranged inside the box body, used to switch the positions between multiple gas collection components to collect air samples for different time periods using multiple gas collection components.

[0015] A power component, arranged below the position switching component, used to drive the position switching component to rotate intermittently.

[0016] The air flow back-blowing assembly is connected to multiple gas collection assemblies simultaneously, and is used to recycle the air flowing out from the gas collection assemblies at the air sample collection positions back to other gas collection assemblies that are not at the air sample collection positions, so as to complete the purging and cleaning operation of the idle gas collection assemblies;

[0017] The sample collection volume adjustment assembly is arranged on one side of the position switching assembly, and is used to adjust the air collection capacity of multiple gas collection assemblies simultaneously, so as to complete the collection operation of air samples with various volumes;

[0018] The driving assembly is arranged on the side wall of the box body, and is used to drive the gas collection assembly to complete the interception operation of the air entering its interior.

[0019] Further, the position switching assembly includes:

[0020] The annular frame is fixedly arranged inside the box body through the mounting bracket, and is used to provide support for installing other components;

[0021] The disc is rotatably arranged inside the annular frame, and a plurality of through holes for installing the gas collection assemblies are evenly arranged on the outer wall of the disc;

[0022] The toothed ring is fixedly arranged on the side wall of the disc, and is used to drive the disc to rotate by the driving force of the power assembly.

[0023] Further, the power assembly includes:

[0024] The servo motor is fixedly arranged inside the cavity of the box body, and the servo motor automatically locks the output shaft every time it rotates a preset angle according to the preset program;

[0025] The gear is fixedly sleeved on the output shaft of the servo motor, and the gear is meshed and connected with the toothed ring.

[0026] Further, the sample collection volume adjustment assembly includes:

[0027] The first micro electric push rod is fixedly arranged on the outer wall of the box body, and the output shaft of the first micro electric push rod slides through the box body and extends into its interior;

[0028] The bearing plate is fixedly arranged on the output shaft of the first micro electric push rod, and is used to control the gas collection volume of the gas collection assemblies at multiple positions simultaneously. An annular groove for connecting with multiple gas collection assemblies simultaneously is arranged on the outer wall of the bearing plate;

[0029] The driving assembly includes a second micro electric push rod fixedly arranged on the inner wall of the box body through a bracket, and a thimble for cooperating with the gas collection assembly is also fixedly arranged on the output shaft of the second micro electric push rod.

[0030] Furthermore, the air flow back-blowing assembly includes:

[0031] An annular metal pipe, arranged between multiple gas collection assemblies, for collecting the air discharged from the gas collection assemblies;

[0032] Multiple connecting pipes, evenly and fixedly arranged on the outer wall of the annular metal pipe, each of the connecting pipes is respectively connected to one of the gas collection assemblies at the corresponding position, for introducing the air in the gas collection assembly at the air collection position into the gas collection assemblies at other positions;

[0033] Multiple back-blowing pipes, evenly and fixedly arranged on the outer wall of the annular metal pipe, each of the back-blowing pipes is respectively connected to one of the gas collection assemblies at the corresponding position, for respectively conveying the air in the annular metal pipe into the gas collection assemblies that are not in the air collection state.

[0034] Furthermore, the gas collection assembly includes an air filtration unit and a sample detection unit, and the air filtration unit includes:

[0035] A filter cartridge, arranged in the through hole, and a cavity is formed between the filter cartridge and the inner wall of the through hole, for providing space for air flow;

[0036] Two isolation rings, respectively and fixedly sleeved on both sides of the outer wall of the filter cartridge, and the two isolation rings respectively seal both ends of the cavity at the corresponding position;

[0037] A screw conveyor, rotatably arranged inside the filter cartridge, and brush hairs for cleaning the inner wall of the filter cartridge are evenly and fixedly arranged on the outer wall of the screw conveyor, and one end of the screw conveyor rotatably penetrates through the filter cartridge and is fixedly provided with an impeller;

[0038] Multiple air inlet holes are evenly opened on the outer wall of one of the isolation rings, and an air inlet pipe for conveying air to the sample detection unit is fixedly arranged at each position on the outer wall of the isolation ring corresponding to the multiple air inlet holes;

[0039] A cylinder body, fixedly arranged on the outer wall of one of the isolation rings and located outside the impeller, for collecting the refluxed air and conveying the air into the filter cartridge, and a reflux pipe is fixedly arranged at one end of the cylinder body;

[0040] Multiple gas flow control units are evenly arranged at one end of the filter cartridge, for conveying the air collected in the cylinder body into the filter cartridge.

