Pollutant digital probe detector

Abstract

The invention relates to the field of pollution detection, in particular to a pollutant digital probe detector. The pollutant digital probe detector comprises a fixed cylinder, a cover body is detachably connected to the fixed cylinder, and a mounting rod is fixedly connected in the fixed cylinder; the air storage cylinders are arranged, the mounting rod is provided with mounting grooves corresponding to the air storage cylinders, and each mounting groove corresponds to one air storage cylinder; and an air exhaust assembly and the like. When the VOC concentration is detected, a particulate matter concentration sensor is arranged in a gas storage cylinder, the particulate matter concentration in sample gas is synchronously detected through a light scattering method, particulate matter concentration detection is achieved while particulate matter is filtered, the comprehensiveness of detection parameters is improved, the running state of the activated carbon adsorption bed can be comprehensively evaluated, and the VOC concentration can be accurately detected through step-by-step filtering. Particulate matters entering the sensor along with sample gas are reduced, the pollution risk of the sensor is remarkably reduced, and the long-term precision and stability of online continuous detection of the VOC concentration sensor are ensured.

Description

Technical Field

[0001] This invention relates to the field of pollution detection, and more particularly to digital probe detectors for pollutants. Background Technology

[0002] Volatile organic compounds (VOCs) are important precursors to fine particulate matter (PM2.5) and ozone, posing a serious threat to the atmospheric environment and human health. Activated carbon adsorption beds are widely used for VOC treatment in industrial waste gas due to their advantages such as high adsorption efficiency, low energy consumption, and easy regeneration. However, in actual operation, the outlet monitoring of activated carbon adsorption beds faces the following technical problems: existing VOC concentration monitoring sensors lack the ability to monitor the concentration of particulate matter in waste gas. However, after long-term operation, activated carbon adsorption beds may experience pulverization and escape of activated carbon particles due to airflow erosion, or dust may be introduced due to front-end filter failure. The presence of particulate matter not only constitutes pollution itself, but also adheres to the optical window or electrode surface of VOC sensors, leading to decreased detection accuracy or even equipment failure. At the same time, monitoring a single parameter is difficult to comprehensively assess the operating status of the treatment facility. Summary of the Invention

[0003] To overcome the shortcomings of existing VOC concentration monitoring sensors, such as the lack of ability to monitor particulate matter concentration in exhaust gas and the tendency of particulate matter to cause a decrease in detection accuracy or even equipment failure, this invention provides a pollutant digital probe detector.

[0004] Technical solution: A digital probe detector for pollutants, comprising: a fixed cylinder with a detachably connected cover, wherein a mounting rod is fixedly connected inside the fixed cylinder; several gas storage cylinders, wherein the mounting rod has mounting slots corresponding to the several gas storage cylinders, each mounting slot corresponding to one gas storage cylinder; several extraction components for extracting sample gas in conjunction with the gas storage cylinders, each extraction component corresponding to one gas storage cylinder; a gas path system connected to all extraction components is provided inside the fixed cylinder; a VOC concentration sensor connected to the gas path system is provided on the cover; and several self-cleaning filter components, all connected to the gas path system and installed in the mounting slots corresponding to the mounting rods, each self-cleaning filter component corresponding to one gas storage cylinder.

[0005] Further explanation: The air circuit system includes a backflush pipe fixed to the mounting rod, several telescopic hoses communicating with the backflush pipe, an air guide pipe communicating with the backflush pipe, an air collection pipe communicating with the air guide pipe, and an external pipe communicating with the air collection pipe; wherein, each of the telescopic hoses is connected to one of the self-cleaning filter components, the air collection pipe is connected to all the air extraction components, the external pipe penetrates the cover, a second control valve and a first control valve are respectively provided at the upper and lower parts of the air guide pipe, and a third control valve is provided on the air collection pipe.

