Air sampling device capable of filtering particulate matters

Abstract

The utility model discloses an air sampling device capable of filtering particulate matters, which comprises a collecting box, a filtering mechanism is arranged in the collecting box, an impurity removing device is arranged in the collecting box, and the impurity removing device comprises two accommodating cylinders which are fixedly connected to the inner wall of the collecting box; the piston is inserted into the inner wall of the accommodating cylinder; one end of the first electric valve is mounted on the outer wall of the accommodating cylinder; the first air outlet pipe is communicated with the other end of the first electric valve. The utility model relates to the technical field of air collection capable of filtering particulate matters, through the cooperation among the accommodating cylinder, the piston and the first electrically operated valve, when outside air is collected, the collection box is firstly placed outdoors, then the air inlet part and the cleaning unit are closed, and the first electrically operated valve is opened; a person manually pushes the piston to the other side of the containing cylinder, in the pushing process, air in the containing cylinder can be exhausted through the first air outlet pipe, and then the first electric valve is closed.

Description

Technical Field

[0001] This utility model relates to the field of air collection technology that can filter particulate matter, specifically to an air sampling device that can filter particulate matter. Background Technology

[0002] The rapid development of industry has led to an increase in industrial gas emissions. Air pollution can affect people's health, especially the atmospheric environment in factories. Therefore, it is very important to monitor air pollution and collect ambient air samples for monitoring. When collecting ambient air samples, it is necessary to use collection devices.

[0003] Existing air sampling devices collect ambient air by placing a container outdoors and then collecting the air using a collection device. The air is then tested. For example, an ambient air sampling device with application number "CN202320209943.X" includes a sampling device body and an air intake assembly located on the sampling device body. The air intake assembly includes a mounting plate, with a liftable sampling tube located above the mounting plate via a drive component. The sampling tube contains an air chamber, and air inlets communicating with the air chamber are evenly distributed along its circumference on the outer wall of the sampling tube. A conduit communicating with the air chamber is located at the lower end of the sampling tube, and the conduit is connected to the sampling device body via an air intake hose. This structure, with air inlets arranged circumferentially around the sampling tube, allows ambient air from around the tube to enter the sampling tube through air inlets at different locations, thus improving the ambient air sampling effect.

[0004] However, existing air sampling devices simply place the container outdoors and collect the air through the collection device. But because the container may contain residual air from previous exposures, the air from the two different areas mixes together, resulting in inaccurate test results. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an air sampling device that can filter particulate matter. This solves the problem that when collecting outdoor air, the container is placed outdoors and the sample is collected by a collection device. However, because the container may contain residual air from previous samples, the air from the two different areas mixes together, resulting in inaccurate test results.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an air sampling device capable of filtering particulate matter, comprising a sampling box, wherein a filtering mechanism is provided inside the sampling box, and a purification device is provided inside the sampling box, the purification device comprising: two receiving cylinders, both fixedly connected to the inner wall of the sampling box; a piston inserted into the inner wall of the receiving cylinder, with one end extending to the outside of the sampling box; a first electric valve, one end of which is installed on the outer wall of the receiving cylinder; a first air outlet pipe connected to the other end of the first electric valve and extending out of the sampling box; an air inlet located on the outer side of the receiving cylinder; and a cleaning unit located outside the air inlet; wherein, by pushing the piston, impurity air inside the receiving cylinder is discharged through the first electric valve and the first air outlet pipe, the air inlet draws external air into the receiving cylinder, and the cleaning unit cleans the impurity air inside the air inlet.

[0007] Preferably, the air intake includes: two second electric valves, one end of which is respectively installed on one side of the outer wall of the two receiving cylinders; a bidirectional pipe, both ends of which are respectively connected to the other ends of the two second electric valves; and an air pump, the output end of which is connected to one side of the bidirectional pipe and fixedly connected to the inner wall of the collection box; wherein, when the second electric valve is opened, the air pump draws external air into the receiving cylinder through the bidirectional pipe.

[0008] Preferably, the cleaning unit includes: a third electric valve, one end of which is installed on the outer wall of the bidirectional pipe away from the air pump; and a second air outlet pipe, which is connected to the other end of the third electric valve and extends to the outside of the collection box; wherein, when the first electric valve and the second electric valve are closed and the third electric valve is opened, the impurity air inside the air inlet is discharged through the air pump and the second air outlet pipe.