[0041] Further, the gas flow direction control unit includes a plurality of gas return holes evenly formed at one end of the filter cylinder. A guide rod is fixedly arranged on the inner wall of each gas return hole through a mounting frame. A baffle is slidably sleeved on the outer wall of the guide rod and inside the filter cylinder. One end of the guide rod away from the gas return hole is also fixedly provided with a limit plate. A second spring is slidably sleeved on the outer wall of the guide rod between the limit plate and the baffle.

[0042] Further, the sample detection unit includes a gas collecting cylinder arranged on one side of the filter cylinder at a corresponding position. An air delivery pipe is fixedly arranged on the outside of the gas collecting cylinder. Both ends of the air delivery pipe penetrate through the gas collecting cylinder and extend to its inside. A thick pipe is hermetically slidably sleeved on the outer wall of one end of the air delivery pipe. A carbon dioxide content detector is also fixedly arranged on the outer wall of the gas collecting cylinder.

[0043] One end of the thick pipe and the air delivery pipe are respectively fixedly provided with a first circular cylinder and a second circular cylinder. Annular mounting grooves are formed on the outer walls of the first circular cylinder and the second circular cylinder. Annular air bags are fixedly arranged inside the annular mounting grooves. An air inlet assembly for inflating the inside thereof is also arranged on one side of the outer wall of the air delivery pipe. A push-pull rod is fixedly arranged on the outer surface of one of the first circular cylinders. A limit plate is fixedly arranged at one end of the push-pull rod.

[0044] Further, the air inlet assembly includes an air cylinder and a piston slidably arranged inside the air cylinder. A push rod is fixedly arranged at one end of the piston. One end of the push rod slidably penetrates through the air cylinder and is fixedly provided with a push plate. A first spring is slidably sleeved on the outer wall of the push rod between the air cylinder and the push plate.

[0045] The present invention provides a sample collection device for forest carbon sink detection. Compared with the prior art, the following beneficial effects are achieved:

[0046] 1. A sample collection device for forest carbon sink detection. By arranging a gas sample collection mechanism, it can use a plurality of gas collection components arranged in a circumferential array to sample air at different time periods respectively, so as to detect the carbon dioxide content in the air at different time periods. Secondly, each gas collection component can realize dynamic monitoring of the air during the continuous flow of air, and can also randomly intercept a part of the air passing through the gas collecting cylinder through the mutual cooperation of the first circular cylinder, the second circular cylinder, the air bag air delivery pipe and the driving component, so as to achieve the effect of randomly quantitatively collecting air samples, thereby increasing the sample capacity. At the same time, after collecting the samples, the fixed amount of air samples can be detected. By detecting a large number of samples, the influence of accidental errors on the detection results can be avoided, and the credibility of the sample detection results can be improved.

[0047] 2. A sample collection device for forest carbon sink detection. By using a first micro electric push rod to push the bearing plate, the positions of the limiting plates at multiple positions can be synchronously changed, and then the distance between the first circular plate and the second circular plate can be changed, so that the volume of the air collecting cylinder cavity between the first circular plate and the second circular plate forms different sizes. Therefore, when the airbag expands to block the gaps between the first circular plate, the second circular plate and the inner wall of the air collecting cylinder, the effect of intercepting part of the air sample in the air collecting cylinder can be achieved, and air samples with different volumes can be added to the sample library, increasing the richness of the air collection samples.

[0048] 3. A sample collection device for forest carbon sink detection. By setting an air filtration unit in the gas collection component, the air entering can be filtered when the gas collection component is in the working position of collecting air samples, ensuring that the air entering the air collecting cylinder is in a clean state. The air flowing out from this position can enter the annular metal tube through the connecting pipe, and is respectively input into other gas collection components at multiple positions that are not in the state of collecting air samples by the air flow backwashing component composed of the annular metal tube, multiple backwashing pipes and multiple connecting pipes. Thus, the wind power is used to drive the impeller to rotate at the corresponding position, and the impeller drives the auger to rotate. Therefore, the bristles on the outer wall of the auger can clean the inner wall of the filter cylinder, and the helically distributed bristles can push the dust swept off to the outside of the filter cylinder while cleaning the inner wall of the filter cylinder, achieving the effect of cleaning the gas collection component in the idle state. And by using the waste gas discharged during the detection process as the power to clean the filter cylinder, there is no need to separately set a power device for driving the auger, thus saving the cost of setting the power device.

