An atmospheric pollution particulate sampling device

Abstract

The application discloses an atmospheric pollution particulate matter sampling device, which comprises a sampler, a supporting frame detachably connected to the bottom of the sampler, the bottom of the supporting frame being in contact with the ground, a connecting pipe threadedly connected to the top of the sampler, a sampling assembly detachably connected to the top of the connecting pipe, clamping assemblies symmetrically and detachably connected to the side walls of the sampling assembly, the clamping assemblies extending into a lifting assembly and being in sliding connection with the lifting assembly, and the bottom of the lifting assembly being fixedly connected with the sampler. The sampling device has high sampling precision for particulate matter, low sample loss rate, and more accurate measurement results, and can better reflect the content of local atmospheric pollution particulate matter.

Description

Technical Field

[0001] This invention belongs to the field of environmental sampling technology, and in particular relates to a sampling device for atmospheric particulate matter. Background Technology

[0002] Atmospheric particulate matter is a general term for all solid and liquid particulate matter present in the atmosphere. It is one of the important indicators for determining whether there is atmospheric pollution, so sampling devices are needed to sample particulate matter for detection.

[0003] When sampling with existing sampling devices, the sampling box is usually connected by threads, which makes it extremely inconvenient to replace the filter membrane. It requires two or more people to work together to complete the task as quickly as possible. Moreover, when replacing the filter membrane with the sample, it is easy to touch the threads and spill the sample, resulting in a large deviation in the measurement results.

[0004] Therefore, there is an urgent need for a sampling device for atmospheric particulate matter to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a sampling device for atmospheric particulate matter to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a sampling device for atmospheric particulate matter, including a sampler, a support frame detachably connected to the bottom of the sampler, the bottom of the support frame contacting the ground, a connecting pipe threadedly connected to the top of the sampler, a sampling component detachably connected to the top of the connecting pipe, clamping components symmetrically and detachably connected to the sidewalls of the sampling component, the clamping components extending into and slidably connected to the lifting component, and the bottom of the lifting component being fixedly connected to the sampler.

[0007] Preferably, the sampling assembly includes a tray threaded to the top of the connecting tube, a sampling box detachably connected to the top of the tray, a cutter head detachably connected to the top of the sampling box, and the clamping assembly symmetrically and detachably connected to the sidewalls of the cutter head and the sampling box.

[0008] Preferably, the clamping assembly includes a fixing ring detachably connected to the cutter head and the side wall of the sampling box, a connecting rod fixedly connected to the side wall of the fixing ring, one end of the connecting rod away from the fixing ring extending into the clamping box and slidably connected to the clamping box, and a slider fixedly connected to the side of the clamping box away from the connecting rod, the slider extending into the lifting assembly and slidably connected to the lifting assembly.

[0009] Preferably, an elastic airbag is installed inside the clamping box, the elastic airbag is fitted with a sliding plate, the side of the sliding plate away from the elastic airbag is fixed to the connecting rod, and return springs are symmetrically installed on both sides of the connecting rod, the return springs being located between the inner wall of the clamping box and the sliding plate.

[0010] Preferably, the lifting assembly includes a fixed cylinder fixedly connected to the sampler, the side wall of the fixed cylinder is provided with a through groove, the slider is slidably connected to the through groove, motors are symmetrically installed inside the fixed cylinder, the motors are fixedly connected to the top surface of the sampler, the output shaft of the motor is fixedly connected to a lead screw, the slider is threadedly connected to one of the lead screws and clearance-fitted to the other, and the top of the lead screw is rotatably connected to the top surface inside the fixed cylinder.

[0011] Preferably, a retaining ring is fixedly connected to the inner wall of the sampling box, a sealing ring is detachably connected to the top of the retaining ring, a placement frame is provided below the retaining ring, the placement frame is fixedly connected to the inner wall of the sampling box, a placement net is installed on the top of the placement frame, and racks are symmetrically fixedly connected to the bottom of the placement net. The two racks pass through the placement frame and mesh with a spur gear. The spur gear is fixedly connected to a connecting shaft, and both ends of the connecting shaft are rotatably connected to the inner wall of the sampling box. A second knob is fixedly connected to the center of the connecting shaft.

