A sampling device for rapid determination of carbon density of dahurian larch trunk

Abstract

This invention relates to the field of carbon density measurement and sampling technology, specifically a rapid carbon density measurement and sampling device for Dahurian larch trunks. The device includes a drive unit, a sampling rod connected to the output end of the drive unit, a retaining seat connected between the sampling rod and the drive unit, a protective cover slidably connected to the outer side of the sampling rod, a housing fixed to one side of the drive unit, a telescopic component fixed to the inner side of the housing, an impeller connected to one side of the meshing wheel, a filter on the air inlet side of the impeller, and two gear sets coaxially connected to the outer side of the output end of the drive unit. The impeller, by utilizing the force of the drive unit driving the sampling rod to rotate and drill, generates pressure to draw in cold air from the outside. After filtering out carbon-containing gases through the filter, the air is sent into the inner side of the sampling rod to cool it. Carbon-free gases are discharged from inside the sampling rod and flow out through the gap between the sampling rod and the trunk to the inner side of the protective cover, creating positive pressure inside the protective cover.

Description

Technical Field

[0001] This invention relates to the field of carbon density measurement and sampling technology, specifically to a rapid carbon density measurement and sampling device for Dahurian larch trunks. Background Technology

[0002] The core components for sampling Dahurian larch trunks mainly include a tree growth cone adapted to Dahurian larch trunks, a trunk positioning and fixing bracket, a sample sealing and storage tube, a sample slicing pretreatment mold, and a matching sterile protection and sample labeling kit. The tree growth cone, the core sampling component, is made of high-strength stainless steel and can obtain complete core samples at different trunk heights and radial depths without causing fatal damage to the tree, ensuring standardized and repeatable sampling operations. The trunk positioning and fixing bracket can precisely fix the sampling point and drilling angle, avoiding point displacement or sample breakage during sampling. It is suitable for sampling the straight trunks of Dahurian larch, significantly reducing the negative impact of sampling operations on the normal growth of the tree. The sample sealing and storage tube allows for immediate sealing and preservation of the sample after sampling, preventing moisture loss and microbial contamination, and completely preserving the annual ring structure and physiological and biochemical indicators of the core sample.

[0003] Existing general-purpose forest sampling devices suffer from two major systemic defects in field sampling operations for determining the carbon density of Dahurian larch trunks. These defects directly lead to serious deviations in the measurement results, making it impossible to provide accurate and reliable basic data for forest ecological carbon sequestration accounting. First, existing devices cannot effectively isolate exogenous carbon throughout the entire sampling process. During sampling, carbon-containing air from the outside can directly contact the sample, and carbon dioxide and volatile organic compounds in the air can mix into the sample system, causing serious distortion of the carbon content measurement value. At the same time, the sawdust generated during sampling cannot be efficiently and cleanly discharged, easily causing cross-contamination of the sample and further amplifying the measurement error. Secondly, existing devices cannot solve the problem of high-temperature friction during drilling and sampling. The heat generated by the high-speed rotation and friction between the sampling rod and the trunk will cause the organic carbon in the Dahurian larch trunk sample to decompose and be lost at high temperatures, resulting in a systematically low carbon content measurement value. Moreover, existing devices cannot achieve a closed-loop protection throughout the entire chain from drilling and sampling to sample removal. There is still a dual risk of exogenous carbon contamination and endogenous carbon loss in the sample cutting and transfer process, which cannot meet the stringent technical requirements for accurate carbon density measurement.

[0004] Therefore, this invention provides a rapid sampling device for measuring the carbon density of Dahurian larch trunks that can prevent carbon pollution and carbon loss throughout the entire process and ensure the accuracy of the measurement. Summary of the Invention

[0005] To address the problems of exogenous carbon pollution, high-temperature carbon loss, and large measurement errors in existing technologies, a rapid sampling device for measuring carbon density in the trunks of Dahurian larch trees was designed.