[0049] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the first overall three-dimensional structure of the present invention;

[0051] Figure 2 It is a schematic diagram of the second overall three-dimensional structure of the present invention;

[0052] Figure 3 It is a schematic diagram of the first sectional structure of the present invention;

[0053] Figure 4 For the present invention Figure 3 The enlarged schematic diagram of part A in;

[0054] Figure 5For the present invention Figure 3 Schematic diagram of the enlarged structure of part B in the present invention;

[0055] Figure 6 Schematic diagram of the second sectional view structure of the present invention;

[0056] Figure 7 Schematic diagram of the third sectional view structure of the present invention;

[0057] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure of part C in the present invention;

[0058] Figure 9 Schematic diagram of the disassembled state structure of the present invention;

[0059] Figure 10 Schematic diagram of the first disassembled state structure of the box body and the cover plate of the present invention;

[0060] Figure 11 Schematic diagram of the second disassembled state structure of the box body and the cover plate of the present invention;

[0061] Figure 12 Schematic diagram of the sectional view structure of the gas sample collection mechanism of the present invention;

[0062] Figure 13 Schematic diagram of the assembled state structure of the annular frame and the disc of the present invention;

[0063] Figure 14 For the present invention Figure 12 Schematic diagram of the enlarged structure of part D in the present invention;

[0064] Figure 15 For the present invention Figure 12 Schematic diagram of the enlarged structure of part E in the present invention;

[0065] Figure 16 Schematic diagram of the first overall structure of the gas sample collection mechanism of the present invention;

[0066] Figure 17 For the present invention Figure 16 Schematic diagram of the enlarged structure of part F in the present invention;

[0067] Figure 18 Schematic diagram of the second overall structure of the gas sample collection mechanism of the present invention;

[0068] Figure 19 Schematic diagram of the first overall structure of the gas collection component of the present invention;

[0069] Figure 20 Schematic diagram of the sectional view structure of the air intake component of the present invention;

[0070] Figure 21 Schematic diagram of the second overall structure of the air intake component of the present invention;

[0071] Figure 22 It is a schematic diagram of the first sectional structure of the air intake assembly of the present invention;

[0072] Figure 23 It is a schematic diagram of the second sectional structure of the air intake assembly of the present invention;

[0073] Figure 24 It is a schematic diagram of the disassembled state structure of the air intake assembly of the present invention;

[0074] Figure 25 For the present invention Figure 24 A schematic enlarged structure diagram of part G in it.

[0075] In the figure: 1, support frame; 2, box body; 3, cover plate; 4, gas sample collection mechanism; 41, annular frame; 42, disc; 43, toothed ring; 44, through hole; 45, gas collection assembly; 451, filter cylinder; 452, isolation ring; 453, auger; 454, brush bristles; 455, air intake hole; 456, cylinder body; 457, impeller; 458, air collection cylinder; 459, intake pipe; 4510, return pipe; 4511, gas transmission pipe; 4512, thick pipe; 4513, carbon dioxide content detector; 4514, first circular cylinder; 4515, second circular cylinder; 4516, annular airbag; 4517, air intake assembly; a1, air cylinder; a2, piston; a3, push rod; a4, push plate; a5, first spring; 4518, push-pull rod; 4519, limiting plate; b1, gas return hole; b2, baffle; b3, guide rod; b4, second spring; 46, cavity; 47, first micro electric push rod; 48, bearing plate; 49, annular groove; 410, annular metal pipe; 411, connecting pipe; 412, backwashing pipe; 413, servo motor; 414, gear; 415, second micro electric push rod; 416, ejector pin; 5, fan; 6, air guide pipe. Specific embodiments

[0076] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0077] The present invention provides two technical solutions: a sample collection device for forest carbon sink detection, specifically including the following embodiments:

[0078] As Figures 1 - 11 Illustrated in the first implementation manner: a sample collection device for forest carbon sink detection, including a support frame 1, and further including:

[0079] The box body 2 is detachably arranged on the top of the support frame 1. A cover plate 3 is rotatably arranged on the front of the box body 2 through a hinge, and an air inlet for sample collection is opened on the front of the cover plate 3.

[0080] The gas sample collection mechanism 4 is arranged inside the box body 2, and is used for collecting air samples for forest carbon sink detection and adjusting the collection amount of each air sample according to the sample collection requirements to increase the sample capacity.

[0081] The fan 5 is arranged inside the air inlet, and is used for sucking external air into the gas sample collection mechanism 4 to complete the collection operation of the air sample. A guide pipe 6 for guiding the air flow is fixedly arranged on the gas output end of the fan 5; after each gas collection component 45 rotates a preset angle, one gas collection component 45 is aligned with the guide pipe 6, and the guide pipe 6 can be hermetically docked with the air inlet end of the filter cylinder 451 in the gas collection component 45 at the aligned position.

