An atmospheric particulate matter on-line monitoring device based on beta-ray method

Abstract

The present application relates to air quality detection technical field, disclose a kind of atmospheric particulate matter online monitoring device based on beta-ray method, comprising: box, box door is rotatably installed in one side of the box, temperature and humidity sensor is fixedly installed in the inner wall of the box, the air inlet pipe is passed through and arranged on the top of the box, the cutting head and diffusion dryer are communicated on the air inlet pipe, the hot air heated by electric heating wire is transported to heating cavity by heat tracing pipe through heat conduction component in the present application, heat is fully absorbed and stored by phase-change heat storage plate above heating cavity, when detection intermittent period device is idle, phase-change heat storage plate slowly releases the heat stored, the hot air current generated rises through the filter tape that the winding roller group is wound, and extension pipe directs hot air current to the detection zone filter tape between air inlet pipe and beta-ray component, maintain the continuous drying of the inside of box and filter tape, ensure that filter tape is always dry and the distance with beta-ray component is stable.

Description

Technical Field

[0001] This invention relates to the field of air quality detection technology, specifically to an online monitoring device for atmospheric particulate matter based on the β-ray method. Background Technology

[0002] Generally, monitoring requires the collection, retention, and mass concentration measurement of particulate matter in the atmosphere to reflect air quality in real time for use in environmental monitoring and pollution control. Mass concentration measurement is a crucial step in particulate matter monitoring, directly affecting the accuracy of monitoring data and the reliability of air quality assessment. Currently, the β-ray method is commonly used, where particulate matter in the atmosphere is retained on a filter to form a detection zone. β-rays emitted by a β-emitting component then penetrate the filter and the particulate matter, and the mass concentration of particulate matter is calculated based on the attenuation of the β-rays. However… In practice, the accuracy of beta-ray measurement relies primarily on the stable and consistent distance between the filter belt and the beta-emitting component. The filter belt is prone to undulation and floating during its movement, altering the distance between it and the beta-emitting component. This changes the length of the air path through which the beta rays pass, as well as the irradiation area and the detector's solid angle. This results in inconsistent geometric conditions between blank and dust-laden measurements, causing measurement drift. Furthermore, when the external environment is humid, the filter belt absorbs moisture and becomes heavier. Particulate matter also gains mass after absorbing water, and high-humidity gases condense on the filter belt surface. All this moisture is included in the beta-ray detection and counted as particulate matter mass, leading to inflated measurements. More importantly, the increased mass and fiber loosening of the filter belt after becoming damp cause it to droop closer to the beta-emitting component, further shortening the air attenuation path of the beta rays and altering the measurement geometry. The coupling interference of humidity and distance changes severely distorts the measurement results, failing to accurately reflect the concentration level of atmospheric particulate matter. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an online monitoring device for atmospheric particulate matter based on the β-ray method, thereby solving the technical problems in the prior art.

[0004] The objective of this invention can be achieved through the following technical solutions: An online monitoring device for atmospheric particulate matter based on the beta-ray method includes: The chamber has a door rotatably mounted on one side. A temperature and humidity sensor is fixedly mounted on the inner wall of the chamber. An air inlet pipe runs through the top of the chamber, and a cutting head and a diffusion dryer are connected to the air inlet pipe. A support frame is fixedly mounted inside the chamber, and an unwinding roller assembly is provided on the support frame. A filter belt is wound up on the unwinding roller assembly. A fixed platform is fixedly mounted on the support frame, and a beta-ray assembly is fixedly mounted on the fixed platform. The beta-ray assembly is located directly below the air outlet of the air inlet pipe, and the filter belt passes between the beta-ray assembly and the air inlet pipe. A heat tracing pipe is located inside the box and is sleeved on the outer circular surface of the cutting head. An electric heating wire is fixedly installed inside the heat tracing pipe. The mounting frame is fixedly installed on the bottom plate of the box. A heat storage component is provided on the mounting frame. The heat storage component includes a phase change heat storage plate, which is fixedly installed on the inner wall of the mounting frame. The heat tracing pipe is connected to the heat storage component through a heat conduction component. When the electric heating wire is turned on, the phase change heat storage plate absorbs and stores heat. When the electric heating wire is turned off, the phase change heat storage plate releases heat.

[0005] As a further aspect of the present invention: the heat storage component further includes two honeycomb meshes, both of which are fixedly installed on the inner wall of the mounting frame, and the phase change heat storage plate is located between the two honeycomb meshes.