[0006] The technical solution adopted by this invention to solve its technical problem is: a rapid sampling device for determining the carbon density of Dahurian larch trunks, including a driving component, a sampling rod connected to the output end of the driving component, a retaining seat connected between the sampling rod and the driving component, a protective cover slidably connected to the outer side of the sampling rod, a housing fixed to one side of the driving component, a telescopic component fixed to the inner side of the housing, a connecting plate fixed to the output end of the telescopic component, a connecting ring fixed to the side of the connecting plate near the axis of the output end of the driving component, a meshing wheel rotatably connected to the inner side of the connecting ring, an impeller connected to one side of the meshing wheel, a filter element provided on the air inlet side of the impeller, and a filter element on the inner side of the sampling rod. The device is equipped with a cutting component, and two gear sets are coaxially connected to the outer side of the output end of the drive component. The sampling rod has a through hole, and the card seat has a transfer hole. The impeller uses the force of the drive component to rotate the sampling rod and drill to create pressure, drawing in cold air from the outside. After the air passes through the filter to remove carbon-containing gas, it is sent into the inside of the sampling rod to cool it down and prevent carbon loss. The carbon-free gas is discharged from the inside of the sampling rod and flows out through the gap between the sampling rod and the tree trunk to the inside of the protective cover. Positive pressure is created inside the protective cover to make the gas flow out through the gap between the protective cover and the tree trunk, preventing the inflow of carbon-containing gas from the outside.

[0007] Furthermore, a switch is provided on one side of the drive unit, and a steering knob is provided on the other side of the drive unit.

[0008] Furthermore, the sampling rod is detachably connected to the inside of the card holder, the card holder is fixedly connected to the output end of the drive component, and the outer shell is rotatably connected to the outside of the card holder. An air collection chamber is opened on the inner side of the outer shell. Under the action of the impeller, the gas is delivered to the air collection chamber and the pulsed airflow is converted into a stable airflow, eliminating the air pressure pulsation caused by rotation. Finally, after cooling the sampling rod through the adapter hole and through hole, it enters the gap between the sampling rod and the trunk, which accelerates the discharge of wood chips. At the same time, it forms a stable positive pressure that is always higher than the external environment in the sealed sampling chamber formed by the sealing cover and the trunk. The fluid always flows from the high pressure area to the low pressure area. Therefore, the air containing dust and external carbon from the outside cannot seep into the sampling chamber in the reverse direction. On the contrary, the clean airflow in the sampling chamber will continuously overflow outward through the gap of the bark, fundamentally preventing the contact between the outside air and the sample.

[0009] Furthermore, a compression ring is fixed to the outside of the sampling rod. The compression ring, in conjunction with the feeding of the sampling rod, can press the protective cover onto the surface of the tree trunk.

[0010] Furthermore, a support is fixed on the side of the drive component near the sampling rod, and a base is fixed on the inner side of the support. The fixed end of the telescopic component is fixedly connected to the support, and the output end of the telescopic component drives the connecting plate and the connecting ring to drive the meshing wheel to mesh with different gear sets.

[0011] Furthermore, one gear set is a master gear, and the other gear set is a combination of a secondary gear and a driven gear. The master gear and the secondary gear are coaxially fixed to the outside of the output end of the drive unit along the axis of the drive unit. The driven gear is rotatably connected to the inside of the base. The master gear meshes with the meshing gear, and the secondary gear meshes with the driven gear. The cooperation between the driven gear and the secondary gear enables the meshing gear to maintain its rotation direction when the output end of the drive unit rotates in both forward and reverse directions.

[0012] Furthermore, a filter screen is fixed to the side of the support near the sampling rod, and a baffle is fixed between the filter screen and the outer shell. The filter element is fixed inside the baffle. The filter screen is used to filter large dust particles, and the filter element consists of a HEPA high-efficiency filter element and a soda lime adsorption layer. The HEPA high-efficiency filter element filters particles larger than 0.3μm, and the soda lime adsorption layer adsorbs carbon dioxide gas and volatile organic compounds in the air, ensuring clean airflow with zero external carbon pollution from the source and avoiding detection errors caused by the isolation medium itself.

