A gas detection device for a greenhouse

Abstract

The application discloses a greenhouse gas detection device and belongs to the technical field of gas sampling, which comprises an outer supporting ring, a plurality of float mechanisms are arranged around the inner part of the outer supporting ring along an axis, an inner supporting ring is connected to the inner side of the float mechanism, a static tank is connected to the top of the inner supporting ring, a sample tank is installed on the top of the static tank, and a sampling machine main body is installed in the static tank. In the application, the plurality of air inlets are designed, when the static tank floats on the top of the water body, the gas environment in the static tank can be reset by controlling the opening of the air inlets, the water body greenhouse gas can be waited for to be generated again and sampled after the gas environment in the static tank is reset, the accuracy of interval sampling of the water body greenhouse gas is improved, and the influence of the non-emission of the gas in the traditional static tank on the sampling accuracy is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas sampling, and particularly relates to a greenhouse gas detection device. BACKGROUND

[0002] Water surface greenhouse gases mainly refer to carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) discharged from water bodies such as lakes, rivers, wetlands, reservoirs and oceans. These gases are mainly released into the atmosphere through biogeochemical processes (such as organic matter decomposition and microbial activity) and physical processes (such as water body disturbance and temperature change) in the water body.

[0003] A water surface greenhouse gas automatic sampling static box disclosed in Chinese patent CN105738161B is composed of a static box, an automatic sampling device, a power supply system and a control system. The static box is externally fixed with a float, the inner side of the box body is provided with a fan, the top is provided with an opening and connected with a needle-shaped gas sampling port. The main part of the automatic sampling device is disc-shaped and can rotate freely. The vacuum gas sampling bag can be placed around the disc, the center of the bag opening is aligned with the horizontal needle-shaped gas sample outlet and can reciprocate in the horizontal sliding groove. The power supply system is composed of a solar panel and a storage battery. The solar panel is fixed on the outer side of the static box, and the two storage batteries are fixed in the static box. The control system controls the automatic sampling device and stores environmental information. The temperature probe and the barograph are connected with the control system. The application can be used for automatic, continuous and long-term collection of water surface greenhouse gases, and can synchronously collect environmental information, and can meet the needs of collecting greenhouse gases on different water surfaces. However, in actual use, the gas on the water surface is automatically enriched in the static box. When the static box changes the sampling point along with the water surface, the static box enriched with greenhouse gases cannot well reflect the value of the water surface greenhouse gas after transfer, and there is room for improvement. SUMMARY

[0004] The purpose of the application is to solve the problem that the static box enriched with greenhouse gases cannot well reflect the value of the water surface greenhouse gas after transfer when the static box changes the sampling point along with the water surface, and a greenhouse gas detection device is provided.

[0005] In order to achieve the above purpose, the application adopts the following technical scheme:

[0006] A greenhouse gas detection device comprises an outer support ring, a plurality of float mechanisms are arranged around the inner part of the outer support ring along an axis, an inner support ring is connected to the inner side of the float mechanism, a static box is connected to the top of the inner support ring, a sample box is installed on the top of the static box, a sampling machine main body is installed in the static box, and the sampling machine main body is used to extract greenhouse gas in the sample box into the sample box.

[0007] The static box is provided with a plurality of air inlets on the periphery of the outer side, and the air inlets are provided with openable and closable ventilation components, one side of the ventilation component is provided with a driving mechanism connected to the static box, the opening and closing of the ventilation component in the air inlet is controlled by the driving mechanism, and one side of the driving mechanism is drivingly connected with a control mechanism, the sample box is provided with a rotatable air charging head which can be lifted and lowered, the control mechanism extends into the sample box and controls the lifting and lowering of the rotatable air charging head, the lifting and lowering of the rotatable air charging head is controlled by the opening and closing of the air inlet, so as to control the sampling gas concentration in the static box.