[0006] Further explanation: the air extraction assembly includes: a piston component connected to the air storage cylinder, the piston component including a first piston slidably connected to the air storage cylinder, a second piston slidably connected to the air storage cylinder, a connecting pipe fixedly connected to the first piston, and two suction pipes slidably connected to the first piston; a lifting component disposed within the fixed cylinder, the lifting component including two third lifting units connected to the fixed cylinder, a mounting plate connected to the two third lifting units, the mounting plate being fixedly connected to the two suction pipes and two first lifting units connected to the mounting rod, both of the two first lifting units being connected to the air storage cylinder; two electrically operated lifting sliders respectively connected to the two first lifting units, the two electrically operated lifting sliders sharing a connecting plate fixedly connected to the connecting pipe; and an air supply pipe slidably connected to the connecting pipe and communicating with the air collection pipe.

[0007] Further, the air extraction assembly also includes two second lifting units connected to the mounting rod, two fixing plates respectively fixed to the two second lifting units, and a magnetic ring fixed to the two fixing plates; wherein, the magnetic ring corresponds to the position of the second piston, and the second piston is made of magnetic material, attracting the magnetic ring, and the magnetic attraction between the two is greater than the frictional force between the second piston and the air storage cylinder; both suction pipes are slidably connected to the second piston, and a second filter is provided in the groove corresponding to the second piston and the two suction pipes.

[0008] To further explain, the first lifting unit, the second lifting unit, and the third lifting unit are all composed of electric slide rails and electric sliders. By controlling the electric slider to move on the electric slide rails, the corresponding components are lifted and lowered.

[0009] Further explanation: The self-cleaning filter assembly includes: an air vent plate fixedly connected to the air storage cylinder, with a mounting column rotatably connected to the lower side of the air vent plate; four filter elements arranged in a ring array, all disposed within the mounting column; an electric rotating ring disposed within the mounting rod, the rotating part of the electric rotating ring slidably connected to the mounting column, and the outer ring surface of the mounting column having a protrusion, and the inner ring surface of the rotating part of the electric rotating ring having a groove matching the protrusion; and a dust collection unit disposed on the mounting plate and connected to the two dust collection pipes; wherein, the air vent plate has a three-way groove communicating with the telescopic flexible hose, and the air vent plate has air holes, each initially corresponding to one of the filter elements.

[0010] To further explain, the filter element includes a filter tube fixedly connected to the mounting column, a switch valve connected to the filter tube, two first filter plates disposed inside the filter tube, and a plurality of ribbons fixedly connected to the two first filter plates; wherein, the two first filter plates are respectively disposed at the upper and lower parts of the filter tube, and the pore size of the lower first filter plate is larger than that of the upper first filter plate.

[0011] To further explain, the vacuuming unit includes a vacuum cleaner connected to the mounting plate and a three-way pipe connected to the vacuum cleaner's suction port, with the other two ports of the three-way pipe respectively connected to the two suction pipes.

[0012] To further explain, it also includes a particulate matter concentration sensor disposed inside the gas storage tank. The particulate matter concentration sensor includes a sensor transmitter disposed on the lower side of the second piston and a sensor receiver disposed on the upper side of the ventilation plate.

[0013] To further explain, each slot of the three-way groove is connected to a jet pipe, and each jet pipe is provided with a nozzle facing the sensor receiving end. The ventilation plate has several openings that are flush with the upper side of the sensor receiving end.

[0014] The beneficial effects of this invention are as follows: 1. While detecting VOC concentration, a particulate matter concentration sensor is installed in the gas storage tank. The particulate matter concentration in the sample gas is detected simultaneously by light scattering method. The particulate matter concentration is detected while filtering particulate matter, which increases the comprehensiveness of the detection parameters and helps to comprehensively evaluate the operating status of the activated carbon adsorption bed. Through step-by-step filtration, the particulate matter entering the sensor with the sample gas is reduced, which significantly reduces the risk of sensor contamination and ensures the long-term accuracy and stability of the VOC concentration sensor for continuous online detection.

[0015] 2. The self-cleaning filter assembly uses four filter elements arranged in a ring array. The mounting column is driven to rotate by an electric rotating ring, which can realize the online switching of different filter elements and avoid the impact of residual sample gas on the next test due to a single filter element.