[0013] Furthermore, the cutting component includes an annular groove formed inside the sampling rod. A cutter is rotatably connected to the inner side of the annular groove. One end of an elastic element is fixed to the outer side of the rotating end of the cutter. A support plate is fixed to the inner side of the annular groove. A limit rod is slidably connected to the inner side of the support plate. One end of the limit rod is elastically connected to the cutter, and the other end of the elastic element is fixedly connected to the support plate. The elastic element is located outside the limit rod. When the sampling rod takes a sample, after the sample enters the inner side of the sampling rod, it cooperates with the inclined surface of the cutter away from the driving component to push the cutter into the annular groove. Before the sampling rod retracts, the sampling rod reverses one to two turns. Under the action of the elastic element, the cutter bites into the connection between the sample and the tree trunk. With the rotation of the four cutters, the sample is separated from the tree trunk, and the sample is blocked inside the sampling rod. The beneficial effects of the present invention are: (1) The rapid carbon density determination sampling device for larch trunks of the present invention removes the interference of exogenous carbon through a two-stage filtration structure. First, large particles of wood chips and dust in the air are filtered out by a filter screen. Then, small particles larger than 0.3 μm are intercepted by a HEPA high-efficiency filter element. Finally, carbon dioxide and organic carbon volatiles in the air are completely adsorbed by a soda lime adsorption layer to obtain clean airflow without exogenous carbon pollution. The clean airflow forms a stable positive pressure in the sealed sampling chamber formed by the protective cover and the trunk, ensuring that the airflow always flows out of the sampling chamber to the outside in a one-way direction, completely blocking the reverse infiltration path of carbon-containing air from the outside. At the same time, the clean airflow flows along the through hole inside the sampling rod throughout the process, continuously carrying away the heat generated by friction during the drilling and sampling process, avoiding the decomposition and loss of organic carbon in the trunk sample due to high temperature. It realizes the isolation of exogenous carbon and protection of endogenous carbon throughout the entire process from drilling and sampling to sample removal, completely eliminating the two major sources of error in the traditional sampling process, and providing accurate basic data support for forest ecological carbon sink accounting.

[0014] (2) The rapid carbon density sampling device for Dahurian larch trunk described in this invention uses a telescopic component to drive the meshing wheel to switch positions between two sets of gears. When meshing with the main gear, it can synchronously drive the impeller to rotate in the forward direction along with the drive component. When meshing with the driven wheel, it can be driven by the reversing transmission between the auxiliary gear and the driven wheel. When the drive component reverses, the meshing wheel and the impeller still maintain forward rotation, ensuring that the impeller rotation direction remains constant in the two core processes of drilling and cutting, and the airflow supply is uninterrupted throughout the process. The uninterrupted clean airflow can continuously achieve cooling, chip removal and positive pressure protection during the drilling stage. During the reverse cutting stage, it can still maintain the positive pressure environment and cooling effect in the sampling chamber, avoiding problems such as backflow of external carbon-containing air, sudden rise in sample temperature and carbon decomposition, and sawdust jamming caused by airflow interruption. It does not require additional independent air source and power device, greatly simplifies the device structure, and improves the convenience and reliability of field sampling operations.

