Sampling device

Abstract

The utility model belongs to the technical field of gas sampling, and discloses a sampling device which comprises a box body, a rotating frame, a sampling unit, an air exhaust driving mechanism and a rotation driving mechanism, a sampling opening is formed in the box body; the rotating frame is rotationally arranged in the box body, and a plurality of mounting spaces for mounting the sampling units are formed in the circumferential direction of the rotating frame; the sampling unit comprises a sampling tank and an air exhaust assembly, an air exhaust opening capable of being opened and closed is formed in the sampling tank, and the air exhaust assembly is installed on the sampling tank; the air exhaust driving mechanism is arranged in the box body and is used for being matched with the air exhaust assembly so as to drive the air exhaust assembly to exhaust air into the sampling tank through the air exhaust opening; the rotation driving mechanism is connected with the rotating frame and is used for driving the rotating frame to rotate, so that the air exhaust assembly of each sampling unit can be matched with the air exhaust driving mechanism. The sampling device can automatically extract coal bed gas, is convenient to use, can continuously collect a plurality of coal bed gas samples at a time, and is relatively high in sampling efficiency.

Description

Technical Field

[0001] This utility model relates to the field of gas sampling technology, and in particular to a sampling device. Background Technology

[0002] Coalbed methane refers to hydrocarbon gases stored in coal seams, mainly composed of methane, which are primarily adsorbed on the surface of coal matrix particles, with some remaining free in coal pores or dissolved in coal seam water. It is a associated mineral resource of coal and belongs to unconventional natural gas.

[0003] Before coalbed methane (CBM) extraction, it is necessary to use a CBM sampling device to collect CBM samples and analyze them. Most existing CBM sampling devices only store CBM and cannot automatically extract it, making them inconvenient to use. Furthermore, existing CBM sampling devices generally can only collect one CBM sample at a time, preventing the continuous collection of multiple samples and resulting in low sampling efficiency.

[0004] Therefore, there is an urgent need to develop a sampling device to solve the above-mentioned technical problems. Utility Model Content

[0005] This invention provides a sampling device that can automatically extract coalbed methane, is easy to use, and can continuously collect multiple coalbed methane samples at a time, resulting in high sampling efficiency.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Sampling device, including:

[0008] The container is equipped with a sampling port;

[0009] A rotating frame is rotatably mounted inside the housing. The rotating frame has multiple mounting spaces, which are spaced apart circumferentially along the rotating frame.

[0010] A sampling unit is provided in a one-to-one correspondence with the installation space. The sampling unit includes a sampling canister and an air extraction component. The sampling canister is installed in the installation space and is provided with an openable and closable air extraction port. The air extraction component is installed in the sampling canister and is used to extract air into the sampling canister through the air extraction port.

[0011] An air extraction drive mechanism is disposed inside the housing and is used to cooperate with the air extraction assembly to drive the air extraction assembly to extract air.

[0012] A rotation drive mechanism, connected to the rotating frame, is used to drive the rotating frame to rotate so that the air extraction component of each sampling unit can cooperate with the air extraction drive mechanism.

[0013] Optionally, the air extraction port is located at the bottom of the sampling container; the air extraction assembly includes a piston disposed inside the sampling container and a piston rod connected to the piston, one end of the piston rod extending out of the sampling container, and the air extraction drive mechanism is able to contact the piston rod and pull the piston rod to move, so that the piston rod drives the piston to extract air.

[0014] Optionally, the piston rod extending out of the sampling container is provided with a first connecting plate; the suction drive mechanism includes a first drive member, a telescopic rod, and a second connecting plate. The first drive member is connected to the housing, one end of the telescopic rod is connected to the first drive member, and the other end is connected to the second connecting plate. The first drive member is used to drive the telescopic rod to extend and retract. The telescopic rod retracts to cause the second connecting plate to contact the first connecting plate and pull the first connecting plate to move.

[0015] Optionally, the rotating frame includes:

[0016] A rotating shaft is rotatably mounted on the top of the housing, with one end of the rotating shaft extending out of the top of the housing and connected to the rotation drive mechanism;

[0017] A mounting plate is disposed on the rotating shaft. The mounting plate is provided with a plurality of mounting parts, which are spaced apart along the circumference of the mounting plate. Each mounting part is provided with a through hole for communicating with the air extraction port.

