Stationary pollution source gaseous pollutant sampling device and sampling method thereof

Abstract

The invention relates to the related technical field of pollutant sampling, in particular to a stationary pollution source gaseous pollutant sampling device and a sampling method thereof.The stationary pollution source gaseous pollutant sampling device comprises a sampling base frame, a connecting pipe arranged in the sampling base frame and a sampling barrel arranged at the top of the sampling base frame; the surrounding stirring assembly is used for driving the sampling head to perform surrounding motion and reciprocating stirring in the sampling cylinder; the surrounding stirring assembly comprises an annular bottom plate, a driving gear and a limiting base, and an S-shaped stirring groove is formed in the inner side of the annular bottom plate, it is ensured that the whole circulation section of the sampling barrel is covered without dead corners through the three-dimensional spiral movement track of the sampling head, gas in the edge area and the center area can be captured at the same time, and the sampling efficiency is improved. Through a two-stage filtering mode of a blocking brush and a filtering net plate adopted by the filtering blocking assembly, particulate matters with different particle sizes are effectively intercepted, and dual protection is provided for a precise sampling head and a subsequent gas path.

Description

Technical Field

[0001] This invention relates to the field of pollutant sampling technology, and in particular to a sampling device and sampling method for gaseous pollutants from stationary pollution sources. Background Technology

[0002] In fields such as industrial safety and environmental monitoring, reliable sampling and detection of carbon monoxide is a core means of preventing accidents. However, the gas in actual working conditions often contains high concentrations of dust, oil mist and other impurities, and the flow rate and composition are uneven, which poses a serious challenge to the accuracy and service life of the sampling head.

[0003] Currently, common sampling heads lack effective flow field optimization. While some use fixed flow disturbance components to promote gas mixing, the disturbance method is coarse, resulting in significant pressure loss and difficulty in ensuring uniform gas distribution on the sensor surface. This leads to the detection value being merely a measurement of the gas under a certain flow state, failing to reflect the true and uniform average concentration. This is especially problematic in pipes and enclosed spaces where gas components are stratified or unevenly distributed, easily leading to deviations in the detection results. Furthermore, the filtration mechanisms of existing sampling heads exhibit poor adaptability to fluctuations in particulate matter concentration. Their filters are prone to clogging, causing sampling flow rate attenuation and affecting sampling continuity. Simultaneously, the cleaning capacity of the filter components is limited. When dealing with highly polluted gases, their fixed unfolded area and filtration capacity are insufficient to effectively block them, causing particulate matter to continuously accumulate in the flow channel. This problem not only alters the flow channel characteristics and increases system resistance but also directly contaminates the sensor's optical window or reaction interface, severely interfering with the accuracy and reliability of the final detection results. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a sampling device and sampling method for gaseous pollutants from stationary pollution sources.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a sampling device for gaseous pollutants from a fixed pollution source, comprising a sampling base frame, a connecting pipe disposed inside the sampling base frame, and a sampling cylinder disposed on the top of the sampling base frame. The sampling cylinder is connected through the top end of the connecting pipe. A sampling head is movably disposed at the bottom of the inner part of the sampling cylinder. A circumferential actuation component is disposed inside the sampling cylinder. The circumferential actuation component is used to drive the sampling head to perform circumferential movement and reciprocating actuation inside the sampling cylinder. The surrounding actuation assembly includes an annular base plate, a drive gear, and a limiting base. An S-shaped actuation groove is provided on the inner side of the annular base plate. When the drive gear drives the sampling head to rotate, the sampling head reciprocates axially along the limiting base under the constraint and guidance of the S-shaped actuation groove. A turbulence fanning component is provided at the top inner part of the sampling tube. The turbulence fanning component is used to fan the sampling gas around the sampling head and to turbulently disperse the sampling gas inside the sampling tube. The arc-shaped fanning plate in the turbulence fanning component moves at the top inner part of the sampling tube. A filter screen is fixedly installed at the bottom of the inner part of the connecting tube. A filter blocking assembly is set at the bottom of the inner part of the connecting tube. The filter blocking assembly is used to filter and block impurities in the gas entering the sampling tube. The filter blocking assembly includes a fixed tube, a blocking brush and a cleaning brush. The fixed cylinder is equipped with a brush cleaning component, which is used to clean the blocking brush and the blockage impurities at the bottom of the filter screen.

[0006] As a preferred embodiment of the present invention, the surrounding actuation assembly further includes a rotary motor installed at the bottom of the outer side of the sampling tube, an annular groove is provided on the top of the annular base plate, an annular slider is slidably connected in the annular groove, and a rotary gear is fixedly installed between the tops of the annular sliders. A drive gear is fixedly installed on the output end of the rotary motor, and the drive gear and the rotary gear are movably meshed.

[0007] A limiting base is installed on the top of the rotating toothed disc. A limiting sliding plate is slidably connected inside the limiting base. An arc-shaped actuating rod is fixedly installed at the bottom of the limiting sliding plate. The size of the arc-shaped actuating rod matches the S-shaped actuating groove, and the arc-shaped actuating rod moves within the S-shaped actuating groove. A connecting ring is fixedly installed at the end of the arc-shaped actuating rod away from the limiting base. A first conduit is movably connected inside the connecting ring, and the sampling head is installed at the bottom of the first conduit. A negative pressure fan is connected to the top of the first conduit through a telescopic conduit, and the negative pressure fan is located outside the sampling cylinder.

[0008] As a preferred embodiment of the present invention, an exhaust fan is fixedly installed on the top side of the sampling tube. The exhaust fan absorbs and discharges the gas inside the sampling tube and the connecting pipe, generating negative pressure inside the sampling tube and the connecting pipe. The turbulence fan assembly also includes a fixed rack and a fixed gear plate. A turbulence frame is fixedly installed on the top inner side of the sampling tube. The turbulence frame is movably connected to the fixed gear plate through a rotating shaft. An electric telescopic rod is fixedly installed on the top of the turbulence frame by bolts.

