Sampler with automatic airtightness detection function

Abstract

The invention relates to the technical field of samplers, in particular to a sampler with an automatic airtightness detection function, which comprises a shell, one side of the shell is rotatably provided with an opening and closing door, and the shell is internally provided with a sampling box for storing samples and a negative pressure machine for performing negative pressure extraction on the interior of the sampling box. A control center used for control is further arranged in the shell, a sampling pipe communicated with the sampling box is arranged on one side of the top end of the shell in a penetrating mode, and an adjusting assembly used for being matched with the sampling pipe is rotationally arranged at the top end of the shell. The adjusting assembly comprises a rotating top cover, a circular groove is formed in the bottom end of the rotating top cover, and a telescopic shaft rod is fixedly connected to the circle center of the groove. In the actual use process, the sampling process and the air tightness detection process can be stably switched, the sampling smoothness can be guaranteed at the same time, the phenomenon that the sampling process is affected by the pipe diameter difference value caused by the connecting piece is reduced, and the air tightness detection operation can be effectively and automatically carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of samplers, and particularly to a sampler with an automatic airtightness detection function. Background Art

[0002] A particulate matter air sampler is an instrument used to monitor and collect suspended particulate matter in the air. It allows a certain volume of air to pass through a filter membrane of known mass at a constant speed. The particulate matter suspended in the air is retained on the filter membrane. According to the increased mass of the filter membrane and the volume of air passing through the filter membrane, the mass concentration of total suspended particulate matter in the air is determined. It can be used to measure components such as metals, inorganic salts, and organic pollutants in particulate matter.

[0003] During the actual use process, it is usually necessary to perform an airtightness detection before sampling. Only after the airtightness detection is qualified can the sampling process be carried out. During this process, connecting instruments need to be replaced, which makes the use process cumbersome, easily causes pollution inside the pipeline, affects the sampling accuracy, and there are many connecting parts, which easily leads to a difference in pipe diameter inside during the sampling process, affecting the sampling smoothness. For this reason, we propose a sampler with an automatic airtightness detection function. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a sampler with an automatic airtightness detection function.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A sampler with an automatic airtightness detection function includes a housing. One side of the housing is rotatably provided with an opening and closing door. Inside the housing, there is a sampling box for storing samples, and a negative pressure machine for extracting negative pressure inside the sampling box. Inside the housing, there is also a control center for control. One side of the top of the housing is provided with a sampling tube communicating with the sampling box, and a regulating component for cooperating with the sampling tube is rotatably provided at the top of the housing, which facilitates the sampling process during sampling and the stable progress of the previous airtightness detection process;

[0007] The regulating component includes a rotating top cover. The bottom end of the rotating top cover is provided with a circular groove, and a telescopic shaft rod is fixedly connected at the center of the groove. One end of the telescopic shaft rod penetrates and extends to the inside of the housing. The top end of the rotating top cover is provided with two sets of through holes, and a sampling head of the same diameter is connected to the top of one set of through holes. The top end of the sampling tube touches the rotating top cover at the inner wall of the top end of the rotating top cover, and the sampling tube is adapted to the through holes;

[0008] The sampling box is equipped with an air pressure sensor module and a timer module, both of which are electrically connected to the control center, and the control center is electrically connected to the negative pressure machine. The control center is also equipped with an alarm module for alarm processing during the air tightness detection process.

[0009] As a preferred technical solution of the present application, the rotating top cover extends through and into the inner end of the outer shell and is connected to a baffle, and a spring is sleeved on the outside, and the two ends of the spring respectively contact the top inner wall of the outer shell and the baffle, thereby ensuring that the spring can be contracted when the sampling tube is inserted into any one of the two groups of through holes for sampling or air tightness testing, thereby achieving overall stability and ensuring the effective implementation of the corresponding experimental process.

