Atmospheric particulate matter detecting and sampling device

Abstract

The utility model relates to the field of atmospheric particulates, in particular to an atmospheric particulate detecting and sampling device which comprises a support and a collecting device, the collecting device comprises a shell, the top and the bottom of the shell are detachably and hermetically connected with an air inlet channel and an air outlet channel respectively, and a mounting ring for erecting a net plate is horizontally arranged on the inner wall of the shell. The upper surface of the screen plate is provided with a cross-shaped cutter groove which equally divides the surface of the screen plate into four parts, the bottom of the screen plate is fixedly connected with a push-pull rod, a circular ring is arranged above the screen plate, the left side and the right side of the circular ring are symmetrically provided with guide rods, and the guide rods are connected into guide grooves in the shell in a sliding mode and can be pulled out of the guide grooves from bottom to top; a plurality of arc-shaped pressing plates capable of fixing the filter membrane on the screen plate are arranged at intervals in the circumferential direction of the inner side of the circular ring and are arranged in a staggered cross-shaped cutter groove mode, the filter membrane is convenient to detach, vibration of the filter membrane in the detaching, moving and cutting process is relieved, the filter membrane is convenient to cut, and meanwhile the size of the cut filter membrane can be accurately controlled.

Description

Technical Field

[0001] The utility model relates to the field of atmospheric particulate matter, in particular to an atmospheric particulate matter detection and sampling device. Background Art

[0002] With the continuous development of industry, the living environment of human beings is constantly being destroyed. The air pollution situation is severe, and the occurrence of smog weather is becoming more and more common. Since the air contains a variety of atmospheric particulate matter, various particulate substances are evenly dispersed in the air to form a relatively stable and huge suspension system, namely the aerosol system. Some fine particles of various sizes such as PM10, PM2.5, TSP, etc. can enter the human body through the human respiratory system, which is extremely harmful to the human body. Therefore, atmospheric particulate matter detection equipment is usually used to detect air quality. In the existing technology, it is generally necessary to use a filter membrane to sample the particulate matter. When sampling the filter membrane, the following problems generally occur: Question: First, after sampling is completed, it is not convenient to disassemble the filter membrane, and it is easy to generate vibration during the disassembly and movement process, causing the atmospheric particulate matter enriched on the filter membrane to fall off, thus affecting the subsequent detection results; second, when detecting heavy metal components in atmospheric particulate matter, the filter membrane needs to be digested together with the atmospheric particulate matter enriched on it, and often only one-half or one-quarter of the filter membrane is needed. Therefore, during the process of cutting and intercepting the filter membrane, the filter membrane will often vibrate. In addition, it is difficult to accurately control the cutting size, and the cut filter membrane is often difficult to make it exactly one-quarter of the filter membrane, which will have a great impact on the detection efficiency and measurement results. Summary of the invention

[0003] In view of the above problems, the purpose of the utility model is to provide an atmospheric particulate matter detection sampling device which is easy to disassemble the filter membrane, reduces the vibration of the filter membrane during the disassembly, movement and cutting process, facilitates the cutting of the filter membrane, and can accurately control the size of the cut filter membrane.

[0004] The purpose of the utility model is achieved through the following technical solutions: An atmospheric particulate matter detection sampling device, comprising a support, and a collecting device installed on the support, the collecting device comprising a shell for installing a collecting mechanism, the top and bottom of the shell are respectively connected to an air intake channel and an exhaust channel through a detachable sealing connection structure, a mounting ring is horizontally arranged on the inner wall of the shell, a mesh plate is mounted on the mounting ring, the diameter of the mesh plate matches the inner diameter of the shell, a cross-shaped knife groove is arranged on the upper surface of the mesh plate to divide the plate surface into four parts, a push-pull rod is fixed to the bottom of the mesh plate, a circular ring is arranged above the mesh plate, guide rods are symmetrically arranged on the left and right sides of the circular ring, guide grooves are arranged on the left and right sides of the shell, the guide rods are slidably connected in the guide grooves and the guide rods can be pulled out of the guide grooves from bottom to top, a plurality of arc-shaped pressure plates that can fix the filter membrane on the mesh plate are arranged in the circumferential gap inside the circular ring, and the arc-shaped pressure plates are staggered with the cross-shaped knife grooves, and an air intake fan and a dehumidifier hook are arranged on the air intake channel.