[0009] The fixed gear plate has an arc-shaped fan rod fixedly installed on the side away from the spoiler frame, and the arc-shaped fan plate is evenly installed at the bottom of the arc-shaped fan rod. The spoiler frame has a limit groove, and a T-shaped connecting block is slidably connected in the limit groove. The bottom of the T-shaped connecting block passes through the spoiler frame and a fixed rack is fixedly installed there. The fixed gear plate is movably engaged with both sides of the fixed rack. The top of the T-shaped connecting block is fixedly installed on the electric telescopic rod.

[0010] As a preferred embodiment of the present invention, a drive motor is fixedly installed at the bottom inner part of the sampling base frame, a connecting rod is fixedly installed at the output end of the drive motor, and a fixed cylinder is fixedly installed at the top end of the connecting rod. The filter blocking assembly also includes a fan-shaped blocking plate, a plurality of blocking brushes are evenly installed on the outer periphery of the fan-shaped blocking plate, a connecting rod is installed around the bottom of the fixed cylinder, the bottom of the fan-shaped blocking plate is movably connected to the connecting rod, and there are three sets of fan-shaped blocking plates. A cleaning plate is movably arranged on the top outer side of the fixed cylinder, and cleaning brushes are evenly installed at the top of the cleaning plate. The fan-shaped blocking plate is evenly provided with a plurality of blocking holes.

[0011] As a preferred embodiment of the present invention, the brush cleaning assembly includes a servo motor fixedly installed at the bottom of the fixed cylinder, a screw fixedly installed at the output end of the servo motor, an adjusting block threaded through the screw, a hinge rod movably connected between the adjusting block and the fan-shaped baffle plate via a hinge, an adjusting groove matching the size of the hinge rod being opened in the fixed cylinder, and the hinge rod movably passing through the adjusting groove, and an inclined arc-shaped scraper is provided around the bottom of the connecting pipe, the arc-shaped scraper scraping and cleaning the baffle brush.

[0012] An L-shaped adjusting rod is fixedly installed on the top of the adjusting block, and the top of the L-shaped adjusting rod extends through to the outer side of the top of the fixed cylinder. The cleaning plate is fixedly installed at the top of the L-shaped adjusting rod, and there are three sets of cleaning plates. The cleaning brush and the bottom of the filter screen plate move against each other. An air inlet pipe is connected through to the bottom of the sampling base frame. The air inlet pipe is connected through to the bottom of the connecting pipe. A heating ring is wrapped around the outer periphery of the air inlet pipe, and the connecting pipe is located at the inner bottom of the sampling base frame.

[0013] As a preferred embodiment of the present invention, a sampling method for a stationary pollution source gaseous pollutant sampling device includes the following steps: S1. Install the air inlet pipe at the sampling point of the fixed pollution source, and activate the heating ring inside the sampling base frame to preheat the air inlet pipe and connecting pipe. S2. Turn on the negative pressure fan and exhaust fan to form a stable negative pressure in the sampling tube and connecting pipe. Under the action of negative pressure, the gas to be tested is drawn in through the air inlet pipe and enters the sampling tube through the connecting pipe. The sampling head discharges the sampling gas into the detection tube through the negative pressure fan, telescopic tube and first tube. The gas passes through the filter blocking assembly. The fan-shaped baffle plate, together with the blocking brush and blocking holes, blocks the impurities contained in the gas. Then it passes through the filter screen plate for final fine filtration. S3. The rotary motor drives the drive gear to move, which drives the rotating gear disk meshing with it to rotate in the annular groove of the annular base plate. The limiting base fixed on the rotating gear disk rotates synchronously, driving the sampling head to make a circular motion inside the sampling tube. The arc-shaped actuating rod installed at the bottom of the limiting sliding plate generates a regular axial reciprocating motion under the constraint of the S-shaped actuating groove of the annular base plate. This motion is transmitted to the sampling head through the connecting ring and the first conduit. The sampling head realizes the revolution around the inner wall of the sampling tube and the reciprocating insertion along the tube diameter direction. The sampling head covers the three-dimensional spiral sampling trajectory of the entire cross-section of the sampling tube. S4. During the sampling process, the turbulence fan assembly is activated to control the electric telescopic rod to perform reciprocating telescopic motion, which in turn drives the T-shaped connecting block and the fixed rack to move horizontally. The fixed rack drives the fixed gear plate that meshes with it to rotate reciprocally, thereby driving the arc-shaped fan rod and its bottom arc-shaped fan plate to fan at the top inside the sampling tube. S5. During sampling intervals or standby, the servo motor in the brush cleaning assembly is activated. The servo motor drives the screw to rotate, causing the adjusting block to rise inside the fixed cylinder. The adjusting block controls the three sets of fan-shaped baffles to open synchronously via the hinge rod. At the same time, the cleaning plate rises synchronously via the L-shaped adjusting rod, and the cleaning brush comes into contact with the filter screen. The drive motor, in conjunction with the connecting rod, drives the fixed cylinder and the fan-shaped baffles to rotate. During the rotation, the arc-shaped scraper scrapes and removes the impurities adhering to the baffle brush. Simultaneously, the cleaning brush cleans the bottom of the filter screen. After the rotation and brushing, the fan-shaped baffles and the cleaning brush return to their original positions.

[0014] Compared with the prior art, the beneficial effects that this invention can achieve are: In this invention, two motion components, revolution and radial reciprocation, are achieved through a surrounding toggle component and combined into a composite motion that makes the sampling head trajectory present a three-dimensional spiral. This ensures that within one motion cycle, the sampling head can both approach the inner wall area of ​​the sampling tube and effectively penetrate to the central area, achieving high-density traversal sampling of the entire cross-section of the sampling tube without dead angles. The three-dimensional spiral motion trajectory of the sampling head ensures coverage of the entire flow section of the sampling tube without dead angles, and can simultaneously capture gas in the edge and central areas. This completely solves the sampling deviation caused by uneven airflow distribution, enabling the sample to truly reflect the overall average concentration of the measured gas.