[0015] (3) The rapid carbon density determination sampling device for Dahurian larch trunks described in this invention integrates drilling, chip removal, cooling, sample cutting, and limited extraction functions, realizing integrated and efficient operation of Dahurian larch trunk sampling, and greatly improving the efficiency and integrity of field sampling. The device completes the core processes of drilling and sample cutting by switching the drive mechanism between forward and reverse rotation. During forward drilling, the inner wall of the sample automatically compresses and stores the cutter in the annular groove, without affecting normal drilling operations. During reverse cutting, the cutter automatically pops out under the push of the elastic element, simultaneously biting into the sample root from multiple directions. As it rotates, it completes a smooth cut between the sample and the tree trunk, while stably limiting the sample to the inside of the sampling rod, preventing the sample from falling back. The device uses a compression ring on the sampling rod in conjunction with a retractable protective cover, which can adaptively press and adhere to the tree trunk surface as the drilling progresses, forming a stable and sealed sampling space. No additional fixing and sealing operations are required, making it suitable for complex tree trunk surfaces in the field. Continuous airflow can push sawdust out of the borehole quickly, avoiding drilling obstruction caused by sawdust jamming. This enables rapid sampling operations that can be completed by a single person, significantly reducing the difficulty of field sampling operations. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 for Figure 2 Enlarged view of point A; Figure 4 for Figure 2 Enlarged view of point B; Figure 5 This is a schematic diagram of the outer shell structure of the present invention; Figure 6 for Figure 5 Enlarged view of point C; Figure 7 This is a three-dimensional structural diagram of the driving component of the present invention; Figure 8 This is a three-dimensional structural diagram of the telescopic component of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the impeller of the present invention; Figure 10 This is a schematic diagram of the impeller cross-sectional structure of the present invention; Figure 11 This is a three-dimensional structural diagram of the cutting component of the present invention; Figure 12 This is a schematic diagram of the three-dimensional structure of the cutter of the present invention.

[0018] In the diagram: 1. Drive component; 101. Switch; 102. Direction knob; 2. Sampling rod; 21. Through hole; 3. Card holder; 31. Adapter hole; 4. Protective cover; 41. Extrusion ring; 5. Outer shell; 6. Filter screen; 7. Telescopic component; 71. Support; 72. Connecting plate; 73. Connecting ring; 74. Main gear; 75. Secondary gear; 76. Driven wheel; 77. Base; 8. Meshing wheel; 9. Impeller; 91. Baffle; 10. Air collection chamber; 11. Filter component; 12. Cutting component; 121. Annular groove; 122. Cutter; 123. Elastic component; 124. Support plate; 125. Limiting rod. Detailed Implementation

[0019] To make the technical means, technical features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] Example: Figures 1-12As shown, the present invention discloses a rapid sampling device for determining the carbon density of Dahurian larch trunks, comprising a drive unit 1, which consists of a motor, a reducer, a controller, and a power supply battery. A sampling rod 2 is connected to the output end of the drive unit 1, and a mounting base 3 connects the sampling rod 2 to the drive unit 1. A protective cover 4 is slidably connected to the outer side of the sampling rod 2. A housing 5 is fixed to one side of the drive unit 1, and a telescopic component 7 is fixed to the inner side of the housing 5. The telescopic component 7 can be configured as a telescopic rod or other device capable of providing force in a single direction, and is electrically connected to the controller. A steering knob is also included. When 102 rotates, the telescopic component 7 operates in conjunction with it. A connecting plate 72 is fixed to the output end of the telescopic component 7. A connecting ring 73 is fixed to the side of the connecting plate 72 near the axis of the output end of the drive component 1. The meshing wheel is rotatably connected to the inner side of the connecting ring 73. An impeller 9 is connected to one side of the meshing wheel 8. The impeller 9 is a backward-curved centrifugal impeller with 12 blades and an optimized backward-curving angle of 17°, achieving high boosting efficiency at low speeds. A filter 11 is installed on the air inlet side of the impeller 9. A cut-off component 12 is installed inside the sampling rod 2. Two gear sets are coaxially connected to the outer side of the output end of the drive component 1. The sampling rod 2 has a through hole 21 inside. The sampling rod 2 is detachably connected to the inside of the card holder 3. The card holder 3 is fixedly connected to the output end of the drive component 1. The card holder 3 has a transition hole 31 inside. The outer shell 5 is rotatably connected to the outside of the card holder 3. The inner side of the outer shell 5 has a gas collecting chamber 10. The gas is transported to the gas collecting chamber 10 under the action of the impeller 9, and the pulsed airflow is converted into a stable airflow to eliminate the air pressure pulsation caused by rotation. Finally, after cooling the sampling rod 2 through the transition hole 31 and the through hole 21, the gas enters the gap between the sampling rod 2 and the trunk, which accelerates the discharge of wood chips and seals the gap. Inside the sealed sampling chamber formed by the cover and the tree trunk, a stable positive pressure is maintained that is always higher than that of the external environment. The impeller 9, through the force of the driving component 1 driving the sampling rod 2 to rotate and drill, generates pressure to draw in cold air from the outside. After the air passes through the filter 11 to filter out carbon-containing gases, the air is sent into the inside of the sampling rod 2 to cool it down and prevent carbon loss. The carbon-free gas is discharged from the inside of the sampling rod 2 and flows out through the gap between the sampling rod 2 and the tree trunk to the inside of the protective cover 4. Positive pressure is generated inside the protective cover 4 to make the gas flow out through the gap between the protective cover 4 and the tree trunk, preventing the inflow of carbon-containing gases from the outside.

