A sampling device for detecting greenhouse gas emissions during cow dung composting

Abstract

The invention discloses a sampling device for detecting greenhouse gas emissions during cow dung composting, and the invention relates to the field of gas sampling technology. The invention comprises a groove plate, the groove plate is fixedly connected to one end of a housing away from a sampling head, the surface of a sampling tube is slidably connected to the inner side of the groove plate, a driving component is fixedly connected to the outer side of the sampling tube, a side of the driving component away from the sampling tube is slidably connected to the outer side of the housing, the surface of a pressing component is fixedly connected to the inner side of the housing, the housing is always inserted into the cow dung, and sampling can be performed in real time during the heating, high temperature, cooling, and corrosion stages of cow dung composting, ensuring the detection of generated greenhouse gases, detecting the content of methane and nitrous oxide in greenhouse gases, thereby monitoring the fermentation situation during the composting process, and being able to adjust the composting conditions according to the composting situation.

Description

Technical Field

[0001] The invention relates to the technical field of gas sampling, and in particular to a sampling device for detecting greenhouse gas emissions in a cow dung composting process. Background Art

[0002] Greenhouse gas sampling of cow dung is an important operation to evaluate greenhouse gas emissions during cow dung composting or storage. Usually, special sampling equipment, such as static boxes or dynamic flux chambers, are used to collect gases on the surface of cow dung or around its stacking space. When collecting, attention should be paid to sealing to ensure that the samples taken can accurately reflect the actual concentration of greenhouse gases released by cow dung. For gases such as carbon dioxide, methane, and nitrous oxide, the gas content can be determined by gas chromatography and other analytical techniques after sampling to study the impact of cow dung treatment on the environment.

[0003] Most of the existing sampling equipment does not take samples from inside the cow dung, and cannot grasp the greenhouse gas emissions during the composting process in real time, nor can it know the gas emissions at each stage of composting. Therefore, we proposed a sampling equipment for detecting greenhouse gas emissions during cow dung composting. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a sampling device for detecting greenhouse gas emissions during cow dung composting, comprising:

[0005] A housing, wherein a sampling head is fixedly connected to the end of the housing, and the sampling head is configured in a cone shape;

[0006] A sampling mechanism, wherein the sampling mechanism is disposed inside the housing, and a surface of the sampling mechanism is slidably connected to an inner side surface of the housing;

[0007] Wherein, the sampling mechanism comprises:

[0008] A groove plate, the groove plate is fixedly connected to an end of the housing away from the sampling head;

[0009] A sampling tube having a sliding structure, which is used to extend a sampling head to sample the gas generated by the compost, and the surface of the sampling tube is slidably connected to the inner side of the groove plate;

[0010] A driving assembly, the driving assembly having a pressing structure, used for driving the sampling tube to extend out of the sampling head, the driving assembly being fixedly connected to the outer side of the sampling tube, and the side of the driving assembly away from the sampling tube being slidably connected to the outer side of the housing;

[0011] A pressing component, which has an elastic structure and is used to retract the sampling tube after sampling is completed, and the surface of the pressing component is fixedly connected to the inner side of the shell;

[0012] Insert one end of the shell with the sampling head fixed into the cow dung, move the driving component, and the driving component drives the sampling tube to move. The sampling tube passes through the sampling head and penetrates into the cow dung. The greenhouse gas generated by composting enters the sampling tube, and the greenhouse gas is extracted from the end of the sampling tube away from the sampling head for greenhouse gas emission detection. The shell is always inserted into the cow dung, and sampling can be performed in real time during the heating, high temperature, cooling, and corrosion stages of cow dung composting to ensure the detection of the generated greenhouse gases and the content of methane and nitrous oxide in the greenhouse gases, thereby monitoring the fermentation situation during the composting process and adjusting the composting conditions according to the composting situation.

[0013] Furthermore, an exhaust pipe is fixedly connected to the inner side of the sampling tube, and one end of the exhaust pipe away from the sampling head extends to the outside of the sampling tube, and the end of the exhaust pipe located outside the sampling tube is controlled by a valve. The exhaust pipe is connected to the pump body, and the other end of the pump body is connected to the sampling bag. The valve of the exhaust pipe is opened, and the greenhouse gas enters the sampling tube from the cow dung, passes through the exhaust pipe, and finally enters the sampling bag, completing the sampling of the greenhouse gas. The exhaust pipe is used to extract the greenhouse gas instead of directly extracting the greenhouse gas through the sampling tube, which can avoid the inhalation of juice in the cow dung during sampling and ensure the purity of the gas.

