Sample collection device for forest carbon sink detection

Abstract

The invention discloses a sample collection device for forest carbon sink detection, and relates to the technical field of forest carbon sink detection. By arranging the gas sample collecting mechanism, air can be sampled in different time periods by utilizing a plurality of gas collecting assemblies which are arranged in a circumferential array, so that the content of carbon dioxide in the air in the different time periods can be detected; secondly, each gas collecting assembly can dynamically monitor the air in the continuous air circulation process, part of the air passing through the gas collecting cylinders can be randomly intercepted through mutual cooperation of a first circular cylinder, a second circular cylinder, an air bag gas conveying pipe and a driving assembly, and the effect of randomly and quantitatively collecting air samples is achieved; therefore, the sample capacity can be increased, meanwhile, a fixed amount of air samples can be detected after the samples are collected, the influence of accidental errors on the detection result can be avoided by detecting a large number of samples, and the reliability of the sample detection result is 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 in 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] Referring to a collection device for distributed forest carbon sink detection disclosed in the patent application with the publication number 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 air is inhaled into the detection box body, preventing damage to the detection box body and affecting the normal use of the device; a rain shield is provided 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. When the existing forest carbon sink detection and 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 difficulty for external air to smoothly enter the detection device, thereby reducing the air sample collection speed. Cleaning the filtration device during the collection process will interrupt the sample collection process and prevent sample collection within a continuous time period, easily resulting in the lack of air samples in some time periods in the collected air samples, affecting the final sample analysis results; secondly, since only air in a flowing state can be collected and detected, a fixed volume of air sample cannot be collected, 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; for example, a distributed forest carbon sink detection collection device with the publication number CN213397851U only detects the air in a flowing state by inhaling air into the detection box body, and cannot obtain a fixed volume of air sample, 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, clogging the filter holes and causing poor air circulation. If the dust-proof layer is cleaned, air collection needs to be paused, resulting in the inability to obtain air samples within a continuous time period.

[0004] Therefore, the present invention proposes a sample collection device for forest carbon sink detection to solve the above problems. Summary of the Invention

[0005] 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 air in a flowing state 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, unable to quantify the final detection results, and reducing the accuracy and reliability of the detection results.

[0006] 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: A box body, detachably arranged on the top of the support frame. The front of the box body is rotatably provided with a cover plate through a hinge, and an air inlet for sample collection is also opened on the front of the cover plate. 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. 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 also fixedly arranged on the gas output end of the fan. A controller, fixedly arranged on the outer wall of the box body, used to control the operation of all electrical equipment.

[0007] Further, the gas sample collection mechanism includes: 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. 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. A power component, arranged below the position switching component, used to drive the position switching component to rotate intermittently. An air flow back-blowing component, connected to multiple gas collection components at the same time, used to return the air flowing out of the gas collection component in the air sample collection position to other gas collection components not in the air sample collection position to complete the purging and cleaning operation of the idle gas collection components. A sample collection volume adjustment component is provided on one side of the position switching component and is used to simultaneously adjust the air collection capacity of multiple gas collection components to complete the collection operation of air samples with various volumes. A driving component is provided on the side wall of the box body and is used to drive the gas collection component to complete the interception operation of the air entering its interior.

[0008] Furthermore, the position switching component includes: An annular frame is fixedly provided inside the box body through a mounting bracket and is used to provide support for mounting other components. A disc is rotatably provided inside the annular frame, and a plurality of through holes for mounting gas collection components are uniformly formed on the outer wall of the disc. A toothed ring is fixedly provided on the side wall of the disc and is used to drive the disc to rotate by the driving force of the power component.

[0009] Furthermore, the power component includes: A servo motor is fixedly provided 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 is fixedly sleeved on the output shaft of the servo motor, and the gear is meshed with the toothed ring.

[0010] Furthermore, the sample collection volume adjustment component includes: A first micro electric push rod is fixedly provided 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 is fixedly provided on the output shaft of the first micro electric push rod and is used to simultaneously control the gas collection volume of gas collection components at multiple positions. An annular groove for simultaneously connecting with multiple gas collection components is formed on the outer wall of the bearing plate. The driving component includes a second micro electric push rod fixedly provided on the inner wall of the box body through a bracket, and a thimble for cooperating with the gas collection component is further fixedly provided on the output shaft of the second micro electric push rod.