[0021] In this embodiment, before using the device, the operator attaches the protective cover 4 to the tree trunk, turns on the switch 101, and the drive component 1 drives the card holder 3 and the sampling rod 2 to rotate forward for a period of time. Then, the sampling rod 2 is moved towards the tree trunk by the handle of the drive component 1. When the drive component 1 rotates, it drives the main gear 74 to rotate forward, which in turn drives the meshing wheel 8 to rotate continuously, driving the impeller 9 to rotate. The rotation of the impeller 9 generates negative pressure inside the outer shell 5, drawing out the outside air. Since the temperature in the growing environment of Dahurian larch is already low, the cold air first passes through the filter screen 6 to remove large particles of sawdust and dust, and then passes through the filter component 11 to obtain a clean airflow without external carbon pollution. The clean airflow converges into the air collection chamber 10, and after stabilizing the air pressure, it enters through the adapter hole 31. The through hole 21 of the sampling rod 2 flows along the inner side of the sampling rod 2 towards the sampling end. During the flow, it carries away the heat generated by the rotating drilling friction of the sampling rod 2, avoiding the decomposition and loss of carbon in the tree trunk sample due to high temperature. The airflow finally flows out from the front end of the sampling rod 2. The sawdust generated during sampling flows backward along the gap between the sampling rod 2 and the tree trunk hole and enters the inner side of the protective cover 4. Since the protective cover 4 is pressed against the tree trunk surface to form a relatively closed space, the continuously input clean airflow will form a positive pressure higher than the external air pressure inside the protective cover 4, ensuring that the airflow always flows from the inside of the sampling chamber to the outside. This not only avoids the infiltration of carbon-containing air from the outside to contaminate the sample, but also pushes the sawdust out of the hole quickly, avoiding sawdust jamming and affecting drilling and sampling. Specifically, a switch 101 is provided on one side of the driving component 1, and a steering knob 102 is provided on the other side of the driving component 1. A support 71 is fixed on the side of the driving component 1 near the sampling rod 2. A base 77 is fixed on the inner side of the support 71. The fixed end of the telescopic component 7 is fixedly connected to the support 71. The meshing wheel 8 is rotatably connected to the inner side of the connecting ring 73. The output end of the telescopic component 7 drives the connecting plate 72 and the connecting ring 73 to drive the meshing wheel 8 to mesh with different gear sets. One gear set is a main gear 74, and the other gear set is a combination of a secondary gear 75 and a driven wheel 76. The main gear 74 and the secondary gear 75 are coaxially fixed on the outer side of the output end of the driving component 1 along the axis of the output end. The driven wheel 76 is rotatably connected to the inner side of the base 77. The main gear 74 meshes with the meshing wheel 8, and the secondary gear 75 meshes with the driven wheel 76. The cooperation between the driven wheel 76 and the secondary gear 75 enables the meshing wheel 8 to maintain its rotation direction when the output end of the driving component 1 rotates in both directions.