[0014] Furthermore, a plurality of sampling tubes are provided, and the plurality of sampling tubes are evenly distributed along the circumference of the groove plate, and the lengths of the sampling tubes are different, and the lengths of the plurality of sampling tubes increase evenly in a step-like manner. When the sampling tube is pressed, the end of the sampling tube away from the sampling head is finally flush with the groove plate. A plurality of sampling tubes are provided, and the lengths of the sampling tubes increase in a step-like manner, so that different depths of cow dung can be sampled, the entire manure pile can be sampled, and the fermentation condition of the entire manure pile can be monitored.

[0015] Furthermore, a filter plate is provided at one end of the sampling tube close to the sampling head, the surface of the filter plate is fixedly connected to the inner side of the sampling tube, and the filter holes of the filter plate are arranged in a narrow and long ellipse. The filter plate can filter cow dung so that only greenhouse gases can be inhaled by the sampling tube, and the narrow and long ellipse of the filter holes of the filter plate can block the cow dung to the greatest extent while ensuring the gas flow volume during inhalation. Several groups of filter plates are evenly arranged along the circumference of the sampling tube, and each group of filter plates has several filter plates evenly distributed along the axial direction of the sampling tube. Multiple filter plates are arranged to improve the inhalation effect of greenhouse gases.

[0016] Furthermore, a rubber sheet is fixedly connected to the inner side surface of the sampling head, and the rubber sheets are provided in several groups, each group of the rubber sheets corresponds to a sampling tube, and each group of the rubber sheets is provided with several rubber sheets, and the several rubber sheets together form a whole circle. When the sampling tube passes through the sampling head, it passes through the center of the circle formed by the several rubber sheets, and the sampling tube squeezes the rubber sheet, causing the rubber sheet to deform, and finally the sampling tube passes through the sampling head. The provision of the rubber sheet can prevent cow dung from entering the sampling head before the sampling tube is extended, thereby avoiding blockage. When the sampling tube is retracted, the surface of the sampling tube can be scratched to scrape off the cow dung on its surface, thereby preventing the cow dung from entering the interior of the sampling head.

[0017] Furthermore, the driving assembly includes a driving frame, the inner side surface of the driving frame is fixedly connected to the outer side surface of the sampling tube, and the driving frame is arranged on the side of the sampling tube away from the sampling head, and the side of the driving frame away from the sampling tube is fixedly connected with a ring plate, and the inner side surface of the ring plate is slidably connected to the outer side surface of the outer shell, and the driving frame is pressed to move, driving the sampling tube and the ring plate to move, and the ring plate slides on the outside of the outer shell at the same time, and finally the sampling tube is extended. When the sampling tube is retracted, the ring plate also slides on the outside of the outer shell, which can scrape off the cow dung on the outside of the outer shell to ensure the cleanliness of the outer shell surface.

[0018] Furthermore, a dovetail slider is fixedly connected to the inner side surface of the ring plate, a dovetail groove is provided on the outer side surface of the shell, and the surface of the dovetail slider is slidably connected to the inner side surface of the dovetail groove. The dovetail groove and the dovetail slider are provided to limit the movement of the drive frame, avoid uneven force on the drive frame due to manual pressing, avoid tilting of the sampling tube, and ensure the accuracy of the sampling position.

[0019] Furthermore, the pressing assembly includes a slide seat, the inner side surface of the slide seat is slidably connected to the inner side surface of the sampling tube, and the slide seat is symmetrically arranged at both ends of the shell, and the surface of the slide seat is fixedly connected to the inner side surface of the shell, the inner side surface of the slide seat is slidably connected to a limiting plate, the surface of the limiting plate is slidably connected to the inner side surface of the shell, and the side of the limiting plate away from the inner side surface of the shell is fixedly connected to the outer side surface of the sampling tube, the sampling tube moves, and the sampling tube slides inside the slide seat, and at the same time drives the limiting plate to slide inside the slide seat, and finally the sampling tube and the limiting plate both pass through the rubber plate, thereby limiting the movement of the sampling tube, thereby avoiding the sampling tube from tilting and ensuring the accuracy of the sampling position.