[0008] As a further description of the above technical solution:

[0009] The floating body mechanism comprises a floating capsule, an energy-absorbing ring block is arranged on the inner side of the floating capsule, the inner side of the energy-absorbing ring block is connected to the outer side of the inner supporting ring through a universal joint, fixed blocks are connected to the two sides of the floating capsule corresponding to the energy-absorbing ring block and the outer supporting ring, a hinge block is connected to one side of the fixed block, a hinge seat is rotatably connected to the outside of the hinge block, the hinge seat on one side of the energy-absorbing ring block is connected to one side of the energy-absorbing ring block, and a guide rod is connected to the hinge seat on one side of the outer supporting ring, the guide rod is slidingly connected to the guide hole formed in the side wall of the outer supporting ring, a first spring is arranged on the outer side of the guide rod, and the two ends of the first spring are respectively connected to the corresponding positions of the end of the guide rod and the outer side of the outer supporting ring. The hinge seat and the hinge block on the two sides of the floating capsule form a rotary pair buffer energy-absorbing.

[0010] As a further description of the above technical solution:

[0011] A plurality of energy-absorbing ring blocks are connected to the first fixed plate and the second fixed plate on the two sides, a sleeve is connected to one side of the first fixed plate, a plurality of elastic blocks are arranged in the inner cavity of the sleeve along the axis, a pressing block is slidingly connected in the inner cavity of the sleeve, and the pressing block is connected to one side of the second fixed plate through a rod. The elastic blocks are pressed by moving the pressing block through the rod to absorb the shaking of the energy-absorbing ring blocks on the two sides.

[0012] As a further description of the above technical solution:

[0013] The diameter of the sleeve is smaller than the diameter of the inner wall of the sleeve, and the sleeve is limited in the sleeve by the elastic blocks. The second fixed plate moves the pressing block and the rod in the sleeve to press the elastic blocks to absorb energy and buffer.

[0014] As a further description of the above technical solution:

[0015] The ventilation component comprises a plurality of gate plates arranged in the air inlet, a first rotating block is connected to the bottom of one side of the gate plate, a second rotating block is rotatably connected to the bottom of the first rotating block, a driving ring is connected between a plurality of second rotating blocks, and the driving ring is drivingly connected to one side of the driving mechanism. The driving mechanism drives the driving ring to rotate to pull the gate plate to move in the air inlet.

[0016] As a further description of the above technical solution:

[0017] The guide rod is sleeved with a guide sleeve, the air inlet is internally provided with a containing groove for sliding the gate plate, the guide rod extends to the bottom of the containing groove and is internally provided with a stroke groove corresponding to the side of the guide rod, the guide sleeve is connected in the stroke groove, and the guide rod is externally provided with a second spring, and the two ends of the second spring are connected with the guide sleeve and the side of the first rotating block corresponding position respectively.

[0018] As a further description of the above technical solution:

[0019] The driving mechanism comprises a connecting rod rotationally connected to the bottom of the driving ring, and a push block rotationally connected to the other end of the connecting rod, and an electric push rod connected to the side of the inner cavity of the static box.

[0020] As a further description of the above technical solution:

[0021] The control mechanism comprises a fixed ring and a rotating ring, the rotating ring is connected to the inner side of the driving ring through a connecting plate, the fixed ring is connected to the bottom of the inner cavity of the static box, a plurality of sliding holes are arranged around the top of the fixed ring, a lifting rod is slidably connected in the sliding hole, the bottom end of the lifting rod is in contact with a wedge block arranged at the corresponding position of the top of the rotating ring, the wedge block is pressed to extrude the lifting rod by rotating the driving ring, a connecting rod is connected to the top end of the lifting rod, a third spring is sleeved on the lifting rod, and the two ends of the third spring are connected with the fixed ring and the side of the connecting rod corresponding position respectively, a top rod is connected to the other end of the connecting rod, and the top rod penetrates through the static box and the sample box and is connected to the bottom side of the rotary inflation head.

[0022] As a further description of the above technical solution:

[0023] A plurality of vacuum air storage bags are arranged equidistantly along the axis in the inner cavity of the sample box, and the air injection port of the vacuum air storage bag is located on the radial side of the rotary stroke of the rotary inflation head.

[0024] As a further description of the above technical solution:

[0025] The cross section of the wedge block is triangular, and the inclined surface of the top of the wedge block is matched with the bottom of the lifting rod.

[0026] As described above, due to the adoption of the above technical solution, the beneficial effects of the present application are:

[0027] 1、In the present application, by designing a plurality of air inlets, when the static box floats on the top of the water body, the gas environment in the static box can be reset by controlling the opening of the air inlet, which facilitates the waiting for the water body greenhouse gas to be generated again and sampling after the gas environment in the static box is reset, improves the accuracy of interval sampling of water body greenhouse gas, and avoids the influence of traditional static box gas on sampling accuracy.