[0015] In this invention, the active stirring action of the turbulence fan component quickly breaks down any potential temperature or concentration stratification, ensuring that the gas reaches a highly homogeneous state before sampling. This guarantees that the gas collected by the sampling head at any given moment has a consistent and representative composition. A controllable vortex is actively created at the top of the sampling cylinder to forcibly stir and mix the gas inside, rapidly breaking down any potential temperature or concentration stratification and ensuring that the gas composition reaches a highly homogeneous state in a very short time. This effectively avoids measurement errors introduced by instantaneous concentration fluctuations or gradients.

[0016] In this invention, the two-stage filtration mode of the filter blocking component, consisting of a blocking brush and a filter screen, effectively intercepts particles of different sizes, providing dual protection for the precision sampling head and subsequent gas path. It can promptly remove accumulated impurities, restore filtration efficiency, and fundamentally solve the problem of flow attenuation and sampling interruption caused by filter clogging in traditional equipment, greatly improving the long-term operational reliability under harsh conditions.

[0017] In this invention, the servo motor drives the screw in the brush cleaning assembly to rotate, causing the adjusting block to move upward. The adjusting block then pushes three sets of fan-shaped baffles through a hinged rod, causing the baffles to open outward synchronously. The drive motor then rotates the fixed cylinder, allowing the baffle brushes on the opened fan-shaped baffles to scrape against each other, achieving self-cleaning. Simultaneously with the adjusting block's ascent, the L-shaped adjusting rod fixed to its top also rises synchronously. The top of the L-shaped adjusting rod penetrates the top of the fixed cylinder and is fixedly connected to the cleaning plate. Therefore, the cleaning plate and the cleaning brushes mounted on it rise until the cleaning brushes are in close contact with the bottom of the filter screen. The drive motor then rotates the fixed cylinder, allowing the cleaning brushes to perform a rotating brushing of the filter screen, achieving comprehensive cleaning of the baffle brushes, cleaning brushes, and filter screen.

[0018] In this invention, impurities and particulate matter in the sampled gas are efficiently intercepted by a fan-shaped baffle plate and its surface-mounted baffle brush and perforated structure, effectively preventing them from entering the sampling cylinder. This significantly improves the detection accuracy of the sampling head and extends its service life. The gas that has passed through the initial interception then enters the filter plate stage for deep and fine filtration, further ensuring the cleanliness and purity of the sampled gas and meeting the requirements of high-precision analysis. The fan-shaped baffle plate is dynamically adjusted by raising and lowering the adjustment block driven by a servo motor to enhance its ability to intercept pollutants. This allows for flexible handling of sampling scenarios with different gas compositions and pollution levels. By changing the degree of expansion of the fan-shaped baffle plate, graded filtration and adaptive filtration efficiency are achieved, ensuring reliable sampling and long-term stable operation under various complex working conditions. Attached Figure Description

[0019] Figure 1This 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 sampling base frame of the present invention; Figure 3 This is a schematic diagram of the drive gear structure of the present invention; Figure 4 This is a schematic diagram of the rotating gear disk of the present invention; Figure 5 This is a schematic diagram of the structure of the filter screen of the present invention; Figure 6 This is a schematic diagram of the sampling head of the present invention; Figure 7 This is a schematic diagram of the fixed gear disc structure of the present invention; Figure 8 This is a schematic diagram of the structure of the fan-shaped baffle plate of the present invention; Figure 9 This is a schematic diagram of the internal structure of the fixed cylinder of the present invention.

[0020] The components include: 10. Sampling base frame; 11. Connecting pipe; 12. Sampling cylinder; 13. Sampling head; 14. Connecting ring; 15. First conduit; 16. Telescopic conduit; 17. Negative pressure fan; 18. Exhaust fan; 19. Inlet pipe; 20. Annular base plate; 21. Annular groove; 22. Annular slider; 23. Rotary motor; 24. Drive gear; 25. Rotary gear plate; 26. Limiting base; 27. Limiting sliding plate; 28. Arc-shaped actuating rod; 29. ​​S-shaped actuating groove; 30. Arc-shaped fan plate; 31. Baffle frame; 32. Solid... 33. Fixed gear plate; 34. Electric telescopic rod; 35. Arc-shaped fan-shaped rod; 36. Limiting groove; 37. T-shaped connecting block; 48. Fixed rack; 49. Drive motor; 40. Connecting rotating rod; 41. Fixed cylinder; 42. Servo motor; 43. Screw; 44. Adjusting block; 45. Adjusting groove; 46. Hinge rod; 47. Connecting rod; 58. Fan-shaped baffle plate; 59. Baffle brush; 50. Baffle hole; 51. Cleaning plate; 52. Cleaning brush; 53. L-shaped adjusting rod; 54. Arc-shaped scraper; 55. Filter screen plate; 60. Heating ring. Detailed Implementation

[0021] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0022] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a fixed pollution source gaseous pollutant sampling device includes a sampling base frame 10, a connecting pipe 11 disposed inside the sampling base frame 10, and a sampling cylinder 12 disposed on the top of the sampling base frame 10. The sampling cylinder 12 is connected through the top end of the connecting pipe 11. A sampling head 13 is movably disposed at the bottom of the sampling cylinder 12. A circumferential actuation component is disposed inside the sampling cylinder 12. The circumferential actuation component is used to drive the sampling head 13 to perform circumferential motion and reciprocating motion inside the sampling cylinder 12. The circumferential actuation component includes an annular base plate 20, a drive gear 24, and a limiting base 26. An S-shaped actuation groove 29 is opened on the inner side of the annular base plate 20. When the drive gear 24 drives the sampling head 13 to rotate, the sampling head 13 performs axial reciprocating motion along the limiting base 26 under the constraint and guidance of the S-shaped actuation groove 29. See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The surrounding actuation assembly also includes a rotary motor 23 installed at the bottom of the outer side of the sampling tube 12. An annular groove 21 is provided on the top of the annular base plate 20. An annular slider 22 is slidably connected in the annular groove 21. A rotary gear disk 25 is fixedly installed between the tops of the annular slider 22. A drive gear 24 is fixedly installed on the output end of the rotary motor 23. The drive gear 24 and the rotary gear disk 25 are in movable meshing.