[0020] Furthermore, a limiting groove is provided on a side of the limiting plate away from the inner side surface of the shell, and a spring is provided on the outer sleeve of the sampling tube. The spring is fixedly connected to a side of the sliding seat away from the groove plate and close to the groove plate, and an end of the spring close to the groove plate is fixedly connected to a pressure plate, and the inner side surface of the pressure plate is fixedly connected to the outer side surface of the sampling tube. The movement of the sampling tube drives the pressure plate to move, thereby driving the spring to be compressed, providing a buffer for the movement of the sampling tube.

[0021] Furthermore, a bent rod is fixedly connected to a side of the slide away from the spring, and the bent rod is arranged on a side of the sampling tube away from the groove plate, a sphere is fixedly connected to one end of the bent rod away from the slide, and the surface of the sampling tube located on the inner side of the spring is configured as a waveform, and the sampling tube moves, and the sphere slides on the surface of the sampling tube, and when the sphere contacts the waveform surface of the sampling tube, the sphere hits the sampling tube, causing the sampling tube to vibrate continuously, and when the sampling tube is inserted into cow dung, the vibration causes the cow dung on the outside of the sampling tube to be discharged, making the insertion easier, and at the same time discharging the cavity created by the cow dung, which can facilitate the collection of gas and the sampling of greenhouse gases, and after the insertion is completed, the sphere is stuck in the waveform depression of the sampling tube, which can prevent the sampling tube from retracting, maintain a long insertion time, and ensure real-time sampling.

[0022] The present invention has the beneficial effects:

[0023] The present invention provides a sampling mechanism, and the outer shell is always inserted into the cow dung. In the heating, high temperature, cooling and corrosion stages of cow dung composting, sampling can be performed in real time to ensure the detection of generated greenhouse gases, and the contents of methane and nitrous oxide in the greenhouse gases are detected, so as to monitor the fermentation situation in the composting process, adjust the composting conditions according to the composting situation, and use an exhaust pipe to extract the greenhouse gases instead of directly extracting the greenhouse gases through the sampling tube, so as to avoid sucking in juice in the cow dung during sampling, and ensure the purity of the gas. A plurality of sampling tubes are provided, and the lengths of the sampling tubes are increased in a step-by-step manner, so that sampling can be performed at different depths of the cow dung, so as to achieve sampling of the entire compost pile, and monitor the fermentation situation of the entire compost pile.

[0024] The present invention provides a filter plate that can filter cow dung so that only greenhouse gases can be sucked into the sampling tube. The filter holes of the filter plate are arranged in a narrow and long elliptical shape, which can block the cow dung to the greatest extent while ensuring the gas flow volume during inhalation. Multiple filter plates can improve the inhalation effect of greenhouse gases.

[0025] The present invention sets a driving component. When the sampling tube retracts, the ring plate also slides on the outside of the shell, which can scrape off the cow dung on the outside of the shell and ensure the cleanliness of the shell surface. The dovetail groove and the dovetail slider limit the movement of the driving frame to avoid uneven force on the driving frame due to manual pressing, avoid tilting of the sampling tube, and ensure the accuracy of the sampling position.

[0026] The present invention provides a pressing component. When the ball contacts the corrugated surface of the sampling tube, the ball impacts the sampling tube, causing the sampling tube to vibrate continuously. When the sampling tube is inserted into cow dung, the vibration causes the cow dung on the outside of the sampling tube to be displaced, making the insertion easier. At the same time, the cavity created by the cow dung is displaced, which can facilitate the collection of gas and the sampling of greenhouse gases. After the insertion is completed, the ball is stuck in the corrugated depression of the sampling tube, which can prevent the sampling tube from retracting, maintain the insertion for a long time, and ensure real-time sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a sampling device for detecting greenhouse gas emissions during cow dung composting of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the sampling mechanism of the present invention;

[0029] Figure 3 This is a schematic diagram of the internal structure of the housing of the present invention;

[0030] Figure 4 It is a schematic diagram of the filter plate structure of the present invention;

[0031] Figure 5 For the present invention Figure 2 A magnified view of part A;

[0032] Figure 6 This is a schematic diagram of the sampling tube structure of the present invention;

[0033] Figure 7 It is a cross-sectional schematic diagram of the housing of the present invention;

[0034] Figure 8 It is a schematic diagram of the structure of the pressing assembly of the present invention.