[0016] 3. By setting up multiple extraction components, each extraction component can independently adjust its sampling depth in the exhaust pipe through the first lifting unit, enabling the collection of sample gas from different spatial locations at the same time. During testing, any one or more extraction components can be selected to work. By controlling the solenoid valve on the corresponding gas delivery pipe, sample gas from multiple locations can be mixed for unified testing, or tested one by one to analyze the concentration differences at different locations. This achieves a flexible multi-point sampling and testing method, which helps to accurately determine the adsorption uniformity of the activated carbon adsorption bed and whether there are problems such as local penetration, providing more detailed data support for process optimization and fault diagnosis. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is an enlarged view of area A of the present invention; Figure 4 This is a schematic diagram of the combined structure of the venting disc, mounting column, and filter tube of the present invention; Figure 5 This is an enlarged view of region E of the present invention; Figure 6 This is a schematic diagram of the combined structure of the filter tube, the first filter element, and the ribbon of the present invention; Figure 7 This is a cross-sectional view of the venting disc of the present invention; Figure 8 This is an enlarged view of region B of the present invention; Figure 9 This is a schematic diagram of the assembly of the first piston and the second piston of the present invention; Figure 10 This is an enlarged view of region C of the present invention; Figure 11 This is an enlarged view of region D of the present invention.

[0018] The markings in the attached diagram are: 1-Fixed cylinder, 2-Cover, 3-Mounting rod, 4-Air storage cylinder, 5-Ventilation disc, 501-Sensor receiver, 502-T-slot, 503-Jet pipe, 504-Guide groove, 505-Ventilation hole, 6-Mounting column, 7-Electric rotating ring, 8-Filter pipe, 801-Switch valve, 802-First filter plate, 803-Ribbon, 9-Backflush pipe, 10-Telescopic hose, 11-First lifting unit, 12-Second lifting unit, 13-Fixed plate, 14-Magnetic ring, 15- First piston, 1501-Second piston, 15011-Second filter, 15012-Sensor transmitter, 16-Suction pipe, 17-Connecting pipe, 18-Gas supply pipe, 19-Gas guide pipe, 1901-First control valve, 1902-Second control valve, 20-Gas collection pipe, 2001-Third control valve, 21-External pipe, 22-VOC concentration sensor, 23-Third lifting unit, 24-Electric lifting slider, 25-Connecting plate, 26-Mounting plate, 27-Vacuum cleaner, 28-T-connector. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0020] according to Figures 1-11As shown, this embodiment provides a digital probe detector for pollutants, including a fixed cylinder 1, a gas storage cylinder 4, an extraction assembly, and a self-cleaning filter assembly. The fixed cylinder 1 has a detachably connected cover 2, and an installation rod 3 is fixedly connected inside the fixed cylinder 1. Several gas storage cylinders 4 are provided, and each installation rod 3 has an installation groove corresponding to one gas storage cylinder 4. Several extraction assemblies are provided to cooperate with the gas storage cylinders 4 in extracting sample gas, and each extraction assembly corresponds to one gas storage cylinder 4. A gas path system connected to all extraction assemblies is provided inside the fixed cylinder 1, and a VOC concentration sensor 22 connected to the gas path system is provided on the cover 2. Several self-cleaning filter assemblies are provided, all connected to the gas path system and installed in the installation grooves corresponding to the installation rods 3, with each self-cleaning filter assembly corresponding to one gas storage cylinder 4. The sample gas is extracted by working with the gas storage tank 4, and most of the particulate matter in the sample gas is intercepted and filtered by the self-cleaning filter component. The sample gas is then delivered to the VOC concentration sensor 22 for detection through the gas path system.

[0021] The gas path system includes a backflush pipe 9 fixed to the mounting rod 3, several telescopic hoses 10 connected to the backflush pipe 9, a guide pipe 19 connected to the backflush pipe 9, a gas collecting pipe 20 connected to the guide pipe 19 and the VOC concentration sensor 22, and an external connecting pipe 21 connected to the gas collecting pipe 20. Each telescopic hose 10 is connected to one of the self-cleaning filter components. The gas collecting pipe 20 is connected to all the extraction components. The external connecting pipe 21 penetrates the cover 2. A second control valve 1902 and a first control valve 1901 are respectively installed at the upper and lower parts of the guide pipe 19. A third control valve 2001 is installed on the gas collecting pipe 20. Sample gas from multiple extraction components is input into the VOC concentration sensor 22 through the gas collecting pipe 20. The backflush pipe 9 cleans the self-cleaning filter components by backflushing gas through the telescopic hoses 10.

