Comprehensive sampling device for atmospheric particulates

Abstract

The invention relates to the technical field of atmospheric particulate matter sampling, and discloses an atmospheric particulate matter comprehensive sampling device which comprises a collecting device and further comprises a mounting seat and a sampling device, the mounting pipe is fixed on the bottom surface of the mounting seat; the mounting cylinder is fixed on the top surface of the mounting seat; the air inlet is formed in the top surface of the mounting cylinder; the fixed bracket is fixed on the mounting seat; the sampling assembly is arranged in the mounting cylinder; and the driving assembly is arranged on the mounting seat. According to the invention, the time-sharing sampling of atmospheric particulates can be realized according to the periodic starting of the motor, and the atmospheric particulates can be sampled by taking hour as a unit through the design of starting once per hour, so that the time interval change in the sampling process is captured, the temporal-spatial resolution of a monitoring result is improved, and the monitoring accuracy is improved. And the monitoring data is more representative.

Description

Technical Field

[0001] The invention relates to the technical field of atmospheric particle sampling, and in particular to a comprehensive atmospheric particle sampling device. Background Art

[0002] The atmospheric particulate matter comprehensive sampling device is a device used to monitor the concentration and composition of suspended particulate matter in the atmosphere. These devices usually consist of multiple parts, including sampling heads, flow controllers, filter membranes, sample collectors, data recorders, etc. Its working principle is to draw air into the device so that the particles are captured on the filter membrane or other collection media, and then the collected particles are analyzed.

[0003] After searching, the Chinese patent with the announcement number CN205404215U discloses an atmospheric particulate sampler, comprising: a main body, which is a hollow cylindrical structure with an opening at the upper end; a processor, which is arranged inside the main body and is used to collect and process particulate matter in the air; a rotating part, which is a toroidal structure, has the same outer diameter as the main body, and is connected to the upper end of the main body; an air inlet, which is a cylinder with the same outer diameter as the rotating part, and is fixedly connected to the upper surface of the rotating part, and an air inlet is provided on the side surface of the air inlet, and the air inlet further includes a vent pipe, one end of the vent pipe is connected to the air inlet, and the other end is connected to the processor; a controller, which is arranged inside the main body and is connected to the rotating part. The atmospheric particulate sampler of the above scheme is provided with a rotating part, which can adjust the direction of the air inlet according to the change of wind direction, does not require manual supervision, and can respond to changes in wind direction in a timely manner, thereby improving the collection efficiency. However, the above scheme still has the following shortcomings when it is actually used: The atmospheric particle sampling device proposed in the above scheme cannot divide the time period for sampling atmospheric particulate matter when sampling atmospheric particulate matter. Since the time period for sampling particulate matter cannot be divided, the device cannot capture the change of particulate matter concentration in the atmosphere over time, which makes the monitoring results lack time period information and cannot fully reflect the daily and seasonal changes in the concentration of atmospheric pollutants. Trends, in addition, because it is impossible to clearly express the amount of particulate matter in the atmosphere in each time period, the monitoring results may not be representative. In certain time periods, particulate matter emissions from specific sources may have a significant impact on the concentration, but because the device cannot distinguish these time periods, it may lead to deviations in the monitoring results. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a comprehensive sampling device for atmospheric particulate matter.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An atmospheric particulate matter comprehensive sampling device comprises a collection device and further comprises: Mounting seat; A mounting tube, the mounting tube being fixed to the bottom surface of the mounting seat; A mounting tube, the mounting tube being fixed to the top surface of the mounting seat; An air inlet, the air inlet being opened on the top surface of the mounting tube; A fixed bracket, wherein the fixed bracket is fixed on the mounting seat; A sampling assembly, the sampling assembly is arranged inside the mounting cylinder; A drive assembly is arranged on a mounting seat.

[0006] As a preferred technical solution of the present invention, the sampling component comprises: A rotating disk, the rotating disk is placed inside the mounting cylinder; A plurality of sampling cylinders, wherein the plurality of sampling cylinders are arranged on a rotating disk, and the plurality of sampling cylinders are distributed in a circumferential array around the center position of the rotating disk; A flow guide tube, the flow guide tube is fixed inside the air inlet, and the flow guide tube is arranged directly opposite to one of the sampling tubes; A plurality of sampling membranes are respectively arranged in a plurality of sampling tubes.