[0009] Preferably, the filtration mechanism includes: a filter box connected to the input end of the air pump; a clamp fixedly connected to the inner wall of the filter box; a filter plate slidably clamped to the inner wall of the clamp; filter cotton adhering to the inner wall of the filter plate; and a stop block rotatably connected to the inner wall of the filter plate via a pin and adhering to the surface of the filter cotton. The filter box is used to install the clamp, and the clamp's engagement with the filter plate facilitates the disassembly of the filter plate. The filter cotton filters particulate matter in the air, and the stop block restricts the flow of the filter cotton.

[0010] Preferably, the back of the collection box is provided with an adjustment part, the adjustment part comprising: a base, disposed below the collection box; a straight cylinder, fixed to the inner wall of the base by bolts; a rotating rod, rotatably connected to the inner wall of the straight cylinder via a sealed bearing; a first bevel gear, fixedly connected to one end of the rotating rod located inside the straight cylinder; a second bevel gear, meshing with the outer wall of the first bevel gear; a screw, one end fixedly connected to the inner wall of the second bevel gear, and the other end rotatably connected to the inner wall of the straight cylinder via a sealed bearing; and a lifting component, threadedly connected to the screw. The outer wall of the base is movably connected to the front opening of the straight cylinder and fixed to the back of the collection box by bolts; a crank is inserted into the inner wall of the rotating rod; a limiting unit is disposed on the top of the base; wherein, the base mounts the straight cylinder, and the straight cylinder mounts and protects the rotating rod, the first bevel gear, the second bevel gear, the screw, and the lifting component. Shaking the crank causes the rotating rod to rotate, which in turn drives the screw to rotate through the first and second bevel gears, causing the lifting component to lift the collection box. The limiting unit restricts the rotating rod.

[0011] Preferably, the limiting unit includes: a sleeve, fixedly connected to the top of the base; a spring, installed on the inner wall of the sleeve, and fixedly connected at the bottom to the top of the base; a fixing member, fixedly connected at the bottom to the bottom of the spring, inserted at the top into the bottom groove of the rotating rod, and movably connected to the outer wall of the sleeve with openings on both sides; wherein, the sleeve mounts the spring, the spring provides force to the fixing member inserted into the bottom groove of the rotating rod, and the fixing member fixes the rotating rod.

[0012] Beneficial effects

[0013] This invention provides an air sampling device capable of filtering particulate matter. It offers the following advantages: Through the cooperation of a receiving cylinder, a piston, and a first electric valve, when collecting air from the outside, the sampling box is first placed outdoors. Then, the air inlet and cleaning unit are closed, and the first electric valve is opened. A person manually pushes the piston to the other side of the receiving cylinder. During this pushing process, the air inside the receiving cylinder is discharged through the first air outlet pipe. Afterward, the first electric valve is closed, and the outside air is collected through the air inlet. This ensures that the receiving cylinder contains only the air collected at that moment, guaranteeing the accuracy of the air sample.

[0014] By utilizing the coordination between the straight cylinder, rotating rod, and crank, when it is necessary to collect and compare air samples at different heights, the crank is turned. The crank drives the rotating rod to rotate, which in turn drives the first bevel gear. The first bevel gear drives the second bevel gear, which in turn drives the screw. The screw drives the lifting component to move up and down, which in turn moves the collection box up and down. When collecting air samples from lower altitudes, one second electric valve needs to be opened and another closed. After the air from the lower altitudes has been collected, the previously opened second electric valve is closed, and the other second electric valve is opened, thus allowing the collection of air from different heights. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the appearance of the present utility model;

[0017] Figure 3 A structural schematic diagram of the straight cylinder, screw, and lifting component;

[0018] Figure 4 for Figure 1 A structural diagram of the crank handle, rotating rod, and straight cylinder;

[0019] Figure 5 for Figure 1 A structural diagram of the data acquisition box, straight cylinder, and screw;

[0020] Figure 6 for Figure 5 A structural diagram of the filter box, clamps, and filter plates;

[0021] Figure 7 for Figure 6 A schematic diagram of the structure of the filter cotton, filter plate and baffle.

[0022] In the diagram: 1. Collection box; 2. Impurity removal device; 21. Receiving cylinder; 22. Piston; 23. First electric valve; 24. First air outlet pipe; 25. Air inlet; 251. Second electric valve; 252. Two-way pipe; 253. Air pump; 26. Cleaning unit; 261. Third electric valve; 262. Second air outlet pipe; 3. Filtration mechanism; 31. Filter box; 32. Clamp; 33. Filter plate; 34. Filter cotton; 35. Stop block; 4. Adjustment part; 41. Base; 42. Straight cylinder; 43. Rotating rod; 44. First bevel gear; 45. Second bevel gear; 46. Screw; 47. Lifting component; 48. Crank handle; 49. Limiting unit; 491. Sleeve; 492. Spring; 493. Fixing component. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Existing air sampling devices collect outdoor air by placing the container directly outdoors and collecting the air through the collection device. However, because the container may contain residual air from previous exposures, the air from the two different areas mixes together, resulting in inaccurate test results.