[0018] The pressure plate is detachably installed on the rotating shaft. The pressure plate and the mounting plate form multiple mounting spaces. The sampling can is disposed between the mounting part and the pressure plate. The pressure plate is provided with a first opening corresponding to each of the sampling units. The first opening is used for the piston rod to pass through.

[0019] Optionally, the other end of the rotating shaft is connected to the middle of the mounting plate, the middle of the pressure plate is provided with a connecting hole, the pressure plate is sleeved on the rotating shaft through the connecting hole, the rotating shaft is provided with an external thread, a nut is installed at the part of the rotating shaft where the external thread is located, the nut is located on the side of the pressure plate away from the mounting plate, so as to press the pressure plate against the plurality of sampling tanks.

[0020] Optionally, the mounting part is a groove provided on the mounting plate, and one end of the sampling can is inserted into the groove.

[0021] Optionally, the end of the piston rod extending out of the sampling can is provided with a first connecting plate for cooperating with the air extraction drive mechanism; the first opening includes a first clearance hole and a second clearance hole connected to each other, the first clearance hole being adapted to the first connecting plate, and the second clearance hole being adapted to the piston rod.

[0022] Optionally, the air extraction port is provided with a first one-way valve to allow external gas to enter the sampling container, and the bottom of the sampling container is also provided with an exhaust port, and the exhaust port is provided with a second one-way valve to allow the gas in the sampling container to be discharged.

[0023] Optionally, the bottom of the box is provided with multiple casters; and / or, the box is provided with a handle.

[0024] Optionally, a second opening is provided on one side of the box, and an openable and closable door is provided at the second opening.

[0025] The beneficial effects of this utility model are:

[0026] This invention provides a sampling device, including a housing, a rotating frame, sampling units, an air extraction drive mechanism, and a rotation drive mechanism. During sampling, the housing is transported to the sampling location. The air extraction port of the sampling tank opposite the air extraction drive mechanism is connected to the coalbed methane output pipeline to be sampled through the sampling port. The air extraction drive mechanism is controlled to cooperate with the air extraction component on the sampling tank, allowing the coalbed methane to enter the sampling tank. After sampling, the air extraction port is closed, disconnecting it from the coalbed methane output pipeline. Then, the rotation drive mechanism is controlled to rotate the next sampling unit to the air extraction drive mechanism, repeating the above operation until sampling of all sampling units is completed. This sampling device, through the cooperation of the air extraction drive mechanism and the air extraction component, can achieve automatic extraction of coalbed methane, facilitating operation. Furthermore, through the cooperation of the rotation drive mechanism, the rotating frame, and the air extraction drive mechanism, on the one hand, multiple coalbed methane samples can be collected, improving sampling efficiency; on the other hand, multiple sampling units can share a single air extraction drive mechanism, simplifying the structure of the sampling device and helping to reduce costs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the sampling device provided in an embodiment of the present invention;

[0029] Figure 2 This is an internal schematic diagram of the box provided in an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the sampling unit provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the mounting plate provided in this embodiment of the utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the pressure plate provided in this embodiment of the utility model.

[0033] In the picture:

[0034] 100. Box body; 110. Casters; 120. Handle; 130. Box door;

[0035] 200, Rotating frame; 210, Rotating shaft; 211, External thread; 220, Mounting plate; 221, Mounting part; 222, Through hole; 230, Pressure plate; 231, First opening; 2311, First clearance hole; 2312, Second clearance hole; 240, Nut;

[0036] 300, Sampling unit; 310, Sampling container; 311, Air extraction port; 312, Exhaust port; 320, Piston; 330, Piston rod; 331, First connecting plate; 340, First check valve; 350, Second check valve;

[0037] 400, Air extraction drive mechanism; 410, First drive component; 420, Telescopic rod; 430, Second connecting plate; 500, Rotation drive mechanism. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0039] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] This embodiment provides a sampling device that can automatically extract coalbed methane, is easy to use, and can continuously collect multiple coalbed methane samples at a time, resulting in high sampling efficiency.