[0082] The controller is fixedly arranged on the outer wall of the box body 2 and is used for controlling the operation of all electrical equipment.

[0083] As Figures 12 - 25 The second embodiment is shown, and the difference from the first embodiment is that: a sample collection device for forest carbon sink detection, the gas sample collection mechanism 4 includes:

[0084] A plurality of gas collection components 45 are distributed in a circular array, and are used for collecting and storing air for forest carbon sink detection and detecting the carbon dioxide content of the collected air samples.

[0085] The position switching component is arranged inside the box body 2 and is used for switching the positions between a plurality of gas collection components 45 to collect air samples at different time periods by using the plurality of gas collection components 45.

[0086] The power component is arranged below the position switching component and is used for driving the position switching component to rotate intermittently.

[0087] The air flow back-blowing component is connected to a plurality of gas collection components 45 at the same time, and is used for re-flowing the air flowing out of the gas collection component 45 in the position of collecting air samples to other gas collection components 45 that are not in the position of collecting air samples to complete the purging and cleaning operation of the gas collection components 45 in the idle state.

[0088] The sample collection amount adjusting component is arranged on one side of the position switching component and is used for simultaneously adjusting the air collection capacity of a plurality of gas collection components 45 to complete the collection operation of air samples with various capacities.

[0089] The driving component is arranged on the side wall of the box body 2 and is used to drive the gas collection component 45 to complete the interception operation of the air entering its interior.

[0090] The position switching component includes:

[0091] The annular frame 41 is fixedly arranged inside the box body 2 through the mounting bracket and is used to provide support for mounting other components;

[0092] The disc 42 is rotatably arranged inside the annular frame 41, and a plurality of through holes 44 for mounting the gas collection component 45 are uniformly arranged on the outer wall of the disc 42;

[0093] The toothed ring 43 is fixedly arranged on the side wall of the disc 42 and is used to drive the disc 42 to rotate by the driving force of the power component.

[0094] The power component includes:

[0095] The servo motor 413 is fixedly arranged inside the cavity of the box body 2. The servo motor 413 automatically locks the output shaft every time it rotates a preset angle according to the preset program; after the servo motor 413 is started again, the lock on its output shaft will be automatically released;

[0096] The gear 414 is fixedly sleeved on the output shaft of the servo motor 413, and the gear 414 is meshed and connected with the toothed ring 43.

[0097] The sample collection volume adjustment component includes:

[0098] The first micro electric push rod 47 is fixedly arranged on the outer wall of the box body 2. The output shaft of the first micro electric push rod 47 slides through the box body 2 and extends into its interior;

[0099] The bearing plate 48 is fixedly arranged on the output shaft of the first micro electric push rod 47 and is used to control the gas collection volume of the gas collection component 45 at multiple positions at the same time. An annular groove 49 for connecting with a plurality of gas collection components 45 at the same time is arranged on the outer wall of the bearing plate 48;

[0100] The driving component includes a second micro electric push rod 415 fixedly arranged on the inner wall of the box body 2 through a bracket. A thimble 416 for cooperating with the gas collection component 45 is also fixedly arranged on the output shaft of the second micro electric push rod 415.

[0101] The air flow backwashing component includes:

[0102] The annular metal pipe 410 is arranged between a plurality of gas collection components 45 and is used to collect the air discharged from the gas collection component 45;

[0103] A plurality of connecting pipes 411 are uniformly and fixedly arranged on the outer wall of the annular metal pipe 410. Each connecting pipe 411 is respectively connected to one of the gas collection components 45 at the corresponding position, and is used to introduce the air in the gas collection component 45 at the air collection position into the gas collection component 45 at other positions;

[0104] A plurality of backflush pipes 412 are uniformly and fixedly arranged on the outer wall of the annular metal pipe 410. Each backflush pipe 412 is respectively connected to one of the gas collection components 45 at the corresponding position, and is used to respectively transport the air in the annular metal pipe 410 into the gas collection component 45 that is not in the air collection state.