[0025] In view of this, the present invention provides an air sampling device that can filter particulate matter. Through the cooperation between the receiving cylinder, the piston and the first electric valve, when collecting outside air, the sampling box is first placed outdoors, then the air inlet and the cleaning unit are closed, and the first electric valve is opened. The personnel manually push the piston to the other side of the receiving cylinder. During the pushing process, the air inside the receiving cylinder can be discharged through the first air outlet pipe. Then the first electric valve is closed, and the outside air is collected through the air inlet. This ensures that the inside of the receiving cylinder contains only the air collected at that time, thus ensuring the accuracy of the air test.

[0026] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0027] Example 1: By Figures 1 to 7 It is known that an air sampling device capable of filtering particulate matter includes a sampling box 1, a filter mechanism 3 is installed inside the sampling box 1, and a purification device 2 is installed inside the sampling box 1. The purification device 2 includes: two receiving cylinders 21, both fixedly connected to the inner wall of the sampling box 1; a piston 22, inserted into the inner wall of the receiving cylinder 21, with one end extending to the outside of the sampling box 1; the piston 22 is specifically structured as a push rod and a piston body, the push rod penetrating the inner wall of the sampling box 1, and a rubber gasket is provided at the connection point with the sampling box 1 to ensure sealing; and a first electric valve. Door 23 is installed on the outer wall of the receiving cylinder 21 at one end; first air outlet pipe 24 is connected to the other end of the first electric valve 23 and extends out of the outside of the collection box 1; air inlet 25 is provided on the outer side of the receiving cylinder 21; cleaning unit 26 is provided outside the air inlet 25; wherein, by pushing piston 22, impurity air inside the receiving cylinder 21 is discharged to the outside through the first electric valve 23 and the first air outlet pipe 24, air inlet 25 draws outside air into the receiving cylinder 21, and cleaning unit 26 cleans impurity air inside air inlet 25;

[0028] In the specific implementation process, it is worth noting that the model of the first electric valve 23 will not be specifically described here. Rubber pads are provided at the connection between the piston 22 and the receiving cylinder 21, and at the connection between the outer wall of the piston 22 and the inner wall of the collection box 1. This ensures that when the piston 22 is pushed to the other side of the receiving cylinder 21, no air will directly enter the receiving cylinder 21 without passing through the air inlet 25. When collecting outside air, the collection box 1 is first placed outdoors, then the air inlet 25 and the cleaning unit 26 are closed, and the first electric valve 23 is opened. Personnel manually push the piston 22 to the other side of the receiving cylinder 21. During the pushing process, the air inside the receiving cylinder 21 can be discharged through the first air outlet pipe 24. Then the first electric valve 23 is closed, and outside air is collected through the air inlet 25. When air enters the receiving cylinder 21, the pressure inside the receiving cylinder 21 increases, and the piston 22 will automatically move to the other side of the receiving cylinder 21. This ensures that the inside of the receiving cylinder 21 contains only the air collected at that time, thus ensuring the accuracy of the air test.

[0029] Furthermore, the air intake 25 includes: two second electric valves 251, one end of which is respectively installed on one side of the outer wall of the two receiving cylinders 21; a two-way pipe 252, both ends of which are respectively connected to the other ends of the two second electric valves 251; and an air pump 253, the output end of which is connected to one side of the two-way pipe 252 and fixedly connected to the inner wall of the collection box 1; wherein, when the second electric valves 251 are opened, the air pump 253 draws external air into the receiving cylinders 21 through the two-way pipe 252;

[0030] In the specific implementation process, it is worth noting that the model of the second electric valve 251 is not specifically limited here. When collecting air at different heights, it is necessary to close one of the two second electric valves 251 and open the other. Then, the air pump 253 is started, and the air pump 253 draws the outside air into the inside of the container 21 through the bidirectional pipe 252.