[0043] Specifically, such as Figure 1 and Figure 2 As shown, the sampling device includes a housing 100, a rotating frame 200, a sampling unit 300, a suction drive mechanism 400, and a rotation drive mechanism 500. The housing 100 has a sampling port (not shown). The rotating frame 200 is rotatably mounted inside the housing 100 and has multiple mounting spaces spaced circumferentially along its length. Each sampling unit 300 corresponds to one of the mounting spaces and includes a sampling canister 310 and a suction assembly. The sampling canister 310 is installed within a mounting space and has an openable / closable suction port 311. The suction assembly is installed in the sampling canister 310 and is used to suction air into the sampling canister 310 through the suction port 311. The suction drive mechanism 400 is located inside the housing 100 and works in conjunction with the suction assembly to drive it to perform suction. The rotation drive mechanism 500 is connected to the rotating frame 200 and is used to drive the rotating frame 200 to rotate so that the air extraction component of each sampling unit 300 can cooperate with the air extraction drive mechanism 400.

[0044] The sampling method using this sampling device is as follows:

[0045] First, transport the container 100 to the sampling location;

[0046] Then, the control rotation drive mechanism 500 drives the rotating frame 200 to rotate, rotating one of the sampling units 300 to be opposite to the suction drive mechanism 400.

[0047] Then, the extraction port 311 of the sampling tank 310 of the sampling unit 300 is connected to the coalbed methane output pipeline to be sampled through the sampling port on the housing 100.

[0048] Then, the control pumping drive mechanism 400 cooperates with the pumping assembly on the sampling tank 310 to allow coalbed methane to enter the sampling tank 310. After sampling is completed, the pumping port 311 is closed and the connection between the pumping port 311 and the coalbed methane output pipeline is disconnected.

[0049] Then, control the vacuum drive mechanism 400 to return to the initial state, and control the rotation drive mechanism 500 to drive the rotating frame 200 to rotate, so that the next sampling unit 300 is rotated to be opposite to the vacuum drive mechanism 400. Repeat the above operation until all sampling units 300 are sampled.

[0050] This sampling device, through the cooperation of the suction drive mechanism 400 and the suction assembly, can automatically extract coalbed methane, making it easy to operate. Furthermore, by cooperating with the rotation drive mechanism 500, the rotating frame 200, and the suction drive mechanism 400, multiple coalbed methane samples can be collected, improving sampling efficiency. On the other hand, multiple sampling units 300 can share a single suction drive mechanism 400, simplifying the structure of the sampling device and helping to reduce costs.

[0051] It is worth noting that the sampling device provided in this embodiment can sample not only coalbed methane, but also other gases or liquids, making it highly versatile.

[0052] Optionally, see [link to relevant documentation] Figure 1 The bottom of the container 100 is equipped with multiple casters 110. By providing multiple casters 110, the container 100 can be transported conveniently.

[0053] Optionally, see [link to relevant documentation] Figure 1 The container 100 is equipped with a handle 120. By providing the handle 120, sampling personnel can transport the container 100 through the handle 120, making it easy to operate.

[0054] Optionally, see [link to relevant documentation] Figure 1 The housing 100 has a second opening on one side, and a closable door 130 at the second opening. This design facilitates the sampling personnel in opening the housing 100 to retrieve and place the sampling unit 300.

[0055] Furthermore, such as Figure 2 and Figure 3As shown, the extraction port 311 is located at the bottom of the sampling tank 310. The extraction assembly includes a piston 320 disposed inside the sampling tank 310 and a piston rod 330 connected to the piston 320. One end of the piston rod 330 extends out of the sampling tank 310. The extraction drive mechanism 400 can contact the piston rod 330 and pull the piston rod 330 to move, so that the piston rod 330 drives the piston 320 to extract gas. This extraction assembly has a simple structure, and the reliability of gas extraction achieved through the piston 320 structure is also good. Furthermore, when testing the coalbed methane after sampling, the piston rod 330 can push the piston 320 to push the gas in the sampling tank 310 out through the extraction port 311 for testing, which is convenient for venting. In addition, placing the extraction port 311 at the bottom of the sampling tank 310 allows all the gas in the sampling tank 310 to be discharged through the piston 320 before sampling, avoiding other gases from affecting the coalbed methane test results.