[0010] As a preferred technical solution of the present application, two groups of arc-shaped clamping blocks are slidably arranged at the bottom end of the rotating top cover, and the gaps between the two groups of arc-shaped clamping blocks and the inner wall of the rotating top cover form an annular slide groove adapted to the sampling tube, thereby ensuring the relative stability of the adjustment component and the sampling tube during the rotation adjustment process;

[0011] The arc-shaped clamping block is provided with an arc notch which is directly opposite to the penetration hole, and the arc-shaped notch is adapted to the sampling tube. The arc-shaped clamping block is directional and moves in the direction in which the axis line of the notch points to the direction of the axis line of the corresponding penetration hole.

[0012] A pushing rod is hinged between the arc-shaped clamping block and the telescopic shaft rod, so that after the sampling tube is inserted into the penetration hole, it is acted upon by the spring to achieve the overall downward pressure of the adjustment component. At this time, the pushing rod deflects and pushes the corresponding arc-shaped clamping block to move in a directional manner toward the direction of the corresponding penetration hole, thereby clamping the sampling tube and further ensuring the stability of the corresponding sampling process or airtightness detection process.

[0013] As a preferred technical solution of the present application, two groups of slots connected to the through holes are provided on the peripheral side of the rotating top cover, and a blocking plate is inserted at the slot far away from the sampling head, which is used to ensure that the top of the sampling tube is in a blocked state during the air tightness test, thereby providing the necessary negative pressure guarantee for the air tightness test process;

[0014] A single-layer filter membrane clip is inserted into the slot of the rotating top cover corresponding to the sampling head, which is convenient for filtering during the sampling process and facilitating the pre-sampling of the sampling process. Through pre-sampling, it can be determined whether the area is suitable for sampling, so as to have a preliminary understanding of the particle concentration level, particle type and characteristics, environmental factors and pollution sources in the area. In the formal sampling process, the filter membrane at the single-layer filter membrane clip can be removed to ensure the effective implementation of the normal sampling process below.

[0015] As a preferred technical solution of the present application, two groups of holding rings are symmetrically arranged on the circumferential side of the rotating top cover, which is convenient for holding during the adjustment process and facilitates actual operation.

[0016] As a preferred technical solution of the present application, a top compartment is provided inside the top end of the outer shell, and the bottom end of the telescopic shaft rod penetrates through the outer shell and extends into the interior of the top compartment, thereby providing a separate space for the telescopic adjustment of the telescopic shaft rod and preventing it from affecting the operation of internal components.

[0017] One end of the telescopic shaft rod located inside the top compartment is coaxially connected to a plug-in prism at the bottom, and a control motor with an output shaft vertically upward is provided inside the top compartment. The top end of the control motor is coaxially connected to a synchronous sleeve, and a prism slot adapted to the plug-in prism is provided on the synchronous sleeve. The control motor is electrically connected to the control center. Thus, when the airtightness detection or sampling operation is carried out at the control center, the control motor can automatically rotate in the corresponding direction to achieve the purpose of automatic adjustment.

[0018] As a preferred technical solution of the present application, a filter membrane clip assembly communicated with the sampling box is further provided inside the outer shell. The filter membrane clip assembly is provided with multiple layers of filter membrane clips. Through the setting of the filter membrane clips, further filtration treatment of the collected samples is realized.

[0019] A filter membrane clip assembly controller for controlling the filter membrane clip assembly is further provided inside the outer shell, so as to effectively adjust the number of filter membrane clips participating in filtration on the filter membrane clip assembly, regulate the actual filtration effect, and carry out regulation for the needs of airtightness detection and sampling process.

[0020] As a preferred technical solution of the present application, support rods corresponding to the sampling tubes are symmetrically provided on the other side of the top end of the outer shell. The diameter of the support rods is the same as that of the sampling tubes, and the height of the support rods is the same as the height of the sampling tubes extending to the top end of the outer shell. Thus, during the adjustment process of the adjustment assembly, the sampling tubes and the support rods cooperate with the sealing plates to support the bottom of the adjustment assembly, better achieving balanced support on both sides of the overall adjustment assembly, ensuring the stability of the adjustment assembly, facilitating actual use, and with the help of the prism slots provided on the plug-in prisms, providing space redundancy during the lifting process of the adjustment assembly to avoid the phenomenon of movement interference.