[0028] 2、The invention, by designing the floating body mechanism, when the floating capsule floats on the water surface, the water body fluctuates, the floating capsule can absorb part of the water body fluctuation, at the same time, the floating capsule can offset the energy consumption by rotating around the axis of the hinge seat through the hinge block on both sides, when the swing increases, the floating capsule can pull the guide rod on one side to slide in the outer support ring guide hole, the guide rod movement can extrude the outer first spring, the first spring can absorb the water body swing by using its own elastic force, improve the floating stability of the internal inner support ring and the static box, avoid the separation of the static box and the water surface due to the water body swing, affect the enrichment effect of greenhouse gas;

[0029] 3、The invention, by designing the ventilation assembly, the push block can be moved by the electric push rod working extension, the drive ring can be rotated by the connecting rod pushing, the second rotating block and the first rotating block can be moved by the drive ring rotation, the shutter can be moved in the air inlet by the first rotating block movement, so that the air inlet can be opened or closed according to the need, through the opening and closing control of the air inlet, the gas concentration in the static box can be adjusted when the water surface greenhouse gas is treated, the subsequent sampling treatment by the sampling machine main body is facilitated, and the control of the gas environment in the static box is improved, and the sampling precision is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The overall structure schematic diagram of the greenhouse gas detection device is provided for the invention;

[0031] Figure 2 The structure schematic diagram of the A part in the invention is enlarged; Figure 1

[0032] Figure 3 The split structure schematic diagram of the greenhouse gas detection device is provided for the invention;

[0033] Figure 4 The floating body mechanism part split structure schematic diagram of the greenhouse gas detection device is provided for the invention;

[0034] Figure 5 The lateral structure schematic diagram of the greenhouse gas detection device is provided for the invention;

[0035] Figure 6 The sleeve assembly structure schematic diagram of the greenhouse gas detection device is provided for the invention;

[0036] Figure 7 The ventilation assembly split structure schematic diagram of the greenhouse gas detection device is provided for the invention;

[0037] Figure 8 The ventilation assembly assembly structure schematic diagram of the greenhouse gas detection device is provided for the invention;

[0038] ​Figure 9 A static box bottom structure schematic diagram of a greenhouse gas detection device provided by the present application is shown in the figure.

[0039] Figure 10 A structure schematic diagram of the B part in the figure is provided by the present application. Figure 9 A structure schematic diagram of the B part in the figure is provided by the present application.

[0040] Legend:

[0041] 1, outer support ring; 2, inner support ring; 3, floating body mechanism; 301, floating capsule; 302, guide rod; 303, first spring; 304, hinged seat; 305, hinged block; 306, fixed block; 307, universal joint; 308, first fixed plate; 309, second fixed plate; 310, energy absorption ring block; 311, ferrule; 312, elastic block; 313, pressing block; 4, static box; 5, sampling machine main body; 6, ventilation assembly; 601, gate plate; 602, first rotating block; 603, second rotating block; 604, driving ring; 605, guide rod; 606, second spring; 607, guide sleeve; 7, driving mechanism; 701, electric push rod; 702, push block; 703, connecting rod; 8, control mechanism; 801, fixed ring; 802, connecting rod; 803, ejector rod; 804, lifting rod; 805, rotating ring; 806, wedge block; 807, connecting plate; 9, vacuum gas storage bag; 10, rotary inflation head; 11, bottom plate; 12, sample box. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] Please refer to Figures 1-10 The present application provides a technical solution: a greenhouse gas detection device, comprising an outer support ring 1, a plurality of floating body mechanisms 3 are arranged inside the outer support ring 1 along the axis, and an inner support ring 2 is connected to the inner side of the floating body mechanism 3, a static box 4 is connected to the top of the inner support ring 2, a sample box 12 is installed on the top of the static box 4, a sampling machine main body 5 is installed in the static box 4, and the greenhouse gas in the sample box 12 is extracted to the sample box 12 by the sampling machine main body 5.