[0005] Furthermore, a mark is provided on the inner side of the shell corresponding to the end position of the cross-shaped knife groove, and a scale is provided on each of the cross-shaped knife grooves. When cutting and sampling are required, when placing the filter membrane, the scale can be used to observe that the center of the filter membrane coincides with the center of the cross-shaped knife groove, which is convenient for cutting.

[0006] Furthermore, the distance between the outer circle of the mesh plate and the inner diameter of the shell is not greater than 1 mm, so as to prevent the mesh plate from tilting or sliding left and right when the mesh plate is pushed and pulled upward.

[0007] Furthermore, sliding blocks are provided on the left and right sides of the mesh plate corresponding to the positions of the guide grooves, and the mesh plate is slidably connected to the guide grooves via the sliding blocks to prevent the mesh plate from rotating during the pushing and pulling process.

[0008] Furthermore, the air intake channel and the exhaust channel are connected to the shell on which the collection mechanism is installed through a snap-on structure, and strip grooves or strip plugs are vertically arranged at the upper and lower ends of the outer wall of the shell, and the lower end of the air intake channel and the upper end of the exhaust channel are respectively provided with strip plugs or strip grooves that match the strip grooves or strip plugs on the outer wall of the shell. After the atmospheric particulate matter is collected, the shell and the air intake channel and the exhaust channel can be directly disassembled by pulling, which is convenient and quick.

[0009] Furthermore, a transverse rod is horizontally installed on the shell below the mounting ring, and a limit ring is arranged on the transverse rod corresponding to the position of the push-pull rod, the lower end of the push-pull rod is slidably connected to the limit ring, and an elastic buffer pad is arranged on the inner side of the limit ring. During detection, the lower end of the push-pull rod is inserted into the limit ring and fixed, so as to increase the stability of the mesh plate on the mounting ring. After the atmospheric particulate matter is collected, the shell is disassembled from the intake channel and the exhaust channel, and then the push-pull rod is held to push the mesh plate upward, thereby pushing the filter membrane on the mesh plate together with the arc pressure plate pressed on the filter membrane upward, so that the guide rods on both sides of the circular ring slide upward in the guide groove until the mesh plate is pushed to the upper end of the shell at a height convenient for removing the filter membrane. During the upward movement of the mesh plate, the arc pressure plate presses the filter membrane against the mesh plate to prevent movement or vibration, and then the guide rod is held to pull the circular ring together with the arc pressure plate out from the top of the shell, and the mesh plate together with the filter membrane and the circular ring can also be taken out together as needed. During the removal process, the arc pressure plate is always pressed against the filter membrane until it is moved to a suitable operating position.

[0010] Furthermore, the push-pull rod is provided with a handle which is convenient for fingers to grasp.

[0011] Furthermore, a transverse rod is horizontally installed on the shell below the mounting ring, and the push-pull rod is an electric push-pull rod, the bottom of the electric push-pull rod is fixed to the transverse rod, and the movable end of the electric push-pull rod is connected to the bottom of the mesh plate.

[0012] Furthermore, the mesh plate is provided with a groove for accommodating the filter membrane and an annular groove matching the circular ring shape.

[0013] Furthermore, the contact surfaces of the arc-shaped pressure plate and the mesh plate are provided with mutually matching convex ring and groove clamping structures to ensure a stable connection between the two and prevent displacement.