[0011] Furthermore, the air flow backwashing component includes: An annular metal pipe is provided between multiple gas collection components and is used to collect the air discharged from the gas collection components. A plurality of connecting pipes are uniformly fixedly provided on the outer wall of the annular metal pipe. Each connecting pipe is respectively connected to one of the gas collection components at the corresponding position and is used to introduce the air in the gas collection component at the air collection position into the gas collection components at other positions. A plurality of backflush pipes are uniformly and fixedly arranged on the outer wall of the annular metal pipe. Each of the backflush pipes is respectively connected to one of the gas collection components at the corresponding position, and is used to respectively transport the air in the annular metal pipe into the gas collection components that are not in the state of collecting air.

[0012] Further, the gas collection component includes an air filtration unit and a sample detection unit. The air filtration unit includes: A filter cartridge is arranged in the through hole. A cavity is formed between the filter cartridge and the inner wall of the through hole, which is used to provide space for air flow; Two isolation rings are respectively fixedly sleeved on both sides of the outer wall of the filter cartridge. The two isolation rings respectively seal the two ends of the cavity at the corresponding position; An auger is rotatably arranged inside the filter cartridge. Brush hairs for cleaning the inner wall of the filter cartridge are uniformly and fixedly arranged on the outer wall of the auger. And one end of the auger rotatably penetrates through the filter cartridge and is fixedly provided with an impeller; A plurality of air inlet holes are uniformly opened on the outer wall of one of the isolation rings. At the positions corresponding to the plurality of air inlet holes on the outer wall of the isolation ring, an air inlet pipe for transporting air to the sample detection unit is fixedly arranged; A cylinder body is fixedly arranged on the outer wall of one of the isolation rings and is located outside the impeller, which is used to collect the refluxed air and transport the air into the filter cartridge. One end of the cylinder body is fixedly provided with a reflux pipe; A plurality of gas flow control units are uniformly arranged at one end of the filter cartridge, which are used to transport the air collected in the cylinder body into the filter cartridge.

[0013] Further, the gas flow control unit includes a plurality of gas reflux holes uniformly opened at one end of the filter cartridge. On the inner wall of each gas reflux hole, a guide rod is fixedly arranged through a mounting bracket. A baffle is slidably sleeved on the outer wall of the guide rod and is located inside the filter cartridge. And a limit plate is 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 is located between the limit plate and the baffle.

[0014] Further, the sample detection unit includes a gas collection cylinder arranged on one side of the filter cartridge at the corresponding position. An air delivery pipe is fixedly arranged on the outside of the gas collection cylinder. Both ends of the air delivery pipe penetrate through the gas collection cylinder and extend into its interior. And on the outer wall of one end of the air delivery pipe, a thick pipe is hermetically and slidably sleeved. A carbon dioxide content detector is also fixedly arranged on the outer wall of the gas collection cylinder; One end of the thick pipe and the gas transmission pipe is respectively fixedly provided with a first circular cylinder and a second circular cylinder. Annular mounting grooves are formed in 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.

[0015] Further, 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.

[0016] The present invention provides a sample collection device for forest carbon sink detection. Compared with the prior art, it has the following beneficial effects: 1. A sample collection device for forest carbon sink detection. By setting a gas sample collection mechanism, it can use a plurality of gas collection components arranged in a circumferential array to sample the 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 the 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 gas transmission 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, 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.

[0017] 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 collection cylinder cavity between the first circular plate and the second circular plate forms different sizes. Therefore, it can use the expansion of the airbag to block the gaps between the first circular plate, the second circular plate and the inner wall of the air collection cylinder, so as to achieve the effect of intercepting part of the air samples in the air collection cylinder, and can add air samples with different capacities to the sample library, increasing the richness of the air collection samples.

[0018] 3. A sample collection device for forest carbon sink detection. By setting an air filtration unit in the gas collection component, it can filter the incoming air when the gas collection component is in the working position of collecting air samples, ensuring that the air entering the gas collection cylinder is in a clean state. The air flowing out from this position can enter the annular metal tube through the connecting pipe, and the air flow backwashing component composed of the annular metal tube, multiple backwashing pipes and multiple connecting pipes respectively inputs it to the gas collection components at other multiple positions that are not in the state of collecting air samples. Thus, the wind power of this part 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.