[0056] Optionally, see [link to relevant documentation] Figure 2 The piston rod 330 extends out of the sampling container 310 and is provided with a first connecting plate 331. The suction drive mechanism 400 includes a first drive member 410, a telescopic rod 420, and a second connecting plate 430. The first drive member 410 is connected to the housing 100. One end of the telescopic rod 420 is connected to the first drive member 410, and the other end is connected to the second connecting plate 430. The first drive member 410 is used to drive the telescopic rod 420 to extend and retract. The telescopic rod 420, by retracting, causes the second connecting plate 430 to contact the first connecting plate 331 and pulls the first connecting plate 331 to move.

[0057] In this embodiment, the first drive member 410 is connected to the top of the housing 100.

[0058] For ease of understanding, let's take... Figure 2 Taking the installation method shown as an example, a brief introduction will be given to the cooperation between the air extraction drive mechanism 400 and the piston rod 330:

[0059] First, adjust the suction drive mechanism 400 to its initial state. The initial state of the suction drive mechanism 400 is that the telescopic rod 420 is in the extended state, so as to ensure that the second connecting plate 430 is located below the first connecting plate 331, and to avoid the second connecting plate 430 interfering with the first connecting plate 331 when the rotating frame 200 rotates;

[0060] Then, the control rotation drive mechanism 500 drives the rotating frame 200 to rotate, so that one of the sampling units 300 is opposite to the suction drive mechanism 400, that is, so that the first connecting plate 331 on the sampling unit 300 is above the second connecting plate 430.

[0061] Finally, the first driving component 410 is controlled to retract the telescopic rod 420. The second connecting plate 430 on the telescopic rod 420 will then contact the first connecting plate 331 and pull the first connecting plate 331 upward, allowing the piston rod 330 to drive the piston 320 to move, thereby drawing coalbed methane into the sampling tank 310. Once the telescopic rod 420 has moved to its final position, the coalbed methane sampling of the sampling unit 300 is complete.

[0062] The suction drive mechanism 400 has a simple structure. The first connecting plate 331 and the second connecting plate 430 realize the cooperation between the suction drive mechanism 400 and the piston rod 330, which is easy to operate and has good working reliability.

[0063] Optionally, the structure consisting of the first driving member 410 and the telescopic rod 420 can be a cylinder or a hydraulic cylinder, etc., which can be set according to actual needs, and this application does not make specific limitations.

[0064] Further, see also Figure 2 The rotating frame 200 includes a rotating shaft 210, a mounting plate 220, and a pressure plate 230. The rotating shaft 210 is rotatably mounted on the top of the housing 100, with one end extending out of the top of the housing 100 and connected to a rotation drive mechanism 500. The rotation drive mechanism 500 drives the rotating shaft 210 to rotate, thus rotating the rotating frame 200. The mounting plate 220 is disposed on the rotating shaft 210 and has multiple mounting portions 221 spaced circumferentially along the mounting plate 220. Each mounting portion 221 has a through hole 222 for communicating with an air extraction port 311. The pressure plate 230 is detachably mounted on the rotating shaft 210. The pressure plate 230 and the mounting plate 220 form multiple mounting spaces. The sampling container 310 is positioned between the mounting part 221 and the pressure plate 230. The pressure plate 230 has a first opening 231 corresponding to each sampling unit 300, which is used for the piston rod 330 to pass through. This rotating frame 200 has a simple structure and provides good fixation for the sampling unit 300.

[0065] It is understandable that the rotation drive mechanism 500 is optional but not limited to an electric motor.

[0066] Optionally, see [link to relevant documentation] Figure 2The other end of the rotating shaft 210 is connected to the middle of the mounting plate 220. The middle of the pressure plate 230 has a connecting hole, through which the pressure plate 230 is fitted onto the rotating shaft 210. The rotating shaft 210 has an external thread 211, and a nut 240 is installed at the external thread 211. The nut 240 is located on the side of the pressure plate 230 away from the mounting plate 220, pressing the pressure plate 230 against multiple sampling containers 310. By pressing the pressure plate 230 against the sampling containers 310 with the nut 240, it is ensured that the pressure plate 230 and the mounting plate 220 reliably clamp the sampling containers 310, preventing movement of the sampling containers 310 during the pulling of the piston rod 330, thus improving sampling reliability. Furthermore, the structure is simple and easy to assemble.

