Sugarcane field soil greenhouse gas collection device
By optimizing the snap-fit structure between the base and the box and the integrated stopcock valve design, the problems of fixing difficulties and sampling errors in the static box method in sugarcane fields were solved, realizing efficient, stable collection of greenhouse gases from sugarcane soil and convenient operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGXI TEACHERS EDUCATION UNIV
- Filing Date
- 2025-07-16
- Publication Date
- 2026-05-29
AI Technical Summary
When the existing static box method is applied in sugarcane fields, there are problems such as the fixed tube body being easily obstructed by stalks, inconvenient air passage system, lack of heat insulation design and poor base stability, which leads to cumbersome sampling operation and data distortion.
A greenhouse gas collection device for sugarcane field soil was designed, comprising a square hollow base and a rectangular hollow box. The base is nested and snapped into the collection body through a slot, covered with a reflective heat-insulating film, and integrates a stopcock valve and a standardized sampling port. Combined with stainless steel materials and an anchoring structure, it enables rapid assembly and disassembly and stable sampling.
It enables rapid positioning in sugarcane fields, reduces the risk of gas leakage, and lowers sampling errors. It is suitable for long-term fixed-point monitoring in soft soil, with gas temperature controlled within ±2℃. It supports portable operation and rapid replacement of standardized sampling ports.
Smart Images
Figure CN224303388U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of soil greenhouse gas collection equipment, specifically a soil greenhouse gas collection device for sugarcane fields. Background Technology
[0002] Farmland ecosystems are a key source of greenhouse gas emissions, and the CO2 and CH4 they release significantly exacerbate global warming. Static chamber methods, due to their ease of operation and controllable cost, have become the mainstream technology for monitoring greenhouse gas fluxes in farmland. Existing technologies, represented by patent CN108844789A, utilize multi-stage gas diffusion balance tube designs to achieve stratified gas collection from flooded soils, achieving some success in scenarios such as paddy fields. However, this technology faces severe challenges in sugarcane fields: Guangxi Zhuang Autonomous Region, as my country's core sugarcane producing area (accounting for over 60% of the national planting area), has sugarcane fields characterized by tall plants, narrow row spacing, and high surface temperatures. The universal chamber structure of CN108844789A is difficult to adapt—its fixed tube structure is easily obstructed by stalks in densely planted sugarcane fields, leading to sealing failure; the lack of an integrated gas path system (requiring an external air pump and dryer) makes mobile sampling in the field extremely inconvenient; and the lack of insulation design causes deviations in the gas temperature inside the chamber due to direct sunlight. More importantly, existing devices are not optimized for the stability of the base in the soft soil of sugarcane fields, making them prone to tipping and displacement during sampling, leading to distortion of long-term fixed-point monitoring data. Therefore, developing a dedicated gas sampling device for sugarcane fields that combines resistance to high-temperature interference, lodging prevention, stability, and portability is of urgent practical significance for promoting carbon emission reduction research in my country's sugarcane ecosystem. Utility Model Content
[0003] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.
[0004] Another objective of this invention is to provide a greenhouse gas collection device for sugarcane field soil, which can solve the problems of existing static boxes being unable to be quickly disassembled and assembled, and the sampling operation being cumbersome.
[0005] To achieve these objectives and other advantages of this utility model, a greenhouse gas collection device for sugarcane field soil is provided, which includes a base and a collection body;
[0006] The base has a square hollow structure, and includes a slot at the upper end and a fixing part at the lower end.
[0007] The data acquisition body includes a rectangular hollow box with an open bottom and a data acquisition component. The bottom of the box is nested and engaged with a slot. The data acquisition component is disposed on the top of the box and includes:
[0008] A plastic flexible tube, one end of which passes through the top of the collector body and connects to the inside of the box;
[0009] A stopcock valve includes a valve body and a regulating valve. The valve body is a barrel-shaped structure with one open end. The valve body is provided with port A and port B. The regulating valve is rotatably inserted into the valve body from the open end to control the opening and closing of port A and port B. Port A is threadedly connected to a plastic hose, and port B is threadedly connected to a hexagonal knob. The center of the hexagonal knob has a hollow structure, and the free end of the hexagonal knob is provided with a plastic sampling port with a sealing ring.