[0031] Furthermore, the cleaning unit 26 includes: a third electric valve 261, one end of which is installed on the outer wall of the bidirectional pipe 252 away from the air pump 253; and a second air outlet pipe 262, which is connected to the other end of the third electric valve 261 and extends to the outside of the collection box 1; wherein, when the first electric valve 23 and the second electric valve 251 are closed and the third electric valve 261 is opened, the impurities in the air inlet 25 are discharged to the outside through the air pump 253 and the second air outlet pipe 262.

[0032] In the specific implementation process, it is worth noting that the model of the third electric valve 261 will not be described in detail here. After the air at the lower level is collected, the first electric valve 23 and the second electric valve 251 are closed, the third electric valve 261 is opened, and the air pump 253 is started. This allows the air inside the bidirectional pipe 252 and the filter mechanism 3 to be discharged, preventing residual air from the lower level from flowing into the container cylinder 21 when collecting air at the higher level.

[0033] Furthermore, the filtration mechanism 3 includes: a filter box 31 connected to the input end of the air pump 253; a clamp 32 fixedly connected to the inner wall of the filter box 31; a filter plate 33 slidably clamped to the inner wall of the clamp 32; filter cotton 34 attached to the inner wall of the filter plate 33; and a stop block 35 rotatably connected to the inner wall of the filter plate 33 via a pin and attached to the surface of the filter cotton 34. The filter box 31 installs the clamp 32, and the clamp 32's engagement with the filter plate 33 facilitates the disassembly of the filter plate 33. The filter cotton 34 filters particulate matter in the air, and the stop block 35 restricts the filter cotton 34.

[0034] In the specific implementation process, it is worth noting that when the air pump 253 is working, it draws in outside air. The air first passes through the filter cotton 34, which blocks the particulate matter in the air. When the filter cotton 34 has been used for a long time, the filter plate 33 can be removed from the inner wall of the clip 32 by opening the cover on the front of the filter box 31 and rotating it through the pin shaft, so that the filter cotton 34 can be replaced. The baffle 35 can prevent the filter cotton 34 from moving when the air pump 253 draws in air. The pin shaft connecting the baffle 35 and the filter plate 33 is equipped with damping. Multiple baffles 35 can be provided to prevent the baffle 35 itself from moving without external force.

[0035] Specifically, when using this particulate-filterable air sampling device to collect ambient air, firstly, the sampling box 1 is placed outdoors. Then, the air inlet 25 and the cleaning unit 26 are closed, and the first electric valve 23 is opened. Personnel manually push the piston 22 to the other side of the receiving cylinder 21. During this pushing process, the air inside the receiving cylinder 21 is discharged through the first air outlet pipe 24. Afterward, the first electric valve 23 is closed, and ambient air is collected through the air inlet 25. When air enters the receiving cylinder 21, the pressure inside the cylinder increases, causing the piston 22 to automatically move to the other side of the receiving cylinder 21. This ensures that only the collected air remains inside the receiving cylinder 21, guaranteeing the accuracy of the air sample. When collecting air at different altitudes, one of the two second electric valves 251 needs to be activated. Close one valve, open the other, and then start the air pump 253. The air pump 253 draws outside air into the container 21 through the bidirectional pipe 252. After collecting the air from the lower level, close the first electric valve 23 and the second electric valve 251, open the third electric valve 261, and start the air pump 253. This allows the air inside the bidirectional pipe 252 and the filter mechanism 3 to be discharged, preventing residual air from the lower level from flowing into the container 21 when collecting air from the upper level. When the air pump 253 is working, it draws in outside air, which first passes through the filter cotton 34. The filter cotton 34 blocks particulate matter in the air. When the filter cotton 34 has been used for a long time, the filter plate 33 can be removed from the inner wall of the clip 32 and the filter cotton 34 can be replaced. The baffle 35 can prevent the filter cotton 34 from moving when the air pump 253 draws in air.

[0036] Example 2: From Figure 1-7It is known that an adjustment part 4 is provided on the back of the collection box 1. The adjustment part 4 includes: a base 41, located below the collection box 1; a straight cylinder 42, fixed to the inner wall of the base 41 by bolts; a rotating rod 43, rotatably connected to the inner wall of the straight cylinder 42 through a sealed bearing; a first bevel gear 44, fixedly connected to one end of the rotating rod 43 located inside the straight cylinder 42; a second bevel gear 45, meshing with the outer wall of the first bevel gear 44; a screw 46, one end fixedly connected to the inner wall of the second bevel gear 45, and the other end rotatably connected to the inner wall of the straight cylinder 42 through a sealed bearing; and a lifting component 47, threadedly connected to the outer wall of the screw 46, and... The movable connection is to the front opening of the straight cylinder 42 and is fixed to the back of the collection box 1 by bolts; the crank handle 48 is inserted into the inner wall of the rotating rod 43; the limiting unit 49 is set on the top of the base 41; wherein, the base 41 is used to install the straight cylinder 42, and the straight cylinder 42 is used to install and protect the rotating rod 43, the first bevel gear 44, the second bevel gear 45, the screw 46 and the lifting component 47. When the crank handle 48 is turned, the rotating rod 43 rotates, and the screw 46 rotates through the first bevel gear 44 and the second bevel gear 45, so that the lifting component 47 drives the collection box 1 to move up and down. The limiting unit 49 limits the rotating rod 43.