[0067] Furthermore, such as Figure 4 As shown, in this embodiment, the mounting part 221 is a groove provided on the mounting plate 220, and one end of the sampling canister 310 is inserted into the groove. By fixing the sampling canister 310 by inserting it into the groove, on the one hand, it is convenient to assemble the sampling canister 310 on the mounting plate 220; on the other hand, it can effectively prevent the sampling canister 310 from tilting before the pressure plate 230 is installed, thus facilitating the assembly of the pressure plate 230.

[0068] Furthermore, such as Figure 5 As shown, the end of the piston rod 330 extending out of the sampling container 310 is provided with a first connecting plate 331 for cooperating with the suction drive mechanism 400. The first opening 231 includes a first clearance hole 2311 and a second clearance hole 2312 that are connected to each other. The first clearance hole 2311 is adapted to the first connecting plate 331, and the second clearance hole 2312 is adapted to the piston rod 330. When installing the pressure plate 230, firstly, align the first clearance hole 2311 with the first connecting plate 331 one by one, then press down the pressure plate 230 so that the first connecting plate 331 passes through the first clearance hole 2311 until the pressure plate 230 abuts against the sampling container 310. Then, rotate the pressure plate 230 so that the piston rod 330 enters the second clearance hole 2312 until it abuts against the wall of the second clearance hole 2312. By setting the first clearance hole 2311 and the second clearance hole 2312, interference between the first connecting plate 331 and the piston rod 330 can be avoided when the pressure plate 230 is installed. Furthermore, the pressure plate 230 applies force to the sampling canister 310 more evenly, resulting in a better effect of fixing the sampling canister 310.

[0069] The method for fixing the sampling unit 300 using the rotating frame 200 is as follows:

[0070] First, move the pressure plate 230 away from the mounting plate 220;

[0071] Then, each sampling unit 300 is fixed to the mounting part 221 with the air extraction port 311 at the bottom of the sampling canister 310 facing the through hole 222.

[0072] Then, rotate the pressure plate 230 so that the first clearance hole 2311 corresponds one-to-one with the first connecting plate 331. Then press down the pressure plate 230 so that the first connecting plate 331 passes through the first clearance hole 2311 until the pressure plate 230 abuts against the sampling tank 310. Then rotate the pressure plate 230 again so that the piston rod 330 enters the second clearance hole 2312 until it abuts against the hole wall of the second clearance hole 2312.

[0073] Finally, rotate the nut 240 so that it presses against the pressure plate 230.

[0074] Further, see also Figure 2 A first one-way valve 340 is provided at the extraction port 311 to allow outside gas to enter the sampling tank 310. An exhaust port 312 is also provided at the bottom of the sampling tank 310, and a second one-way valve 350 is provided at the exhaust port 312 to allow gas to exit the sampling tank 310. Since the diameter of the coalbed methane output pipeline may differ from the diameter of the equipment used for coalbed methane detection and analysis, the diameter of the extraction port 311 is generally set to match the diameter of the coalbed methane output pipeline, and the diameter of the exhaust port 312 is set to match the diameter of the coalbed methane detection equipment for ease of use.

[0075] It is worth noting that an air inlet is typically provided at the bottom of the sampling container 310, and a short section of air inlet pipe is connected to the air inlet to form an air extraction port 311. A first one-way valve 340 is installed on the air inlet pipe. Similarly, an air outlet is provided at the bottom of the sampling container 310, and a short section of air outlet pipe is connected to the air outlet to form an air exhaust port 312. A second one-way valve 350 is installed on the air exhaust pipe.

[0076] Optionally, in this embodiment, the sampling port is located at the bottom of the housing 100.

[0077] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A sampling device, characterized in that, include: A housing (100) is provided with a sampling port; A rotating frame (200) is rotatably disposed inside the housing (100). The rotating frame (200) is provided with multiple installation spaces, which are spaced apart circumferentially along the rotating frame (200). A sampling unit (300) is provided in a one-to-one correspondence with the installation space. The sampling unit (300) includes a sampling canister (310) and an air extraction component. The sampling canister (310) is installed in the installation space. The sampling canister (310) is provided with an openable and closable air extraction port (311). The air extraction component is installed in the sampling canister (310) and is used to extract air into the sampling canister (310) through the air extraction port (311). A suction drive mechanism (400) is disposed inside the housing (100) and is used to cooperate with the suction assembly to drive the suction assembly to perform suction. A rotation drive mechanism (500) is connected to the rotating frame (200) and is used to drive the rotating frame (200) to rotate so that the suction assembly of each sampling unit (300) can cooperate with the suction drive mechanism (400).