[0012] Preferably, the support frame includes a support plate detachably connected to the bottom of the sampler. A plurality of first legs are circumferentially hinged to the bottom surface of the support plate. A central shaft is fixed to the center of the bottom surface of the support plate. A ring is sleeved on the side wall of the central shaft. A plurality of limiting rods are circumferentially hinged to the side wall of the ring. One end of each limiting rod away from the ring is hinged to one of the first legs. A second leg is slidably connected to the bottom of each first leg. An adjustment component is installed inside each first leg. The adjustment component is detachably connected to the second leg. A conversion component is installed at the bottom of the second leg, and the conversion component is in contact with the ground.

[0013] Preferably, the adjustment assembly includes a first knob rotatably connected to the side wall of the first support leg. A horizontal shaft is fixedly connected to the center of the first knob. The horizontal shaft extends into the first support leg and is fixedly connected to a helical gear. The helical gear meshes with a gear plate. A plurality of sliding pillars are circumferentially fixed to the bottom edge of the gear plate. A limiting ring is slidably connected to the sliding pillars. The side wall of the limiting ring is fixedly connected to the inner wall of the first support leg. A groove is formed on the top surface of the limiting ring. The sliding pillars are located in the groove. A plurality of sliding grooves are formed circumferentially on the bottom surface of the gear plate. A sliding rod is slidably connected to the groove. A clamping block is fixedly connected to the bottom of the sliding rod. The clamping block is detachably connected to the second support leg. A fixing rod passes through the center of the clamping block. One end of the fixing rod is fixedly connected to the inner wall of the first support leg. The other end of the fixing rod is slidably connected to the clamping block and does not contact the second support leg.

[0014] Preferably, the conversion assembly includes a connecting frame fixedly connected to the bottom of the second leg, a rotating shaft rotatably connected to the bottom of the connecting frame, a foot fixedly connected to the side wall of the rotating shaft, a disc fixedly connected to the bottom of the foot, a plurality of teeth fixedly connected to the bottom surface of the disc, universal wheels symmetrically provided with the foot, shock-absorbing rods symmetrically rotatably connected to both ends of the universal wheels, the shock-absorbing rods being fixedly connected to the rotating shaft, shock-absorbing springs being sleeved on the side walls of the shock-absorbing rods, and a third knob fixedly connected to either end of the rotating shaft extending out of the connecting frame, a pin detachably connected to the third knob, the pin passing through the third knob and detachably connected to the connecting frame.

[0015] Preferably, a limiting plate is fixedly connected to the top surface of the support plate, the sampler is adapted to the limiting plate, a positioning post is fixedly connected to the center of the top surface of the support plate, and a positioning groove adapted to the positioning post is provided at the bottom of the sampler.

[0016] This invention discloses the following technical advantages: A support frame supports the sampler, ensuring stability during sampling. The top of the sampler is connected to the sampling component via a connecting pipe. The sampling component uses an embedded connection, making disassembly easier and preventing sample spillage from the filter membrane, thus improving the accuracy of the results. A clamping component holds the sampling component, and a lifting component moves the clamping component up and down, thereby moving the sampling component up and down. This facilitates filter membrane replacement for the sampler, saving time and improving sampling efficiency. This invention offers high sampling accuracy for particulate matter, low sample loss rate, and more accurate measurement results, better reflecting the local concentration of particulate matter in atmospheric pollution. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 For the present invention Figure 1 A magnified view of part A in the image;

[0020] Figure 3 For the present invention Figure 1 A magnified view of part B in the image;

[0021] Figure 4 This is a schematic diagram of the sampling box of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the clamping box of the present invention;

[0023] Figure 6 This is a cross-sectional view of the first leg of the present invention;

[0024] Figure 7 This is a bottom view of the toothed disc of the present invention;

[0025] Figure 8 This is a top view of the support plate of the present invention;