[0022] In this embodiment, after drilling to the desired depth, the operating switch 101 controls the drive component 1 to stop rotating forward. Rotating the steering knob 102 causes the telescopic component 7 to retract, driving the connecting plate 72 and connecting ring 73 to separate the meshing wheel 8 from the main gear 74 and engage with the driven wheel 76. Then, the operating switch 101 controls the drive component 1 to rotate in reverse 1 to 2 revolutions according to a preset sequence. At this time, the sampling rod 2 drives the cutter 122 to rotate in reverse, rotating out of the annular groove 121 under the push of the elastic component 123, biting into the sample root from multiple directions. As it rotates, it cuts off the sample and the main trunk. The reverse rotation of the drive component 1 drives the secondary gear 75 to rotate in reverse, and the secondary gear... Wheel 75 drives meshing wheel 8 to rotate forward via driven wheel 76, ensuring the airflow direction remains unchanged. After sampling, the cut sample is blocked and limited inside the sampling rod 2 by cutter 122. Then, the sampling rod 2 is retracted by the handle of drive component 1, allowing the complete sample to be removed. Then, the sampling container is inserted into the sampling end of sampling rod 2, squeezing the sample blade again into the annular groove 121 to release the restriction on the sample, and the sample is removed from the inside of sampling rod 2. Throughout the process, the sample will not come into contact with the external carbon-containing air, and the high temperature during sampling can also prevent carbon loss, effectively ensuring the accuracy of the carbon density measurement results. Positive pressure is formed inside the space formed by protective cover 4 and tree trunk.

[0023] Specifically, a filter screen 6 is fixed on the side of the support 71 near the sampling rod 2, and a baffle 91 is fixed between the filter screen 6 and the outer shell 5. The filter element 11 is fixed inside the baffle 91. The filter screen 6 is used to filter large dust particles. The filter element 11 is composed of a HEPA high-efficiency filter element and a soda lime adsorption layer. The HEPA high-efficiency filter element filters particles larger than 0.3μm, and the soda lime adsorption layer adsorbs carbon dioxide gas and volatile organic compounds in the air.

[0024] In this embodiment, the air first passes through filter screen 6 to remove large wood chips and dust, then through filter element 11, HEPA high-efficiency filter to remove fine particulate matter, and soda lime adsorption layer adsorbs CO2 and organic carbon components in the air, resulting in clean airflow without external carbon pollution.

[0025] Specifically, a compression ring 41 is fixed on the outside of the sampling rod 2. The compression ring 41, in conjunction with the feeding of the sampling rod 2, can press the protective cover 4 onto the surface of the tree trunk.

[0026] In this embodiment, as the driving component 1 drives the sampling rod 2 to continuously feed towards the tree trunk, the extrusion ring 41 moves forward with the sampling rod 2, gradually pressing the protective cover 4 against the surface of the tree trunk. As the extrusion ring 41 advances, the protective cover 4 will be adaptively compressed, ensuring that the end face of the protective cover 4 is always tightly attached to the tree trunk bark, forming a stable closed space, which provides a structural basis for the subsequent formation of positive pressure to isolate the outside air.

[0027] Specifically, the cutting component 12 includes an annular groove 121 formed inside the sampling rod 2. A cutter 122 is rotatably connected to the inner side of the annular groove 121. One end of an elastic element 123 is fixed to the outer side of the rotating end of the cutter 122. A support plate 124 is fixed to the inner side of the annular groove 121. A limit rod 125 is slidably connected to the inner side of the support plate 124. One end of the limit rod 125 is elastically connected to the cutter 122, and the other end of the elastic element 123 is fixedly connected to the support plate 124. The elastic element 123 is located at the limit rod 121. On the outside of 5, when the sampling rod 2 takes a sample, after the sample enters the inside of the sampling rod 2, it cooperates with the cutter 122 to push the cutter 122 into the annular groove 121 on the inclined surface away from the driving member 1. Before the sampling rod 2 retracts, the sampling rod 2 reverses one to two turns. Under the action of the elastic member 123, the cutter 122 bites into the connection between the sample and the trunk. As the four cutters 122 rotate, they separate the sample from the trunk and block the sample inside the sampling rod 2. The elastic member 123 is set as an annular spring or other device that can provide elastic force.