[0019] 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

[0020] Figure 1 is a schematic diagram of the first overall three-dimensional structure of the present invention; Figure 2 is a schematic diagram of the second overall three-dimensional structure of the present invention; Figure 3 is a schematic diagram of the first sectional structure of the present invention; Figure 4 For the present invention Figure 3 the enlarged schematic diagram of part A; Figure 5 For the present invention Figure 3 the enlarged schematic diagram of part B; Figure 6 is a schematic diagram of the second sectional structure of the present invention; Figure 7 is a schematic diagram of the third sectional structure of the present invention; Figure 8 For the present invention Figure 7 the enlarged schematic diagram of part C; Figure 9 is a schematic diagram of the disassembled state structure of the present invention; Figure 10 is a schematic diagram of the first disassembled state structure of the box body and the cover plate of the present invention; Figure 11Schematic diagram of the second disassembled state of the box body and cover plate of the present invention; Figure 12 Schematic diagram of the sectional structure of the gas sample collection mechanism of the present invention; Figure 13 Schematic diagram of the assembled state of the annular frame and the disc of the present invention; Figure 14 For the present invention Figure 12 Schematic diagram of the enlarged structure of part D therein; Figure 15 For the present invention Figure 12 Schematic diagram of the enlarged structure of part E therein; Figure 16 Schematic diagram of the first overall structure of the gas sample collection mechanism of the present invention; Figure 17 For the present invention Figure 16 Schematic diagram of the enlarged structure of part F therein; Figure 18 Schematic diagram of the second overall structure of the gas sample collection mechanism of the present invention; Figure 19 Schematic diagram of the first overall structure of the gas collection component of the present invention; Figure 20 Schematic diagram of the sectional structure of the air intake component of the present invention; Figure 21 Schematic diagram of the second overall structure of the air intake component of the present invention; Figure 22 Schematic diagram of the first sectional structure of the air intake component of the present invention; Figure 23 Schematic diagram of the second sectional structure of the air intake component of the present invention; Figure 24 Schematic diagram of the disassembled state of the air intake component of the present invention; Figure 25 For the present invention Figure 24 Schematic diagram of the enlarged structure of part G therein.

[0021] 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 inlet 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, 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, backflush pipe; 413, servo motor; 414, gear; 415, second micro electric push rod; 416, thimble; 5, fan; 6, air duct. Specific embodiments

[0022] 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.

[0023] The present invention provides two technical solutions: a sample collection device for forest carbon sink detection, specifically including the following embodiments: As Figures 1 - 11 Shown in the first embodiment: a sample collection device for forest carbon sink detection, including a support frame 1, and further including: A box body 2, detachably arranged on the top of the support frame 1. The front surface of the box body 2 is rotatably provided with a cover plate 3 through a hinge, and an air inlet for sample collection is also opened on the front surface of the cover plate 3; A gas sample collection mechanism 4, arranged inside the box body 2, 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; A blower 5 is provided inside the air inlet for sucking external air into the gas sample collection mechanism 4 to complete the collection operation of air samples. A gas guide pipe 6 for guiding the air flow is fixedly provided on the gas output end of the blower 5; after each gas collection component 45 rotates a preset angle, one gas collection component 45 is aligned with the gas guide pipe 6, and the gas guide pipe 6 can be hermetically docked with the end of the air inlet of the filter cartridge 451 in the gas collection component 45 at the aligned position. A controller is fixedly provided on the outer wall of the box body 2 for controlling the operation of all electrical equipment.

[0024] As Figures 12 - 25 The second embodiment is shown. The difference from the first embodiment is that: a sample collection device for forest carbon sink detection, the gas sample collection mechanism 4 includes: A plurality of gas collection components 45, which are distributed in a circular array, are 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 is provided inside the box body 2 for switching the positions of the plurality of gas collection components 45 to collect air samples at different time periods by using the plurality of gas collection components 45; A power component is provided below the position switching component for driving the position switching component to rotate intermittently; An air flow back-blowing component is connected to the plurality of gas collection components 45 at the same time, and is used for returning the air flowing out of the gas collection component 45 in the air sample collection position to other gas collection components 45 that are not in the air sample collection position, so as to complete the purging and cleaning operation of the idle gas collection components 45; A sample collection volume adjustment component is provided on one side of the position switching component for simultaneously adjusting the air collection capacity of the plurality of gas collection components 45 to complete the collection operation of air samples with various capacities; A driving component is provided on the side wall of the box body 2 for driving the gas collection component 45 to complete the interception operation of the air entering its interior.