[0006] As a further embodiment of the present invention: the heat-conducting component includes a heating chamber, a delivery pipe, a fan, a return pipe, and an air inlet. The heating chamber is located within the mounting frame, the phase change heat storage plate is located above the heating chamber, the heat tracing pipe is sequentially connected to the delivery pipe, the fan, the heating chamber, and the return pipe, and the other end of the return pipe is connected to the heat tracing pipe. The air inlet is located on the side frame of the mounting frame, and the heating chamber is connected to the interior of the housing through the air inlet.

[0007] As a further aspect of the present invention: the connection point between the delivery pipe and the heat tracing pipe is located on the outer circular surface of the top end of the heat tracing pipe.

[0008] As a further aspect of the present invention, the heat-conducting component further includes multiple baffles, all of which are fixedly installed inside the heating cavity.

[0009] As a further embodiment of the present invention: a vertical plate is fixedly installed on the mounting frame, an extension tube is provided in the vertical plate, the extension tube is connected to the heating chamber, and the air outlet of the extension tube faces the filter belt between the β-ray component and the air inlet pipe.

[0010] As a further embodiment of the present invention: a fixed frame is fixedly installed on the support frame, the fixed frame corresponds to the unwinding roller group, the bottom end of the fixed frame is connected to a first bracket by a spring, the top of the first bracket is slidably installed on the fixed frame by a limiting rod, and an abutment wheel is rotatably installed at the bottom end of the first bracket. The preload of the spring causes the first bracket to descend, and the abutment wheel abuts the filter belt against the unwinding roller group.

[0011] As a further embodiment of the present invention: two symmetrically arranged telescopic members are fixedly installed on the filter belt, a second bracket is fixedly installed on the movable end of the telescopic member, a lifting wheel is rotatably installed on the second bracket, the lifting wheel abuts against the bottom of the filter belt, and two symmetrically arranged vibrating heads are fixedly arranged on the filter belt, the vibrating heads abutting against the bottom of the filter belt.

[0012] The beneficial effects of this invention are: 1. In this invention, hot air heated by an electric heating wire is transported to the heating chamber via a heat tracing pipe and a heat-conducting component. The baffles arranged in the heating chamber cause the hot air to flow meanderingly along the plate surface and prolong the residence time. The phase change heat storage plate above the heating chamber fully absorbs and stores the heat. When the device is idle during the detection interval, the phase change heat storage plate slowly releases the stored heat. The generated hot airflow rises and passes through the unwinding roller group to wind the filter belt. The extension pipe directs the hot airflow towards the detection area filter belt between the air inlet pipe and the β-ray component, maintaining the continuous dryness of the box and the filter belt. This avoids the problems of increased weight, fiber loosening and deformation, and drooping and sticking to the β-ray component side after the filter belt becomes damp in the prior art. Zero-energy dehumidification is achieved during the idle period through heat storage and reuse, ensuring that the filter belt is always dry and the distance between it and the β-ray component is stable, thus improving the long-term stability of the monitoring data. 2. In this invention, the external humid air entering the intake pipe is pre-dehumidified by a diffusion dryer. When the external environment is humid, the electric heating wire is activated to heat the air in the heat tracing pipe to a high temperature. Heat exchange is carried out by relying on the pipe wall of the intake pipe to heat and dehumidify the air in the intake pipe that is about to enter the box, thereby reducing water vapor entering the detection area of ​​the filter belt and β-ray component from the source. 3. In this invention, the preload of the spring drives the first support to descend, causing the abutment wheel to abut the filter belt against the unwinding roller group. This allows both ends of the filter belt in the detection area to be clamped and fixed by the abutment wheel and the unwinding roller group, respectively, eliminating the undulation and floating of the filter belt during its movement. At the same time, the telescopic component actively pushes the second support to rise, causing the lifting wheel to abut against and push the filter belt upward. This adjusts the horizontal height of the filter belt between the air inlet pipe and the β-ray component, ensuring that the filter belt is always at the most suitable distance and height above the β-ray component. This guarantees that the distance between the filter belt and the β-ray component remains constant during each measurement, improving the accuracy and repeatability of particulate matter monitoring. Attached Figure Description

[0013] The invention will now be further described with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the box in this invention; Figure 3 This is a cross-sectional structural schematic diagram of the box body in this invention; Figure 4 This is a cross-sectional structural schematic diagram of the heat tracing pipe in this invention; Figure 5 This is a cross-sectional structural schematic diagram of the mounting frame in this invention; Figure 6 This is a schematic diagram of the internal structure of the heating cavity in this invention; Figure 7 This is a schematic diagram of the structure of the extension tube and filter belt in this invention; Figure 8 This is a schematic diagram of the support frame in this invention.