[0028] In this embodiment, the operating switch 101 controls the drive unit 1 to reverse 1 to 2 revolutions according to a preset direction. At this time, the sampling rod 2 drives the cutter 122 to reverse, and under the push of the elastic member 123, it rotates out of the annular groove 121 and bites into the root of the sample from multiple directions. As it rotates, it cuts off the sample and the main body of the tree trunk. The reverse rotation of the drive unit 1 drives the secondary gear 75 to reverse, and the secondary gear 75 drives the meshing wheel 8 to maintain forward rotation through the driven wheel 76, ensuring that the airflow direction remains unchanged. Working principle: Initial state as follows Figures 1-12 As shown, before using this device, the operator attaches the protective cover 4 to the tree trunk and turns on the switch 101. The drive unit 1 drives the card holder 3 and the sampling rod 2 to rotate clockwise, and the sampling rod 2 is moved towards the tree trunk by the handle of the drive unit 1. The rotation of the drive unit 1 drives the main gear 74 to rotate clockwise, causing the meshing wheel 8 to rotate and the impeller 9 to rotate, generating negative pressure inside the outer casing 5 to draw in outside air. The air passes through the filter screen 6 to remove large wood chips and dust, and then through the filter element 11 and the HEPA high-efficiency filter to remove fine particulate matter. The soda lime adsorption layer adsorbs CO2 and organic carbon components, resulting in a clean airflow. The clean airflow enters the air collection chamber 10, and after stabilizing the air pressure, it enters the through hole 21 of the sampling rod 2 through the adapter hole 31, flowing along the inside of the rod towards the sampling end, carrying away the heat generated by the rotation and drilling friction of the sampling rod 2, and preventing the decomposition and loss of carbon in the tree trunk sample. The airflow flows out from the front end of the sampling rod 2, and the wood chips mixed in flow backward along the gap into the inside of the protective cover 4, where the protective cover 4 forms positive pressure due to compression.

[0029] After drilling into position, operate switch 101 to stop the drive unit 1 from rotating forward. Rotate the steering knob 102, and the telescopic member 7 retracts, causing the meshing wheel 8 to separate from the main gear 74 and mesh with the driven wheel 76. Operate switch 101 to reverse the drive unit 1 by 1 to 2 turns. The sampling rod 2 drives the cutter 122 to rotate in reverse. Under the push of the elastic member 123, the cutter 122 rotates out of the annular groove 121 and bites into the root of the sample, cutting off the sample and the main trunk. The reverse rotation of the drive unit 1 drives the secondary gear 75 to rotate in reverse, causing the meshing wheel 8 to rotate forward through the driven wheel 76, ensuring that the airflow direction remains unchanged. After sampling is completed, the sample is blocked by the cutter 122 inside the sampling rod 2. Use the handle of the drive unit 1 to retract the sampling rod 2 and remove the complete sample. Insert the sampling container into the sampling end of the sampling rod 2, squeeze the sample cutter to the inside of the annular groove 121 to release the restriction on the sample, and remove the sample.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rapid sampling device for determining the carbon density of Dahurian larch trunks, comprising a driving component, characterized in that: The output end of the drive unit is connected to a sampling rod, and a retaining seat is connected between the sampling rod and the drive unit. A protective cover is slidably connected to the outer side of the sampling rod. A housing is fixed to one side of the drive unit, and a telescopic component is fixed to the inner side of the housing. A connecting plate is fixed to the output end of the telescopic component. A connecting ring is fixed to the side of the connecting plate near the axis of the output end of the drive unit. A meshing wheel is rotatably connected to the inner side of the connecting ring. An impeller is connected to one side of the meshing wheel. A filter is provided on the air inlet side of the impeller. A cut-off component is provided on the inner side of the sampling rod. Two gear sets are coaxially connected to the outer side of the output end of the drive unit. A through hole is opened inside the sampling rod, and a transition hole is opened inside the retaining seat.