[0026] In the diagram: 1. Sampler; 2. Support plate; 3. First leg; 4. First knob; 5. Second leg; 6. Cutter head; 7. Sampling box; 8. Tray; 9. Connecting pipe; 10. Fixing cylinder; 11. Lead screw; 12. Slider; 13. Motor; 14. Pressure box; 15. Connecting rod; 16. Fixing ring; 17. Helical gear; 18. Gear plate; 19. Limiting ring; 20. Fixing rod; 21. Slide rod; 22. Clamping block; 23. Slide groove; 24. Retaining ring; 25. Placement rack; 26. Placement net; 27. Rack; 28. Connecting shaft; 29. ​​Second knob; 30. Spur gear; 31. Sealing ring; 32. Elastic airbag; 33. Slide plate; 34. Return spring; 35. Connecting frame; 36. Rotating shaft; 37. Support leg; 38. Disc; 39. Tooth; 40. Third knob; 41. Pin; 42. Caster wheel; 43. Shock-absorbing spring; 44. Limiting plate; 45. Positioning post; 46. Limiting rod; 47. Ring. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Reference Figure 1-8 As shown, this embodiment provides a sampling device for atmospheric particulate matter, including a sampler 1. A support frame is detachably connected to the bottom of the sampler 1, and the bottom of the support frame is in contact with the ground. A connecting pipe 9 is threadedly connected to the top of the sampler 1, and a sampling component is detachably connected to the top of the connecting pipe 9. Clamping components are symmetrically and detachably connected to the side wall of the sampling component. The clamping components extend into the lifting component and are slidably connected to the lifting component. The bottom of the lifting component is fixedly connected to the sampler 1.

[0030] The sampler 1 is equipped with a control panel (not shown in the figure). A support frame supports the sampler 1 to ensure stability during sampling. The top of the sampler 1 is connected to the sampling component via a connecting pipe 9. The sampling component uses an embedded connection, making disassembly easier and preventing sample spillage from the filter membrane, thus improving the accuracy of the results. A clamping component holds the sampling component, and the control panel operates a lifting component that moves the clamping component up and down, thereby moving the sampling component up and down. This facilitates filter membrane replacement for the sampler, saving time and improving sampling efficiency. This invention offers high sampling accuracy for particulate matter, low sample loss rate, and more accurate measurement results, better reflecting the local concentration of particulate matter in atmospheric pollution.

[0031] The sampling component is further optimized by including a tray 8 that is threaded to the top of the connecting tube 9, a sampling box 7 that is detachably connected to the top of the tray 8, a cutter head 6 that is detachably connected to the top of the sampling box 7, and clamping components that are symmetrically and detachably connected to the side walls of the cutter head 6 and the sampling box 7.

[0032] A further optimized design includes a clamping assembly comprising a fixing ring 16 detachably connected to the side walls of the cutter head 6 and the sampling box 7, respectively. A connecting rod 15 is fixedly connected to the side wall of the fixing ring 16. One end of the connecting rod 15, away from the fixing ring 16, extends into the clamping box 14 and is slidably connected to the clamping box 14. A slider 12 is fixedly connected to the side of the clamping box 14 away from the connecting rod 15. The slider 12 extends into the lifting assembly and is slidably connected to the lifting assembly. The clamping box 14 moves the connecting rod 15, which in turn moves the fixing ring 16 toward the cutter head 6 and the sampling box 7, thereby clamping the cutter head 6 and the sampling box 7.

[0033] The design is further optimized by installing an elastic airbag 32 inside the clamping box 14. The elastic airbag 32 is fitted with a sliding plate 33. The side of the sliding plate 33 away from the elastic airbag 32 is fixed to the connecting rod 15. Return springs 34 are symmetrically installed on both sides of the connecting rod 15, located between the inner wall of the clamping box 14 and the sliding plate 33. By inflating the elastic airbag 32 inside the clamping box 14, the sliding plate 33 is moved, which in turn moves the connecting rod 15, clamping the cutter head 6 and the sampling box 7. The advantage of using the elastic airbag 32 is that the clamping force is long-lasting and does not consume electricity, providing good clamping performance. After sampling is completed, the air in the elastic airbag 32 is released. At this time, under the action of the return spring 34, the sliding plate 33 causes the connecting rod 15 to retract, freeing the cutter head 6 and the sampling box 7, allowing them to be placed into the storage box.

[0034] The design is further optimized by including a fixed cylinder 10 fixedly connected to the sampler 1. A through groove is formed on the side wall of the fixed cylinder 10, and a slider 12 is slidably connected to the through groove. Motors 13 are symmetrically installed inside the fixed cylinder 10, and each motor 13 is fixedly connected to the top surface of the sampler 1. A lead screw 11 is fixedly connected to the output shaft of the motor 13. The slider 12 is threadedly connected to one of the lead screws 11 and clearance-fitted to the other. The top of the lead screw 11 is rotatably connected to the top surface inside the fixed cylinder 10. Either motor 13 drives the lead screw 11 to rotate, thereby causing the slider 12 connected to the cutter head 6 to move upwards. Then, another motor 13 drives the slider 12 connected to the sampling box 7 to move upwards, maintaining a certain distance between them. This facilitates the removal and replacement of the filter membrane in the sampling box 7 with a new, weighed filter membrane. After replacement, the entire assembly is lowered for sampling, which is convenient, quick, and can be completed by one person.