[0023] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 A limiting base 26 is installed on the top of the rotating toothed disk 25. A limiting sliding plate 27 is slidably connected inside the limiting base 26, which ensures that the rotating toothed disk 25 can obtain stable radial support and can rotate flexibly around the axis of the sampling cylinder 12. An arc-shaped actuating rod 28 is fixedly installed at the bottom of the limiting sliding plate 27. The size of the arc-shaped actuating rod 28 matches the S-shaped actuating groove 29, and the arc-shaped actuating rod 28 moves in the S-shaped actuating groove 29. A connecting ring 14 is fixedly installed at the end of the arc-shaped actuating rod 28 away from the limiting base 26. A first conduit 15 is movably connected inside the connecting ring 14, and the sampling head 13 is installed at the bottom of the first conduit 15. The top of the first conduit 15 is connected to a negative pressure fan 17 through a telescopic conduit 16, and the negative pressure fan 17 is located outside the sampling cylinder 12.

[0024] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The rotary motor 23 drives the drive gear 24 of the sampling cylinder 12 to rotate. The drive gear 24 meshes with the outer edge teeth of the rotating gear disk 25. The rotating gear disk 25 slides through the annular slider 22 at its bottom and the annular groove 21 at the top of the annular base plate 20. The rotating gear disk 25 will rotate smoothly and stably inside the sampling cylinder 12. The limiting base 26 is fixed to the top of the rotating gear disk 25. The limiting sliding plate 27 is slidably installed inside the limiting base 26. The upper end of the arc-shaped actuating rod 28 is fixed to the bottom of the limiting sliding plate 27, and the lower end is embedded and slidably connected in the S-shaped actuating groove 29. The sampling head 13 is connected to the arc-shaped actuating rod 28 through the first guide tube 15 and the connecting ring 14. The top of the rod 28 is movably connected. During operation, the rotary motor 23 drives the drive gear 24 to rotate, which in turn meshes with and drives the rotary gear disk 25 to rotate. At the same time, the S-shaped actuation groove 29 forces the arc-shaped actuation rod 28 to drive the limiting sliding plate 27 and the sampling head 13 to perform axial reciprocating motion, ultimately synthesizing a three-dimensional spiral sampling trajectory. That is, within one revolution cycle of the rotary gear disk 25, the motion trajectory of the sampling head 13 is a three-dimensional spiral line wrapped inside the sampling cylinder 12. It can sample close to the cylinder wall and also penetrate to the central area for sampling, realizing sampling of the entire cross-section of the sampling cylinder 12 without dead angles, expanding the sampling area and improving the sampling accuracy.

[0025] See Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 A turbulence fan assembly is provided at the top inner part of the sampling cylinder 12. The turbulence fan assembly is used to fan the sampling gas around the sampling head 13 and to turbulently disperse the sampling gas inside the sampling cylinder 12. The arc-shaped fan plate 30 in the turbulence fan assembly is movable at the top inner part of the sampling cylinder 12. An exhaust fan 18 is fixedly installed on the top side of the sampling cylinder 12. The exhaust fan 18 absorbs and discharges the gas in the sampling cylinder 12 and the connecting pipe 11, generating negative pressure inside the sampling cylinder 12 and the connecting pipe 11. The turbulence fan assembly also includes a fixed rack 37 and a fixed gear plate 32. A turbulence frame 31 is fixedly installed at the top inner part of the sampling cylinder 12. The turbulence frame 31 is movably connected to the fixed gear plate 32 through a rotating shaft. An electric telescopic rod 33 is fixedly installed on the top of the turbulence frame 31 by bolts. The reciprocating electric telescopic rod 33 drives the fixed rack 37 to perform stable horizontal back-and-forth movement.

[0026] See Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7The fixed gear 32 has an arc-shaped fan rod 34 fixedly installed on the side away from the spoiler 31, and the arc-shaped fan plate 30 is evenly installed at the bottom of the arc-shaped fan rod 34. The spoiler 31 has a limit groove 35, and a T-shaped connecting block 36 is slidably connected in the limit groove 35. The bottom of the T-shaped connecting block 36 passes through the spoiler 31 and a fixed rack 37 is fixedly installed. The fixed gear 32 is movably engaged on both sides of the fixed rack 37. The top of the T-shaped connecting block 36 is fixedly installed on the electric telescopic rod 33.

[0027] See Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 During the circumferential sampling process of the sampling head 13, the telescopic end of the electric telescopic rod 33 on the baffle frame 31 drives the T-shaped connecting block 36 to move stably horizontally in the limiting groove 35. The bottom of the T-shaped connecting block 36 drives the fixed rack 37 to move stably horizontally through the limiting groove 35. The fixed rack 32 is movably connected to the bottom of the baffle frame 31 through a rotating shaft and is engaged with the fixed rack 37. When the electric telescopic rod 33 reciprocates, it pushes the T-shaped connecting block 36 and the fixed rack 37 to move horizontally and reciprocally in a linear motion. The fixed rack 37 drives the fixed rack 32, which is engaged with it, to rotate reciprocally. The rotation of the fixed rack 32 is transmitted to the arc-shaped fan plate 30, which is uniformly installed on it, through the arc-shaped fan rod 34, so that it swings in a fan shape in the vertical plane, agitates the gas, generates a controllable vortex in the upper part of the sampling cylinder 12, actively breaks the gas stratification, realizes rapid homogenization of the sampled gas, and ensures the uniformity and representativeness of the gas composition at the moment of each sampling.