[0022] The air extraction assembly includes a piston component, a lifting component, an electric lifting slider 24, and an air supply pipe 18. The piston component is connected to the air storage cylinder 4 and includes a first piston 15 slidably connected to the air storage cylinder 4, a second piston 1501 slidably connected to the air storage cylinder 4, a connecting pipe 17 fixedly connected to the first piston 15, and two suction pipes 16 slidably connected to the first piston 15. The lifting component is disposed within the fixed cylinder 1 and includes two third lifting units 23 connected to the fixed cylinder 1, and a connecting pipe 17 fixedly connected to the two third lifting units. The mounting plate 26 is connected to the two suction pipes 16 and the mounting rod 3. Two first lifting units 11 are connected to the air storage cylinder 4. Two electric lifting sliders 24 are respectively connected to the two first lifting units 11. A connecting plate 25, which is fixed to the connecting pipe 17, is fixed between the two electric lifting sliders 24. An air supply pipe 18 is slidably connected to the connecting pipe 17 and communicates with the air collection pipe 20. The end of the connecting pipe 17 extends upward to the upper part of the air supply pipe 18. Air is drawn by the synchronous movement of the first piston 15 and the second piston 1501. The first lifting unit 11, the second lifting unit 12, and the third lifting unit 23 drive the corresponding components to move up and down.

[0023] Each of the gas delivery pipes 18 is equipped with a solenoid valve. By controlling the opening of the solenoid valves of different gas delivery pipes 18 of the extraction components, the sample gas input into the VOC concentration sensor 22 is controlled.

[0024] The suction assembly further includes two second lifting units 12 connected to the mounting rod 3, two fixing plates 13 respectively fixed to the two second lifting units 12, and a magnetic ring 14 fixed to the two fixing plates 13. The magnetic ring 14 corresponds to the position of the second piston 1501, and the second piston 1501 is made of magnetic material, attracting the magnetic ring 14 with a magnetic force greater than the frictional force between the second piston 1501 and the air storage cylinder 4. Both suction pipes 16 are slidably connected to the second piston 1501, and a second filter 15011 is provided in the corresponding groove of the second piston 1501 and the two suction pipes 16. The magnetic force of the magnetic ring 14 drives the second piston 1501 to move up and down within the air storage cylinder 4, filtering the sample gas again through the second filter 15011 to intercept particulate matter and reduce the particulate matter entering the VOC concentration sensor 22.

[0025] The first lifting unit 11, the second lifting unit 12 and the third lifting unit 23 are all composed of electric slide rails and electric sliders. By controlling the electric slider to move on the electric slide rail, the corresponding components are lifted and lowered.

[0026] The self-cleaning filter assembly includes an air vent plate 5, filter elements, an electric rotating ring 7, and a vacuuming unit. The air vent plate 5 is fixedly connected to the air reservoir 4, and a mounting post 6 is rotatably connected to the lower side of the air vent plate 5. Four filter elements are arranged in a ring array, all housed within the mounting post 6. The electric rotating ring 7 is housed within the mounting rod 3, with its rotating part slidably connected to the mounting post 6. The outer ring surface of the mounting post 6 has a raised strip, and the inner ring surface of the rotating part of the electric rotating ring 7 has a groove matching the raised strip. The vacuuming unit is mounted on the mounting plate 26 and connected to two vacuuming pipes 16. The air vent plate 5 has a three-way groove 502 communicating with the telescopic flexible hose 10. The air vent plate 5 has ventilation holes 505, initially corresponding to one of the filter elements. The electric rotating ring 7 drives the mounting column 6 to rotate, thereby switching the filter element. The dust collection unit, in conjunction with the dust collection pipe 16, removes the particles intercepted by the second filter 15011.

[0027] The filter element includes a filter tube 8 fixedly connected to the mounting column 6, a switching valve 801 connected to the filter tube 8, two first filter elements 802 disposed within the filter tube 8, and a plurality of ribbons 803 fixedly connected to the two first filter elements 802. The two first filter elements 802 are respectively disposed at the upper and lower parts of the filter tube 8, with the lower first filter element 802 having a larger pore size than the upper first filter element 802. The sample gas is subjected to dual filtration through the two first filter elements 802 with decreasing pore sizes, reducing the difficulty of subsequent filtration.