[0015] In the diagram: 1. Box body; 2. Box door; 3. Air inlet pipe; 4. Cutting head; 5. Diffusive dryer; 6. Temperature and humidity sensor; 7. Support frame; 701. Fixing frame; 702. First support; 703. Abutment wheel; 704. Spring; 8. Unwinding roller group; 9. Filter belt; 10. Fixing platform; 11. Beta ray assembly; 12. Heat tracing pipe; 13. Electric heating wire; 14. Mounting frame; 1401. Air inlet; 15. Heat storage assembly; 1501. Honeycomb mesh; 1502. Phase change heat storage plate; 16. Heating chamber; 17. Baffle plate; 18. Conveying pipe; 19. Fan; 20. Return pipe; 21. Vertical plate; 22. Extension pipe; 23. Vibrating head; 24. Telescopic component; 25. Second support; 26. Lifting wheel. Detailed Implementation

[0016] 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.

[0017] Please see Figures 1-8 As shown, the present invention is an online monitoring device for atmospheric particulate matter based on the β-ray method, comprising: A housing 1 has a door 2 rotatably mounted on one side. A temperature and humidity sensor 6 is fixedly mounted on the inner wall of the housing 1. An air inlet pipe 3 is installed through the top of the housing 1. A cutting head 4 and a diffusion dryer 5 are connected to the air inlet pipe 3. A support frame 7 is fixedly mounted inside the housing 1. An unwinding roller group 8 is provided on the support frame 7. A filter belt 9 is wound on the unwinding roller group 8. A fixed platform 10 is fixedly mounted on the support frame 7. A beta-ray assembly 11 is fixedly mounted on the fixed platform 10. The beta-ray assembly 11 is located directly below the air outlet of the air inlet pipe 3. The filter belt 9 passes between the beta-ray assembly 11 and the air inlet pipe 3. Heat tracing pipe 12, the heat tracing pipe 12 is located inside the housing 1, the heat tracing pipe 12 is sleeved on the outer circular surface of the cutting head 4, and an electric heating wire 13 is fixedly installed inside the heat tracing pipe 12; Mounting frame 14 is fixedly mounted on the bottom plate of housing 1. A heat storage component 15 is provided on the mounting frame 14. The heat storage component 15 includes a phase change heat storage plate 1502, which is fixedly mounted on the inner wall of the mounting frame 14. The heat tracing pipe 12 is connected to the heat storage component 15 through a heat conduction component. When the electric heating wire 13 is turned on, the phase change heat storage plate 1502 absorbs and stores heat. When the electric heating wire 13 is turned off, the phase change heat storage plate 1502 releases heat.

[0018] In one embodiment, it should be noted that the cutting head 4 and the diffusion dryer 5 described in this invention are both prior art. This invention does not improve them. Therefore, it is not necessary to disclose their specific mechanical and circuit structures, and this does not affect the integrity of this invention.