[0014] Furthermore, a handle is provided at the top of the guide rod, and a depression in which the handle can be embedded is provided at the lower end of the air inlet channel. When the mesh plate together with the filter membrane and the arc-shaped pressure plate are pushed upward until they are taken out of the shell, the handle at the top of the guide rod can be pressed by hand to mortgage the arc-shaped pressure plate on the filter membrane so that the filter membrane is always clamped between the mesh plate and the arc-shaped pressure plate during the movement, further preventing it from vibrating.

[0015] Furthermore, two guide rods are provided at both ends of at least one of the cross-shaped knife grooves on the circular ring, and guide tubes are slidably fitted on the two guide rods respectively, a horizontal rod is connected between the two guide tubes, and a cross-shaped cutter head matching the cross-shaped cutter groove is connected in the middle of the horizontal rod through a vertical rod. When one-fourth of the filter membrane needs to be taken for digestion, the guide tube can be fitted onto the two guide rods, and the cross-shaped cutter head can be pressed downward by pressing the horizontal rod to shear the filter membrane. During shearing, the cutting edge of the cross-shaped cutter head is inserted downward into the cross-shaped cutter groove to shear the filter membrane. Since the filter membrane is always clamped between the arc pressure plate and the mesh plate during the shearing process, vibration during the shearing process can be avoided.

[0016] Furthermore, the cross-shaped cutter head is made of ceramic material to avoid metal pollution.

[0017] Furthermore, the exhaust channel includes a cylinder that is snap-connected to the lower end of the shell, a protective mesh cover is provided at the lower end of the cylinder, a hole is provided on the support for accommodating the shell to pass through, the shell is mounted on the support through the ear plate of the side wall, a hook is hingedly connected to the outer wall of the cylinder, and a snap ring that cooperates with the hook is provided on the support. During inspection, the cylinder is snap-connected to the lower end of the shell, and then the hook is hung on the snap ring to prevent the cylinder of the exhaust channel from falling downward.

[0018] When using the utility model for detection, first install the shell on the support, place the mesh plate on the mounting ring, then place the filter membrane on the mesh plate, and insert the guide rod from the top of the guide groove downward into the guide groove, hold the guide rod and press it down to make it slide downward along the guide groove, drive the circular ring at the lower end of the guide rod to move downward until the arc pressure plate circumferentially arranged on the inner side of the circular ring presses the filter membrane against the mesh plate. When cutting is required, the distance from the edge of the filter membrane to the end of the knife groove is observed when the filter membrane is placed, so that the filter membrane and the center of the cross knife groove coincide with each other, and a paper cutter can be used to cut directly along the cross knife groove. Since the filter membrane is pressed between the arc pressure plate and the mesh plate at this time, the vibration of the filter membrane during cutting can be reduced. At the same time, since the cross knife groove divides the mesh plate surface into four parts, the filter membrane can be cut into two or four equal parts by cutting along the cross knife groove. When the atmospheric particulate matter on the filter membrane is enriched, The air inlet channel and the exhaust channel can be removed from the shell, and the screen plate can be pushed upward by the push-pull rod fixed to the bottom of the screen plate. The screen plate, together with the filter membrane and the arc-shaped pressure plate, moves upward to a position convenient for removing the filter membrane. Since the guide rod always slides upward in the guide groove during the process of pushing the screen plate upward, the filter membrane is clamped between the screen plate and the arc-shaped pressure plate, and the movement is smooth, the vibration is small, and the filter membrane always remains horizontal during the upward movement. When removing the filter membrane, the arc-shaped pressure plate can be directly pulled up by the guide rod to disengage it from the filter membrane. At this time, the arc-shaped pressure plate can be pulled out of the shell as needed, or the screen plate can be pushed upward until it is taken out of the shell together with the filter membrane and the arc-shaped pressure plate, and then moved to a position convenient for digestion. At this time, it is necessary to press the top of the guide rod by hand to mortgage the arc-shaped pressure plate on the filter membrane so that the filter membrane is always clamped between the screen plate and the arc-shaped pressure plate during the movement to prevent it from vibrating.