[0035] In the figure: 1, housing; 2, sampling head; 3, sampling mechanism; 31, groove plate; 32, driving assembly; 321, driving frame; 322, ring plate; 323, dovetail slider; 324, dovetail groove; 33, sampling tube; 34, suction tube; 35, pressing assembly; 351, slide seat; 352, limit plate; 353, spring; 354, pressure plate; 355, limit groove; 356, bent rod; 357, sphere; 36, filter plate; 37, rubber plate. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0037] Example 1, please refer to Figure 1-Figure 5 The present invention is a sampling device for detecting greenhouse gas emissions during cow dung composting, comprising:

[0038] A housing 1, an end of which is fixedly connected to a sampling head 2, which is arranged in a cone shape;

[0039] The sampling mechanism 3 is arranged inside the housing 1, and the surface of the sampling mechanism 3 is slidably connected to the inner side surface of the housing 1;

[0040] Wherein, the sampling mechanism 3 comprises:

[0041] A groove plate 31, the groove plate 31 is fixedly connected to an end of the housing 1 away from the sampling head 2;

[0042] A sampling tube 33 having a sliding structure, which is used to extend the sampling head 2 to sample the gas generated by the compost, and the surface of the sampling tube 33 is slidably connected to the inner side surface of the groove plate 31;

[0043] A driving assembly 32, wherein the driving assembly 32 has a pressing structure and is used to drive the sampling tube 33 to extend out of the sampling head 2, the driving assembly 32 is fixedly connected to the outer side of the sampling tube 33, and a side of the driving assembly 32 away from the sampling tube 33 is slidably connected to the outer side of the housing 1;

[0044] A pressing component 35, which has an elastic structure and is used to retract the sampling tube 33 after sampling. The surface of the pressing component 35 is fixedly connected to the inner side of the housing 1;

[0045] Insert one end of the shell 1 fixed with the sampling head 2 into the cow dung, move the driving component 32, and the driving component 32 drives the sampling tube 33 to move. The sampling tube 33 passes through the sampling head 2 and penetrates into the cow dung. The greenhouse gas generated by composting enters the sampling tube 33, and the greenhouse gas is extracted from the end of the sampling tube 33 away from the sampling head 2 for greenhouse gas emission detection. The shell 1 is always inserted into the cow dung, and sampling can be performed in real time during the heating, high temperature, cooling, and corrosion stages of cow dung composting to ensure the detection of the generated greenhouse gases and the content of methane and nitrous oxide in the greenhouse gases, so as to monitor the fermentation situation during the composting process and adjust the composting conditions according to the composting situation.

[0046] An exhaust pipe 34 is fixedly connected to the inner side of the sampling tube 33. The end of the exhaust pipe 34 away from the sampling head 2 extends to the outside of the sampling tube 33, and the end of the exhaust pipe 34 located outside the sampling tube 33 is controlled by a valve. The exhaust pipe 34 is connected to the pump body, and the other end of the pump body is connected to the sampling bag. The valve of the exhaust pipe 34 is opened, and the greenhouse gas enters the sampling tube 33 from the cow dung, passes through the exhaust pipe 34, and finally enters the sampling bag, completing the sampling of the greenhouse gas. The exhaust pipe 34 is used to extract the greenhouse gas instead of directly extracting the greenhouse gas through the sampling tube 33, which can avoid the inhalation of juice in the cow dung during sampling and ensure the purity of the gas.

[0047] A plurality of sampling tubes 33 are provided, and the plurality of sampling tubes 33 are evenly distributed along the circumference of the groove plate 31, and the lengths of the sampling tubes 33 are different, and the lengths of the plurality of sampling tubes 33 increase evenly in a step-like manner. When the sampling tube 33 is pressed, the end of the sampling tube 33 away from the sampling head 2 is finally flush with the groove plate 31. A plurality of sampling tubes 33 are provided, and the lengths of the sampling tubes 33 increase in a step-like manner, so that different depths of cow dung can be sampled, the entire manure pile can be sampled, and the fermentation condition of the entire manure pile can be monitored.