[0044] The static box 4 is provided with a plurality of air inlets on the outer periphery, and the air inlets are provided with openable and closable ventilation assemblies 6, one side of the ventilation assembly 6 is provided with a driving mechanism 7 connected to the static box 4, the opening and closing of the ventilation assembly 6 in the air inlet is controlled by the driving mechanism 7, and one side of the driving mechanism 7 is drivingly connected with a control mechanism 8, the sample box 12 is connected with a rotatable air charging head 10 which can be lifted, the control mechanism 8 extends into the sample box 12 and controls the lifting of the rotatable air charging head 10, and the lifting of the rotatable air charging head 10 is controlled by the opening and closing of the air inlet, so as to control the sampling gas concentration in the static box 4.

[0045] Specifically, through the design of a plurality of air inlets, when the static box 4 floats on the top of the water body, the gas environment in the static box 4 can be reset by controlling the opening of the air inlet, which facilitates the waiting for the water body greenhouse gas to be generated again and sampling after the gas environment in the static box 4 is reset, improves the accuracy of interval sampling of water body greenhouse gas, and avoids the influence of traditional static box 4 gas not being emitted on the sampling accuracy.

[0046] Please refer to Figures 1-6 The floating body mechanism 3 includes a floating capsule 301, the inside of the floating capsule 301 is provided with an energy-absorbing ring block 310, the inside of the energy-absorbing ring block 310 is connected to the outside of the inner supporting ring 2 through a universal joint 307, the floating capsule 301 is connected with a fixed block 306 on both sides corresponding to the energy-absorbing ring block 310 and the outer supporting ring 1, one side of the fixed block 306 is connected with a hinged block 305, the hinged block 305 is rotatably connected with a hinged seat 304, one side of the hinged seat 304 corresponding to the energy-absorbing ring block 310 is connected to one side of the energy-absorbing ring block 310, and one side of the hinged seat 304 corresponding to the outer supporting ring 1 is connected with a guide rod 302, the guide rod 302 is slidingly connected in the guide hole formed in the side wall of the outer supporting ring 1, and the guide rod 302 is provided with a first spring 303, and the two ends of the first spring 303 are respectively connected with the end of the guide rod 302 and the corresponding position on one side of the outer supporting ring 1, and the hinged seat 304 and the hinged block 305 on both sides of the floating capsule 301 form a rotary pair buffer energy-absorbing;

[0047] A plurality of energy-absorbing ring blocks 310 are connected with a first fixed plate 308 and a second fixed plate 309 on both sides, one side of the first fixed plate 308 is connected with a sleeve 311, a plurality of elastic blocks 312 are arranged in the inner cavity of the sleeve 311 along the axis, a pressing block 313 is slidingly connected in the inner cavity of the sleeve 311, one side of the pressing block 313 is connected with one side of the second fixed plate 309 through a rod body, and the rod body moves to press the elastic blocks 312 to absorb the shaking of the energy-absorbing ring blocks 310 on both sides;

[0048] The diameter of the sleeve 311 is smaller than the diameter of the inner wall of the sleeve 311, and the sleeve 311 is limited in the sleeve 311 by the elastic blocks 312, and the second fixed plate 309 moves in the sleeve 311 through the rod body and the pressing block 313 to extrude the elastic blocks 312 to absorb energy and buffer;

[0049] Specifically, when the floating body mechanism 3 is designed, when the water body fluctuates when the floating bag 301 floats on the water surface, the floating bag 301 can absorb part of the water body fluctuation, and at the same time, the floating bag 301 can offset the energy consumption by rotating around the axis of the hinge seat 304 through the two side hinge blocks 305, when the fluctuation increases, the floating bag 301 can pull one side of the guide rod 302 to slide in the guide hole of the outer support ring 1, the movement of the guide rod 302 can press the outer first spring 303, and the first spring 303 can absorb the water body fluctuation by using the elastic force of itself, so as to improve the floating stability of the inner support ring 2 and the static tank 4, and avoid the separation of the static tank 4 from the water surface due to the water body fluctuation, which affects the enrichment effect of greenhouse gas.