[0010] Preferably, the long side of the fixing part is 30 cm to 35 cm, the wide side is 15 cm to 20 cm, and the height is 7 cm to 10 cm;
[0011] The long side of the card slot is 32 cm to 35 cm, the wide side is 20 cm to 25 cm, and the height is 3 cm to 5 cm.
[0012] The main body of the sample has a long side dimension of 30 cm to 32 cm, a wide side dimension of 20 cm to 22 cm, and a height of 30 cm to 35 cm.
[0013] Preferably, the top of the housing has two symmetrically arranged handles that can rotate 180°.
[0014] Preferably, the outer surface of the enclosure is covered with an external reflective heat-insulating film.
[0015] Preferably, the reflective heat insulation film consists of a heat insulation cotton base layer and an aluminum foil outer layer, with the aluminum foil outer layer having a reflectivity greater than 85%.
[0016] Preferably, the thickness of the insulation cotton base layer is 5 mm-8 mm, and the thickness of the aluminum foil outer layer is 0.1 mm-0.3 mm.
[0017] Preferably, the plastic sampling port of the hexagonal screw is compatible with the standard interface of the syringe.
[0018] Preferably, it also includes a timer and two thermometers, with the timer located on the top of the enclosure and the two thermometers located outside and inside the enclosure, respectively.
[0019] Preferably, a horizontal plate is provided at the bottom of the card slot, and the horizontal plate is made of stainless steel.
[0020] This invention offers at least the following advantages: The layered base provides anchoring force through deep insertion of the fixing part into the soil; the slot part forms a clearance fit with the bottom opening of the collection body, enabling rapid positioning and separation; the three-port stopcock valve controls the on / off state of ends A and B through the rotation angle of the triangular regulating valve, replacing the traditional multi-valve series structure and reducing the risk of air leakage at connection points; the hexagonal screw integrates a plastic sampling port (with an embedded O-ring seal), directly matching the standard syringe interface and eliminating adapter parts. The width of the slot part forms an interference fit with the collection body, preventing lateral swaying.
[0021] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description
[0022] Figure 1 This is a structural schematic diagram of one technical solution of this utility model;
[0023] Figure 2 This is a schematic diagram of the structure of the base of this utility model;
[0024] Figure 3 This is a schematic diagram of the structure of the acquisition component on the housing;
[0025] Figure 4 This is a schematic diagram of the acquisition component.
[0026] Figure 5 This is a schematic diagram showing the deployment of the device of this utility model in a sugarcane field.
[0027] 1. Base; 2. Level plate; 3. Acquisition body; 4. Box; 5. Handle; 6. Acquisition component; 7. Plastic hose; 8. Plug valve; 9. Port A; 10. Port B; 11. Port C; 12. Adjusting valve; 13. Hexagonal screw. Detailed Implementation
[0028] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.
[0029] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
[0030] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials described are commercially available. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0031] like Figure 1-5 As shown, this utility model provides a greenhouse gas collection device for sugarcane field soil, which includes a base 1 and a collection body 3;
[0032] The base 1 has a square hollow structure, and the base 1 includes a slot at the upper end and a fixing part at the lower end;
[0033] The data acquisition body 3 includes a rectangular hollow box 4 with an open bottom and a data acquisition component 6. The bottom of the box 4 is nested and engaged with a slot, and the data acquisition component 6 is disposed on the top of the box 4. The data acquisition component 6 includes:
[0034] Plastic flexible hose 7, one end of which passes through the top of the collector body and connects to the inside of the box 4;
[0035] A stopcock valve 8 includes a valve body and a regulating valve 12. The valve body is a barrel-shaped structure with one open end. The valve body is provided with port A 9 and port B 10. The regulating valve 12 is rotatably inserted into the valve body from the open end to control the opening and closing of port A 9 and port B 10. Port A 9 is threadedly connected to a plastic hose 7. Port B 10 is threadedly connected to a hexagonal screw 13. The center of the hexagonal screw 13 has a hollow structure. The free end of the hexagonal screw 13 is provided with a plastic sampling port with a sealing ring.