[0007] As a preferred technical solution of the present invention, the driving assembly includes: A motor, wherein the motor is mounted on a fixed bracket; A rotating shaft, one end of which is rotatably mounted on a fixed bracket, and the other end of which is fixedly connected to a rotating disk; A rotating plate, wherein the rotating plate is fixedly sleeved on the rotating shaft; A plurality of grooves, wherein the plurality of grooves are arranged on the rotating plate, and the plurality of grooves are distributed in a circumferential array around the center position of the rotating plate; A rotating seat, wherein the rotating seat is fixed on the output shaft of the motor; Two driving rods are fixed on the rotating seat, and one of the driving rods is placed in one of the grooves.

[0008] As a preferred technical solution of the present invention, four support rods are fixed on the collection device, and a rain shield is commonly fixed to the top ends of the four support rods.

[0009] As a preferred technical solution of the present invention, a shielding component and a triggering component are provided on the top surface of the mounting tube, and the shielding component includes: A rotating block, the rotating block is rotatably mounted at a middle position of the top surface of the mounting cylinder; A shielding plate, wherein the shielding plate is fixed on the outer peripheral surface of the rotating block; A limit block is fixed on the top surface of the installation cylinder.

[0010] As a preferred technical solution of the present invention, the trigger component includes: A rain collecting box, wherein the rain collecting box is fixed on the top surface of the rain shield; A sealing cylinder, wherein the sealing cylinder is fixed on the top surface of the mounting cylinder and has an arc-shaped structure; A connecting pipe, one end of which is connected to the rain collecting box, and the other end of which is connected to the sealing cylinder; A water-absorbing expansion block, which is placed inside the sealing cylinder and is made of a water-swelling waterstop strip; A slider, the slider being slidably disposed inside the sealing cylinder; An arc-shaped push rod, one end of which is fixedly connected to the slider, and the other end of which is fixedly connected to the shielding plate; The air hole is arranged on the sealing cylinder.

[0011] As a preferred technical solution of the present invention, the side surface of the sliding block and the inner surface of the sealing cylinder are in contact with each other.

[0012] As a preferred technical solution of the present invention, the shape of the water-absorbing and expanding block is matched with the shape of the sealing tube, and there is a gap between the outer surface of the water-absorbing and expanding block and the inner surface of the sealing tube.

[0013] As a preferred technical solution of the present invention, a guide block is fixed to the top surface of the rain shield, and the top end of the guide block is smaller than the bottom end.

[0014] As a preferred technical solution of the present invention, the groove is adapted to the shape of the driving rod.

[0015] The present invention has the following beneficial effects: 1. The device can realize time-sharing sampling of atmospheric particulate matter according to the periodic start-up of the motor. By starting once every hour, the atmospheric particulate matter can be sampled in units of hours, so that the time period changes in the sampling process can be captured, which helps to improve the temporal and spatial resolution of the monitoring results and make the monitoring data more representative. In addition, time-sharing sampling can ensure the accuracy of subsequent detection. By attaching the sampling membranes to several sampling tubes one by one, it can effectively avoid the mixing of particles in different time periods, improve the accuracy of sampling, and make subsequent analysis more reliable. Secondly, time-sharing sampling makes the monitoring data of different time periods comparable. Since the sampling data of different time periods can be clearly divided, it is conducive to the comparative analysis of subsequent data and helps researchers better understand the temporal and spatial distribution of atmospheric pollutants. 2. The design of the rain shield and the shielding component can effectively prevent rainwater from entering the installation tube. On rainy days, the rain shield plays a role in shielding rainwater, while the shielding component is controlled by a mechanical structure without the help of a sensor. It can timely shield the air inlet when it rains, preventing rainwater from entering the sampling device, ensuring the accuracy and reliability of sampling. In addition, the design of the sampling device takes into account the adaptability in windy and rainy conditions. Since the rain shield cannot completely block all rainwater, the shielding component can be triggered and shield the air inlet in time on rainy days. Even in severe weather conditions, it can effectively protect the sampling device from interference from rainwater, ensuring the reliability of sampling data; 3. The trigger component is controlled by a mechanical structure, and no sensor is required to achieve triggering. This design simplifies the control system of the device, reduces the complexity of components and the possibility of failure, and improves the reliability and stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a comprehensive sampling device for atmospheric particulate matter proposed by the present invention; Figure 2 It is a structural schematic diagram of a mounting seat, a mounting tube and a mounting cylinder; Figure 3 It is a schematic diagram of the internal structure of the installation cylinder; Figure 4 It is a schematic diagram of the cross-sectional structure of the installation tube; Figure 5 for Figure 1 A magnified view of the structure at A; Figure 6 is a schematic diagram of the structure of the drive component; Figure 7 It is a schematic diagram of the cross-sectional structure of the sealing cylinder; Figure 8 It is a schematic diagram of the structure of the rain shield, rain collecting box and guide block.