[0050] Further, by designing the energy absorption ring block 310, a plurality of energy absorption ring blocks 310 can be independently connected with the floating bag 301, and when the single floating bag 301 fluctuates, the energy absorption ring block 310 can pull the pressing block 313 to slide in the sleeve 311, and the rod body on one side of the pressing block 313 can absorb the fluctuation by pressing the elastic block 312, so as to avoid the vibration interference between the plurality of energy absorption ring blocks 310, realize the separate energy consumption of water body fluctuation in different directions, and be beneficial to improve the staying stability of the static tank 4 in complex water flow environment.

[0051] By setting the universal joint 307 between the energy absorption ring block 310 and the inner support ring 2, the vibration conduction of the energy absorption ring block 310 to the inner support ring 2 can be further reduced.

[0052] Please refer to Figures 7-10 The ventilation assembly 6 comprises a plurality of gate plates 601 arranged around the air inlet, one side of the gate plate 601 is connected with a first rotating block 602, the bottom of the first rotating block 602 is rotatably connected with a second rotating block 603, a plurality of second rotating blocks 603 are connected with a driving ring 604, one side of the driving ring 604 is drivingly connected with a driving mechanism 7, and the driving mechanism 7 drives the driving ring 604 to rotate to pull the gate plate 601 to move in the air inlet.

[0053] One side of the gate plate 601 is connected with a guide rod 605, the guide rod 605 is sleeved with a guide sleeve 607, the air inlet is provided with a containing groove for sliding the gate plate 601, the guide rod 605 extends to the bottom of the containing groove, a stroke groove is formed in the side of the guide rod 605, the guide sleeve 607 is connected in the stroke groove, and the guide rod 605 is sleeved with a second spring 606, and the two ends of the second spring 606 are connected with the guide sleeve 607 and the first rotating block 602 on one side.

[0054] The driving mechanism 7 comprises a connecting rod 703 rotatably connected to the bottom of the driving ring 604, the other end of the connecting rod 703 is rotatably connected with a push block 702, one side of the push block 702 is connected with an electric push rod 701, and the electric push rod 701 is connected to one side of the inner cavity of the static tank 4.

[0055] Specifically, through the designed ventilation assembly 6, the electric push rod 701 can work to drive the push block 702 to move, the push block 702 can drive the connecting rod 703 to push the driving ring 604 to rotate, the driving ring 604 can drive the second rotating block 603 and the first rotating block 602 to move, and the first rotating block 602 can drive the shutter 601 to move in the air inlet, so that the air inlet can be opened or closed as needed. Through the opening and closing control of the air inlet, the gas concentration in the static tank 4 can be adjusted when the water surface greenhouse gas is treated, the subsequent sampling treatment by the sampling machine body 5 is facilitated, and the control of the gas environment in the static tank 4 is facilitated to improve the sampling precision.

[0056] Meanwhile, the shutter 601 slides in the guide sleeve 607 through the guide rod 605, the guide rod 605 and the inner cavity of the guide sleeve 607 are both arc-shaped in cross-section, the shutter 601 can be guided by the guide rod 605 to stably slide into the containing groove, and the second spring 606 outside the guide rod 605 can keep the shutter 601 closed in the air inlet by using the elastic force of the second spring 606, so that the shutter 601 is prevented from being opened in the water body due to shaking impact and affecting the stability in the static tank 4.

[0057] The sampling machine body 5 can be a pump body with quantitative suction control, which sucks the water surface greenhouse gas in the static tank 4 through the suction nozzle, and is connected to the inner side of the static tank 4 through the bottom plate 11.

[0058] Please refer to Figure 3 A plurality of vacuum air storage bags 9 are arranged equidistantly along the axis in the inner cavity of the sample tank 12, and the air injection ports of the vacuum air storage bags 9 are located on one side of the radial rotation stroke of the rotary air charging head 10.

[0059] Please refer to Figures 7-8 The control mechanism 8 includes a fixed ring 801 and a rotating ring 805, the rotating ring 805 is connected to the inner side of the driving ring 604 through the connecting plate 807, the fixed ring 801 is connected to the bottom of the inner cavity of the static tank 4, a plurality of sliding holes are arranged on the top of the fixed ring 801, a lifting rod 804 is slidably connected in the sliding holes, the bottom end of the lifting rod 804 is in contact with a wedge block 806 arranged at the corresponding position on the top of the rotating ring 805, the wedge block 806 is pressed against the lifting rod 804 by the rotation of the driving ring 604, the top end of the lifting rod 804 is connected with a connecting rod 802, the lifting rod 804 is sleeved with a third spring, the two ends of the third spring are connected with the fixed ring 801 and the side of the connecting rod 802 at the corresponding positions, the other end of the connecting rod 802 is connected with a top rod 803 at the top, and the top rod 803 penetrates through the static tank 4 and the sample tank 12 and is connected to the bottom side of the rotary air charging head 10.