[0036] The base 1 features a square, hollow design and can be made of stainless steel. The upper slot dimensions are 32.5 cm long, 22.5 cm wide, and 3 cm high, while the lower fixing part dimensions are 30 cm long, 17 cm wide, and 7 cm high. A serrated steel plate can be installed at the bottom of the fixing part to be inserted into the soil for enhanced anchoring. A stainless steel horizontal plate 2 (3 mm thick) is embedded within the slot, and the slot fits tightly against the bottom of the collection body 3.
[0037] The main body 3 is a rectangular hollow box 4 (31 cm long × 20.5 cm wide × 32 cm high), welded from 1 mm thick stainless steel plate. The box 4 is covered with a reflective heat-insulating film, which is composed of 7 mm thick closed-cell rubber-plastic insulation cotton (thermal conductivity 0.035 W / m·K) composited with 0.2 mm thick aluminum foil (reflectivity ≥85%). Two symmetrical 180° rotating handles 5 are installed on the top of the box 4, with 304 stainless steel bearings on the shafts. An L-shaped retaining edge (15 mm wide) can also be provided at the bottom opening edge of the box 4. This retaining edge is nested into the groove of the base 1 and sealed by adding water into the groove.
[0038] One end of the plastic tubing 7 (6 mm inner diameter) passes through the top hole of the box 4, is fixed with silicone sealant, and connects to the inside of the box 4; the other end is connected to port 9 of the stopcock valve 8 via an M10 thread. The stopcock valve 8 has a PVC barrel-shaped structure (50 mm high), and port 10 is threaded to a hexagonal knob 13 (19 mm distance across sides). The knob has a hollow center (8 mm diameter hole), and the end is fitted with a plastic sampling port with a nitrile rubber O-ring (compliant with ISO 594-1 syringe interface standard). During operation:
[0039] 1. Insert the syringe into the plastic sampling port; 2. Rotate the triangular adjusting valve 1290° to connect ports AB 10;
[0040] 3. Draw a 50 mL gas sample (syringe sizes of 20 / 50 / 100 mL are available).
[0041] 4. Close regulating valve 12, and the sampling port will automatically seal after the syringe is pulled out.
[0042] Technical benefits: This implementation method reduces sampling displacement errors by optimizing the anchoring structure of the base 1 and the snap-fit accuracy of the housing 4; the integrated stopcock valve 8 reduces the risk of air leakage; and the standardized sampling port supports quick syringe replacement, with a single sampling time of ≤180 seconds. It is suitable for long-term fixed-point monitoring of soft soil (bulk density 1.2-1.4 g / cm³) in sugarcane fields.
[0043] In another technical solution, the long side of the fixing part is 30 cm to 35 cm, the wide side is 15 cm to 20 cm, and the height is 7 cm to 10 cm;
[0044] The long side of the card slot is 32 cm to 35 cm, the wide side is 20 cm to 25 cm, and the height is 3 cm to 5 cm.
[0045] The long side of the collecting body 3 is 30 cm to 32 cm, the wide side is 20 cm to 22 cm, and the height is 30 cm to 35 cm.
[0046] The long side of the fixing part can be 32 cm, the wide side can be 18 cm, and the height can be 8 cm. The long side of the slot part can be 33 cm, the wide side can be 22 cm, and the height can be 4 cm. A horizontal plate 2 (33 cm × 22 cm) can be installed at the bottom of the slot part. The material can be stainless steel, and it can be fixed to the bottom surface of the slot part by nesting.
[0047] The main body 3 can have a long side dimension of 31 cm, a wide side dimension of 20.5 cm, and a height of 32 cm. The housing 4 can be made of 1.2 mm thick aluminum alloy plate riveted together or stainless steel welded together, and the inner surface can be coated with an epoxy anti-corrosion coating.