[0028] The vacuuming unit includes a vacuum cleaner 27 connected to the mounting plate 26 and a three-way pipe 28 connected to the suction port of the vacuum cleaner 27. The other two ports of the three-way pipe 28 are respectively connected to the two suction pipes 16. The vacuum cleaner 27 and the three-way pipe 28 generate suction in the two suction pipes 16 to collect the intercepted particulate matter.

[0029] The second filter 15011 has a smaller pore size than the first filter 802 at the top of the filter tube 8, and the second filter 15011 is made of an elastic material. This allows the pore size of the second filter 15011 to expand after the suction tube 16 squeezes it, thus facilitating the passage of particles.

[0030] It also includes a particulate matter concentration sensor disposed within the gas storage cylinder 4. The particulate matter concentration sensor includes a sensor transmitter 15012 disposed below the second piston 1501 and a sensor receiver 501 disposed above the ventilation plate 5. The particulate matter concentration of the sample gas within the gas storage cylinder 4 is detected by the particulate matter concentration sensor within the gas storage cylinder 4.

[0031] Each opening of the three-way slot 502 is connected to a jet pipe 503. Each jet pipe 503 is equipped with a nozzle facing the sensor receiving end 501. The venting plate 5 has several guide grooves 504 with openings flush with the upper side of the sensor receiving end 501. The surface of the sensor receiving end 501 is cleaned by air jets through the jet pipes 503, and the gas and cleaned-up particles are guided by the guide grooves 504.

[0032] During installation, a through slot matching the fixed cylinder 1 is made on the exhaust pipe of the volatile organic compound activated carbon adsorption bed. The fixed cylinder 1 is then fixed to the exhaust pipe, with the mounting rod 3 positioned inside the exhaust pipe. During testing, the electric lifting slider 24 is first controlled to move downwards on the electric slide rail of the first lifting unit 11. This, in turn, drives the suction pipe 16 and the first piston 15 downwards via the connecting plate 25. Simultaneously, the second lifting unit 12 drives the magnetic ring 14 downwards synchronously via the fixed plate 13. The magnetic ring 14, through magnetic attraction, drives the second piston 1501 downwards synchronously until the second piston 1501 contacts the ventilation plate 5. Then, the first piston 15 and the second piston 1501 move in opposite directions to reset, reconnecting with the gas storage. The gas cylinder 4, in conjunction with the gas storage cylinder, draws the sample gas into the gas storage cylinder 4. When the sample gas passes through the filter tube 8 corresponding to the vent 505, most of the particulate matter is intercepted and filtered by the two first filter plates 802 inside the filter tube 8. This prevents a large amount of particulate matter from being input into the VOC concentration sensor 22 along with the sample gas, which would affect the detection accuracy of the VOC concentration sensor 22. Then, infrared light is emitted through the sensor transmitter 15012. The particulate matter in the sample gas in the gas storage cylinder 4 will scatter the light in all directions. The scattered light is received by the sensor receiver 501, and then the light signal is converted into an electrical signal. After algorithm correction, the concentration value is output as a specific digital value. This process of filtering particulate matter and detecting the concentration of particulate matter in the sample gas simultaneously increases the detection accuracy. To enhance versatility and adaptability to diverse testing needs, the magnetic ring 14 is controlled to move the second piston 1501 downwards to the end of its stroke. This allows the sample gas to pass through the second filter 15011 and be positioned between the first piston 15 and the second piston 1501. The second filter 15011 further intercepts and filters particulate matter in the sample gas, significantly reducing the amount of particulate matter entering the VOC concentration sensor 22 with the sample gas. This, combined with the VOC concentration sensor 22's built-in filtration system, ensures the accuracy of the VOC concentration sensor 22's online continuous detection. Next, the two suction pipes 16 are controlled to move downwards and insert into the second piston 1501. Then, the second piston 1501 and the two... The suction pipes 16 move upward and reset synchronously. Then, through the cooperation of the second piston 1501 and the two suction pipes 16, the sample gas between the second piston 1501 and the first piston 15 is input into the gas collection pipe 20 through the connecting pipe 17 and the gas supply pipe 18. The nitrogen supply device is connected to the external pipe 21, and nitrogen is supplied into the gas guide pipe 19 through the external pipe 21. At this time, the second control valve 1902 is opened and the first control valve 1901 is closed. Then, the sample gas in the gas collection pipe 20 is brought into the VOC concentration sensor 22 through the nitrogen. The sample gas is then introduced into the VOC concentration sensor 22 for detection. After detection by the VOC concentration sensor 22, the concentration value is output as a specific number.