[0105] The gas collection component 45 includes an air filtration unit and a sample detection unit. The air filtration unit includes:

[0106] A filter cylinder 451 is arranged in the through hole 44. A cavity 46 is formed between the filter cylinder 451 and the inner wall of the through hole 44, and is used to provide space for air flow;

[0107] Two isolation rings 452 are respectively fixedly sleeved on both sides of the outer wall of the filter cylinder 451. The two isolation rings 452 respectively block both ends of the cavity 46 at the corresponding position;

[0108] An auger 453 is rotatably arranged inside the filter cylinder 451. Brush hairs 454 for cleaning the inner wall of the filter cylinder 451 are uniformly and fixedly arranged on the outer wall of the auger 453. One end of the auger 453 rotatably penetrates through the filter cylinder 451 and is fixedly provided with an impeller 457;

[0109] A plurality of air inlet holes 455 are uniformly opened on the outer wall of one of the isolation rings 452. An air inlet pipe 459 for transporting air to the sample detection unit is fixedly arranged at the position corresponding to the plurality of air inlet holes 455 on the outer wall of the isolation ring 452;

[0110] A cylinder body 456 is fixedly arranged on the outer wall of one of the isolation rings 452 and is located outside the impeller 457. It is used to collect the refluxed air and transport the air into the filter cylinder 451. One end of the cylinder body 456 is fixedly provided with a reflux pipe 4510; One end of the reflux pipe 4510 is connected to the cylinder body 456 at the corresponding position, and the other end is fixedly connected to the backflush pipe 412 at the corresponding position. The plurality of connecting pipes 411 are communicated with the inside of the gas collecting cylinder 458 at the corresponding position;

[0111] A plurality of gas flow control units are uniformly arranged at one end of the filter cylinder 451 and are used to transport the air collected in the cylinder body 456 into the filter cylinder 451.

[0112] The gas flow control unit includes a plurality of gas return holes b1 evenly formed at one end of the filter cylinder 451. A guide rod b3 is fixedly arranged on the inner wall of each gas return hole b1 through a mounting bracket. A baffle b2 is slidably sleeved on the outer wall of the guide rod b3 and inside the filter cylinder 451. A limiting plate is fixedly arranged at one end of the guide rod b3 away from the gas return hole b1. A second spring b4 is slidably sleeved on the outer wall of the guide rod b3 between the limiting plate and the baffle b2. The outer diameter of the baffle b2 is larger than the inner diameter of the gas return hole b1. An annular sealing ring is fixedly arranged on the inner wall of the baffle b2 close to the filter cylinder 451. When the baffle b2 is in close contact with the inner wall of the filter cylinder 451, the gas return hole b1 can be completely sealed.

[0113] The sample detection unit includes a gas collection cylinder 458 arranged on one side of the filter cylinder 451 at a corresponding position. An air delivery pipe 4511 is fixedly arranged outside the gas collection cylinder 458. Both ends of the air delivery pipe 4511 penetrate through the gas collection cylinder 458 and extend into its interior. A thick pipe 4512 is slidably sleeved on the outer wall of one end of the air delivery pipe 4511 in a sealed manner. A carbon dioxide content detector 4513 is also fixedly arranged on the outer wall of the gas collection cylinder 458; both the air delivery pipe 4511 and the thick pipe 4512 are rigid steel pipes, which can stably support the first circular cylinder 4514 and the second circular cylinder 4515; the detection terminal of the carbon dioxide content detector 4513 penetrates through the gas collection cylinder 458 and extends into the interior for detecting the carbon dioxide content in the air;

[0114] One end of the thick pipe 4512 and the gas pipeline 4511 are respectively fixedly provided with a first circular cylinder 4514 and a second circular cylinder 4515. Annular installation grooves are provided on the outer walls of the first circular cylinder 4514 and the second circular cylinder 4515. An annular airbag 4516 is fixedly arranged inside the annular installation groove. And an air inlet assembly 4517 for inflating the inside thereof is arranged on one side of the outer wall of the gas pipeline 4511. A push-pull rod 4518 is fixedly arranged on the outer surface of one of the first circular cylinders 4514. One end of the push-pull rod 4518 is fixedly provided with a limit plate 4519. The limit plate 4519 is slidably arranged inside the annular groove 49; the moving range of the first circular cylinder 4514 is always located on one side of the carbon dioxide detection content detector 4513, that is, to ensure that the carbon dioxide detection content detector 4513 is always between the first circular cylinder 4514 and the second circular cylinder 4515; the structures of the first circular cylinder 4514 and the second circular cylinder 4515 are completely the same, and the outer diameter of the first circular cylinder 4514 is slightly smaller than the inner diameter of the air collecting cylinder 458. When the annular airbag 4516 is not inflated and expanded, air can freely pass through the air collecting cylinder 458. And after the annular airbag 4516 is inflated and expanded, the annular airbag 4516 can block the gap between the first circular cylinder 4514, the second circular cylinder 4515 and the air collecting cylinder 458, so that the cavity of the air collecting cylinder 458 located between the first circular cylinder 4514 and the second circular cylinder 4515 is in a closed state; air needles communicated with their interiors are fixedly arranged in the annular installation grooves of the first circular cylinder 4514 and the second circular cylinder 4515. The air needles are communicated with the annular airbag 4516 at the corresponding positions. After air enters the first circular cylinder 4514 and the second circular cylinder 4515 through the gas pipeline 4511, the air then enters the annular airbag 4516 through the air needles.