[0060] The cross-sectional shape of the wedge block 806 is triangular, and the top inclined surface of the wedge block 806 is fitted with the bottom of the lifting rod 804.

[0061] Through the designed control mechanism 8, when the driving ring 604 rotates, the inner rotating ring 805 can be driven to rotate through the connecting plate 807, the rotating ring 805 rotating can drive the wedge block 806 to extrude the lifting rod 804, and the lifting rod 804 being extruded can drive the top rod 803 and the rotary inflation head 10 to move upwards, the rotary inflation head 10 moving upwards can make the joint separate from the corresponding position of the vacuum air storage bag 9, so that the connection of the rotary inflation head 10 and the vacuum air storage bag 9 can be controlled through the control mechanism 8 linkage, and the static tank 4 in the exhaust state can be stopped to rotate the inflation head 10 through linkage control.

[0062] Through the designed third spring, after the shutter 601 resets to close the air inlet, the top rod 803 can pull the rotary inflation head 10 to reset through the elastic force of the third spring, and the connection of the rotary inflation head 10 and the corresponding position of the vacuum air storage bag 9 is completed.

[0063] The rotary inflation head 10 is an inflation head with a rotating mechanism, the inflation head has a gas nozzle matched with the interface of the vacuum air storage bag 9, and the inflation head is connected with the gas inlet of the sampling machine main body 5 through a gas-liquid slip ring and a pipeline, and the rotating mechanism is a mature technology in the related field and will not be described.

[0064] The sample tank 12 has a corresponding cover body to close the inner cavity of the sample tank 12, and the cover body can be opened through buckle or threaded cooperation.

[0065] In another embodiment, a corresponding solar power supply component can be arranged on the surface of the floating bag 301, and the sampling machine main body 5 is powered and used through the solar power supply component.

[0066] In the present application, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more than two, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A gas detection device for greenhouses comprising an outer support ring (1), characterized in that, The outer support ring (1) is internally provided with a plurality of floating body mechanisms (3) along the axis, and the inner side of the floating body mechanism (3) is connected with an inner support ring (2), and the top of the inner support ring (2) is connected with a static box (4), and the top of the static box (4) is provided with a sample box (12), and the static box (4) is internally provided with a sampling machine body (5), and the sampling machine body (5) is used to extract the greenhouse gas in the sample box (12) into the sample box (12); The static box (4) is provided with a plurality of air inlets on the outer periphery, and the air inlet is provided with an openable and closable ventilation assembly (6), and the ventilation assembly (6) is provided with a driving mechanism (7) on one side, and the driving mechanism (7) is connected in the static box (4), and the driving mechanism (7) controls the opening and closing of the ventilation assembly (6) in the air inlet, and the driving mechanism (7) is drivingly connected with a control mechanism (8) on one side, and the sample box (12) is provided with a rotatable air charging head (10) which can be lifted, and the control mechanism (8) extends into the sample box (12) and controls the lifting of the rotatable air charging head (10), and the lifting of the rotatable air charging head (10) is controlled by the opening and closing of the air inlet, so as to control the sampling gas concentration in the static box (4); The control mechanism (8) comprises a fixed ring (801) and a rotating ring (805), the rotating ring (805) is connected to the inner side of the driving ring (604) through the connecting plate (807) on the outside, the fixed ring (801) is connected to the bottom of the inner cavity of the static box (4), a plurality of sliding holes are formed on the top of the fixed ring (801), and the lifting rod (804) is slidably connected in the sliding hole, the bottom end of the lifting rod (804) is in contact with the wedge block (806) provided at the corresponding position on the top of the rotating ring (805), the driving ring (604) is rotated to drive the wedge block (806) to press the lifting rod (804), the top end of the lifting rod (804) is connected with the connecting rod (802), the lifting rod (804) is provided with a third spring, and the two ends of the third spring are connected with the fixed ring (801) and the connecting rod (802) on one side, respectively, the other end of the connecting rod (802) is connected with the top rod (803), and the top rod (803) penetrates through the static box (4) and the sample box (12) and is connected to the bottom side of the rotatable air charging head (10). The floating body mechanism (3) includes a floating bag (301), an energy absorbing ring block (310) is arranged inside the floating bag (301), the energy absorbing ring block (310) is connected to the outside of the inner support ring (2) through a universal joint (307), the floating bag (301) is connected with a fixed block (306) on both sides of the energy absorbing ring block (310) and the outer support ring (1), one side of the fixed block (306) is connected with a hinged block (305), the hinged block (305) is rotatably connected with a hinge seat (304), the hinge seat (304) on one side of the energy absorbing ring block (310) is connected to one side of the energy absorbing ring block (310), the hinge seat (304) on one side of the outer support ring (1) is connected with a guide rod (302), the guide rod (302) is slidably connected in a guide hole formed in the side wall of the outer support ring (1), a first spring (303) is arranged on the guide rod (302), and two ends of the first spring (303) are connected with the end of the guide rod (302) and the corresponding position on one side of the outer support ring (1), respectively, and the hinge seat (304) and the hinged block (305) on both sides of the floating bag (301) form a rotary pair buffer energy absorbing; The ventilation assembly (6) includes a plurality of flashboard (601) arranged around the air inlet, the flashboard (601) is connected with a first rotating block (602) on one side of the bottom, the first rotating block (602) is rotatably connected with a second rotating block (603), a plurality of second rotating blocks (603) are connected with a driving ring (604), and the driving ring (604) is rotatably connected with a driving mechanism (7) on one side, the driving ring (604) is driven to rotate by the driving mechanism (7) to drive the flashboard (601) to move in the air inlet.