[0019] Beneficial effects: The utility model facilitates the disassembly of the filter membrane, reduces the vibration of the filter membrane during the disassembly, movement and cutting process, facilitates the cutting of the filter membrane, and can accurately control the size of the cut filter membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is described in more detail below by way of example with reference to the accompanying drawings, in which:

[0021] Figure 1 : Schematic diagram of the shell installation structure in Example 1 of the present utility model.

[0022] Figure 2 : A schematic diagram of the structure of the collecting device in Example 1 of the present utility model.

[0023] Figure 3 : Schematic diagram of the top view of the mesh plate and the circular ring installation structure in Example 1 of the utility model.

[0024] Figure 4 : Schematic diagram of the structure in which the cross cutter head in Example 2 of the utility model is slidably connected to the guide rod through a guide tube.

[0025] Figure 5 : Schematic diagram of the cross cutter head installation structure in Example 2 of the present utility model.

[0026] Figure 6 : Schematic diagram of the mesh panel installation structure in Example 3 of the present utility model.

[0027] In the figure: 01. support, 1. collecting device, 2. shell, 3. air inlet channel, 4. exhaust channel, 5. filter membrane, 20. ear plate, 21. mounting ring, 22. mesh plate, 23. cross-shaped knife groove, 24. push-pull rod, 25. circular ring, 26. strip plug, 27. strip groove, 28. transverse rod, 29. limit ring, 221. groove, 222. annular groove, 223. convex ring and groove clamping structure, 224. slider, 241. handle, 251. guide rod, 252. guide groove, 253. arc pressure plate, 254. guide rod II, 255. guide tube, 256. horizontal rod, 257. cross-shaped knife head, 31. suction fan, 32. dehumidification mechanism, 33. handle, 34. cylinder, 35. protective mesh cover, 341. hook, 342. clamping ring. Implementation

[0028] In the present utility model, for the convenience of description, the relative position relationship of each component is described according to the layout of the drawings in the specification, such as: the position relationship of up, down, left, right, etc. is determined according to the layout direction in the drawings in the specification.

[0029] Example 1, reference Figure 1 , Figure 2 , Figure 3 A device for detecting and sampling atmospheric particulate matter comprises a support 01 and a collecting device 1 mounted on the support 01, wherein the collecting device 1 comprises a shell 2 for mounting a collecting mechanism, the top and bottom of the shell 2 are respectively connected to an air inlet channel 3 and an air exhaust channel 4 through a detachable sealing connection structure, a mounting ring 21 is horizontally arranged on the inner wall of the shell 2, a mesh plate 22 is arranged on the mounting ring 21, the diameter of the mesh plate 22 matches the inner diameter of the shell 2, a cross-shaped knife groove 23 is arranged on the upper surface of the mesh plate 22 for evenly dividing the plate surface into four parts, and a push-pull rod 24 is fixedly connected to the bottom of the mesh plate 22 A circular ring 25 is arranged above the mesh plate 22, and guide rods 251 are symmetrically arranged on the left and right sides of the circular ring 25. Guide grooves 252 are arranged on the left and right sides of the shell 2. The guide rods 251 are slidably connected in the guide grooves 252 and the guide rods 251 can be pulled out from the guide grooves 252 from bottom to top. Four arc-shaped pressure plates 253 that can fix the filter membrane 5 on the mesh plate 22 are arranged in the circumferential gap inside the circular ring 25, and the arc-shaped pressure plates 253 are staggered from the cross-shaped knife grooves 23. An air intake fan 31 and a dehumidifier hook 32 are arranged on the air inlet channel 3.

[0030] The inner side of the shell 2 is provided with a mark corresponding to the end position of the cross-shaped knife groove 23, and each knife groove of the cross-shaped knife groove 23 is provided with a scale. When cutting and sampling are required, when the filter membrane 5 is placed, the center of the filter membrane 5 can be observed through the scale to coincide with the center of the cross-shaped knife groove 23, which is convenient for cutting.