[0037] In the specific implementation process, it is worth noting that the rotating rod 43 has a square groove on one side outside the straight cylinder 42. One end of the crank handle 48 is inserted into the inner wall of the square groove. The straight cylinder 42, the base 41, the lifting component 47, and the collection box 1 are all fixed with bolts. If necessary, they can be disassembled for easy transportation. When it is necessary to collect and compare air at different heights, the crank handle 48 can be turned. The crank handle 48 drives the rotating rod 43 to rotate. The rotating rod 43 drives the first bevel gear 44, the first bevel gear 44 drives the second bevel gear 45, the second bevel gear 45 drives the screw 46, and the screw 46 drives the lifting component 47 to lift and lower. The lifting component 47 can then drive the collection box 1 to lift and lower. When collecting air at a lower level, one second electric valve 251 needs to be opened and one closed. After the air at the lower level is collected, the previously opened second electric valve 251 is closed and the other second electric valve 251 is opened to collect air at different heights.

[0038] Furthermore, the limiting unit 49 includes: a sleeve 491, fixedly connected to the top of the base 41; a spring 492, installed on the inner wall of the sleeve 491, and fixedly connected at the bottom to the top of the base 41; and a fixing member 493, fixedly connected at the bottom to the bottom of the spring 492, inserted at the top into the bottom groove of the rotating rod 43, and movably connected to the outer wall of the sleeve 491 with openings on both sides; wherein, the sleeve 491 installs the spring 492, the spring 492 provides force to the fixing member 493 to insert into the bottom groove of the rotating rod 43, and the fixing member 493 fixes the rotating rod 43;

[0039] In the specific implementation process, it is worth noting that when the height of the collection box 1 does not need to be adjusted, the fixing part 493 is inserted into the inner wall of the rotating rod 43 to prevent other personnel from accidentally touching the rotating rod 43 and causing it to rotate. When it is necessary to rotate the rotating rod 43, the personnel manually move the fixing part 493 downward to compress the spring 492, which will rotate the rotating rod 43. When rotating the rotating rod 43, because the outer wall of the fixing part 493 has a groove, the straight rod inserted into the inner wall of the sleeve 491 can be inserted into the groove, which prevents the fixing part 493 from being affected by the deformation of the spring 492 and thus affecting the rotation of the rotating rod 43.

[0040] Specifically, based on the above embodiment one, when it is necessary to collect and compare air at different heights, the crank handle 48 can be turned. The crank handle 48 drives the rotating rod 43 to rotate, the rotating rod 43 drives the first bevel gear 44, the first bevel gear 44 drives the second bevel gear 45, the second bevel gear 45 drives the screw 46, and the screw 46 drives the lifting component 47 to move up and down. The lifting component 47 can then drive the collection box 1 to move up and down. When collecting air at a lower altitude, one second electric valve 251 needs to be opened and one closed. After the air at the lower altitude is collected, the previously opened second electric valve 251 is closed and the other second electric valve 251 is opened. This allows for the collection of air at different heights. When the height of the collection box 1 does not need to be adjusted, the fixing component 493 is inserted into the inner wall of the rotating rod 43 to prevent other personnel from accidentally touching the rotating rod 43 and causing it to rotate.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., 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. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An air sampling device capable of filtering particulate matter, comprising a sampling box (1), characterized in that: The collection box (1) is equipped with a filter mechanism (3) inside, and the collection box (1) is equipped with a dirt removal device (2) inside, the dirt removal device (2) including: There are two receiving cylinders (21), both of which are fixedly connected to the inner wall of the collection box (1); The piston (22) is inserted into the inner wall of the receiving cylinder (21) and one end extends to the outside of the collection box (1); The first electric valve (23) is installed at one end on the outer wall of the receiving cylinder (21); The first vent pipe (24) is connected to the other end of the first electric valve (23) and extends out of the outside of the collection box (1); An air inlet (25) is provided on the outer side of the receiving cylinder (21); A cleaning unit (26) is disposed outside the air intake (25); In this process, by pushing the piston (22), the impurity air inside the container (21) is discharged through the first electric valve (23) and the first air outlet (24), the air inlet (25) draws the external air into the container (21), and the cleaning unit (26) cleans the impurity air inside the air inlet (25).