[0025] The position switching component includes: An annular frame 41 is fixedly provided inside the box body 2 through a mounting bracket for providing support for mounting other components; A disc 42 is rotatably provided inside the annular frame 41, and a plurality of through holes 44 for mounting the gas collection components 45 are uniformly provided on the outer wall of the disc 42; A toothed ring 43 is fixedly provided on the side wall of the disc 42 for driving the disc 42 to rotate by the driving force of the power component.

[0026] The power component includes: 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 a preset program; after the servo motor 413 is started again, the lock on its output shaft will be automatically released. 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.

[0027] The sample collection volume adjustment component includes: 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. 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 components 45 at multiple positions simultaneously. And an annular groove 49 for connecting with a plurality of gas collection components 45 simultaneously is formed on the outer wall of the bearing plate 48. 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, and 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.

[0028] The air flow backwashing component includes: 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 components 45. 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 with 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 components 45 at other positions. A plurality of backwashing pipes 412 are uniformly and fixedly arranged on the outer wall of the annular metal pipe 410. Each backwashing pipe 412 is respectively connected with 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 components 45 that are not in the air collection state.

[0029] The gas collection component 45 includes an air filtering unit and a sample detecting unit. The air filtering unit includes: The 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. Two isolation rings 452 are respectively and fixedly sleeved on both sides of the outer wall of the filter cylinder 451. The two isolation rings 452 respectively seal both ends of the cavity 46 at the corresponding positions. The 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 the filter cylinder 451 and is fixedly provided with an impeller 457. A plurality of air inlet holes 455 are uniformly formed in the outer wall of one of the isolation rings 452. An air inlet pipe 459 for conveying air to the sample detection unit is fixedly arranged at a position corresponding to each of the air inlet holes 455 on the outer wall of the isolation ring 452. The cylinder body 456 is fixedly arranged on the outer wall of one of the isolation rings 452 and outside the impeller 457, and is used for collecting the refluxed air and conveying 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 corresponding cylinder body 456, and the other end is fixedly connected to the corresponding backwashing pipe 412. A plurality of connecting pipes 411 are communicated with the inside of the corresponding air collecting cylinder 458. A plurality of gas flow direction control units are uniformly arranged at one end of the filter cylinder 451 and are used for conveying the air collected in the cylinder body 456 into the filter cylinder 451.

[0030] The gas flow direction control unit includes a plurality of gas reflux holes b1 uniformly formed at one end of the filter cylinder 451. A guide rod b3 is fixedly arranged on the inner wall of each gas reflux hole b1 through a mounting bracket. A baffle b2 is slidably sleeved on the outer wall of the guide rod b3 inside the filter cylinder 451. A limiting plate is fixedly arranged at one end of the guide rod b3 away from the gas reflux 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 reflux 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 closely attached to the inner wall of the filter cylinder 451, the gas reflux hole b1 can be completely sealed.

[0031] The sample detection unit includes an air collecting cylinder 458 arranged on one side of the corresponding filter cylinder 451. An air conveying pipe 4511 is fixedly arranged outside the air collecting cylinder 458. Both ends of the air conveying pipe 4511 penetrate the air collecting cylinder 458 and extend into its interior. A thick pipe 4512 is hermetically and slidably sleeved on the outer wall of one end of the air conveying pipe 4511. A carbon dioxide content detector 4513 is also fixedly arranged on the outer wall of the air collecting cylinder 458. The air conveying pipe 4511 and the thick pipe 4512 are both rigid steel pipes and 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 the air collecting cylinder 458 and extends into the interior for detecting the carbon dioxide content in the air. One end of the thick pipe 4512 and the gas transmission pipe 4511 are respectively fixedly provided with a first circular cylinder 4514 and a second circular cylinder 4515. Annular mounting 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 mounting groove. And an air inlet assembly 4517 for inflating the inside thereof is arranged on one side of the outer wall of the gas transmission pipe 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 on one side of the carbon dioxide content detector 4513, that is, to ensure that the carbon dioxide 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 gas collecting cylinder 458. When the annular airbag 4516 is not inflated and expanded, air can freely pass through the gas 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 gas collecting cylinder 458, so that the cavity of the gas collecting cylinder 458 located between the first circular cylinder 4514 and the second circular cylinder 4515 is in a sealed state; air needles communicating with their interiors are fixedly arranged in the annular mounting 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 transmission pipe 4511, the air then enters the annular airbag 4516 through the air needles.