[0017] In the figure: 1 collection device, 2 mounting seat, 3 mounting tube, 4 mounting cylinder, 5 air inlet, 6 fixed bracket, 71 rotating disk, 72 sampling cylinder, 73 guide tube, 74 sampling membrane, 81 motor, 82 rotating shaft, 83 rotating plate, 84 groove, 85 rotating seat, 86 driving rod, 9 supporting rod, 10 rain shield, 111 rotating block, 112 shielding plate, 113 limiting block, 121 rain collecting box, 122 sealing cylinder, 123 connecting pipe, 124 water absorption expansion block, 125 slider, 126 arc push rod, 127 air hole, 13 guide block. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Reference Figure 1-8 , a comprehensive sampling device for atmospheric particulate matter, including a collection device 1, an air pump is installed inside the collection device 1, the specific structure and working principle of the collection device 1 are not the innovative part of the present technical solution, are not shown in the figure, and will not be described in detail here, and is used for air extraction, and also includes: a mounting seat 2; a mounting tube 3, the mounting tube 3 is fixed to the bottom surface of the mounting seat 2; a mounting tube 4, the mounting tube 4 is fixed to the top surface of the mounting seat 2; an air inlet 5, the air inlet 5 is opened on the top surface of the mounting tube 4; a fixing bracket 6, the fixing bracket 6 is fixed to the mounting seat 2; The device also includes a sampling assembly, which is arranged inside the mounting tube 4. The sampling assembly includes: a rotating disk 71, which is placed inside the mounting tube 4; a plurality of sampling tubes 72, which are all arranged on the rotating disk 71, and are distributed in a circumferential array around the center of the rotating disk 71; a flow guide tube 73, which is fixed inside the air inlet 5 and is arranged opposite to one of the sampling tubes 72; a plurality of sampling membranes 74, which are respectively arranged in the plurality of sampling tubes 72. In the initial state, the flow guide tube 73 is arranged opposite to one of the sampling tubes 72. At this time, the airflow in the external environment will enter the interior of the mounting tube 4 through the flow guide tube 73 and flow into the corresponding sampling tube 72. In this process, the particulate matter in the atmosphere will adhere to the sampling membrane 74 in the sampling tube 72, so that the sampling of the atmospheric particulate matter can be achieved. The device also includes a driving assembly, which is arranged on the mounting seat 2. The driving assembly includes: a motor 81, which is mounted on the fixed bracket 6. During the sampling process, the motor 81 is periodically started and drives the rotating disk 71 to rotate through the driving assembly, so that the plurality of sampling tubes 72 are periodically aligned with the guide tube 73. Therefore, the particles in the atmosphere will adhere to the plurality of sampling membranes 74 in the plurality of sampling tubes 72 one by one; a rotating shaft 82, one end of which is rotatably mounted on the fixed bracket 6, and the other end of which is fixedly connected to the rotating disk 71; a rotating plate 83, which is fixedly sleeved on the rotating shaft 82; and a plurality of grooves 84, which are all provided on the rotating plate 83, and the plurality of grooves 84 are arranged in a circumferential array around the center position of the rotating plate 83. Distribution; rotating seat 85, the rotating seat 85 is fixed on the output shaft of the motor 81; two driving rods 86, the two driving rods 86 are fixed on the rotating seat 85, one of the driving rods 86 is placed in one of the grooves 84, the groove 84 is adapted to the shape of the driving rod 86, the motor 81 can drive the rotating seat 85 to rotate when it is running, so that the rotating seat 85 drives the two driving rods 