[0048] A filter plate 36 is provided at one end of the sampling tube 33 close to the sampling head 2. The surface of the filter plate 36 is fixedly connected to the inner side of the sampling tube 33, and the filter holes of the filter plate 36 are set to be narrow and long elliptical. The filter plate 36 can filter cow dung so that only greenhouse gases can be inhaled by the sampling tube 33. The narrow and long elliptical filter holes of the filter plate 36 can block the cow dung to the greatest extent while ensuring the gas flow volume during inhalation. Several groups of filter plates 36 are evenly arranged along the circumference of the sampling tube 33, and each group of filter plates 36 is evenly distributed along the axial direction of the sampling tube 33. Multiple filter plates 36 are set to improve the inhalation effect of greenhouse gases.

[0049] The inner side of the sampling head 2 is fixedly connected with a rubber sheet 37, and the rubber sheets 37 are provided with several groups. Each group of rubber sheets 37 corresponds to a sampling tube 33. Each group of rubber sheets 37 is provided with several rubber sheets, and several rubber sheets 37 together form a whole circle. When the sampling tube 33 passes through the sampling head 2, it passes through the center of the circle formed by the several rubber sheets 37. The sampling tube 33 squeezes the rubber sheet 37, and the rubber sheet 37 is deformed. Finally, the sampling tube 33 passes through the sampling head 2. The rubber sheet 37 can prevent cow dung from entering the sampling head 2 before the sampling tube 33 is extended, thereby avoiding blockage. When the sampling tube 33 is retracted, the surface of the sampling tube 33 can be scratched to scrape off the cow dung on its surface to prevent cow dung from entering the inside of the sampling head 2.

[0050] Example 2, please refer to Figure 1-Figure 8 The driving assembly 32 includes a driving frame 321, the inner side surface of the driving frame 321 is fixedly connected to the outer side surface of the sampling tube 33, and the driving frame 321 is arranged on the side of the sampling tube 33 away from the sampling head 2, and the side of the driving frame 321 away from the sampling tube 33 is fixedly connected with a ring plate 322, and the inner side surface of the ring plate 322 is slidably connected to the outer side surface of the shell 1. The driving frame 321 is pressed, and the driving frame 321 moves, driving the sampling tube 33 and the ring plate 322 to move. At the same time, the ring plate 322 slides on the outside of the shell 1, and finally the sampling tube 33 is extended. When the sampling tube 33 is retracted, the ring plate 322 also slides on the outside of the shell 1, which can scrape off the cow dung on the outside of the shell 1 to ensure the cleanliness of the surface of the shell 1.

[0051] A dovetail slider 323 is fixedly connected to the inner side of the ring plate 322, a dovetail groove 324 is provided on the outer side of the shell 1, and the surface of the dovetail slider 323 is slidably connected to the inner side of the dovetail groove 324. The dovetail groove 324 and the dovetail slider 323 are provided to limit the movement of the drive frame 321 to prevent the drive frame 321 from being subjected to uneven force due to manual pressing, to avoid tilting of the sampling tube 33, and to ensure the accuracy of the sampling position.

[0052] The pressing assembly 35 includes a slide seat 351, the inner side surface of the slide seat 351 is slidably connected to the inner side surface of the sampling tube 33, and the slide seat 351 is symmetrically arranged at both ends of the shell 1, and the surface of the slide seat 351 is fixedly connected to the inner side surface of the shell 1, the inner side surface of the slide seat 351 is slidably connected to the limiting plate 352, the surface of the limiting plate 352 is slidably connected to the inner side surface of the shell 1, and the side of the limiting plate 352 away from the inner side surface of the shell 1 is fixedly connected to the outer side surface of the sampling tube 33, the sampling tube 33 moves, and the sampling tube 33 slides inside the slide seat 351, and at the same time drives the limiting plate 352 to slide inside the slide seat 351, and finally the sampling tube 33 and the limiting plate 352 both pass through the rubber plate 37, thereby limiting the movement of the sampling tube 33, thereby preventing the sampling tube 33 from tilting and ensuring the accuracy of the sampling position.