[0048] Technical benefits: This size combination ensures that the upper edge of the slot is above the ground after the base 1 is inserted into the soil, preventing rainwater backflow; the gap between the box 4 and the slot is ≤0.5 mm, which reduces the amount of water used for liquid sealing.
[0049] In another technical solution, the valve body is also provided with a C port, which is connected to a hexagonal knob by a thread to serve as a backup port for the B port. That is, when the B port cannot be used normally, the regulating valve can be rotated to connect the A port and the C port to form a passage.
[0050] In another technical solution, two handles 5 that can rotate 180° are symmetrically arranged on the top of the box 4.
[0051] The two symmetrically arranged rotating handles 5 can be made of stainless steel with a width of 10 cm and a grip diameter of 25 mm, and the internal rotating shaft can be made of stainless steel pin with a diameter of 8 mm. The base of the handles 5 is fixed to the top two sides of the box body 4 with M6 bolts, and the assembly position is 10 cm from the side edge of the box body 4 and 15 cm from the front edge. Nylon gaskets (1 mm thick) can be installed at both ends of the rotating shaft to reduce friction, and limit buckles are set to precisely control the rotation angle within the range of 180°±5°.
[0052] The rotating mechanism of handle 5 can use a copper alloy bushing (inner diameter 8.1 mm) with a clearance fit (0.1 mm) with the pin shaft. The bushing is bonded to the mounting hole on the top of the housing 4 with epoxy resin adhesive. During operation, the handle 5 can be lifted upwards to a 90° position for single-person carrying.
[0053] The surface of handle 5 can be covered with a 3 mm thick corrugated anti-slip rubber sleeve (Shore hardness 60±3), and the rubber surface can be pressed with anti-slip textures with a depth of 1.5 mm.
[0054] Technical benefits: The handle 5 is designed to meet the needs of single or double people for handling.
[0055] In another technical solution, the outer surface of the enclosure 4 is covered with an external reflective heat insulation film.
[0056] The outer surface of enclosure 4 can be covered with a reflective heat-insulating film. This film can be a double-layer composite structure: the inner layer is 6 mm thick closed-cell rubber-plastic heat-insulating cotton (thermal conductivity ≤0.038 W / m·K), and the outer layer is 0.15 mm thick calendered aluminum foil (reflectivity ≥85%). The heat-insulating film can be cut into rectangular pieces that match the surfaces of enclosure 4, and bonded to the outer wall of enclosure 4 with high-temperature resistant silicone adhesive (operating temperature -40℃ to 200℃). The seams overlap by 10 mm and are sealed with aluminum foil tape. During assembly, first clean the surface of enclosure 4, apply adhesive with a thickness of 0.5 mm, and cure under pressure for 24 hours.
[0057] The insulation cotton base layer can be 7 mm thick, with a density of 40±5 kg / m³ and a tensile strength ≥80 kPa. The aluminum foil outer layer can be 0.2 mm thick, and its surface can be textured (0.05 mm deep) to enhance light scattering. Tests show that under ambient temperature of 35℃ and solar radiation intensity of 1000 W / m², the internal temperature rise rate of the box 4 covered with this film is ≤1.8℃ / h, while the temperature rise of the control box 4 without the film reaches 6.2℃ / h.
[0058] Technical effect: This implementation method controls the internal temperature fluctuation of the chamber 4 within ±2℃ under strong sunlight (≥30℃) in summer, reducing the concentration error of gas samples caused by thermal expansion.
[0059] In another technical solution, the reflective heat insulation film consists of a heat insulation cotton base layer and an aluminum foil outer layer, with the aluminum foil outer layer having a reflectivity greater than 85%.
[0060] The composite of thermal insulation cotton and aluminum foil can be formed by roll forming with hot melt adhesive film (0.05 mm thick) at 120℃. After continuous exposure in a high temperature and high humidity environment (40℃ / 90%RH) for 30 days, the peel strength of the composite layer remains ≥8 N / cm. After the enclosure 4 is assembled, the surface temperature uniformity is detected using an infrared thermal imager. At an ambient temperature of 35℃, the temperature difference between the surfaces of enclosure 4 is ≤1.5℃.