[0019] The working principle of this invention is as follows: First, the filter belt 9 is unwound by the unwinding roller group 8, simultaneously loosening and rewinding, thus moving the clean filter belt 9 between the air inlet pipe 3 and the β-ray assembly 11. Then, external air is drawn in through the air inlet pipe 3 for detection. The incoming external air passes through the cutting head 4 and the diffusion dryer 5. The cutting head 4 filters out large particles in the atmosphere that do not need to be detected, while the diffusion dryer 5 dehumidifies the external humid air before it enters the housing 1, reducing water vapor entering the detection area of ​​the filter belt 9 and the β-ray assembly 11 from the source. If the external ambient air is humid, the electric heating wire 13 needs to be activated to heat the air within the heat tracing pipe 12, thus... The heat tracing pipe 12 reaches a high temperature inside, and then heat exchange occurs through the wall of the air inlet pipe 3. This heats and dehumidifies the air about to enter the air inlet pipe 3. The dehumidified air enters through the air inlet pipe 3 and passes through the filter belt 9. The filter belt 9 intercepts the particulate matter to be detected in the air, and then emits beta rays through the beta ray assembly 11 to detect the atmospheric particulate matter on the filter belt 9. The mass concentration of particulate matter is calculated based on the attenuation of the beta rays, thereby determining the local air quality. This solves the problem in the prior art where water vapor enters the filter belt 9 in a humid external environment, causing the filter belt 9 to absorb moisture and increase in weight, resulting in inflated measurement values. It should be noted that when the electric heating wire 13 is activated, the heat tracing pipe 12 will... The component is connected to the heat storage assembly 15, transferring the heat from the air heated by the electric heating wire 13 inside the heat tracing pipe 12 to the phase change heat storage plate 1502 on the heat storage assembly 15. The phase change heat storage plate 1502 absorbs and stores the heat. Since particulate matter monitoring is intermittent, the device is idle when not monitoring. At this time, the phase change heat storage plate 1502 can slowly release the stored heat. The phase change heat storage plate 1502 is mounted on the mounting frame 14, which is located on the bottom plate inside the housing 1. The hot air generated by the released heat will rise and move upwards past the filter belt 9 wound by the upper unwinding roller group 8. The released heat can maintain the air circulation inside the housing 1 during the idle period of the entire device. The ambient temperature is maintained to keep the inside of the chamber 1 dry, thus keeping the filter belt 9 dry. This also prevents the filter belt 9 from becoming excessively wet, which could cause it to droop or come close to the beta-ray assembly 11 at the detection position between the air inlet pipe 3 and the beta-ray assembly 11. This solves the problems in the background technology where the filter belt 9 becomes heavier after getting damp, the fibers loosen and deform, and it droops and comes close to the beta-ray assembly, causing changes in distance and distortion of measurement geometry. In addition, the chamber 1 is equipped with a temperature and humidity sensor 6, which can actively monitor the ambient temperature and humidity inside the chamber 1. It can also actively turn on the electric heating wire 13 according to the actual situation, thereby heating and dehumidifying the inside of the chamber 1, realizing automatic temperature and humidity control of the environment inside the chamber 1.

[0020] like Figures 1-5As shown, in a preferred embodiment of the present invention, the heat storage component 15 further includes two honeycomb meshes 1501, both of which are fixedly installed on the inner wall of the mounting frame 14, and the phase change heat storage plate 1502 is located between the two honeycomb meshes 1501.

[0021] In practical application, the honeycomb mesh 1501 below the phase change heat storage plate 1502 can more evenly transport the rising heat into the phase change heat storage plate 1502 for storage, while the honeycomb mesh 1501 above can make the heat released by the phase change heat storage plate 1502 diffuse more evenly and comprehensively into the box 1, so that the hot airflow evenly covers the filter belt 9 above, improving the uniformity of the drying effect in the box 1 during the idle period.

[0022] like Figures 1-6 As shown, in a preferred embodiment of the present invention, the heat-conducting assembly includes a heating chamber 16, a delivery pipe 18, a fan 19, a return pipe 20, and an air inlet 1401. The heating chamber 16 is located within the mounting frame 14, and the phase change heat storage plate 1502 is located above the heating chamber 16. The heat tracing pipe 12 is sequentially connected to the delivery pipe 18, the fan 19, the heating chamber 16, and the return pipe 20. The other end of the return pipe 20 is connected to the heat tracing pipe 12. The air inlet 1401 is located on the side of the mounting frame 14, and the heating chamber 16 is connected to the interior of the housing 1 through the air inlet 1401.

[0023] In practical application, when the heat tracing pipe 12 is heated by the electric heating wire 13, the fan 19 is started to extract the hot air from the heat tracing pipe 12, which is then transported to the heating chamber 16 through the delivery pipe 18 and returned to the heat tracing pipe 12 through the return pipe 20, forming a hot air circulation loop. This allows the hot air to stay in the heating chamber 16, where the phase change heat storage plate 1502 above the heating chamber 16 fully absorbs and stores the heat. At the same time, air from the housing 1 is drawn into the heating chamber 16 through the air inlet 1401 to participate in the circulation, thus realizing the collection, storage and reuse of heat.

[0024] like Figures 1-4 As shown, in a preferred embodiment of the present invention, the connection between the delivery pipe 18 and the heat tracing pipe 12 is located on the outer circular surface of the top end of the heat tracing pipe 12.

[0025] In practical application, since hot air rises, the hot air accumulates most at the top of the heat tracing pipe 12 within the space inside the heat tracing pipe 12. By placing the connection between the delivery pipe 18 and the heat tracing pipe 12 at the top, the hottest air inside the heat tracing pipe 12 can be directly drawn and delivered, improving the efficiency of heat transfer to the heat storage component 15 and enabling the phase change heat storage plate 1502 to store heat more quickly.

[0026] like Figures 5-6As shown, in a preferred embodiment of the present invention, the heat-conducting component further includes a plurality of baffles 17, all of which are fixedly installed in the heating cavity 16.