[0053] A limiting groove 355 is provided on the side of the limiting plate 352 away from the inner side of the shell 1, and a spring 353 is provided on the outer sleeve of the sampling tube 33. The spring 353 is fixedly connected to the side of the slide seat 351 away from the groove plate 31 and close to the groove plate 31, and the end of the spring 353 close to the groove plate 31 is fixedly connected to a pressing plate 354, and the inner side surface of the pressing plate 354 is fixedly connected to the outer side surface of the sampling tube 33. The movement of the sampling tube 33 drives the pressing plate 354 to move, thereby driving the spring 353 to be compressed, providing a buffer for the movement of the sampling tube 33.

[0054] A bent rod 356 is fixedly connected to the side of the slide 351 away from the spring 353, and the bent rod 356 is arranged on the side of the sampling tube 33 away from the groove plate 31. A ball 357 is fixedly connected to the end of the bent rod 356 away from the slide 351, and the surface of the sampling tube 33 located on the inner side of the spring 353 is set to be corrugated. When the sampling tube 33 moves, the ball 357 slides on the surface of the sampling tube 33. When the ball 357 contacts the corrugated surface of the sampling tube 33, the ball 357 hits the sampling tube 33, so that the sampling tube 33 continuously vibrates. When the sampling tube 33 is inserted into cow dung, the vibration causes the cow dung on the outside of the sampling tube 33 to be discharged, making the insertion easier. At the same time, discharging the cavity generated by the cow dung can facilitate the collection of gas and the sampling of greenhouse gases. After the insertion is completed, the ball 357 is stuck in the corrugated depression of the sampling tube 33, which can prevent the sampling tube 33 from retracting, maintain a long insertion, and ensure real-time sampling.

[0055] When in use, the driving frame 321 is pressed, and the driving frame 321 moves, driving the sampling tube 33 and the ring plate 322 to move. At the same time, the ring plate 322 slides on the outside of the shell 1, and the sampling tube 33 slides inside the slide seat 351, and at the same time drives the limit plate 352 to slide inside the slide seat 351. The sampling tube 33 moves, driving the pressing plate 354 to move, thereby driving the spring 353 to compress, providing a buffer for the movement of the sampling tube 33, and the ball 357 slides on the surface of the sampling tube 33. When the ball 357 contacts the corrugated surface of the sampling tube 33, the ball 357 The sampling tube 33 is hit so that the sampling tube 33 continuously vibrates, and the vibration causes the cow dung on the outside of the sampling tube 33 to be discharged. Finally, the sampling tube 33 and the limit plate 352 pass through the rubber plate 37, and the sampling tube 33 extends out of the sampling head 2. The end of the sampling tube 33 away from the sampling head 2 is finally flush with the groove plate 31. The exhaust pipe 34 is connected to the pump body, and the other end of the pump body is connected to the sampling bag. The valve of the exhaust pipe 34 is opened, and the greenhouse gas enters the sampling tube 33 from the cow dung, passes through the exhaust pipe 34, and finally enters the sampling bag, completing the sampling of the greenhouse gas.