[0028] See Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 8 and Figure 9A filter screen 57 is fixedly installed at the inner bottom of the connecting pipe 11. A filter blocking assembly is provided at the inner bottom of the connecting pipe 11. The filter blocking assembly is used to filter and block impurities in the gas entering the sampling tube 12. The filter blocking assembly includes a fixed cylinder 42, a blocking brush 51, and a cleaning brush 54. A drive motor 40 is fixedly installed at the inner bottom of the sampling base frame 10. A connecting rod 41 is fixedly installed at the output end of the drive motor 40, and the fixed cylinder 42 is fixedly installed at the top end of the connecting rod 41. The filter blocking assembly also includes a fan-shaped blocking plate 5. 0. Several blocking brushes 51 are evenly installed on the outer periphery of the fan-shaped baffle plate 50. Connecting rods 48 are installed around the bottom of the fixed cylinder 42. The bottom of the fan-shaped baffle plate 50 is movably connected to the connecting rods 48. There are three sets of fan-shaped baffle plates 50. A cleaning plate 53 is movably installed on the outer side of the top of the fixed cylinder 42. Cleaning brushes 54 are evenly installed on the top of the cleaning plate 53. Several blocking holes 52 are evenly opened on the fan-shaped baffle plate 50. The blocking holes 52 are used in conjunction with the blocking brushes 51 to filter and block the sampling gas in the connecting pipe 11.

[0029] See Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 8 and Figure 9 The fan-shaped baffle 50 uses its blocking brush 51 and blocking holes 52 to block impurities and particles in the sampled gas, effectively preventing them from entering the sampling cylinder 12 and improving the detection accuracy of the sampling head 13. It also provides excellent protection for the sampling head 13. The initially filtered sampled gas then undergoes fine filtration through the filter screen 57, improving the cleanliness and purity of the sampled gas. When encountering large impurities and particles in the sampled gas, a servo motor adjusts the height of the regulating block to expand the unfolded area of ​​the fan-shaped baffle, further enhancing the filtration and blocking of the sampled gas. This allows for sampling different gases with varying degrees of fan-shaped baffle area expansion.

[0030] See Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 8 and Figure 9The fixed cylinder 42 is equipped with a brush cleaning assembly, which is used to clean the blocking brush 51 and the blockage impurities at the bottom of the filter screen 57. The brush cleaning assembly includes a servo motor 43 fixedly installed at the bottom of the fixed cylinder 42. A screw 44 is fixedly installed at the output end of the servo motor 43. An adjusting block 45 is threaded through the screw 44. A hinge rod 47 is movably connected between the adjusting block 45 and the fan-shaped blocking plate 50 through a hinge. The fixed cylinder 42 has an adjusting groove 46 that matches the size of the hinge rod 47, and the hinge rod 47 moves through the adjusting groove 46. An inclined arc-shaped scraper 56 is provided around the bottom of the connecting pipe 11. The arc-shaped scraper 56 scrapes and cleans the blocking brush 51. When the blocking brush 51 and the arc-shaped scraper 56 scrape alternately, the particulate impurities on the blocking brush 51 are stably and effectively displaced, and the blocking brush 51 is thoroughly cleaned, improving the cleaning effect on the sampled gas.

[0031] See Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 8 and Figure 9 An L-shaped adjusting rod 55 is fixedly installed on the top of the adjusting block 45, and the top of the L-shaped adjusting rod 55 extends through to the outer side of the top of the fixed cylinder 42. The cleaning plate 53 is fixedly installed at the top of the L-shaped adjusting rod 55, and there are three sets of cleaning plates 53. The cleaning brush 54 moves against the bottom of the filter screen plate 57. The bottom of the sampling base frame 10 is connected to the air inlet pipe 19, which is connected to the bottom of the connecting pipe 11. The outer periphery of the air inlet pipe 19 is wrapped with a heating ring 60. The heating ring 60 effectively ensures that the sampling gas will not condense and adsorb the sampling and detection components of the gas. The connecting pipe 11 is located at the inner bottom of the sampling base frame 10.

[0032] See Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 8 and Figure 9During sampling intervals or after sampling is completed, the servo motor 43 drives the screw 44 to rotate, causing the adjusting block 45 on the screw 44 to rise. The hinge rod 47 simultaneously opens the three sets of fan-shaped baffles 50, and the L-shaped adjusting rod 55 lifts the three sets of cleaning brushes 54 to make close contact with the bottom of the filter screen 57. At this time, the drive motor 40 is started to rotate, and the opened fan-shaped baffles 50 fit into the arc-shaped scraper 56. The arc-shaped scraper 56 brushes the blocking brushes 51 on the fan-shaped baffles 50 to clean them, while the rotating cleaning brushes 54 brush the bottom of the filter screen 57. The cleaning brushes 54 and blocking brushes 51 are thoroughly cleaned. After cleaning is completed, the servo motor 43 reverses, and all components are reset.