[0035] The design is further optimized by fixing a retaining ring 24 to the inner wall of the sampling box 7. A sealing ring 31 is detachably connected to the top of the retaining ring 24. A placement frame 25 is located below the retaining ring 24 and is fixed to the inner wall of the sampling box 7. A placement net 26 is installed on the top of the placement frame 25, and racks 27 are symmetrically fixed to the bottom of the placement net 26. The two racks 27 pass through the placement frame 25 and mesh with spur gears 30. A connecting shaft 28 is fixed to the spur gears 30, and both ends of the connecting shaft 28 are rotatably connected to the inner wall of the sampling box 7. A second knob 29 is fixed to the center of the connecting shaft 28. By rotating the second knob 29, the two spur gears 30 are rotated, which in turn causes the meshing racks 27 to move upward, thereby moving the placement net 26 upward until it passes the retaining ring 24. At this point, the sampled filter membrane can be removed and stored with tweezers for weighing and measurement. This design is more convenient than the threaded connection of the sampling box 7, reduces sample loss, and improves accuracy.

[0036] Further optimization of the design includes a support frame comprising a support plate 2 detachably connected to the bottom of the sampler 1. Several first legs 3 are circumferentially hinged to the bottom surface of the support plate 2. A central shaft is fixed to the center of the bottom surface of the support plate 2. A ring 47 is fitted onto the side wall of the central shaft. Several limiting rods 46 are circumferentially hinged to the side wall of the ring 47. The ends of the limiting rods 46 away from the ring 47 are hinged to the first legs 3. Second legs 5 are slidably connected to the bottom of the first legs 3. An adjustment component is installed inside the first legs 3, and the adjustment component is detachably connected to the second legs 5. A conversion component is installed at the bottom of the second legs 5, and the conversion component contacts the ground. Three first legs 3 are provided, and three limiting rods 46 are also provided hinged to them. The ring 47 and the limiting rods 46 can limit the movement of the first legs 3, facilitating storage and support.

[0037] Further optimization of the scheme: The adjustment component includes a first knob 4 rotatably connected to the side wall of the first leg 3. A horizontal shaft is fixedly connected to the center of the first knob 4. The horizontal shaft extends into the first leg 3 and is fixedly connected to a helical gear 17. The helical gear 17 meshes with a gear disk 18. Several sliding pillars are circumferentially fixed to the bottom edge of the gear disk 18. The sliding pillars are slidably connected to a limiting ring 19. The side wall of the limiting ring 19 is fixedly connected to the inner wall of the first leg 3. A ring groove is opened on the top surface of the limiting ring 19. The sliding pillars are located in the ring groove. Several sliding grooves 23 are circumferentially opened on the bottom surface of the gear disk 18. A sliding rod 21 is slidably connected in the sliding groove 23. A clamping block 22 is fixedly connected to the bottom of the sliding rod 21. The clamping block 22 is detachably connected to the second leg 5. A fixing rod 20 passes through the center of the clamping block 22. One end of the fixing rod 20 is fixedly connected to the inner wall of the first leg 3. The other end of the fixing rod 20 is slidably connected to the clamping block 22 and does not contact the second leg 5. The existing first leg 3 uses an opening and closing compression method to control the extension and retraction of the second leg 5. After long-term use, it is very easy to be damaged, which reduces the service life of the support frame and affects normal sampling work.

[0038] Rotating the first knob 4 drives the helical gear 17 to rotate, which in turn drives the gear plate 18 to rotate. The limiting ring 19 limits the gear plate 18 and is rotatably connected to it. When the gear plate 18 rotates, it drives the slide groove 23 to rotate. When the slide groove 23 rotates, it causes the slide rod 21 to move horizontally, thereby adjusting the movement of the clamping block 22 so that it clamps or releases with the second support leg 5. The fixing rod 20 horizontally limits the clamping block 22, so that the clamping block 22 and the slide rod 21 can only move horizontally. The operation is convenient and quick, and it is not easy to be damaged and has a long service life.