[0027] In practical application, hot air enters the heating chamber 16 from the delivery pipe 18 and then exits the heating chamber 16 from the return pipe 20. When the hot air enters, it is blocked by the baffles 17 arranged in the heating chamber 16 and then flows in a meandering manner along the surface of the baffles 17, thereby slowing down and filling the space in the heating chamber 16. The hot air does not enter and exit directly. The longer residence time and the chaotic flow are conducive to the phase change heat storage plate 1502 fully absorbing heat and improving the heat storage efficiency.

[0028] like Figures 1-8 As shown, in a preferred embodiment of the present invention, a vertical plate 21 is fixedly installed on the mounting frame 14, and an extension tube 22 is provided in the vertical plate 21. The extension tube 22 is connected to the heating chamber 16, and the air outlet of the extension tube 22 faces the filter belt 9 between the β-ray component 11 and the air inlet pipe 3.

[0029] In practical application, the hot air in the heating chamber 16 rises, enters and exits through the extension tube 22, and the exited hot airflow directly faces the filter belt 9 located between the air inlet tube 3 and the β-ray assembly 11. This continuously dries the filter belt 9 in the detection area, ensuring that the filter belt 9 in the detection area is always dry. This avoids the problem of deteriorating detection results due to moisture, and also avoids the problem of the filter belt 9 becoming heavier due to moisture, which would shorten the distance between the β-ray assembly 11 and the filter belt 9 and change the measurement geometry. This ensures that the distance between the filter belt 9 and the β-ray assembly 11 is stable and consistent.

[0030] like Figures 1-8 As shown, in a preferred embodiment of the present invention, a fixed frame 701 is fixedly installed on the support frame 7. The fixed frame 701 corresponds to the unwinding roller group 8. The bottom end of the fixed frame 701 is connected to a first bracket 702 through a spring 704. The top of the first bracket 702 is slidably installed on the fixed frame 701 through a limiting rod. An abutment wheel 703 is rotatably installed at the bottom end of the first bracket 702. The preload of the spring 704 causes the first bracket 702 to descend, and the abutment wheel 703 abuts the filter belt 9 against the unwinding roller group 8.

[0031] Specifically, two symmetrically arranged telescopic members 24 are fixedly installed on the filter belt 9. A second bracket 25 is fixedly installed on the movable end of the telescopic member 24. A lifting wheel 26 is rotatably installed on the second bracket 25. The lifting wheel 26 abuts against the bottom of the filter belt 9. Two symmetrically arranged vibrating heads 23 are fixedly installed on the filter belt 9. The vibrating heads 23 abut against the bottom of the filter belt 9.

[0032] In one embodiment, the telescopic member 24 may be an electric cylinder, an electric telescopic rod, or other mechanisms capable of lifting and lowering. This embodiment does not impose any specific limitations on these components.

[0033] In practical application, the preload of spring 704 drives the first support 702 to descend, causing the abutment wheel 703 to abut against the filter belt 9. Combined with the winding of the unwinding roller group 8, this ensures that both ends of the filter belt 9 in the detection area are clamped by the abutment wheel 703 and the unwinding roller group 8, resulting in greater stability and preventing the filter belt 9 from floating in the detection area. This ensures a stable and consistent distance between the filter belt 9 and the β-ray assembly 11. Furthermore, when air is drawn in for detection, the vibrating head 23 can be activated to vibrate the filter belt 9, causing the atmospheric particles trapped on the filter belt 9 to disperse evenly, preventing particle contamination. The accumulation of particulate matter causes the beta rays emitted by the beta ray assembly 11 to be blocked, resulting in poor detection results. At the same time, a telescopic component 24 is also provided, which can actively push the second support 25 to rise, so that the lifting wheel 26 abuts against and pushes the filter belt 9 to rise. In this way, the horizontal height of the filter belt 9 between the air inlet pipe 3 and the beta ray assembly 11 is adjusted to ensure that the filter belt 9 is always at the most suitable distance and height above the beta ray assembly 11. This solves the problems in the background technology of the filter belt 9 floating and undulating during the belt movement, causing changes in distance, inconsistencies in the geometric conditions of blank measurement and dust-laden measurement, and drift of measurement values.