[0021] As a preferred technical solution of the present application, the air pressure sensor is located inside the sampling box and is used to detect the air pressure inside the sampling box during the airtightness detection process. The air pressure sensor module is electrically connected to the timer module. During the airtightness detection process, when the air pressure inside the sampling box reaches a certain level, the timer module will be triggered. During this process, the air pressure sensor module feeds back the signal to the control center. The control center controls the negative pressure machine to close, and then the timer module counts down. When the countdown is completed, the timer module sends a signal to the control center. During the countdown process, if the value detected by the air pressure sensor module decreases and the timer module does not send a signal to the control center, it indicates that the internal airtightness is insufficient. At this time, the control center controls the alarm module to give a warning, so as to achieve the purpose of airtightness detection; on the contrary, when the countdown of the timer module ends and the value detected by the air pressure sensor module does not change, it indicates that the internal airtightness of the sampling box is intact and the subsequent sampling process can be carried out.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. First, through the setting of the spring on the adjustment component, the overall adjustment component is an adjustable structure. Under the elastic restraint of the spring, the sampling tube abuts against the inner wall of the top of the rotating top cover, ensuring the tightness during the adjustment process and reducing the pollution received during the sampling process;

[0024] 2. Through the setting of the through-hole on the adjustment component, the sampling tube and the sampling head can be effectively fitted, which effectively ensures the stable switching between the sampling process and the airtightness detection process, and ensures the smooth connection during the sampling process. It avoids the generation of internal pipe diameter differences caused by additional connectors and ensures the smoothness of sampling;

[0025] 3. Through the air pressure sensor, timer module, control center and alarm in the sampling box, the automatic airtightness detection of the inside of the sampling box is realized, providing effective pre-preparation for the sampling process and avoiding the phenomenon of sampling failure caused by insufficient airtightness.

[0026] In summary, during the actual use of the present application, the sampling process and the airtightness detection process can be stably switched, and the smoothness of sampling can be ensured at the same time. It reduces the phenomenon that the sampling process is affected by the pipe diameter difference caused by the connector, and can also effectively carry out the airtightness detection operation automatically. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of a sampler with an automatic airtightness detection function proposed by the present invention;

[0028] Figure 2 is a front view structural diagram of a sampler with an automatic airtightness detection function proposed by the present invention;

[0029] Figure 3 Structural schematic diagram of the adjustment component of a sampler with an automatic airtightness detection function proposed by the present invention;

[0030] Figure 4 Lower structural schematic diagram of the adjustment component of a sampler with an automatic airtightness detection function proposed by the present invention;

[0031] Figure 5 Bottom view structural schematic diagram of the adjustment component of a sampler with an automatic airtightness detection function proposed by the present invention;

[0032] Figure 6 is Figure 2 Enlarged structural schematic diagram at position A in

[0033] Figure 7 Process flow schematic diagram of the airtightness detection process of a sampler with an automatic airtightness detection function proposed by the present invention.

[0034] In the figure: 1. Outer shell; 2. Sampling box; 3. Filter membrane clamp assembly controller; 4. Filter membrane clamp assembly; 5. Control center; 6. Top compartment; 7. Sampling tube; 8. Adjustment component; 81. Rotating top cover; 82. Sampling head; 83. Holding ring; 84. Sealing plate; 85. Single-layer filter membrane clamp; 86. Telescopic shaft rod; 87. Spring; 88. Pushing rod; 89. Arc-shaped clamping block; 810. Through hole; 811. Insertion prism; 9. Support rod; 10. Negative pressure machine; 11. Opening and closing door; 12. Control motor; 13. Synchronous shaft sleeve. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0036] Referring to Figures 1-6 , a sampler with an automatic airtightness detection function includes an outer shell 1. An opening and closing door 11 is rotatably provided on one side of the outer shell 1. Inside the outer shell 1, there is a sampling box 2 for storing samples, and a negative pressure machine 10 for performing negative pressure extraction on the inside of the sampling box 2. Inside the outer shell 1, there is also a control center 5 for control. A sampling tube 7 communicating with the sampling box 2 is inserted through one side of the top of the outer shell 1, and an adjustment component 8 for cooperating with the sampling tube 7 is rotatably provided at the top of the outer shell 1, facilitating the sampling during the sampling process and the stable progress of the previous airtightness detection process;