[0115] The air inlet assembly 4517 includes an air cylinder a1 and a piston a2 slidably arranged inside the air cylinder a1. One end of the piston a2 is fixedly provided with a push rod a3. One end of the push rod a3 slidably penetrates through the air cylinder a1 and is fixedly provided with a push plate a4. A first spring a5 is slidably sleeved on the outer wall of the push rod a3 and between the air cylinder a1 and the push plate a4; every time the servo motor 413 rotates once, that is, a push plate a4 and the ejector pin 416 are opposite. When the second micro electric push rod 415 pushes the ejector pin 416 close to the push plate a4, the push plate a4 can be pushed by the ejector pin 416; the air cylinder a1 is fixedly connected to the gas pipeline 4511 at the corresponding position, and their inner cavities are communicated, that is, the air discharged from the air cylinder a1 can enter the gas pipeline 4511.

[0116] During use, in the initial position state, the position of one of the gas collection components 45 is directly opposite to the air duct 6. That is, at this position, the intake port end of the filter cartridge 451 in the gas collection component 45 is in close contact with the air duct 6, achieving a sealed connection. The fan 5 sucks external air through the air duct 6 and enters it into the filter cartridge 451 at the corresponding position. The air enters the cavity 46 through the filter holes on the outer wall of the filter cartridge 451. The clean air enters the air collection cylinder 458 through the intake holes 455 and the intake pipe 459 at multiple positions. The air freely passes through the air collection cylinder 458 through the gap between the second circular cylinder 4515, the first circular cylinder 4514 and the air collection cylinder 458. During the air flow, the carbon dioxide content detector 4513 detects the carbon dioxide content in the flowing air;

[0117] The air discharged from the end of the air collection cylinder 458 away from the filter cartridge 451 enters the annular metal pipe 410 through the communication pipe 411 at the corresponding position. The air located in the annular metal pipe 410 enters other gas collection components 45 that are not in the air collection working state through the anti-blow pipes 412 and the return pipes 4510 at multiple positions. The returned air enters the cylinder body 456 through the return pipe 4510. The flowing air drives the impeller 457 to rotate. Since the impeller 457 is fixedly connected to the auger 453, therefore, when the impeller 457 rotates, the auger 453 is synchronously driven to rotate. The auger 453 uses the bristles 454 arranged on its outer surface to clean the inner wall of the filter cartridge 451. Since the multiple bristles 454 are integrally distributed in a spiral shape, the dust swept off is pushed out of the filter cartridge 451 during the rotation of the auger 453;

[0118] It should be noted that: since the air pressure in the filter cartridge 451 in the air collection working position is relatively high, the high-speed flowing air pushes the baffle b2 to block the gas return hole b1. Therefore, there is no air return in the cylinder body 456 in the air collection state;

[0119] The controller is used to control the servo motor 413 to start. The servo motor 413 drives the gear 414 to stop rotating every time it rotates a preset angle. In the present invention, the number of gas collection components 45 is set to five, that is, the corresponding preset rotation angle is seventy-two degrees. Therefore, according to the different numbers of gas collection components 45 set, the preset rotation angle of the servo motor 413 also changes correspondingly;

[0120] After the servo motor 413 drives the gear 414 to rotate by a preset angle, a gas collection assembly 45 at an adjacent position enters the position for collecting air. At this time, the air duct 6 is hermetically connected to the end of the air inlet of the filter cartridge 451 in the gas collection assembly 45 at this position. At this time, the push plate a4 and the ejector pin 416 in the air inlet assembly 4517 are facing each other. While the fan 5 inputs air into the gas collection assembly 45 at this position, the second micro electric push rod 415 can be started to push the ejector pin 416 to move a preset distance. This preset distance can satisfy the requirement that the ejector pin 416 pushes the push plate a4 to move a fixed distance. The push plate a4 drives the piston a2 to slide hermetically along the inner wall of the air cylinder a1. The air inside the air cylinder a1 is squeezed and then input into the air delivery pipe 4511. The air in the air delivery pipe 4511 enters the second circular cylinder 4515 through one end of the air delivery pipe 4511 and is input into the annular air bag 4516 at the corresponding position by the air needle inside it. At the same time, the air discharged from the other end of the air delivery pipe 4511 enters the first circular cylinder 4514 through the thick pipe 4512 and enters the annular air bag 4516 through the air needle inside it. The annular air bags 4516 installed in the first circular cylinder 4514 and the second circular cylinder 4515 expand synchronously after being inflated. Part of the air is intercepted between the first circular cylinder 4514 and the second circular cylinder 4515, so as to collect an air sample with a fixed volume. The carbon dioxide content detector 4513 can detect this part of the air sample with a fixed volume. It should be noted that after the second micro electric push rod 415 pushes the ejector pin 416 to reach the specified position, the controller controls the fan 5 to stop working immediately;