[0033] A sampling method for a stationary pollution source gaseous pollutant sampling device includes the following steps: S1. Install the air inlet pipe 19 at the sampling point of the fixed pollution source, start the heating ring 60 inside the sampling base frame 10 to preheat the air inlet pipe 19 and the connecting pipe 11, prevent water vapor in the flue gas from condensing in the pipeline, thereby adsorbing the target pollutants and ensuring that the collected samples are real gaseous samples. S2. Turn on the negative pressure fan 17 and the exhaust fan 18 to form a stable negative pressure in the sampling tube 12 and the connecting pipe 11. Under the action of negative pressure, the gas to be tested is drawn in through the air inlet pipe 19 and enters the sampling tube 12 through the connecting pipe 11. The sampling head 13 discharges the sampling gas into the detection tube through the negative pressure fan 17 in conjunction with the telescopic conduit 16 and the first conduit 15. The gas passes through the filter blocking assembly. The fan-shaped baffle plate 50, together with the blocking brush 51 and the blocking holes 52, blocks the impurities contained in the gas. Then it passes through the filter screen plate 57 for final fine filtration. S3, the rotary motor 23 drives the drive gear 24 to move, which drives the rotating gear disk 25 meshing with it to rotate in the annular groove 21 of the annular base plate 20. The limiting base 26 fixed on the rotating gear disk 25 rotates synchronously, driving the sampling head 13 to make a circular motion in the sampling cylinder 12. The arc-shaped actuating rod 28 installed at the bottom of the limiting sliding plate 27 generates a regular axial reciprocating motion under the constraint of the S-shaped actuating groove 29 of the annular base plate 20. It is transmitted to the sampling head 13 through the connecting ring 14 and the first conduit 15. The sampling head 13 realizes the revolution around the inner wall of the sampling cylinder 12 and the reciprocating insertion along the cylinder diameter direction. The sampling head 13 covers the three-dimensional spiral sampling trajectory of the entire cross-section of the sampling cylinder 12. S4. During the sampling process, the turbulence fan assembly is activated, and the electric telescopic rod 33 is controlled to reciprocate and extend, thereby driving the T-shaped connecting block 36 and the fixed rack 37 to move horizontally. The fixed rack 37 drives the fixed gear disk 32 that meshes with it to rotate reciprocally, thereby driving the arc-shaped fan rod 34 and the arc-shaped fan plate 30 at its bottom to fan at the top inside the sampling tube 12. The vortex generated by the arc-shaped fan plate 30 strongly agitates the rising gas, destroying any possible gas stratification or concentration gradient, so that the gas around the sampling head 13 is always in a highly homogeneous state, further ensuring the consistency of the gas composition inhaled from the sampling head 13 each time. S5. During sampling intervals or standby, the servo motor 43 in the brush cleaning assembly is activated. The servo motor 43 drives the screw 44 to rotate, causing the adjusting block 45 to rise inside the fixed cylinder 42. The adjusting block 45 controls the three sets of fan-shaped baffles 50 to open synchronously via the hinge rod 47. At the same time, the cleaning plate 53 moves synchronously upward via the L-shaped adjusting rod 55. The cleaning brush 54 abuts against the filter screen 57. The drive motor 40, in conjunction with the connecting rod 41, drives the fixed cylinder 42 and the fan-shaped baffles 50 to rotate. During rotation, the arc-shaped scraper 56 scrapes and removes impurities adhering to the baffle brush 51. Simultaneously, the cleaning brush 54 brushes and cleans the bottom of the filter screen 57. After the rotation and brushing, the fan-shaped baffles 50 and the cleaning brush 54 return to their original positions. Working principle: The air inlet pipe 19 is installed at the sampling point of the fixed pollution source. The heating ring 60 inside the sampling base frame 10 is activated to preheat the air inlet pipe 19 and the connecting pipe 11, which effectively prevents water vapor in the flue gas from condensing in the pipeline, thereby adsorbing the target pollutants and ensuring that the collected samples are real gaseous samples. Then, the exhaust fan 18 at the top of the sampling tube 12 is turned on. The exhaust fan 18 will create a negative pressure inside the connecting pipe 11 and the sampling tube 12. In this way, the gaseous pollutants from the fixed pollution source will enter the connecting pipe 11 and the sampling tube 12 through the air inlet pipe 19. Then, the negative pressure fan 17 is turned on. The sampling head 13, through the negative pressure fan 17, in conjunction with the telescopic conduit 16 and the first conduit 15, draws the sampling gas inside the sampling cylinder 12 into the detection tube. Before the gas is sampled, it passes through the filter blocking assembly to block and filter gas impurities and particles. Specifically, the blocking brush 51 and blocking holes 52 of the fan-shaped blocking plate 50 block impurities and particles in the sampling gas, effectively preventing impurities and particles in the sampling gas from entering the sampling cylinder 12, improving the detection accuracy of the sampling head 13, and at the same time providing a good protection effect for the sampling head 13. The initially filtered and blocked sampling gas then passes through the filter screen plate 57 for fine filtration, improving the cleanliness and purity of the sampling gas. During sampling, the rotary motor 23 drives the drive gear 24 of the sampling cylinder 12 to rotate. The drive gear 24 meshes with the outer edge teeth of the rotating gear disk 25. The rotating gear disk 25 slides through the annular slider 22 at its bottom and the annular groove 21 at the top of the annular base plate 20. The rotating gear disk 25 will undergo stable and smooth revolution inside the sampling cylinder 12. The limiting base 26 is fixed to the top of the rotating gear disk 25. The limiting sliding plate 27 is slidably installed inside the limiting base 26. The upper end of the arc-shaped actuating rod 28 is fixed to the bottom of the limiting sliding plate 27, and the lower end is embedded and slidably connected in the S-shaped actuating groove 29. The sampling head 13 is connected to the arc-shaped actuating rod 28 through the first guide tube 15 and the connecting ring 14. The top of the shaped actuating lever 28 is movably connected. During operation, the rotary motor 23 drives the drive gear 24 to rotate, which in turn meshes with and drives the rotating gear disk 25 to rotate. At the same time, the S-shaped actuating groove 29 forces the arc-shaped actuating lever 28 to drive the limiting sliding plate 27 and the sampling head 13 to perform axial reciprocating motion, ultimately synthesizing a three-dimensional spiral sampling trajectory. That is, within one revolution cycle of the rotating gear disk 25, the motion trajectory of the sampling head 13 is a three-dimensional spiral line wrapped inside the sampling cylinder 12. It can sample close to the cylinder wall and also penetrate to the central area for sampling, realizing sampling of the entire cross-section of the sampling cylinder 12 without dead angles, expanding the sampling area and improving the sampling accuracy.

[0034] During the circumferential sampling process of the sampling head 13, the telescopic end of the electric telescopic rod 33 on the baffle frame 31 drives the T-shaped connecting block 36 to move stably horizontally in the limiting groove 35. The bottom of the T-shaped connecting block 36 drives the fixed rack 37 to move stably horizontally through the limiting groove 35. The fixed rack 32 is movably connected to the bottom of the baffle frame 31 through a rotating shaft and is engaged with the fixed rack 37. When the electric telescopic rod 33 reciprocates, it pushes the T-shaped connecting block 36 and the fixed rack 37 to move horizontally and reciprocally in a linear motion. The fixed rack 37 drives the fixed rack 32, which is engaged with it, to rotate reciprocally. The rotation of the fixed rack 32 is transmitted to the arc-shaped fan plate 30, which is uniformly installed on it, through the arc-shaped fan rod 34, so that it swings in a fan shape in the vertical plane, agitates the gas, generates a controllable vortex in the upper part of the sampling cylinder 12, actively breaks the gas stratification, realizes rapid homogenization of the sampled gas, and ensures the uniformity and representativeness of the gas composition at the moment of each sampling.