2. The rapid sampling device for determining the carbon density of Dahurian larch trunks according to claim 1, characterized in that: A switch is provided on one side of the drive unit, and a steering knob is provided on the other side of the drive unit.

3. The rapid sampling device for determining the carbon density of Dahurian larch trunks according to claim 1, characterized in that: The sampling rod is detachably connected to the inside of the card holder. The card holder is fixedly connected to the output end of the drive component. The outer shell is rotatably connected to the outside of the card holder. An air collection chamber is opened on the inside of the outer shell. After the gas is transported to the air collection chamber by the impeller, the pulsed airflow is converted into a stable airflow, eliminating the air pressure pulsation caused by the rotation. Finally, after the sampling rod is cooled through the adapter hole and the through hole, it enters the gap between the sampling rod and the trunk. While accelerating the discharge of wood chips, it will form a stable positive pressure that is always higher than the external environment in the sealed sampling chamber formed by the sealing cover and the trunk.

4. The rapid sampling device for determining the carbon density of Dahurian larch trunks according to claim 1, characterized in that: A compression ring is fixed to the outside of the sampling rod. The compression ring, in conjunction with the feeding of the sampling rod, can press the protective cover onto the surface of the tree trunk.

5. The rapid sampling device for determining the carbon density of Dahurian larch trunks according to claim 1, characterized in that: A support is fixed to the side of the drive component near the sampling rod, and a base is fixed to the inner side of the support. The fixed end of the telescopic component is fixedly connected to the support, and the output end of the telescopic component drives the connecting plate and the connecting ring to drive the meshing wheel to mesh with different gear sets.

6. The rapid sampling device for determining the carbon density of Dahurian larch trunks according to claim 5, characterized in that: One of the gear sets is a main gear, and the other gear set is a combination of a secondary gear and a driven gear. The main gear and the secondary gear are coaxially fixed to the outside of the output end of the drive member along the axis of the drive member. The driven gear is rotatably connected to the inside of the base. The main gear meshes with the meshing gear, and the secondary gear meshes with the driven gear. The cooperation between the driven gear and the secondary gear enables the meshing gear to maintain its rotation direction when the output end of the drive member rotates in both forward and reverse directions.

7. The rapid sampling device for determining the carbon density of Dahurian larch trunks according to claim 5, characterized in that: A filter screen is fixed on the side of the support near the sampling rod. A baffle is fixed between the filter screen and the outer shell. The filter element is fixed inside the baffle. The filter screen is used to filter large dust particles. The filter element consists of a HEPA high-efficiency filter element and a soda lime adsorption layer. The HEPA high-efficiency filter element filters particles larger than 0.3μm. The soda lime adsorption layer adsorbs carbon dioxide gas and volatile organic compounds in the air.

8. The rapid sampling device for determining the carbon density of Dahurian larch trunks according to claim 5, characterized in that: The cutting component includes an annular groove formed inside the sampling rod. A cutter is rotatably connected to the inner side of the annular groove. One end of an elastic element is fixed to the outer side of the rotating end of the cutter. A support plate is fixed to the inner side of the annular groove. A limit rod is slidably connected to the inner side of the support plate. One end of the limit rod is elastically connected to the cutter, and the other end of the elastic element is fixedly connected to the support plate. The elastic element is located outside the limit rod. When the sampling rod takes a sample, after the sample enters the inner side of the sampling rod, it cooperates with the inclined surface of the cutter away from the driving component to push the cutter into the annular groove. Before the sampling rod retracts, the sampling rod reverses one to two turns. Under the action of the elastic element, the cutter bites into the connection between the sample and the trunk. With the rotation of the four cutters, the sample is separated from the trunk, and the sample is blocked inside the sampling rod.

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