[0034] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. An online monitoring device for atmospheric particulate matter based on the β-ray method, characterized in that, include: A box body (1) is provided with a door (2) that is rotatably installed on one side of the box body (1). A temperature and humidity sensor (6) is fixedly installed on the inner wall of the box body (1). An air inlet pipe (3) is provided through the top of the box body (1). A cutting head (4) and a diffusion dryer (5) are connected to the air inlet pipe (3). A support frame (7) is fixedly installed inside the box body (1). An unwinding roller group (8) is provided on the support frame (7). A filter belt (9) is wound on the unwinding roller group (8). A fixed platform (10) is fixedly installed on the support frame (7). A beta-ray assembly (11) is fixedly installed on the fixed platform (10). The beta-ray assembly (11) is located directly below the air outlet of the air inlet pipe (3). The filter belt (9) passes between the beta-ray assembly (11) and the air inlet pipe (3). Heat tracing pipe (12), the heat tracing pipe (12) is located inside the box (1), the heat tracing pipe (12) is sleeved on the outer circular surface of the cutting head (4), and an electric heating wire (13) is fixedly installed inside the heat tracing pipe (12). The mounting frame (14) is fixedly installed on the bottom plate of the box (1). A heat storage component (15) is provided on the mounting frame (14). The heat storage component (15) includes a phase change heat storage plate (1502). The phase change heat storage plate (1502) is fixedly installed on the inner wall of the mounting frame (14). The heat tracing pipe (12) is connected to the heat storage component (15) through a heat conduction component. When the electric heating wire (13) is turned on, the phase change heat storage plate (1502) absorbs and stores heat. When the electric heating wire (13) is turned off, the phase change heat storage plate (1502) releases heat.

2. The online monitoring device for atmospheric particulate matter based on the β-ray method according to claim 1, characterized in that, The heat storage component (15) also includes two cellular meshes (1501), both of which are fixedly installed on the inner wall of the mounting frame (14), and the phase change heat storage plate (1502) is located between the two cellular meshes (1501).

3. The online monitoring device for atmospheric particulate matter based on the β-ray method according to claim 1, characterized in that, The heat-conducting assembly includes a heating chamber (16), a delivery pipe (18), a fan (19), a return pipe (20), and an air inlet (1401). The heating chamber (16) is located inside the mounting frame (14). The phase change heat storage plate (1502) is located above the heating chamber (16). The heat tracing pipe (12) is connected in sequence to the delivery pipe (18), the fan (19), the heating chamber (16), and the return pipe (20). The other end of the return pipe (20) is connected to the heat tracing pipe (12). The air inlet (1401) is located on the side of the mounting frame (14). The heating chamber (16) is connected to the inside of the housing (1) through the air inlet (1401).

4. The online monitoring device for atmospheric particulate matter based on the β-ray method according to claim 3, characterized in that, The connection between the delivery pipe (18) and the heat tracing pipe (12) is located on the outer circular surface of the top end of the heat tracing pipe (12).

5. The online monitoring device for atmospheric particulate matter based on the β-ray method according to claim 3, characterized in that, The heat-conducting component also includes multiple baffles (17), which are fixedly installed inside the heating chamber (16).

6. The online monitoring device for atmospheric particulate matter based on the β-ray method according to claim 1, characterized in that, A vertical plate (21) is fixedly installed on the mounting frame (14). An extension tube (22) is provided inside the vertical plate (21). The extension tube (22) is connected to the heating chamber (16), and the air outlet of the extension tube (22) faces the filter belt (9) between the β-ray assembly (11) and the air inlet pipe (3).

7. The online monitoring device for atmospheric particulate matter based on the β-ray method according to claim 1, characterized in that, A fixed frame (701) is fixedly installed on the support frame (7). The fixed frame (701) corresponds to the unwinding roller group (8). The bottom end of the fixed frame (701) is connected to a first bracket (702) through a spring (704). The top of the first bracket (702) is slidably installed on the fixed frame (701) through a limiting rod. The bottom end of the first bracket (702) is rotatably installed with an abutment wheel (703). The preload of the spring (704) causes the first bracket (702) to descend. The abutment wheel (703) abuts the filter belt (9) against the unwinding roller group (8).

8. The online monitoring device for atmospheric particulate matter based on the β-ray method according to claim 7, characterized in that, Two symmetrically arranged telescopic components (24) are fixedly installed on the filter belt (9). A second bracket (25) is fixedly installed on the movable end of the telescopic component (24). A lifting wheel (26) is rotatably installed on the second bracket (25). The lifting wheel (26) abuts against the bottom of the filter belt (9). Two symmetrically arranged vibrating heads (23) are fixedly installed on the filter belt (9). The vibrating heads (23) abut against the bottom of the filter belt (9).

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