[0061] Technical effect: This thickness combination ensures flexibility (bending radius ≥ 50 mm) while keeping the internal gas temperature fluctuation range of the box 4 within ± 1.5℃ in the summer sugarcane field environment (surface temperature ≥ 50℃).
[0062] In another technical solution, the thickness of the insulation cotton base layer is 5 mm-8 mm, and the thickness of the aluminum foil outer layer is 0.1 mm-0.3 mm.
[0063] The thickness of the insulation cotton base layer can be 6.0 mm. During assembly on the four surfaces of the enclosure, first apply a two-component polyurethane adhesive (300 g / m²), then press the cut insulation cotton sheets onto each plane of the enclosure. For the edges of the enclosure, the insulation cotton can be cut at a 45° bevel, and the seams should be filled with foam sealant (width ≥ 5 mm). The thickness tolerance should be controlled within ±0.2 mm, and a laser thickness gauge should be used for full inspection.
[0064] The outer layer thickness of the aluminum foil can be 0.25 mm, and H18 aluminum plate can be used. Before laminating the aluminum foil with the insulation cotton, the surface can be chemically passivated (film weight 1.2 g / m²), and then coated with acrylic protective varnish (dry film thickness 10 μm). During assembly, the aluminum foil joints are double-fixed by overlapping and riveting: first, overlap the aluminum foil tape by 15 mm, and then fix it with stainless steel blind rivets spaced 40 mm apart.
[0065] In another technical solution, the plastic sampling port of the hexagonal screw 13 is matched with the standard interface of the syringe.
[0066] The hexagonal button 13 can be injection molded from polyoxymethylene engineering plastic, with a side distance of 19 mm (conforming to the size of an M12 hexagonal nut according to GB / T 3106 standard), and a central hollow hole diameter of 8.0±0.1 mm. The bottom of the button can be provided with an M12×1.25 internal thread to engage with the external thread of the stopcock valve 8B port 10, with the assembly torque controlled at 3.5±0.5 N·m. A 6 mm diameter countersunk groove can be formed on the top plane of the button to fix the plastic sampling port.
[0067] The plastic sampling port can be made of medical-grade polycarbonate, with an outer diameter of 8.0 mm (ISO 594-1 standard Luer connector size) and an inner taper of 6% (tolerance ±0.1%). The sampling port base can be press-fitted into the recessed screw (interference 0.05 mm), and a groove can be cut at the bottom of the base to embed a nitrile rubber O-ring (1.8 mm wire diameter, hardness 70±5 Shore A). This interface can be directly plugged into a standard 20 / 50 / 100 mL syringe (interface taper 6%).
[0068] During operation, insert the syringe connector vertically into the plastic sampling port until fully in place (insertion depth ≥ 7 mm). At this point, the O-ring will deform under pressure, generating a radial sealing force ≥ 0.3 MPa. During sampling, when the stopcock valve 8 and the triangular regulating valve 12 are rotated to the AB passage open position, the gas inside the chamber enters the syringe through the plastic hose 7 → end A of the stopcock valve 8 → end B → the center hole of the hexagonal screw 13 → the sampling port. After sampling, remove the syringe.
[0069] Technical benefits: This implementation method enables tool-free and rapid connection between the syringe and the sampling port, with a single insertion / removal time of ≤3 seconds; the standardized interface is compatible with all commercially available Luer connector syringes, avoiding additional dead volume caused by adapters (measured dead volume ≤0.15 mL); the O-ring sealing design maintains its sealing effectiveness even after 200 insertion / removal cycles in the high-dust environment of sugarcane fields, meeting the requirement of continuous single-point sampling for 12 months.
[0070] In another technical solution, a timer and two thermometers are also included. The timer is set on the top of the box 4, and the two thermometers are set on the outside and inside of the box 4, respectively.