86 to rotate, and during the rotation of the two driving rods 86, one of the driving rods 86 can move into the corresponding groove 84, and push the rotating plate 83 to rotate through the groove 84, when the rotating plate 83 rotates, it can drive the rotating shaft 82 to rotate, and the rotating disk 71 will also rotate accordingly, and when the rotating disk 71 rotates, it can drive a number of sampling tubes 72 to rotate, so that the position conversion of a number of sampling tubes 72 can be realized; Four support rods 9 are fixed on the collection device 1, and a rain shield 10 is commonly fixed on the top of the four support rods 9. A guide block 13 is fixed on the top surface of the rain shield 10. The top size of the guide block 13 is smaller than the bottom size. The rain shield 10 can shield the installation tube 4 from rainwater, and prevent rainwater from entering the interior of the installation tube 4 through the guide pipe 73 on rainy days. A shielding component and a triggering component are provided on the top surface of the installation tube 4. The shielding component includes: a rotating block 111, which is rotatably installed in the middle position of the top surface of the installation tube 4; a shielding plate 112, which is fixed on the outer peripheral surface of the rotating block 111; a limit block 113, which is fixed on the top of the installation tube 4 The trigger assembly includes: a rain collecting box 121, which is fixed to the top surface of the rain shield 10; a sealing cylinder 122, which is fixed to the top surface of the mounting cylinder 4, and the sealing cylinder 122 is an arc-shaped structure; a connecting pipe 123, one end of which is connected to the rain collecting box 121, and the other end is connected to the sealing cylinder 122; a water-absorbing expansion block 124, which is placed inside the sealing cylinder 122, and the water-absorbing expansion block 124 is made of a water-swelling water stop strip, and the shape of the water-absorbing expansion block 124 is adapted to the shape of the sealing cylinder 122, and there is a gap between the outer surface of the water-absorbing expansion block 124 and the inner surface of the sealing cylinder 122; a slider 125, which is 125 is slidably arranged inside the sealing cylinder 122, and the side surface of the slider 125 fits with the inner surface of the sealing cylinder 122; an arc-shaped push rod 126, one end of which is fixedly connected to the slider 125, and the other end of which is fixedly connected to the shielding plate 112; the water-absorbing and expanding block 124 adopts a water-swelling water-stopping strip, which is a special rubber product that can produce 2-3 times of deformation after absorbing water. Therefore, when the water-absorbing and expanding block 124 absorbs water, the water-absorbing and expanding block 124 can expand and deform, and extend inside the sealing cylinder 122. When the water-absorbing and expanding block 124 extends, it can push the slider 125 to move, and the sliding block 124 can move. When block 125 moves, it can push the baffle plate 112 through the arc-shaped push rod 126, so that the baffle plate 112 rotates around the rotating block 111 until the baffle plate 112 contacts the limit block 113. When the baffle plate 112 contacts the limit block 113, the baffle plate 112 completely blocks the air inlet 5, thereby preventing rainwater from entering the interior of the installation tube 4 on rainy days; the air hole 127, the air hole 127 is opened on the sealing tube 122, and the slider 125 can draw air from the external environment into the interior of the sealing tube 122 through the air hole 127 when moving. The setting of the air hole 127 enables the air pressure inside and outside the sealing tube 122 to maintain balance, which is conducive to the smooth movement of the slider 125.