[0039] The scheme is further optimized. The conversion component includes a connecting frame 35 fixedly connected to the bottom of the second support leg 5. A rotating shaft 36 is rotatably connected to the bottom of the connecting frame 35. A support leg 37 is fixedly connected to the side wall of the rotating shaft 36. A disc 38 is fixedly connected to the bottom of the support leg 37. Several teeth 39 are fixedly connected to the bottom surface of the disc 38. A universal wheel 42 is symmetrically provided with the support leg 37. Shock-absorbing rods are symmetrically rotatably connected to both ends of the universal wheel 42. The shock-absorbing rods are fixedly connected to the rotating shaft 36. A shock-absorbing spring 43 is sleeved on the side wall of the shock-absorbing rod. One end of the rotating shaft 36 extends out of the connecting frame 35 and is fixedly connected to a third knob 40. A pin 41 is detachably connected to the third knob 40. The pin 41 passes through the third knob 40 and is detachably connected to the connecting frame 35. When sampling in rugged areas or mining areas where the ground is uneven, the support can be provided by the disc 38 at the bottom of the support leg 37. At the same time, the teeth 39 on the bottom surface of the disc 38 contact the ground to increase grip and ensure a stable sampling process. When sampling around the factory area or on a flat road, when changing sampling points, remove the pin 41, turn the third knob 40 to rotate the shaft 36 until the caster wheel 42 contacts the ground, and then insert the pin 41 to fix it. At this time, the support frame can be moved, saving the trouble of carrying it manually or packing it in a box, saving manpower and storage steps, and saving time.

[0040] The design is further optimized by fixing a limiting plate 44 to the top surface of the support plate 2, with the sampler 1 adapted to the limiting plate 44. A positioning post 45 is fixed to the center of the top surface of the support plate 2, and the bottom of the sampler 1 has a positioning groove adapted to the positioning post 45. The limiting plate 44 limits the position of the sampler 1, preventing its center of gravity from shifting. At the same time, the positioning post 45 facilitates quick installation and further enhances the stability of the connection.

[0041] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0042] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A sampling device for atmospheric particulate matter, characterized in that: The sampler includes a sampler (1), a support frame detachably connected to the bottom of the sampler (1), the bottom of the support frame being in contact with the ground, a connecting pipe (9) threadedly connected to the top of the sampler (1), a sampling assembly detachably connected to the top of the connecting pipe (9), clamping assemblies symmetrically and detachably connected to the sidewalls of the sampling assembly, the clamping assemblies extending into and slidingly connected to the lifting assembly, the bottom of the lifting assembly being fixedly connected to the sampler (1), the sampling assembly including a tray (8) threadedly connected to the top of the connecting pipe (9), a sampling box (7) detachably connected to the top of the tray (8), and a cutter head (6) detachably connected to the top of the sampling box (7), the cutter head (6) being... The clamping assembly is symmetrically and detachably connected to the side walls of the cutter head (6) and the sampling box (7). The clamping assembly includes a fixing ring (16) detachably connected to the side walls of the cutter head (6) and the sampling box (7). A connecting rod (15) is fixedly connected to the side wall of the fixing ring (16). One end of the connecting rod (15) away from the fixing ring (16) extends into the pressure box (14) and is slidably connected to the pressure box (14). A slider (12) is fixedly connected to the side of the pressure box (14) away from the connecting rod (15). The slider (12) extends into the lifting assembly and is slidably connected to the lifting assembly. A retaining ring (24) is fixedly connected to the inner wall of the sampling box (7). A sealing ring (31) is detachably connected to the top of the retaining ring (24). A placement rack (25) is provided below the retaining ring (24). The placement rack (25) is fixedly connected to the inner wall of the sampling box (7). A placement net (26) is installed on the top of the placement rack (25). A rack (27) is symmetrically fixed to the bottom of the placement net (26). The two racks (27) pass through the placement rack (25) and mesh with a spur gear (30). A connecting shaft (28) is fixedly connected to the spur gear (30). The two ends of the connecting shaft (28) are rotatably connected to the inner wall of the sampling box (7). A second knob (29) is fixedly connected to the center of the connecting shaft (28). The support frame includes the bottom of the sampler (1). A detachable support plate (2) has several first legs (3) circumferentially hinged to its bottom surface. A central shaft is fixed to the center of the bottom surface of the support plate (2). A ring (47) is sleeved on the side wall of the central shaft. Several limiting rods (46) are circumferentially hinged to the side wall of the ring (47). One end of the limiting rods (46) away from the ring (47) is hinged to the several first legs (3). A second leg (5) is slidably connected to the bottom of the first leg (3). An adjustment component is installed inside the first leg (3). The adjustment component is detachably connected to the second leg (5). A conversion component is installed at the bottom of the second leg (5). The conversion component is in contact with the ground.