2. The air sampling device capable of filtering particulate matter according to claim 1, characterized in that: The air intake (25) includes: There are two second electric valves (251), one end of which is installed on one side of the outer wall of each of the two receiving cylinders (21); The two-way pipe (252) is connected at both ends to the other ends of the two second electric valves (251); An air pump (253) has its output end connected to one side of the bidirectional pipe (252) and is fixedly connected to the inner wall of the collection box (1); When the second electric valve (251) is opened, the air pump (253) draws outside air into the container (21) through the bidirectional pipe (252).

3. The air sampling device capable of filtering particulate matter according to claim 2, characterized in that: The cleaning unit (26) includes: The third electric valve (261) is installed at one end on the outer wall of the bidirectional pipe (252) away from the air pump (253); The second vent pipe (262) is connected to the other end of the third electric valve (261) and extends to the outside of the collection box (1); Specifically, the first electric valve (23) and the second electric valve (251) are closed, and the third electric valve (261) is opened. The impurities in the air inside the air inlet (25) are discharged through the air pump (253) and the second air outlet pipe (262).

4. The air sampling device capable of filtering particulate matter according to claim 3, characterized in that: The filtration mechanism (3) includes: The filter box (31) is connected to the input end of the air pump (253); The clip (32) is fixedly connected to the inner wall of the filter box (31); The filter plate (33) is slidably snapped onto the inner wall of the clip (32); Filter cotton (34) is attached to the inner wall of the filter plate (33); The baffle (35) is rotatably connected to the inner wall of the filter plate (33) by a pin and is attached to the surface of the filter cotton (34); The filter box (31) is equipped with a clip (32). The clip (32) is connected to the filter plate (33), which facilitates the disassembly of the filter plate (33). The filter cotton (34) filters particulate matter in the air, and the baffle (35) restricts the filter cotton (34).

5. An air sampling device capable of filtering particulate matter according to claim 1, characterized in that: The back of the collection box (1) is provided with an adjustment part (4), the adjustment part (4) includes: The base (41) is located below the collection box (1); A straight cylinder (42) is fixed to the inner wall of the base (41) by bolts; The rotating rod (43) is rotatably connected to the inner wall of the straight cylinder (42) via a sealed bearing; The first bevel gear (44) is fixedly connected to one end of the rotating rod (43) located inside the straight cylinder (42); The second bevel gear (45) is meshed with the outer wall of the first bevel gear (44); The screw (46) is fixedly connected at one end to the inner wall of the second bevel gear (45), and at the other end is rotatably connected to the inner wall of the straight cylinder (42) through a sealed bearing; The lifting component (47) is threaded to the outer wall of the screw (46) and movably connected to the front opening of the straight cylinder (42), and is fixedly connected to the back of the collection box (1) by bolts; A crank handle (48) is inserted into the inner wall of the rotating rod (43); A limiting unit (49) is disposed on the top of the base (41); The base (41) is used to install the straight cylinder (42). The straight cylinder (42) is used to install and protect the rotating rod (43), the first bevel gear (44), the second bevel gear (45), the screw (46), and the lifting component (47). The crank handle (48) is turned to make the rotating rod (43) rotate. The first bevel gear (44) and the second bevel gear (45) drive the screw (46) to rotate, so that the lifting component (47) drives the collection box (1) to move up and down. The limiting unit (49) limits the rotating rod (43).

6. An air sampling device capable of filtering particulate matter according to claim 5, characterized in that: The limiting unit (49) includes: Sleeve (491) is fixedly connected to the top of the base (41); Spring (492) is installed on the inner wall of sleeve (491) and its bottom is fixedly connected to the top of base (41); The fastener (493) is fixedly connected to the top of the spring (492) at the bottom, and inserted into the bottom groove of the rotating rod (43) at the top. Both sides of the outer wall are movably connected to the outer wall of the sleeve (491) with openings. The sleeve (491) is used to install the spring (492), the spring (492) provides force to the fixing member (493) to insert into the bottom groove of the rotating rod (43), and the fixing member (493) fixes the rotating rod (43).

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