[0071] The timer can be a digital display electronic type (accuracy ±1 second / day), with an IP65 protection rating. It can be mounted on any easily observable position on the top surface of the enclosure (4) via a stainless steel bracket (1.2 mm thick). The timer is powered by a CR2032 button battery (220 mAh capacity), and the sampling interval is programmable (10 / 20 / 30 min selectable). During assembly, a 25 mm opening is made in the top of the enclosure (4) to embed the timer, and the seams are filled with silicone rubber sealant (≥5 mm width).
[0072] The external thermometer can be a rod-shaped mercury thermometer (range -10℃ to 50℃), installed on the north-facing outer wall of chamber 4 (avoiding direct sunlight) at a height of 120 cm from the ground, and secured with elastic clamps. The internal thermometer can be a PT100 platinum resistance sensor (accuracy ±0.3℃), with the probe suspended 10 cm below the top plate of chamber 4, and the wires leading out through a sealed gland to connect to the external reading instrument. The thermometer installation position should be at least 20 mm away from the chamber wall to reduce the impact of heat conduction.
[0073] During operation:
[0074] 1. Record the initial time (T0) and internal and external temperatures (Texternal0, Tinternal0) after the device is placed.
[0075] 2. Start the timer, and a buzzer will sound when the set interval (e.g., 10 minutes) is reached;
[0076] 3. Read and record the current internal and external temperatures (Texternal1, Tinternal1);
[0077] 4. Open the stopcock valve 8 and the triangular regulating valve 12 (12) to sample the gas;
[0078] 5. Repeat steps 2-4 to complete the preset number of samplings (usually 3 times).
[0079] In actual measurements in sugarcane fields in Guangxi Zhuang Autonomous Region, the temperature difference recording error inside and outside the chamber 4 under this configuration was ≤0.5℃.
[0080] Technical benefits: The timer ensures precise control of the sampling time point (deviation ≤ 2 seconds), eliminating manual timing errors; the dual thermometer layout provides temperature gradient data inside and outside the chamber (measured gradient range 0.5-3.8℃ / m), providing a basis for gas concentration temperature correction.
[0081] In another technical solution, a horizontal plate 2 is provided at the bottom of the card slot, and the horizontal plate 2 is made of rubber material.
[0082] During assembly, countersunk screw holes (15 cm apart) are made on the bottom surface of the slot. A through hole is pre-drilled at the corresponding position of the horizontal plate 2. The plate is then fixed with M4 stainless steel countersunk screws (8 mm in length), with the screw head ≥0.5 mm below the rubber surface.
[0083] Technical effect: The horizontal plate 2 ensures that the bottom of the box 4 fits the plane of the base 1 with a degree of ≥95%, reducing gas leakage caused by uneven ground.
[0084] The specific method of using this utility model is as follows:
[0085] 1. Device installation and fixing
[0086] Select representative sampling points between sugarcane rows and clear surface debris to ensure the soil is level.
[0087] Place base 1 vertically on the ground, step on the fixing part and press down to make the bottom serrated structure fully penetrate the soil.
[0088] 2. Placement and sealing of box 4
[0089] Lift the main body 3, align the bottom opening of the box 4 with the slot of the base 1 and lower it vertically until the L-shaped edge (15 mm wide) of the box 4 is fully pressed against the rubber sealing strip of the slot (compression ≥ 1.5 mm).
[0090] Check the seams of the reflective heat insulation film (6 mm heat insulation cotton + 0.25 mm aluminum foil) covering the outer part of the box 4 to ensure they are intact and undamaged.
[0091] Move the two 180° rotatable handles 5 to the vertical position for easier handling later.
[0092] 3. Sampling System Preparation
[0093] Install the timer (accuracy ±1 second / day) at the top center of the enclosure 4, set the sampling interval (default 10 minutes) and start it.
[0094] Record the initial value T_outer0 of the thermometer (range -10~50℃) on the outside of chamber 4, and the initial value T_inner0 of the PT100 temperature sensor (accuracy ±0.3℃) suspended inside chamber 4.
[0095] Check the status of stopcock valve 8: Ensure that triangular regulating valve 12 is in the closed position (AB passage cut off, AC passage cut off).