[0121] When it is necessary to adjust the position of the first circular cylinder 4514, the first micro electric push rod 47 is started by using the controller. The first micro electric push rod 47 can push the bearing plate 48 to move forward or backward by a preset distance according to a preset program. Since the limiting plates 4519 at multiple positions are slidably arranged in the annular groove 49, when the bearing plate 48 moves, it can synchronously drive the push-pull rod 4518 to move. The first circular cylinder 4514 is pushed or pulled by the push-pull rod 4518, and the thick pipe 4512 slides along the outer wall of the air delivery pipe 4511. The relative position of the first circular cylinder 4514 and the second circular cylinder 4515 changes synchronously, that is, the volume between the first circular cylinder 4514 and the second circular cylinder 4515 changes. It should be noted that the distance that the first micro electric push rod 47 pushes the bearing plate 48 to move each time is a known fixed value, and the corresponding volume between the first circular cylinder 4514 and the second circular cylinder 4515 is also a known preset value.

[0122] It should be noted that, in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0123] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sample collection device for forest carbon sink detection, comprising a support frame, characterized in that: Further included are: A box body, detachably arranged on the top of the support frame. A cover plate is rotatably arranged on the front of the box body through a hinge, and an air inlet for sample collection is opened on the front of the cover plate; A gas sample collection mechanism, arranged inside the box body, used for collecting air samples for forest carbon sink detection and adjusting the collection amount of each air sample according to the sample collection requirements to increase the sample volume; A fan, arranged inside the air inlet, used for sucking external air into the gas sample collection mechanism to complete the collection operation of air samples. A guide pipe for guiding the air flow is fixedly arranged on the gas output end of the fan; A controller, fixedly arranged on the outer wall of the box body, used for controlling the operation of all electrical equipment; The gas sample collection mechanism includes: Multiple gas collection components, distributed in a circular array, used for collecting and storing air for forest carbon sink detection and detecting the carbon dioxide content of the collected air samples; A position switching component, arranged inside the box body, used for switching the positions between multiple gas collection components to collect air samples at different time periods by using multiple gas collection components; A power component, arranged below the position switching component, used for driving the position switching component to rotate intermittently; An air flow back-blowing component, connected to multiple gas collection components at the same time, used for flowing the air flowing out of the gas collection component in the position of collecting air samples back to other gas collection components not in the position of collecting air samples again to complete the purging and cleaning operation of the gas collection components in the idle state; A sample collection amount adjustment component, arranged on one side of the position switching component, used for simultaneously adjusting the air collection capacity of multiple gas collection components to complete the collection operation of air samples with various volumes; A driving component, arranged on the side wall of the box body, used for driving the gas collection component to complete the interception operation of the air entering its interior; The position switching component includes: An annular frame, fixedly arranged inside the box body through a mounting bracket, used for providing support for installing other components; A disc, rotatably arranged inside the annular frame, and a plurality of through holes for installing gas collection components are uniformly opened on the outer wall of the disc; A toothed ring, fixedly arranged on the side wall of the disc, used for driving the disc to rotate by using the driving force of the power component.

2. The sample collection device for forest carbon sink detection according to claim 1, wherein: The power component includes: A servo motor, fixedly arranged inside the cavity of the box body. The servo motor automatically locks the output shaft after rotating a preset angle each time according to a preset program; A gear, fixedly sleeved on the output shaft of the servo motor, and the gear is meshed and connected with the toothed ring.