2. The gas detection device for a greenhouse according to claim 1, wherein A plurality of energy absorbing ring blocks (310) are connected with a first fixed plate (308) and a second fixed plate (309) on both sides, a sleeve hoop (311) is connected on one side of the first fixed plate (308), a plurality of elastic blocks (312) are arranged in the inner cavity of the sleeve hoop (311) along the axis, a pressing block (313) is slidably connected in the inner cavity of the sleeve hoop (311), the pressing block (313) is connected with one side of the second fixed plate (309) through a rod body, and the elastic blocks (312) are pressed by moving the rod body to absorb the shaking of the energy absorbing ring blocks (310) on both sides.

3. The gas detection device for a greenhouse according to claim 1, wherein The diameter of the sleeve hoop (311) is smaller than the diameter of the inner wall of the sleeve hoop (311), the sleeve hoop (311) is limited in the sleeve hoop (311) by the elastic blocks (312), and the second fixed plate (309) is connected with the rod body and the pressing block (313) to extrude the elastic blocks (312) to absorb energy and buffer.

4. The gas detection device for a greenhouse according to claim 1, wherein The shutter (601) is connected with a guide rod (605) on one side, the guide rod (605) is provided with a guide sleeve (607), the air inlet is provided with a containing groove for the shutter (601) to slide in, the guide rod (605) extends to the bottom of the containing groove and is provided with a stroke groove on the side of the guide rod (605), the guide sleeve (607) is connected in the stroke groove, the guide rod (605) is provided with a second spring (606), and the two ends of the second spring (606) are connected with the guide sleeve (607) and the first rotating block (602) on the corresponding positions on one side respectively.

5. The gas detection device for a greenhouse according to claim 1, wherein The driving mechanism (7) comprises a connecting rod (703) rotatably connected to the bottom of the driving ring (604), the other end of the connecting rod (703) is rotatably connected with a push block (702), the push block (702) is connected with an electric push rod (701) on one side, and the electric push rod (701) is connected to one side of the inner cavity of the static box (4).

6. The gas detection device for a greenhouse according to claim 1, wherein A plurality of vacuum air storage bags (9) are arranged equidistantly along the axis in the inner cavity of the sample box (12), and the air injection port of the vacuum air storage bag (9) is located on the radial side of the rotation stroke of the rotary air charging head (10).

7. The gas detection device for a greenhouse according to claim 1, wherein The wedge block (806) is triangular in cross section, and the top inclined surface of the wedge block (806) is attached to the bottom of the lifting rod (804).

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