[0056] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A sampling device for detecting greenhouse gas emissions during cow dung composting, characterized in that: include: A housing (1), wherein a sampling head (2) is fixedly connected to an end of the housing (1), and the sampling head (2) is configured in a cone shape; A sampling mechanism (3), the sampling mechanism (3) being arranged inside the outer shell (1), and the surface of the sampling mechanism (3) being slidably connected to the inner side surface of the outer shell (1); Wherein, the sampling mechanism (3) comprises: A groove plate (31), wherein the groove plate (31) is fixedly connected to an end of the housing (1) away from the sampling head (2); A sampling tube (33) having a sliding structure and used to extend the sampling head (2) to sample the gas generated by the compost, wherein the surface of the sampling tube (33) is slidably connected to the inner side surface of the groove plate (31); A driving assembly (32), the driving assembly (32) having a pressing structure, used for driving the sampling tube (33) to extend out of the sampling head (2), the driving assembly (32) being fixedly connected to the outer side surface of the sampling tube (33), and the side of the driving assembly (32) away from the sampling tube (33) being slidably connected to the outer side surface of the housing (1); A pressing component (35), the pressing component (35) having an elastic structure, used for retracting the sampling tube (33) after sampling is completed, the surface of the pressing component (35) being fixedly connected to the inner side surface of the housing (1); An exhaust pipe (34) is fixedly connected to the inner side of the sampling tube (33); one end of the exhaust pipe (34) away from the sampling head (2) extends to the outside of the sampling tube (33); and one end of the exhaust pipe (34) located outside the sampling tube (33) is controlled by a valve; A plurality of the sampling tubes (33) are provided, and the plurality of the sampling tubes (33) are evenly distributed along the circumference of the groove plate (31), and the lengths of the sampling tubes (33) are different, and the lengths of the plurality of the sampling tubes (33) increase evenly in a step-like manner; A filter plate (36) is arranged at one end of the sampling tube (33) close to the sampling head (2); the surface of the filter plate (36) is fixedly connected to the inner side surface of the sampling tube (33); the filter holes of the filter plate (36) are arranged in a narrow and long elliptical shape; a plurality of groups of filter plates (36) are evenly arranged along the circumference of the sampling tube (33); each group of filter plates (36) has a plurality of filter plates evenly distributed along the axial direction of the sampling tube (33); The inner side surface of the sampling head (2) is fixedly connected with a rubber plate (37), and the rubber plates (37) are provided in a plurality of groups, each group of the rubber plates (37) corresponds to a sampling tube (33), and each group of the rubber plates (37) is provided with a plurality of rubber plates, and the plurality of rubber plates (37) together form a complete circle.

2. The sampling device for detecting greenhouse gas emissions during cow dung composting according to claim 1, characterized in that: The driving assembly (32) comprises a driving frame (321), the inner side surface of the driving frame (321) being fixedly connected to the outer side surface of the sampling tube (33), and the driving frame (321) being arranged on a side of the sampling tube (33) away from the sampling head (2), and a ring plate (322) being fixedly connected to the side of the driving frame (321) away from the sampling tube (33), and the inner side surface of the ring plate (322) being slidably connected to the outer side surface of the housing (1).

3. The sampling device for detecting greenhouse gas emissions during cow dung composting according to claim 2, characterized in that: A dovetail slider (323) is fixedly connected to the inner side surface of the ring plate (322), a dovetail groove (324) is provided on the outer side surface of the housing (1), and the surface of the dovetail slider (323) is slidably connected to the inner side surface of the dovetail groove (324).

4. The sampling device for detecting greenhouse gas emissions during cow dung composting according to claim 3, characterized in that: The pressing assembly (35) comprises a sliding seat (351), the inner side surface of the sliding seat (351) being slidably connected to the inner side surface of the sampling tube (33), the sliding seat (351) being symmetrically arranged at both ends of the outer shell (1), and the surface of the sliding seat (351) being fixedly connected to the inner side surface of the outer shell (1), the inner side surface of the sliding seat (351) being slidably connected to a limiting plate (352), the surface of the limiting plate (352) being slidably connected to the inner side surface of the outer shell (1), and the side of the limiting plate (352) away from the inner side surface of the outer shell (1) being fixedly connected to the outer side surface of the sampling tube (33).

5. The sampling device for detecting greenhouse gas emissions during cow dung composting according to claim 4, characterized in that: A limiting groove (355) is provided on a side of the limiting plate (352) away from the inner side of the housing (1); a spring (353) is sleeved on the outside of the sampling tube (33); the spring (353) is fixedly connected to a side of the slide seat (351) away from the groove plate (31) and close to the groove plate (31); and a pressing plate (354) is fixedly connected to one end of the spring (353) close to the groove plate (31); and the inner side of the pressing plate (354) is fixedly connected to the outer side of the sampling tube (33).

6. The sampling device for detecting greenhouse gas emissions during cow dung composting according to claim 5, characterized in that: A bent rod (356) is fixedly connected to a side of the slide seat (351) away from the spring (353), and the bent rod (356) is arranged on a side of the sampling tube (33) away from the groove plate (31), and a sphere (357) is fixedly connected to one end of the bent rod (356) away from the slide seat (351), and a surface of the sampling tube (33) located on the inner side of the spring (353) is arranged to be corrugated.

Images