[0031] The air intake channel 3 and the exhaust channel 4 are connected to the shell 2 on which the collection mechanism is installed through a snap-on structure. The upper and lower ends of the outer wall of the shell 2 are vertically provided with strip plugs 26. The lower end of the air intake channel 3 and the upper end of the exhaust channel 4 are respectively provided with strip grooves 27 that match the strip plugs on the outer wall of the shell 2. After the atmospheric particulate matter is collected, the shell 2 and the air intake channel 3 and the exhaust channel 4 can be directly disassembled by pulling, which is convenient and quick.

[0032] A transverse rod 28 is horizontally installed on the shell 2 below the mounting ring 21, and a limit ring 29 is arranged on the transverse rod 28 corresponding to the position of the push-pull rod 24. The lower end of the push-pull rod 24 is slidably connected to the limit ring 29, and an elastic buffer pad is arranged on the inner side of the limit ring 29. During detection, the lower end of the push-pull rod 24 is inserted into the limit ring 29 for fixing, thereby increasing the stability of the mesh plate 22 on the mounting ring 21. After the atmospheric particulate matter is collected, the shell 2 is disassembled from the air inlet channel 3 and the exhaust channel 4, and then the push-pull rod 24 is held to push the mesh plate 22 upward, thereby pressing the filter membrane 5 on the mesh plate 22 together with the filter membrane. The arc-shaped pressing plate 253 is pushed upward, so that the guide rods 251 on both sides of the ring 25 slide upward in the guide grooves 252 until the mesh plate 22 is pushed to the upper end of the shell 2 at a height that is convenient for taking out the filter membrane 5. During the upward movement of the mesh plate 22, the arc-shaped pressing plate 253 presses the filter membrane 5 against the mesh plate 22 to prevent movement or vibration. Then, the ring 25 together with the arc-shaped pressing plate 253 is pulled out from the top of the shell 2 by holding the guide rod 251. The mesh plate 22 together with the filter membrane 5 and the ring 25 can also be taken out together as needed. During the removal process, the arc-shaped pressing plate 253 is always pressed against the filter membrane 5 until it is moved to a suitable operating position.

[0033] The push-pull rod 24 is provided with a handle 241 for easy finger grasping, the mesh plate 22 is provided with a groove 221 for placing the filter membrane 5 and an annular groove 222 matching the shape of the ring 25, and the contact surface between the arc pressure plate 253 and the mesh plate 22 is provided with a convex ring and groove clamping structure 223 that cooperate with each other to ensure a stable connection between the two and prevent displacement.

[0034] A handle 33 is provided at the top of the guide rod 251, and a depression for inserting the handle is provided at the lower end of the air inlet passage 3. When the mesh plate 22, the filter membrane 5 and the arc-shaped pressure plate 253 are pushed upward together until they are taken out of the shell, the handle 33 at the top of the guide rod 251 can be pressed by hand to mortgage the arc-shaped pressure plate 253 on the filter membrane 5 so that the filter membrane 5 is always clamped between the mesh plate 22 and the arc-shaped pressure plate 253 during the movement, further preventing it from vibrating.

[0035] The exhaust passage 3 includes a cylinder 34 snap-connected to the lower end of the shell 2, a protective mesh cover 35 is provided at the lower end of the cylinder 34, a hole is provided on the support 01 for accommodating the shell 2 to pass through, the shell 2 is installed on the support 01 through the ear plate 20 of the side wall, the outer wall of the cylinder 34 is hingedly connected with a hook 341, and the support 01 is provided with a snap ring 342 that matches the hook 341. During inspection, the cylinder 34 is snap-connected to the lower end of the shell 2, and then the hook 341 is hung on the snap ring 342 to prevent the cylinder of the exhaust passage from falling downward.