[0032] The air inlet assembly 4517 includes a cylinder a1 and a piston a2 slidably arranged inside the 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 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 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 cylinder a1 is fixedly connected to the gas transmission pipe 4511 at the corresponding position, and their inner cavities are communicated, that is, the air discharged from the cylinder a1 can enter the gas transmission pipe 4511.

[0033] 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 inlet end of the filter cartridge 451 in the gas collection component 45 is in close contact with the air duct 6 to achieve a sealed connection. The fan 5 sucks external air through the air duct 6 and enters 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 air inlet holes 455 and the air inlet 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; 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 working state of collecting air 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 and the auger 453 are fixedly connected, 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; It should be noted that: since the air pressure in the filter cartridge 451 in the working position of collecting air 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 state of collecting air; 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 five, that is, the corresponding preset rotation angle is 72 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; After the servo motor 413 drives the gear 414 to rotate 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 inlet end 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 activated 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 compressed and then input into the air duct 4511. The air in the air duct 4511 enters the second circular cylinder 4515 through one end of the air duct 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 duct 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, and part of the air is intercepted between the first circular cylinder 4514 and the second circular cylinder 4515, thereby collecting 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; When it is necessary to adjust the position of the first circular cylinder 4514, the first micro electric push rod 47 is activated by the controller. The first micro electric push rod 47 can push the bearing plate 48 to move forward or backward 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 duct 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.

[0034] 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 further includes elements inherent to such process, method, article or device.

[0035] 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: Also includes: The box body is detachably arranged on the top of the support frame, and a cover plate is arranged on the front of the box body through a hinge, and an air inlet for sample collection is also opened on the front of the cover plate; A gas sample collection mechanism is arranged inside the box, and is 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; A fan is arranged inside the air inlet, and is used to draw external air into the gas sample collection mechanism to complete the air sample collection operation. An air guide pipe for guiding the air flow direction is also fixedly arranged on the gas output end of the fan; The controller is fixedly arranged on the outer wall of the box body and is used to control the operation of all electrical equipment.

2. A sample collection device for forest carbon sink detection according to claim 1, characterized in that: The gas sample collection mechanism comprises: A plurality of gas collection components are arranged in a ring array, and are used to collect and store air for forest carbon sink detection, and to detect the carbon dioxide content of the collected air samples; A position switching component is arranged inside the box body and is used to switch the positions between the multiple gas collecting components so as to use the multiple gas collecting components to collect air samples of different time periods; A power assembly is arranged below the position switching assembly and is used to drive the position switching assembly to rotate intermittently; An airflow backflush assembly is connected to a plurality of gas collection assemblies at the same time, and is used to return the air flowing out of a gas collection assembly at a position for collecting air samples to other gas collection assemblies that are not at a position for collecting air samples, so as to complete the purging and cleaning operation of the idle gas collection assemblies; The sample collection volume adjustment component is arranged on one side of the position switching component and is used to simultaneously adjust the volume of air collected by multiple gas collection components to complete the collection operation of air samples of various volumes; The driving assembly is arranged on the side wall of the box body and is used to drive the gas collecting assembly to complete the interception operation of the air entering the interior thereof.

3. A sample collection device for forest carbon sink detection according to claim 2, characterized in that: The position switching component comprises: The ring frame is fixed inside the box through a mounting bracket to provide support for the installation of other components; The disc is rotatably arranged inside the annular frame, and a plurality of through holes for installing the gas collection assembly are evenly opened on the outer wall of the disc; The gear ring is fixedly arranged on the side wall of the disc and is used to drive the disc to rotate by utilizing the driving force of the power assembly.

4. A sample collection device for forest carbon sink detection according to claim 3, characterized in that: The power assembly comprises: A servo motor is fixedly arranged inside the cavity of the box body, and the servo motor automatically locks the output shaft each time it rotates a preset angle according to a preset program; The gear is fixedly sleeved on the output shaft of the servo motor, and the gear and the gear ring are meshed and connected with each other.

5. A sample collection device for forest carbon sink detection according to claim 2, characterized in that: The sample collection volume adjustment component comprises: A first micro electric push rod is fixedly arranged on the outer wall of the box body, and an output shaft of the first micro electric push rod slides through the box body and extends into the inside thereof; A bearing plate is fixedly arranged on the output shaft of the first micro electric push rod, and is used to simultaneously control the gas collection amount of the gas collection components at multiple positions, and an annular groove for connecting with multiple gas collection components at the same time is formed on the outer wall of the bearing plate; The driving assembly comprises a second micro electric push rod fixedly arranged on the inner wall of the box body through a bracket, and a pin for cooperating with the gas collection assembly is also fixedly arranged on the output shaft of the second micro electric push rod.