[0033] Before the next suction cycle, close the switch valve 801 on the filter tube 8 corresponding to the vent 505. Control the suction tube 16 to move downwards, causing the port of the suction tube 16 to squeeze the second filter 15011, expanding the pore size of the second filter 15011. Then, start the vacuum cleaner 27, generating suction at the ports of the two suction tubes 16 through the three-way pipe 28. Simultaneously, nitrogen is supplied to the air guide tube 19 through the external pipe 21. At this time, the second control valve 1902 is closed, and the first control valve 1901 is opened, allowing nitrogen to enter the three-way slot 502 through the telescopic hose 10, and then be sprayed onto the sensor receiver 501 through the nozzle of the jet pipe 503 to clean the particles adhering to the surface of the sensor receiver 501, ensuring the accuracy of the sensor receiver 501. At the same time, fill the air reservoir 4 with nitrogen. Then, control the second piston 1501 to move downwards to contact the vent plate 5, and simultaneously open the third control valve 2001. At this time, the nozzle of the jet pipe 503 sprays nitrogen onto the sensor receiver 501. 01. Surface particles causing impact require cleaning to ensure the normal operation of the sensor transmitter 15012. Simultaneously, particles intercepted by the second filter 15011 and residual particles in the gas storage cylinder 4 pass through the expanded aperture and are collected in the vacuum cleaner 27 via the suction pipe 16. Nitrogen passes through the groove on the second piston 1501 corresponding to the suction pipe 16 and enters the connecting pipe 17. The nitrogen then empties the residual sample gas in the connecting pipe 17, the gas delivery pipe 18, and the gas collection pipe 20, preventing it from affecting the accuracy of the next detection. Before the next evacuation, the electric rotating ring 7 is activated, driving the mounting column 6 to rotate 90 degrees, aligning the next filter pipe 8 with the vent 505. This prevents residual sample gas in the previous filter pipe 8 from affecting the detection. Simultaneously, by opening the switch valve 801 on the used filter pipe 8, the second control valve 1902 closes, and the first control valve 1901 opens. Nitrogen is then delivered into the guide pipe 19 through the external pipe 21 and enters the three-way groove 502 through the telescopic hose 10. Then, the gas is sprayed through the switch valve 801 to the filter tube 8, which in turn backflushs and cleans the two first filter elements 802 inside the filter tube 8. At the same time, residual sample gas and attached particles in the filter tube 8 are discharged. Nitrogen gas blows through the two first filter elements 802 and simultaneously causes the ribbon 803 to swing. The swing of the ribbon 803 drives the first filter elements 802 to vibrate, which improves the backflush cleaning effect and ensures the effect of the next use. It also avoids residual sample gas and attached particles from affecting the next detection, thus facilitating long-term online continuous detection of VOC concentration sensor 22 without frequent maintenance.

[0034] According to actual testing requirements, before gas extraction, the first lifting unit 11 can drive the gas storage cylinder 4 to move downward, so that the ventilation plate 5 drives the mounting column 6 to slide downward in the rotating part of the electric rotating ring 7, thereby adjusting the position of the mounting column 6 in the exhaust pipe. This allows multiple gas extraction components to extract sample gas from different locations at the same time. Before testing, the solenoid valves on the gas supply pipes 18 of any gas extraction component can be opened to mix the sample gas extracted from multiple different locations for unified testing, or the solenoid valves on the gas supply pipes 18 of each gas extraction component can be opened one by one to test the sample gas in each gas extraction component separately. This allows for the testing and comparison of sample gas from different locations at the same time, which facilitates understanding the working status of the activated carbon adsorption bed for volatile organic compounds according to different testing methods.