3. The sample collection device for forest carbon sink detection according to claim 1, characterized in that: The sample collection amount adjustment component includes: A first micro electric push rod, fixedly arranged on the outer wall of the box body. The output shaft of the first micro electric push rod slides through the box body and extends into its interior; A bearing plate, fixedly arranged on the output shaft of the first micro electric push rod, used for simultaneously controlling the gas collection amount of gas collection components at multiple positions, and an annular groove for simultaneously connecting with multiple gas collection components is opened on the outer wall of the bearing plate; The driving component includes a second micro electric push rod fixedly arranged on the inner wall of the box body through a bracket, and a thimble for cooperating with the gas collection component is also fixedly arranged on the output shaft of the second micro electric push rod.

4. The sample collection device for forest carbon sink detection according to claim 1, characterized in that: The air flow backwashing component includes: An annular metal pipe, arranged between multiple gas collection components, for collecting the air discharged from the gas collection components; Multiple connecting pipes, uniformly and fixedly arranged on the outer wall of the annular metal pipe, and each connecting pipe is respectively connected to one of the gas collection components at the corresponding position, for introducing the air in the gas collection component at the air collection position into the gas collection components at other positions; Multiple backwashing pipes, uniformly and fixedly arranged on the outer wall of the annular metal pipe, and each backwashing pipe is respectively connected to one of the gas collection components at the corresponding position, for respectively transporting the air in the annular metal pipe into the gas collection components not in the air collection state.

5. The sample collection device for forest carbon sink detection according to claim 1, characterized in that: The gas collection component includes an air filtration unit and a sample detection unit, and the air filtration unit includes: A filter cylinder, arranged in the through hole, and a cavity is formed between the filter cylinder and the inner wall of the through hole, for providing space for air flow; Two isolation rings, respectively fixedly sleeved on both sides of the outer wall of the filter cylinder, and the two isolation rings respectively seal the two ends of the cavity at the corresponding positions; An auger, rotatably arranged inside the filter cylinder, and brush hairs for cleaning the inner wall of the filter cylinder are uniformly and fixedly arranged on the outer wall of the auger, and one end of the auger rotatably penetrates through the filter cylinder and is fixedly provided with an impeller; Multiple air inlet holes, uniformly opened on the outer wall of one of the isolation rings, and an air inlet pipe for transporting air to the sample detection unit is fixedly arranged at each position corresponding to the multiple air inlet holes on the outer wall of the isolation ring; A cylinder body, fixedly arranged on the outer wall of one of the isolation rings and located outside the impeller, for collecting the refluxed air and transporting the air into the filter cylinder, and a reflux pipe is fixedly arranged at one end of the cylinder body; Multiple gas flow direction control units, uniformly arranged at one end of the filter cylinder, for transporting the air collected in the cylinder body into the filter cylinder.

6. The sample collection device for forest carbon sink detection according to claim 5, characterized in that: The gas flow direction control unit includes multiple gas reflux holes uniformly opened at one end of the filter cylinder, and a guide rod is fixedly arranged on the inner wall of each gas reflux hole through a mounting bracket. A baffle is slidably sleeved on the outer wall of the guide rod and located inside the filter cylinder, and a limiting plate is also fixedly arranged at the end of the guide rod away from the gas reflux hole. A second spring is slidably sleeved on the outer wall of the guide rod and located between the limiting plate and the baffle.

7. The sample collection device for forest carbon sink detection according to claim 5, characterized in that: The sample detection unit includes a gas collecting cylinder arranged on one side of the filter cylinder at the corresponding position. An air delivery pipe is fixedly arranged outside the gas collecting cylinder. Both ends of the air delivery pipe penetrate through the gas collecting cylinder and extend into its interior, and a thick pipe is hermetically and slidably sleeved on the outer wall of one end of the air delivery pipe. A carbon dioxide content detector is also fixedly arranged on the outer wall of the gas collecting cylinder; One end of the thick pipe and the gas transmission pipe are respectively fixedly provided with a first circular cylinder and a second circular cylinder. Annular mounting grooves are formed on the outer walls of the first circular cylinder and the second circular cylinder. An annular airbag is fixedly arranged inside the annular mounting groove. And an air inlet assembly for inflating the inside thereof is arranged on one side of the outer wall of the gas transmission pipe. A push-pull rod is fixedly arranged on the outer surface of one of the first circular cylinders, and a limiting plate is fixedly arranged at one end of the push-pull rod.

8. The sample collection device for forest carbon sink detection according to claim 7, characterized in that: The air inlet assembly includes an air cylinder and a piston slidably arranged inside the air cylinder. One end of the piston is fixedly provided with a push rod. One end of the push rod slidably penetrates through the air cylinder and is fixedly provided with a push plate. A first spring is slidably sleeved on the outer wall of the push rod between the air cylinder and the push plate.

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