[0035] During sampling intervals or after sampling is completed, the servo motor 43 drives the screw 44 to rotate, causing the adjusting block 45 on the screw 44 to rise. The hinge rod 47 simultaneously opens the three sets of fan-shaped baffles 50, and the L-shaped adjusting rod 55 lifts the three sets of cleaning brushes 54 to make close contact with the bottom of the filter screen 57. At this time, the drive motor 40 is started to rotate, and the opened fan-shaped baffles 50 fit into the arc-shaped scraper 56. The arc-shaped scraper 56 brushes the blocking brushes 51 on the fan-shaped baffles 50 to clean them, while the rotating cleaning brushes 54 brush the bottom of the filter screen 57. The cleaning brushes 54 and blocking brushes 51 are thoroughly cleaned. After cleaning is completed, the servo motor 43 reverses, and all components are reset.

[0036] In addition, when encountering large impurities and particles in the sampled gas, the servo motor is used to adjust the height of the regulating block, thereby expanding the unfolded area of ​​the fan-shaped baffle and improving the blocking and filtration of the sampled gas. This allows for sampling of different gases and different degrees of unfolding of the fan-shaped baffle area.

[0037] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A sampling device for gaseous pollutants from a fixed pollution source, comprising a sampling base frame (10), a connecting pipe (11) disposed inside the sampling base frame (10), and a sampling cylinder (12) disposed on the top of the sampling base frame (10), the sampling cylinder (12) being connected through to the top end of the connecting pipe (11), characterized in that, A sampling head (13) is movably disposed at the bottom of the sampling tube (12). A circumferential toggle assembly is disposed inside the sampling tube (12). The circumferential toggle assembly is used to drive the sampling head (13) to perform circumferential motion and reciprocating toggle inside the sampling tube (12). The surrounding actuation assembly includes an annular base plate (20), a drive gear (24), and a limiting base (26). An S-shaped actuation groove (29) is provided on the inner side of the annular base plate (20). When the drive gear (24) drives the sampling head (13) to rotate, the sampling head (13) moves axially back and forth along the limiting base (26) under the constraint and guidance of the S-shaped actuation groove (29). A turbulence fan assembly is provided at the top inner part of the sampling tube (12). The turbulence fan assembly is used to fan the sampling gas around the sampling head (13) and to turbulently disperse the sampling gas inside the sampling tube (12). The arc-shaped fan plate (30) provided in the turbulence fan assembly moves at the top inner part of the sampling tube (12). A filter screen plate (57) is fixedly installed at the bottom of the inner side of the connecting pipe (11). A filter blocking assembly is provided at the bottom of the inner side of the connecting pipe (11). The filter blocking assembly is used to filter and block impurities in the gas entering the sampling tube (12). The filter blocking assembly includes a fixed tube (42), a blocking brush (51), and a cleaning brush (54). The fixed cylinder (42) is equipped with a brush cleaning component, which is used to brush and clean the blocking brush (51) and clean the blockage impurities at the bottom of the filter screen (57).

2. The stationary pollution source gaseous pollutant sampling device according to claim 1, characterized in that, The surrounding actuation assembly also includes a rotary motor (23) installed at the bottom of the outer side of the sampling tube (12). An annular groove (21) is provided on the top of the annular base plate (20). An annular slider (22) is slidably connected in the annular groove (21). A rotating gear (25) is fixedly installed between the tops of the annular slider (22). A drive gear (24) is fixedly installed on the output end of the rotary motor (23). The drive gear (24) and the rotating gear (25) are in active meshing.

3. The stationary pollution source gaseous pollutant sampling device according to claim 2, characterized in that, The top of the rotating gear disk (25) is equipped with a limiting base (26), and a limiting sliding plate (27) is slidably connected inside the limiting base (26). An arc-shaped toggle rod (28) is fixedly installed at the bottom of the limiting sliding plate (27). The size of the arc-shaped lever (28) matches the S-shaped lever groove (29), and the arc-shaped lever (28) moves in the S-shaped lever groove (29). A connecting ring (14) is fixedly installed at the end of the arc-shaped lever (28) away from the limiting base (26). A first conduit (15) is movably connected inside the connecting ring (14), and the sampling head (13) is installed at the bottom of the first conduit (15). A negative pressure fan (17) is connected to the top of the first conduit (15) through a telescopic conduit (16), and the negative pressure fan (17) is located outside the sampling tube (12).

4. A stationary pollution source gaseous pollutant sampling device according to claim 3, characterized in that, A fan (18) is fixedly installed on the top side of the sampling tube (12). The fan (18) absorbs and discharges the gas in the sampling tube (12) and the connecting pipe (11), and generates negative pressure inside the sampling tube (12) and the connecting pipe (11). The turbulence fan assembly also includes a fixed rack (37) and a fixed toothed disc (32). A baffle (31) is fixedly installed on the top of the sampling tube (12). The baffle (31) is movably connected to a fixed gear plate (32) via a rotating shaft. An electric telescopic rod (33) is fixedly installed on the top of the baffle (31) via bolts.

5. A stationary pollution source gaseous pollutant sampling device according to claim 4, characterized in that, The fixed toothed disc (32) has an arc-shaped fan rod (34) fixedly installed on the side away from the spoiler frame (31), and the arc-shaped fan plate (30) is evenly installed at the bottom of the arc-shaped fan rod (34). The spoiler frame (31) has a limit groove (35), and a T-shaped connecting block (36) is slidably connected in the limit groove (35). The bottom of the T-shaped connecting block (36) is fixedly installed with a fixed rack (37) through the spoiler frame (31), and the fixed rack (32) is movably engaged with both sides of the fixed rack (37). The top of the T-shaped connecting block (36) is fixedly installed on the electric telescopic rod (33).