[0037] The adjustment assembly 8 includes a rotating top cover 81. A circular groove is provided at the bottom end of the rotating top cover 81, and a telescopic shaft 86 is fixedly connected at the center of the groove. One end of the telescopic shaft 86 penetrates and extends into the interior of the outer shell 1. Two sets of through holes 810 are provided at the top end of the rotating top cover 81, and a sampling head 82 with the same diameter is connected to the top end of one set of through holes 810. The top end of the sampling tube 7 touches the inner wall of the top end of the rotating top cover 81, and the sampling tube 7 is adapted to the through hole 810;

[0038] A pressure sensor module and a timer module are provided in the sampling box 2, both of which are electrically connected to the control center 5, and the control center 5 is electrically connected to the negative pressure machine 10. An alarm module is also provided on the control center 5 for alarm processing during the airtightness detection process;

[0039] A top layer 6 is provided inside the top end of the outer shell 1. The bottom end of the telescopic shaft 86 penetrates the outer shell 1 and extends into the interior of the top layer 6, thereby providing a separate space for the telescopic adjustment of the telescopic shaft 86 and avoiding affecting the operation of internal components;

[0040] One end of the telescopic shaft 86 located inside the top layer 6 is coaxially connected to a plug-in prism 811 at the bottom. A control motor 12 with a vertically upward output shaft is provided inside the top layer 6. A synchronous shaft sleeve 13 is coaxially connected to the top end of the control motor 12. A prism slot adapted to the plug-in prism 811 is provided on the synchronous shaft sleeve 13, and the control motor 12 is electrically connected to the control center 5. Furthermore, when the control center 5 performs airtightness detection or sampling operations, the control motor 12 can automatically rotate in the corresponding direction to achieve the purpose of automatic adjustment. With the setting of the prism slot on the plug-in prism 811, space redundancy is given during the lifting process of the adjustment assembly 8 to avoid the phenomenon of movement interference.

[0041] A filter membrane clip assembly 4 communicated with the sampling box 2 is also provided inside the outer shell 1. Multiple filter membrane clips are provided on the filter membrane clip assembly 4. Through the setting of the filter membrane clips, further filtration processing of the collected samples is realized;

[0042] A filter membrane clip assembly controller 3 for controlling the filter membrane clip assembly 4 is also provided inside the outer shell 1, so as to effectively adjust the number of filter membrane clips participating in filtration on the filter membrane clip assembly 4, regulate the actual filtration effect, and conduct regulation for the needs of airtightness detection and sampling processes;

[0043] On the other side of the top end of the outer shell 1, there are symmetrically arranged support rods 9 corresponding to the sampling tubes 7. The diameter of the support rod 9 is the same as that of the sampling tube 7, and the height of the support rod 9 is the same as the height of the sampling tube 7 extending to the top end of the outer shell 1. Thus, during the adjustment process of the adjustment assembly 8, the sampling tube 7 and the support rod 9 cooperate with the sealing plate 84 to support the bottom of the adjustment assembly 8, better achieving balanced support on both sides of the overall adjustment assembly 8, ensuring the stability of the adjustment assembly 8, and facilitating actual use.