[0020] The specific working principle of the present invention is as follows: When the comprehensive sampling device for atmospheric particulate matter proposed by the present invention is in use, in the initial state, the guide tube 73 is arranged opposite to one of the sampling tubes 72. At this time, the airflow in the external environment will enter the interior of the mounting tube 4 through the guide tube 73 and flow into the corresponding sampling tube 72. In this process, the particles in the atmosphere will adhere to the sampling film 74 in the sampling tube 72, and the sampling of atmospheric particulate matter can be achieved. During the sampling process, the motor 81 is started periodically, and the rotating disk 71 is driven to rotate by the driving assembly, so that the plurality of sampling tubes 72 are periodically aligned with the guide tube 73. Therefore, the particles in the atmosphere will adhere to the plurality of sampling films 74 in the plurality of sampling tubes 72 one by one. Specifically, the motor 81 is started once per hour, and the device can perform time-sharing sampling of atmospheric particulate matter in units of hours, so as to ensure the accuracy of subsequent detection. When the motor 81 is running, it can drive the rotating seat 85 to rotate, so that the rotating seat 85 drives the two driving rods 86 to rotate. During the rotation of the two driving rods 86, one of the driving rods 86 can move into the corresponding groove 84 and push the rotating plate 83 to rotate through the groove 84. When the rotating plate 83 rotates, it can drive the rotating shaft 82 to rotate, and the rotating disk 71 will also rotate accordingly. When the rotating disk 71 rotates, it can drive the plurality of sampling tubes 72 to rotate, so as to realize the position conversion of the plurality of sampling tubes 72. Specifically, the start and stop time and control method of the motor 81 are prior arts, and are not an innovative part of the present technical solution. They are not shown in the figure and will not be described in detail here. The collection device 1 is also provided with four support rods 9 and a rain shield 10. The rain shield 10 can shield the installation tube 4 from rainwater, and prevent rainwater from entering the interior of the installation tube 4 through the guide pipe 73 on rainy days. When it rains, rainwater will flow into the interior of the rain collecting box 121 along the inclined surface of the guide block 13, and accumulate in the interior of the rain collecting box 121. Then, the rainwater will enter the interior of the sealing tube 122 through the connecting pipe 123, and be absorbed by the water-absorbing expansion block 124. The water-absorbing expansion block 124 adopts a water-swelling water stop strip. The water-swelling water stop strip is a special rubber product. It can produce 2-3 times of deformation after absorbing water. Therefore, when the water-absorbing expansion block 124 absorbs water, the water-absorbing expansion block 124 can expand and deform, and accumulate in the sealing tube 12 2, the water-absorbing expansion block 124 can push the slider 125 to move when it extends, and the slider 125 can push the shielding plate 112 through the arc push rod 126 when it moves, so that the shielding plate 112 rotates around the rotating block 111 until the shielding plate 112 contacts the limit block 113. When the shielding plate 112 contacts the limit block 113, the shielding plate 112 completely blocks the air inlet 5, thereby preventing rainwater from entering the interior of the installation tube 4 on rainy days. Since it is often windy on rainy days, rainwater will tilt and fall under the action of wind, so the rain shield 10 cannot block all rainwater, and the design of the shielding component can effectively solve this problem. In addition, the trigger component is controlled by a mechanical structure, and there is no need to use a sensor to achieve triggering; After the sampling is completed, the staff removes the mounting seat 2 from the collection device 1 and transfers the several sampling tubes 72 inside the mounting tube 4 to the test site. During this process, the staff can manually control the rotation of the shielding plate 112 and use the shielding plate 112 to block the air inlet 5, so as to prevent the air in the external environment from entering the interior of the sampling tube 72 during the transfer of the sampling tube 72. This design provides a guarantee for the subsequent detection accuracy. When the staff manually pulls the shielding plate 112, the shielding plate 112 can drive the slider 125 to move through the arc push rod 126. When the slider 125 moves, it can draw the air in the external environment into the interior of the sealing tube 122 through the air hole 127. The setting of the air hole 127 allows the air pressure inside and outside the sealing tube 122 to be balanced, which is conducive to the smooth movement of the slider 125. The comprehensive advantages of this solution are reflected in many aspects: First, the sampling device realizes time-sharing sampling of atmospheric particulate matter through the periodic start-up of the motor. The design of starting once every hour enables the sampling process to capture time period changes, improves the temporal and spatial resolution and representativeness of the monitoring results, and time-sharing sampling ensures the accuracy of subsequent detection and avoids the mixing of particles in different time periods, thereby improving the accuracy of sampling and the reliability of subsequent analysis. In addition, time-sharing sampling also makes the monitoring data of different time periods comparable, which is conducive to the comparative analysis of subsequent data and helps to better understand the temporal and spatial distribution of atmospheric pollutants. Secondly, the device is designed with rain shields and shielding components to effectively prevent rainwater from entering the installation cylinder and block rain. The structural design of the plate and shielding assembly takes into account the adaptability in windy and rainy conditions. It can timely shield the air inlet when it rains, ensuring the accuracy and reliability of sampling, while avoiding the interference of rain on the sampling device. This design simplifies the control system of the device, eliminates the need for sensors, reduces the complexity of components and the possibility of failure, and improves the reliability and stability of the device. In summary, the design of this scheme takes into account multiple key factors, including the accuracy and comparability of time-sharing sampling, and protection functions under severe weather conditions. At the same time, the reliability and stability of the device are improved by simplifying the control system, thereby providing a reliable and efficient solution for atmospheric particulate matter monitoring.