6. A stationary pollution source gaseous pollutant sampling device according to claim 5, characterized in that, A drive motor (40) is fixedly installed at the bottom of the sampling base frame (10), a connecting rod (41) is fixedly installed at the output end of the drive motor (40), and a fixed cylinder (42) is fixedly installed at the top of the connecting rod (41). The filter blocking assembly also includes a fan-shaped blocking plate (50), with several blocking brushes (51) evenly installed on the outer periphery of the fan-shaped blocking plate (50). Connecting rods (48) are installed around the bottom of the fixed cylinder (42). The bottom of the fan-shaped blocking plate (50) is movably connected to the connecting rods (48), and there are three sets of fan-shaped blocking plates (50). A cleaning plate (53) is movably installed on the outer side of the top of the fixed cylinder (42), and cleaning brushes (54) are evenly installed on the top of the cleaning plate (53). Several blocking holes (52) are evenly opened on the fan-shaped blocking plate (50).

7. A stationary pollution source gaseous pollutant sampling device according to claim 6, characterized in that, The brush cleaning assembly includes a servo motor (43) fixedly installed at the bottom of the fixed cylinder (42), a screw (44) fixedly installed at the output end of the servo motor (43), an adjusting block (45) threaded through the screw (44), a hinge rod (47) movably connected between the adjusting block (45) and the fan-shaped baffle (50) through a hinge, and an adjusting groove (46) matching the size of the hinge rod (47) is opened in the fixed cylinder (42), and the hinge rod (47) movably passes through the adjusting groove (46); An inclined arc-shaped scraper (56) is provided around the inner bottom of the connecting pipe (11), and the arc-shaped scraper (56) scrapes and cleans the blocking brush (51).

8. A stationary pollution source gaseous pollutant sampling device according to claim 7, characterized in that, An L-shaped adjusting rod (55) is fixedly installed on the top of the adjusting block (45), and the top of the L-shaped adjusting rod (55) extends through to the outer side of the top of the fixed cylinder (42). The cleaning plate (53) is fixedly installed at the top of the L-shaped adjusting rod (55), and there are three sets of cleaning plates (53). The cleaning brush (54) moves against the bottom of the filter screen plate (57). An air inlet pipe (19) is connected through the bottom of the sampling base frame (10). The air inlet pipe (19) is connected through the bottom of the connecting pipe (11). The outer periphery of the air inlet pipe (19) is wrapped with a heating ring (60), and the connecting pipe (11) is located at the inner bottom of the sampling base frame (10).

9. The sampling method of a stationary pollution source gaseous pollutant sampling device according to claim 8, characterized in that, It includes the following steps: S1. Install the air inlet pipe (19) at the sampling point of the fixed pollution source, and start the heating ring (60) inside the sampling base frame (10) to preheat the air inlet pipe (19) and the connecting pipe (11); S2. Turn on the negative pressure fan (17) and the exhaust fan (18) to form a stable negative pressure in the sampling tube (12) and the connecting pipe (11). Under the action of negative pressure, the gas to be tested is drawn in through the air inlet pipe (19) and enters the sampling tube (12) through the connecting pipe (11). The sampling head (13) discharges the sampling gas into the detection tube through the negative pressure fan (17) in conjunction with the telescopic conduit (16) and the first conduit (15). The gas passes through the filter blocking assembly. The fan-shaped blocking plate (50) in conjunction with the blocking brush (51) and the blocking hole (52) blocks the impurities contained in the gas. Then it passes through the filter screen plate (57) for final fine filtration. S3. The rotary motor (23) drives the drive gear (24) to move, which drives the rotating gear disk (25) meshing with it to rotate in the annular groove (21) of the annular base plate (20). The limiting base (26) fixed on the rotating gear disk (25) rotates synchronously, driving the sampling head (13) to make a circular motion in the sampling tube (12). The arc-shaped actuating rod (28) installed at the bottom of the limiting sliding plate (27) generates a regular axial reciprocating motion under the constraint of the S-shaped actuating groove (29) of the annular base plate (20). It is transmitted to the sampling head (13) through the connecting ring (14) and the first conduit (15). The sampling head (13) realizes the revolution around the inner wall of the sampling tube (12) and the reciprocating insertion along the tube diameter direction. The sampling head (13) covers the three-dimensional spiral sampling trajectory of the entire cross section of the sampling tube (12). S4. During the sampling process, the turbulence fan assembly is activated, and the electric telescopic rod (33) is controlled to perform reciprocating telescopic motion, which in turn drives the T-shaped connecting block (36) and the fixed rack (37) to move horizontally. The fixed rack (37) drives the fixed gear plate (32) that meshes with it to rotate reciprocally, thereby driving the arc-shaped fan rod (34) and its bottom arc-shaped fan plate (30) to fan at the top inside the sampling tube (12). S5. When sampling intervals or standby, start the servo motor (43) in the brush cleaning assembly. The servo motor (43) drives the screw (44) to rotate, which drives the adjusting block (45) to rise inside the fixed cylinder (42). The adjusting block (45) controls the three sets of fan-shaped baffles (50) to open synchronously through the hinge rod (47). At the same time, the cleaning plate (53) moves synchronously upward through the L-shaped adjusting rod (55). The cleaning brush (54) and the filter screen (57) come into contact. The drive motor (40) and the connecting rod (41) drive the fixed cylinder (42) and the fan-shaped baffles (50) to rotate. During the rotation, the arc scraper (56) scrapes and removes the impurities adhering to the baffle brush (51). At the same time, the cleaning brush (54) brushes and cleans the bottom of the filter screen (57). After the rotation and brushing, the fan-shaped baffles (50) and the cleaning brush (54) are reset.

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