[0044] Referring to Figures 3-5 , one end of the rotating top cover 81 extending through the outer shell 1 is connected with a baffle, and a spring 87 is sleeved on the outside. The two ends of the spring 87 are respectively in contact with the inner wall of the top end of the outer shell 1 and the baffle, so as to ensure the contraction of the spring 87 during the process of inserting the sampling tube 7 into any one of the two through holes 810 for sampling or airtightness detection, realizing the overall stability and ensuring the effective progress of the corresponding experimental process.

[0045] Two arc-shaped clamping blocks 89 are slidably arranged at the bottom end of the rotating top cover 81. The gap between the two arc-shaped clamping blocks 89 and the inner wall of the rotating top cover 81 forms an annular chute adapted to the sampling tube 7, ensuring the relative stability between the adjustment assembly 8 and the sampling tube 7 during the rotation adjustment process;

[0046] An arc-shaped notch is formed on the arc-shaped clamping block 89 opposite to the through hole 810, and the arc-shaped notch is adapted to the sampling tube 7. The arc-shaped clamping block 89 moves in a fixed direction, and the moving direction is the direction from the axis of the notch to the axis of the corresponding through hole 810;

[0047] A push rod 88 is hinged between the arc-shaped clamping block 89 and the telescopic shaft rod 86. Thus, after the sampling tube 7 is inserted into the through hole 810, under the action of the spring 87, when the adjustment assembly 8 is pressed down as a whole, the push rod 88 deflects at this time, pushing the corresponding arc-shaped clamping block 89 to move in a fixed direction and approach the corresponding through hole 810, realizing the clamping of the sampling tube 7 and further ensuring the stable progress of the corresponding sampling process or airtightness detection process.

[0048] Two slots communicating with the through hole 810 are formed on the circumferential side of the rotating top cover 81, and a sealing plate 84 is inserted at the slot far from the sampling head 82, which is used to ensure that the top of the sampling tube 7 is in a sealed state during the airtightness detection process, providing the necessary negative pressure guarantee for the airtightness detection process;

[0049] The rotary top cover 81 is inserted with a single-layer filter membrane clip 85 at the slot corresponding to the sampling head 82, which facilitates the filtration process during sampling and the pre-sampling of the sampling process. Through the pre-sampling, it can be determined whether the area is suitable for sampling, so as to have a preliminary understanding of the particulate matter concentration level, particulate matter type and characteristics, environmental factor influence, and pollution source situation in this area. During the formal sampling process, the single-layer filter membrane clip 85 can be removed to ensure the effective progress of the normal sampling process below.

[0050] Two groups of holding rings 83 are symmetrically arranged on the circumferential side of the rotary top cover 81, which is convenient for holding during the adjustment process and facilitates the actual operation.

[0051] Refer to Figures 1-2 and Figure 7 , the air pressure sensor is located inside the sampling box 2 and is used to detect the air pressure inside the sampling box 2 during the airtightness detection process of the sampling box 2. The air pressure sensor module is electrically connected to the timer module. During the airtightness detection process, when the air pressure inside the sampling box 2 reaches a certain level, the timer module will be triggered. During this process, the air pressure sensor module feeds back the signal to the control center 5. The control center 5 controls the negative pressure machine 10 to close, and then the timer module counts down. When the countdown is completed, the timer module sends a signal to the control center 5. During the countdown process, if the timer module does not send a signal to the control center 5 and the value detected by the air pressure sensor module decreases, it indicates that the internal airtightness is insufficient. At this time, the control center 5 controls the alarm module to give a warning, so as to achieve the purpose of airtightness detection; on the contrary, when the countdown of the timer module ends and the value detected by the air pressure sensor module does not change, it indicates that the internal airtightness of the sampling box 2 is intact and the subsequent sampling process can be carried out.