[0096] 4. Gas sampling operation
[0097] When the timer beeps to indicate that the sampling time has been reached:
[0098] a. Record the current internal and external temperature values T 外1 T 内1 ;
[0099] b. Take a standard syringe (20 / 50 / 100 mL size) and vertically insert it into the plastic sampling port (ISO 594-1 Luer interface) at the top of the hexagonal screw 13, with an insertion depth of ≥7 mm until the O-ring seals (sealing force ≥0.3 MPa).
[0100] c. Rotate the triangular regulating valve 1290° to open the AB passage;
[0101] d. Extract gas samples at a constant rate;
[0102] e. Close the triangular regulating valve 12 and remove the syringe.
[0103] Inject the gas sample into the gas collection bag and label the time and corresponding temperature data.
[0104] Repeat the above steps to complete the preset number of samplings (usually 3 times, with an interval of 10 minutes).
[0105] 5. Equipment Recycling and Maintenance
[0106] After sampling, hold handle 5 with both hands and lift box 4 vertically to detach it from base 1.
[0107] Remove the soil attached to the base 1 fixing part.
[0108] Clean the reflective heat insulation film surface of the box body 4 and the threaded interfaces of the stopcock valve 8 with a soft cloth.
[0109] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.
Claims
1. A greenhouse gas collection device for sugarcane field soil, characterized in that, Includes the base and the main collection unit; The base has a square hollow structure, and includes a slot at the upper end and a fixing part at the lower end. The data acquisition body includes a rectangular hollow box with an open bottom and a data acquisition component. The bottom of the box is nested and engaged with a slot. The data acquisition component is disposed on the top of the box and includes: A plastic flexible tube, one end of which passes through the top of the collector body and connects to the inside of the box; A stopcock valve includes a valve body and a regulating valve. The valve body is a barrel-shaped structure with one open end. The valve body is provided with port A and port B. The regulating valve is rotatably inserted into the valve body from the open end to control the opening and closing of port A and port B. Port A is threadedly connected to a plastic hose, and port B is threadedly connected to a hexagonal knob. The center of the hexagonal knob has a hollow structure, and the free end of the hexagonal knob is provided with a plastic sampling port with a sealing ring.
2. The greenhouse gas collection device for sugarcane field soil according to claim 1, characterized in that, The long side of the fixing part is 30 cm to 35 cm, the wide side is 15 cm to 20 cm, and the height is 7 cm to 10 cm; The long side of the slot is 32 cm to 35 cm, the wide side is 20 cm to 25 cm, and the height is 3 cm to 5 cm. The main body of the sample has a long side dimension of 30 cm to 32 cm, a wide side dimension of 20 cm to 22 cm, and a height of 30 cm to 35 cm.
3. The greenhouse gas collection device for sugarcane field soil according to claim 1, characterized in that, The top of the box is symmetrically equipped with two handles that can rotate 180°.
4. The greenhouse gas collection device for sugarcane field soil according to claim 1, characterized in that, The outer surface of the box is covered with an external reflective heat insulation film.
5. The greenhouse gas collection device for sugarcane field soil according to claim 1, characterized in that, The reflective heat insulation film consists of a heat insulation cotton base layer and an aluminum foil outer layer, with the aluminum foil outer layer having a reflectivity of greater than 85%.
6. The greenhouse gas collection device for sugarcane field soil according to claim 5, characterized in that, The thickness of the insulation cotton base layer is 5 mm-8 mm, and the thickness of the aluminum foil outer layer is 0.1 mm-0.3 mm.
7. The greenhouse gas collection device for sugarcane field soil according to claim 1, characterized in that, The hexagonal screw-shaped plastic sampling port is compatible with the standard syringe interface.
8. The greenhouse gas collection device for sugarcane field soil according to claim 1, characterized in that, It also includes a timer and two thermometers, with the timer located on the top of the enclosure and the two thermometers located outside and inside the enclosure, respectively.
9. The greenhouse gas collection device for sugarcane field soil according to claim 1, characterized in that, A horizontal plate is provided at the bottom of the card slot, and the horizontal plate is made of stainless steel.