2. The sampling device according to claim 1, characterized in that, The air extraction port (311) is located at the bottom of the sampling container (310); the air extraction assembly includes a piston (320) disposed in the sampling container (310) and a piston rod (330) connected to the piston (320). One end of the piston rod (330) extends out of the sampling container (310), and the air extraction drive mechanism (400) can contact the piston rod (330) and pull the piston rod (330) to move, so that the piston rod (330) drives the piston (320) to extract air.

3. The sampling device according to claim 2, characterized in that, The piston rod (330) has a first connecting plate (331) at the end extending out of the sampling container (310); the suction drive mechanism (400) includes a first drive member (410), a telescopic rod (420) and a second connecting plate (430). The first drive member (410) is connected to the box body (100). One end of the telescopic rod (420) is connected to the first drive member (410) and the other end is connected to the second connecting plate (430). The first drive member (410) is used to drive the telescopic rod (420) to extend and retract. The telescopic rod (420) retracts and drives the second connecting plate (430) to contact the first connecting plate (331) and pulls the first connecting plate (331) to move.

4. The sampling device according to claim 2, characterized in that, The rotating frame (200) includes: A rotating shaft (210) is rotatably mounted on the top of the housing (100), with one end of the rotating shaft (210) extending out of the top of the housing (100) and connected to the rotation drive mechanism (500); A mounting plate (220) is disposed on the rotating shaft (210). The mounting plate (220) is provided with a plurality of mounting parts (221). The plurality of mounting parts (221) are arranged at intervals along the circumference of the mounting plate (220). The mounting parts (221) are provided with through holes (222) for communicating with the air extraction port (311). The pressure plate (230) is detachably installed on the rotating shaft (210). The pressure plate (230) and the mounting plate (220) form multiple mounting spaces. The sampling tank (310) is disposed between the mounting part (221) and the pressure plate (230). The pressure plate (230) is provided with a first opening (231) corresponding to the sampling unit (300). The first opening (231) is used for the piston rod (330) to pass through.

5. The sampling device according to claim 4, characterized in that, The other end of the rotating shaft (210) is connected to the middle of the mounting plate (220). The middle of the pressure plate (230) is provided with a connecting hole. The pressure plate (230) is sleeved on the rotating shaft (210) through the connecting hole. The rotating shaft (210) is provided with an external thread (211). A nut (240) is installed at the external thread (211) on the rotating shaft (210). The nut (240) is located on the side of the pressure plate (230) away from the mounting plate (220) so as to press the pressure plate (230) against the plurality of sampling tanks (310).

6. The sampling device according to claim 4, characterized in that, The mounting part (221) is a groove provided on the mounting plate (220), and one end of the sampling container (310) is inserted into the groove.

7. The sampling device according to claim 4, characterized in that, The piston rod (330) extending out of the sampling container (310) has a first connecting plate (331) for cooperating with the suction drive mechanism (400); the first opening (231) includes a first clearance hole (2311) and a second clearance hole (2312) connected to each other, the first clearance hole (2311) is adapted to the first connecting plate (331), and the second clearance hole (2312) is adapted to the piston rod (330).

8. The sampling device according to claim 1, characterized in that, The air extraction port (311) is provided with a first one-way valve (340) that allows external gas to enter the sampling container (310). The bottom of the sampling container (310) is also provided with an exhaust port (312), and the exhaust port (312) is provided with a second one-way valve (350) that allows the gas in the sampling container (310) to be discharged.

9. The sampling device according to any one of claims 1-8, characterized in that, The bottom of the housing (100) is provided with a plurality of casters (110); and / or, the housing (100) is provided with a handle (120).

10. The sampling device according to any one of claims 1-8, characterized in that, The box (100) has a second opening on one side, and a closable door (130) is provided at the second opening.

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