[0052] Workflow: During the outdoor sampling process of the device, airtightness detection is required first. First, the control center 5 controls the operation of the control motor 12 to drive the synchronous bushing 13 to rotate the adjustment component 8, so that the sampling tube 7 is aligned with the through hole 810 away from the sampling head 82. At this time, a sealing plate 84 is inserted. At this time, the through hole 810 on the other side is aligned with the support rod 9. Under the action of the spring 87, the entire adjustment component 8 sinks, so that the sampling tube 7 is inserted into the through hole 810 and is blocked by the sealing plate 84 to achieve a sealing effect. Then, through the control of the control center 5 for program operations, first, the negative pressure machine 10 is started for negative pressure adsorption. At this time, the air pressure sensor module sends the negative pressure value inside the sampling box 2 to the control center 5. After reaching the target value, the control center 5 controls the negative pressure machine 10 to close, so that the inside of the sampling box 2 presents a closed space. At this time, a signal is sent to the timer module for countdown. Before the countdown is completed, if the air pressure sensor module detects a decrease in the air pressure value, it indicates insufficient airtightness inside, and an alarm will be given through the alarm to prevent the subsequent sampling process from proceeding. Otherwise, it indicates good airtightness;

[0053] During sampling, the control center 5 controls the control motor 12 to drive the synchronous bushing 13 to rotate the adjustment component 8 to connect the sampling head 82 and the sampling tube 7. During the rotation and adjustment of the adjustment component 8, when the adjustment component 8 does not sink, a single-layer filter membrane clip 85 is first inserted for pre-sampling, so as to have a preliminary understanding of the particulate matter concentration level, particulate matter type and characteristics, environmental factor influence, and pollution source situation in the sampling area. Then, during the formal sampling process, the single-layer filter membrane clip 85 is removed to ensure the smooth progress of the subsequent sampling process. Then, under the action of the spring 87, the top of the sampling tube 7 is fully in contact with the inner wall of the top of the rotating top cover 81 to ensure airtightness and avoid contamination. When the sampling tube 7 is inserted into the through hole 810 and is correspondingly connected to the sampling head 82 or the through hole 810, at this time, under the action of the spring 87, the adjustment component 8 sinks. At this time, the push rod 88 deflects, driving the two arc-shaped clamping blocks 89 to move directionally, so that the arc-shaped clamping blocks 89 clamp the sampling tube 7 to further ensure the stability during actual use;

[0054] During the actual use process, through the setting of the through hole 810 on the adjustment component 8, the sampling head 82 with the same diameter is effectively and correspondingly connected to the sampling tube 7 to ensure the smoothness of the internal channel, facilitate sampling, and effectively and conveniently switch during the airtightness detection process and the sampling process, providing effective convenience for the pre-preparation stage and the sampling process of the actual sampling process.

[0055] Finally, it should be noted that in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0056] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sampler with an automatic airtightness detection function, comprising a housing (1), a side of the housing (1) being rotatably provided with an opening and closing door (11), a sampling box (2) for storing samples, and a negative pressure machine (10) for performing negative pressure extraction on the inside of the sampling box (2), a control center (5) for control is also provided inside the housing (1), characterized in that: A sampling tube (7) connected to the sampling box (2) is provided on one side of the top end of the housing (1), and an adjustment component (8) for cooperating with the sampling tube (7) is rotatably provided on the top end of the housing (1); The adjustment assembly (8) comprises a rotating top cover (81), a circular groove is provided at the bottom end of the rotating top cover (81), and a telescopic shaft (86) is fixedly connected at the center of the groove, one end of the telescopic shaft (86) extends through the inside of the housing (1), and two groups of through holes (810) are provided at the top end of the rotating top cover (81), and a sampling head (82) of the same diameter is connected to the top end of one group of through holes (810), and the top end of the sampling tube (7) contacts the rotating top cover (81) at the inner wall of the top end of the rotating top cover (81), and the sampling tube (7) is adapted to the through holes (810); The sampling box (2) is provided with an air pressure sensor module and a timer module, both of which are electrically connected to the control center (5), and the control center (5) is electrically connected to the negative pressure machine (10). The control center (5) is also provided with an alarm module.