[0021] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A comprehensive sampling device for atmospheric particulate matter, comprising a sampling device (1), characterized in that: Also includes: Mounting seat (2); A mounting tube (3), wherein the mounting tube (3) is fixed to the bottom surface of the mounting seat (2); A mounting tube (4), wherein the mounting tube (4) is fixed on the top surface of the mounting seat (2); An air inlet (5), the air inlet (5) being disposed on the top surface of the mounting tube (4); A fixed bracket (6), wherein the fixed bracket (6) is fixed on the mounting seat (2); A sampling assembly, the sampling assembly being arranged inside the mounting cylinder (4); A drive assembly is arranged on a mounting seat (2).

2. The comprehensive sampling device for atmospheric particulate matter according to claim 1 is characterized in that: The sampling assembly comprises: A rotating disk (71), wherein the rotating disk (71) is disposed inside the mounting cylinder (4); A plurality of sampling barrels (72), wherein the plurality of sampling barrels (72) are all disposed on the rotating disk (71), and the plurality of sampling barrels (72) are distributed in a circumferential array around a central position of the rotating disk (71); A flow guide tube (73), the flow guide tube (73) being fixed inside the air inlet (5), and the flow guide tube (73) being arranged directly opposite to one of the sampling tubes (72); A plurality of sampling membranes (74), wherein the plurality of sampling membranes (74) are respectively arranged in a plurality of sampling tubes (72).

3. The comprehensive sampling device for atmospheric particulate matter according to claim 2 is characterized in that: The drive assembly comprises: A motor (81), wherein the motor (81) is mounted on a fixed bracket (6); a rotating shaft (82), one end of the rotating shaft (82) being rotatably mounted on the fixed bracket (6), and the other end of the rotating shaft (82) being fixedly connected to the rotating disk (71); A rotating plate (83), wherein the rotating plate (83) is fixedly sleeved on the rotating shaft (82); a plurality of grooves (84), wherein the plurality of grooves (84) are all formed on the rotating plate (83), and the plurality of grooves (84) are distributed in a circumferential array around a central position of the rotating plate (83); A rotating seat (85), wherein the rotating seat (85) is fixed on an output shaft of the motor (81); Two driving rods (86), both of which are fixed on the rotating seat (85), and one of the driving rods (86) is placed in one of the grooves (84).

4. A comprehensive sampling device for atmospheric particulate matter according to any one of claims 1 to 3, characterized in that: Four support rods (9) are fixed on the collection device (1), and a rain shield (10) is commonly fixed to the top ends of the four support rods (9).

5. The comprehensive sampling device for atmospheric particulate matter according to claim 4 is characterized in that: The top surface of the mounting tube (4) is provided with a shielding component and a triggering component, and the shielding component comprises: A rotating block (111), the rotating block (111) being rotatably mounted at a middle position of a top surface of the mounting cylinder (4); A shielding plate (112), wherein the shielding plate (112) is fixed on the outer peripheral surface of the rotating block (111); A limit block (113), wherein the limit block (113) is fixed on the top surface of the mounting tube (4).

6. The comprehensive sampling device for atmospheric particulate matter according to claim 5 is characterized in that: The trigger component comprises: A rain collecting box (121), wherein the rain collecting box (121) is fixed on the top surface of the rain shield (10); A sealing cylinder (122), wherein the sealing cylinder (122) is fixed on the top surface of the mounting cylinder (4), and the sealing cylinder (122) is an arc-shaped structure; A connecting pipe (123), one end of the connecting pipe (123) being connected to the rain collecting box (121), and the other end of the connecting pipe (123) being connected to the sealing cylinder (122); A water-absorbing expansion block (124), the water-absorbing expansion block (124) being placed inside the sealing cylinder (122), the water-absorbing expansion block (124) being made of a water-swelling water stop strip; A sliding block (125), wherein the sliding block (125) is slidably disposed inside the sealing cylinder (122); An arc-shaped push rod (126), one end of the arc-shaped push rod (126) being fixedly connected to the slider (125), and the other end of the arc-shaped push rod (126) being fixedly connected to the shielding plate (112); An air hole (127), wherein the air hole (127) is formed on the sealing cylinder (122).

7. The comprehensive sampling device for atmospheric particulate matter according to claim 6 is characterized in that: The side surface of the sliding block (125) and the inner surface of the sealing cylinder (122) are in contact with each other.

8. The comprehensive sampling device for atmospheric particulate matter according to claim 6 is characterized in that: The shape of the water-absorbing and expanding block (124) matches the shape of the sealing cylinder (122), and a gap is provided between the outer surface of the water-absorbing and expanding block (124) and the inner surface of the sealing cylinder (122).

9. The comprehensive sampling device for atmospheric particulate matter according to claim 4, characterized in that: A guide block (13) is fixed to the top surface of the rain shield (10), and the top end of the guide block (13) is smaller than the bottom end.

10. The comprehensive sampling device for atmospheric particulate matter according to claim 3, characterized in that: The groove (84) is adapted to the shape of the driving rod (86).

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