6. A sample collection device for forest carbon sink detection according to claim 2, characterized in that: The airflow backflush assembly comprises: an annular metal pipe, disposed between the plurality of gas collecting assemblies, for collecting air exhausted from the gas collecting assemblies; A plurality of connecting pipes are evenly and fixedly arranged on the outer wall of the annular metal pipe, each of the connecting pipes is respectively connected to a gas collecting assembly at a corresponding position, and is used to introduce the air in the gas collecting assembly at the air collecting position into the gas collecting assembly at other positions; A plurality of backflush tubes are evenly and fixedly arranged on the outer wall of the annular metal tube, and each of the backflush tubes is respectively connected to a gas collecting assembly at a corresponding position, and is used to transport the air in the annular metal tube to the gas collecting assembly that is not in the air collecting state.

7. A sample collection device for forest carbon sink detection according to claim 2, characterized in that: The gas collection assembly includes an air filter unit and a sample detection unit, and the air filter unit includes: A filter cartridge is disposed in the through hole, and a cavity is formed between the filter cartridge and the inner wall of the through hole to provide space for air flow; Two isolation rings are fixedly sleeved on both sides of the outer wall of the filter cartridge, and the two isolation rings respectively block the two ends of the cavity at the corresponding positions; An auger is rotatably arranged inside the filter cartridge, bristles for cleaning the inner wall of the filter cartridge are evenly and fixedly arranged on the outer wall of the auger, and one end of the auger rotates through the filter cartridge and is fixedly provided with an impeller; A plurality of air inlet holes are evenly arranged on the outer wall of one of the isolation rings, wherein an air inlet pipe for conveying air to the sample detection unit is fixedly arranged on the outer wall of the isolation ring and at positions corresponding to the plurality of air inlet holes; The cylinder is fixedly arranged on the outer wall of one of the isolation rings and is located outside the impeller, and is used to collect the refluxed air and transport the air into the filter cylinder. A reflux pipe is fixedly arranged at one end of the cylinder; A plurality of gas flow control units are evenly arranged at one end of the filter cartridge and are used to transport the air collected in the cartridge body into the filter cartridge.

8. A sample collection device for forest carbon sink detection according to claim 7, characterized in that: The gas flow control unit includes a plurality of gas return holes evenly arranged at one end of the filter cartridge, a guide rod is fixedly provided on the inner wall of each of the gas return holes through a mounting frame, a baffle is provided on the outer wall of the guide rod and is located in the inner sliding sleeve of the filter cartridge, and a limit plate is fixedly provided at the end of the guide rod away from the gas return hole, and a No. 2 spring is provided on the outer wall of the guide rod and is located in the sliding sleeve between the limit plate and the baffle.

9. A sample collection device for forest carbon sink detection according to claim 7, characterized in that: The sample detection unit includes a gas collecting cylinder arranged on one side of the filter cylinder at a corresponding position, a gas delivery pipe is fixedly arranged on the outside of the gas collecting cylinder, both ends of the gas delivery pipe penetrate the gas collecting cylinder and extend to the inside thereof, and a thick tube is sealed and slidably sleeved on the outer wall of one end of the gas delivery pipe, and a carbon dioxide content detector is also fixedly arranged on the outer wall of the gas collecting cylinder; A No. 1 circular cylinder and a No. 2 circular cylinder are fixedly provided at one end of the thick tube and the air delivery pipe, respectively. Annular mounting grooves are provided on the outer walls of the No. 1 circular cylinder and the No. 2 circular cylinder. An annular air bag is fixedly provided inside the annular mounting groove, and an air intake assembly for inflating air into the interior is also provided on one side of the outer wall of the air delivery pipe. A push-pull rod is fixedly provided on the outer surface of one of the No. 1 circular cylinders, and a limiting plate is fixedly provided at one end of the push-pull rod.

10. A sample collection device for forest carbon sink detection according to claim 9, characterized in that: The air intake 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 slides through the air cylinder and is fixedly provided with a push plate, and a No. 1 spring is slidably sleeved on the outer wall of the push rod and located between the air cylinder and the push plate.

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