[0036] When using the utility model for testing, first install the housing 2 on the support 01, place the mesh plate 22 on the mounting ring 21, then place the filter membrane 5 on the mesh plate 22, and insert the guide rod 251 from the top of the guide groove 252 downward into the guide groove 252, hold the guide rod 251 and press it down to slide it downward along the guide groove 252, driving the ring 25 at the lower end of the guide rod 251 to move downward until the arc pressure plate 253 arranged circumferentially on the inner side of the ring 25 presses the filter membrane 5 against the mesh plate 22. When cutting is required, the filter membrane 5 is placed on the plate 22 by observing the distance from the edge of the filter membrane 5 to the end of the knife groove, so that the center of the filter membrane 5 and the cross knife groove 23 coincide with each other, and the filter membrane 5 can be directly cut along the cross knife groove with a paper cutter. Since the filter membrane 5 is pressed between the arc-shaped pressing plate 253 and the mesh plate 22 at this time, the vibration of the filter membrane 5 during cutting can be reduced. At the same time, since the cross knife groove 23 divides the surface of the mesh plate 22 into four parts, the filter membrane 5 can be cut into two or four equal parts by cutting along the cross knife groove 23. When the atmospheric particulate matter on the filter membrane 5 is enriched, the air inlet channel 3 and the exhaust channel 4 can be removed from the shell 2, and the mesh plate 22 can be pushed upward by the push-pull rod 24 fixed to the bottom of the mesh plate 22. The mesh plate 22, together with the filter membrane 5 and the arc-shaped pressing plate 253, moves upward to a position where the filter membrane 5 is convenient to remove. Since the guide rod 251 always slides upward in the guide groove 252 during the process of pushing the mesh plate 22 upward, the filter membrane 5 moves smoothly with little vibration, and the filter membrane 5 always remains horizontal during the upward movement. When removing the filter membrane 5, the arc-shaped pressing plate 253 is pulled up by the guide rod 251. The arc-shaped pressing plate 253 can be pulled out of the shell 2 as needed to directly remove the filter membrane 5, or the mesh plate 22 can be pushed upward until it is taken out of the shell 2 together with the filter membrane 5 and the arc-shaped pressing plate 253. In this process, it is necessary to press the top of the guide rod 25 by hand to mortgage the arc-shaped pressing plate 253 on the filter membrane 5 so that the filter membrane is always clamped between the mesh plate 22 and the arc-shaped pressing plate 253 during the movement to prevent it from vibrating.

[0037] Example 2, reference Figure 4 , Figure 5 As a further optimized design of Example 1, guide rods 254 are provided at both ends of at least one of the cross-shaped knife grooves 23 on the circular ring 25, and guide tubes 255 are slidably fitted on the two guide rods 254 respectively, and a horizontal rod 256 is connected between the two guide tubes 255. A cross-shaped knife head 257 matching the cross-shaped knife groove 23 is connected in the middle of the horizontal rod 256 through a vertical rod. When it is necessary to take a quarter of the filter membrane 5 for digestion, the guide tube 255 can be fitted onto the guide rods 254, and the cross-shaped knife head 257 can be pressed downward by pressing the horizontal rod 256 to shear the filter membrane 5. During shearing, the cutting edge of the cross-shaped knife head 257 is inserted downward into the cross-shaped knife groove 23 to shear the filter membrane. Since the filter membrane 5 is always clamped between the arc pressure plate 253 and the mesh plate 22 during the shearing process, vibration during the shearing process can be avoided.