2. A sampler with automatic airtightness detection function according to claim 1, characterized in that: The rotating top cover (81) extends through the inner end of the outer shell (1) and is connected to a baffle. A spring (87) is sleeved on the outer side. The two ends of the spring (87) respectively contact the inner wall of the top end of the outer shell (1) and the baffle.

3. A sampler with automatic airtightness detection function according to claim 2, characterized in that: Two groups of arc-shaped clamping blocks (89) are slidably provided at the bottom end of the rotating top cover (81), and the gaps between the two groups of arc-shaped clamping blocks (89) and the inner wall of the rotating top cover (81) form an annular sliding groove adapted to the sampling tube (7); The arc-shaped clamping block (89) is provided with an arc notch which is directly opposite to the penetration hole (810), and the arc-shaped notch is adapted to the sampling tube (7). The arc-shaped clamping block (89) is directional and moves in the direction in which the axis of the notch points to the axis of the corresponding penetration hole (810); A pushing rod (88) is hinged between the arc-shaped clamping block (89) and the telescopic shaft rod (86).

4. The sampler with automatic airtightness detection function according to claim 3, characterized in that: The circumferential side surface of the rotating top cover (81) is provided with two groups of slots connected to the through holes (810), and a blocking plate (84) is inserted into the slots away from the sampling head (82); A single-layer filter membrane clip (85) is inserted into the rotating top cover (81) at a slot corresponding to the sampling head (82).

5. The sampler with automatic airtightness detection function according to claim 1, characterized in that: Two groups of holding rings (83) are symmetrically arranged on the peripheral side of the rotating top cover (81).

6. The sampler with automatic airtightness detection function according to claim 1, characterized in that: A top partition (6) is provided on the inner side of the top end of the shell (1), and the bottom end of the telescopic shaft (86) penetrates the shell (1) and extends to the inside of the top partition (6); The bottom of one end of the telescopic shaft (86) located inside the top compartment (6) is coaxially connected to a plug-in prism (811), and a control motor (12) with an output shaft pointing vertically upward is provided inside the top compartment (6), and a synchronous shaft sleeve (13) is coaxially connected to the top of the control motor (12), and a prism slot adapted to the plug-in prism (811) is provided on the synchronous shaft sleeve (13), and the control motor (12) is electrically connected to the control center (5).

7. The sampler with automatic airtightness detection function according to claim 1, characterized in that: The housing (1) is further provided with a filter membrane clamp assembly (4) which is connected to the sampling box (2), and the filter membrane clamp assembly (4) is provided with multiple layers of filter membrane clamps; A filter membrane clamp assembly controller (3) for controlling the filter membrane clamp assembly (4) is also provided inside the housing (1).

8. The sampler with automatic airtightness detection function according to claim 1, characterized in that: A support rod (9) corresponding to the sampling tube (7) is symmetrically arranged on the other side of the top of the housing (1), and the diameter of the support rod (9) is the same as that of the sampling tube (7), and the height of the support rod (9) is the same as the height of the sampling tube (7) extending to the top of the housing (1).

9. The sampler with automatic airtightness detection function according to claim 1, characterized in that: The air pressure sensor is located inside the sampling box (2) and is used to detect the air pressure inside the sampling box (2) during the air tightness detection process. The air pressure sensor module is electrically connected to the timer module. When the air pressure inside the sampling box (2) reaches a certain level during the air tightness detection process, the timer module will be triggered. During this process, the air pressure sensor module will feed back a signal to the control center (5). The control center (5) controls the negative pressure machine (10) to be turned off, and then the timer module will count down. After the countdown is completed, the timer module will send a signal to the control center (5). During the countdown process, if the timer module does not send a signal to the control center (5), if the value detected by the air pressure sensor module decreases, it indicates that the internal air tightness is insufficient. At this time, the control center (5) controls the alarm module to issue a warning, thereby achieving the purpose of air tightness detection; on the contrary, when the timer module counts down and the value detected by the air pressure sensor module does not change, it indicates that the internal air tightness of the sampling box (2) is intact and the subsequent sampling process can be carried out.

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