2. The sampling device for atmospheric particulate matter according to claim 1, characterized in that: An elastic airbag (32) is installed inside the compression box (14). The elastic airbag (32) is attached to a sliding plate (33). The side of the sliding plate (33) away from the elastic airbag (32) is fixed to the connecting rod (15). Reset springs (34) are symmetrically installed on both sides of the connecting rod (15). The reset springs (34) are located between the inner wall of the compression box (14) and the sliding plate (33).

3. The sampling device for atmospheric particulate matter according to claim 1, characterized in that: The lifting assembly includes a fixed cylinder (10) fixedly connected to the sampler (1). The side wall of the fixed cylinder (10) is provided with a through groove. The slider (12) is slidably connected to the through groove. Motors (13) are symmetrically installed inside the fixed cylinder (10). The motors (13) are fixedly connected to the top surface of the sampler (1). The output shaft of the motor (13) is fixedly connected to a lead screw (11). The slider (12) is threadedly connected to one of the lead screws (11) and clearance-fitted to the other. The top of the lead screw (11) is rotatably connected to the top surface inside the fixed cylinder (10).

4. The sampling device for atmospheric particulate matter according to claim 1, characterized in that: The adjustment assembly includes a first knob (4) rotatably connected to the side wall of the first support leg (3). A horizontal shaft is fixedly connected to the center of the first knob (4). The horizontal shaft extends into the first support leg (3) and is fixedly connected to a helical gear (17). The helical gear (17) meshes with a gear disc (18). Several sliding pillars are circumferentially fixed to the bottom edge of the gear disc (18). The sliding pillars are slidably connected to a limiting ring (19). The side wall of the limiting ring (19) is fixedly connected to the inner wall of the first support leg (3). A ring groove is opened on the top surface of the limiting ring (19). The sliding pillars are located at... Within the annular groove, the bottom surface of the toothed disc (18) is provided with several sliding grooves (23). A sliding rod (21) is slidably connected within the sliding groove (23). A clamping block (22) is fixedly connected to the bottom of the sliding rod (21). The clamping block (22) is detachably connected to the second support leg (5). A fixing rod (20) passes through the center of the clamping block (22). One end of the fixing rod (20) is fixedly connected to the inner wall of the first support leg (3), and the other end of the fixing rod (20) is slidably connected to the clamping block (22) and does not contact the second support leg (5).

5. The sampling device for atmospheric particulate matter according to claim 1, characterized in that: The conversion assembly includes a connecting frame (35) fixedly connected to the bottom of the second leg (5). The bottom of the connecting frame (35) is rotatably connected to a rotating shaft (36). The side wall of the rotating shaft (36) is fixedly connected to a foot (37). The bottom of the foot (37) is fixedly connected to a disc (38). The bottom surface of the disc (38) is circumferentially fixed with several teeth (39). A universal wheel (42) is symmetrically provided with the foot (37). The two ends of the universal wheel (42) are symmetrically rotatably connected to shock-absorbing rods. The shock-absorbing rods are fixedly connected to the rotating shaft (36). The side wall of the shock-absorbing rod is fitted with a shock-absorbing spring (43). One end of the rotating shaft (36) extends out of the connecting frame (35) and is fixedly connected to a third knob (40). A pin (41) is detachably connected to the third knob (40). The pin (41) passes through the third knob (40) and is detachably connected to the connecting frame (35).

6. The sampling device for atmospheric particulate matter according to claim 1, characterized in that: The top surface of the support plate (2) is fixedly connected to a limiting plate (44), the sampler (1) is adapted to the limiting plate (44), the center of the top surface of the support plate (2) is fixedly connected to a positioning post (45), and the bottom of the sampler (1) is provided with a positioning groove adapted to the positioning post (45).

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