[0038] Example 3, reference Figure 6 , which is different from Example 1, is that the spacing between the outer circle of the mesh plate 22 and the inner diameter of the shell 2 is not greater than 1 mm, to prevent the mesh plate 22 from tilting or sliding left and right when the mesh plate 22 is pushed and pulled upward. Slide blocks 224 are provided on the left and right sides of the mesh plate 22 corresponding to the positions of the guide grooves 252. The mesh plate 22 is slidably connected to the guide grooves 252 through the slide blocks 224 to prevent the mesh plate 22 from rotating during the pushing and pulling process. A transverse rod is horizontally installed on the shell 2 below the mounting ring 21. The push-pull rod 24 is an electric push-pull rod. The bottom of the electric push-pull rod is fixed to the transverse rod, and the movable end of the electric push-pull rod 24 is connected to the bottom of the mesh plate 22.

[0039] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An atmospheric particulate matter detection and sampling device, characterized in that: The air filter assembly comprises a housing for mounting a collecting mechanism, a top and a bottom of the housing being connected with an air inlet passage and an air outlet passage respectively through a detachable sealing connection structure, a mounting ring being horizontally arranged on the inner wall of the housing, a mesh plate being mounted on the mounting ring, a diameter of the mesh plate being matched with an inner diameter of the housing, a cross-shaped knife groove being arranged on the upper surface of the mesh plate for dividing the plate surface into four parts, a push-pull rod being fixedly connected to the bottom of the mesh plate, a circular ring being arranged above the mesh plate, guide rods being symmetrically arranged on the left and right sides of the circular ring, guide grooves being arranged on the left and right sides of the housing, the guide rods being slidably connected in the guide grooves and the guide rods can be pulled out of the guide grooves from bottom to top, a plurality of arc-shaped pressure plates which can fix the filter membrane on the mesh plate are arranged in the circumferential gap on the inner side of the circular ring, and the arc-shaped pressure plates are arranged staggered with the cross-shaped knife grooves, and an air intake fan and a dehumidifier hook are arranged on the air inlet passage.

2. The atmospheric particulate matter detection and sampling device according to claim 1, characterized in that: The inner side of the shell is provided with a mark corresponding to the end position of the cross-shaped knife groove, and each knife groove of the cross-shaped knife groove is provided with a scale.

3. An atmospheric particulate matter detection sampling device as claimed in claim 1 or 2, characterized in that Slide blocks are arranged on the left and right sides of the mesh plate corresponding to the positions of the guide grooves, and the mesh plate is slidably connected with the guide grooves through the slide blocks.

4. The atmospheric particulate matter detection sampling device according to claim 3, characterized in that: A transverse rod is horizontally installed on the shell below the mounting ring. A limiting ring is arranged on the transverse rod corresponding to the position of the push-pull rod. The lower end of the push-pull rod is slidably connected in the limiting ring, and an elastic buffer pad is arranged inside the limiting ring.

5. The atmospheric particulate matter detection sampling device according to claim 3, characterized in that: A transverse rod is horizontally installed on the shell below the mounting ring. The push-pull rod is an electric push-pull rod. The bottom of the electric push-pull rod is fixed on the transverse rod, and the movable end of the electric push-pull rod is connected to the bottom of the mesh plate.

6. The atmospheric particulate matter detection and sampling device according to claim 1, characterized in that: The mesh plate is provided with a groove for accommodating the filter membrane and an annular groove matching the ring shape.

7. The atmospheric particulate matter detection and sampling device according to claim 1, characterized in that: The contact surfaces of the arc-shaped pressing plate and the mesh plate are provided with mutually matching convex ring and groove clamping structures to ensure a stable connection between the two and prevent displacement.

8. The atmospheric particulate matter detection and sampling device according to claim 2, characterized in that: Two guide rods are provided at the two ends of at least one of the cross-shaped knife grooves on the circular ring, and guide tubes are slidably fitted on the two guide rods respectively. A horizontal rod is connected between the two guide tubes, and a cross-shaped cutter head matching the cross-shaped knife groove is connected in the middle of the horizontal rod through a vertical rod.

9. The atmospheric particulate matter detection and sampling device according to claim 8, characterized in that: The cross-shaped cutter head is made of ceramic material.

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