[0035] It should be understood that the above description is for illustrative purposes only and is not intended to limit the invention. Those skilled in the art will understand that variations of the invention are included within the scope of the claims herein.

Claims

1. A digital probe detector for pollutants, characterized in that, include: A fixed cylinder with a cover detachably connected to it, and an installation rod fixedly connected inside the fixed cylinder; The gas storage cylinder is provided in a plurality of ways, and the mounting rod is provided with mounting grooves corresponding to the plurality of gas storage cylinders, with each mounting groove corresponding to one of the gas storage cylinders; Several extraction assemblies are provided to work with the gas storage cylinders to extract sample gas. Each extraction assembly corresponds to one gas storage cylinder. A gas path system connected to all extraction assemblies is provided inside the fixed cylinder. A VOC concentration sensor connected to the gas path system is provided on the cover. Several self-cleaning filter components are provided, all of which are connected to the air circuit system and are installed in the mounting slots corresponding to the mounting rods. Each self-cleaning filter component corresponds to one of the air storage cylinders.

2. The pollutant digital probe detector according to claim 1, characterized in that, The air circuit system includes a backflush pipe fixed to the mounting rod, a plurality of telescopic hoses connected to the backflush pipe, an air guide pipe connected to the backflush pipe, an air collection pipe connected to the air guide pipe, and an external pipe connected to the air collection pipe. Each of the telescopic hoses is connected to one of the self-cleaning filter components, the air collection pipe is connected to all the air extraction components, the outer pipe penetrates the cover, the upper and lower parts of the air guide pipe are respectively provided with a second control valve and a first control valve, and the air collection pipe is provided with a third control valve.

3. The pollutant digital probe detector according to claim 1, characterized in that, The air extraction assembly includes: A piston assembly is connected to the air storage cylinder. The piston assembly includes a first piston slidably connected to the air storage cylinder, a second piston slidably connected to the air storage cylinder, a connecting pipe fixedly connected to the first piston, and two suction pipes slidably connected to the first piston. A lifting component is disposed inside the fixed cylinder. The lifting component includes two third lifting units connected to the fixed cylinder, a mounting plate connected to the two third lifting units, a mounting plate fixedly connected to the two dust suction pipes, and two first lifting units connected to the mounting rod. Both first lifting units are connected to the air storage cylinder. The electric lifting slider has two components, each connected to one of the two first lifting units. A connecting plate, which is fixedly connected to the connecting pipe, is fixedly connected between the two electric lifting sliders. The gas supply pipe is slidably connected to the connecting pipe and communicates with the gas collecting pipe.

4. The pollutant digital probe detector according to claim 3, characterized in that, The air extraction assembly also includes two second lifting units connected to the mounting rod, two fixing plates fixedly connected to the two second lifting units respectively, and a magnetic ring fixedly connected to the two fixing plates. The magnetic ring is positioned corresponding to the second piston, and the second piston is made of magnetic material, attracting the magnetic ring and the magnetic attraction between them being greater than the frictional force between the second piston and the gas storage cylinder. Both of the suction pipes are slidably connected to the second piston, and a second filter is provided in the groove corresponding to the second piston and the two suction pipes.

5. The pollutant digital probe detector according to claim 3, characterized in that, The first lifting unit, the second lifting unit, and the third lifting unit are all composed of electric slide rails and electric sliders. By controlling the electric slider to move on the electric slide rails, the corresponding components are lifted and lowered.

6. The pollutant digital probe detector according to claim 1, characterized in that, The self-cleaning filter component includes: A venting plate is fixedly connected to the air storage cylinder, and a mounting column is rotatably connected to the lower side of the venting plate; The filter element, in a ring array of four, is housed within the mounting column; An electric rotating ring is disposed within the mounting rod. The rotating part of the electric rotating ring is slidably connected to the mounting post. The outer ring surface of the mounting post is provided with a protruding rib, and the inner ring surface of the rotating part of the electric rotating ring is provided with a groove matching the protruding rib. A vacuuming unit is mounted on the mounting plate and connected to the two vacuuming pipes; The ventilation plate is provided with a three-way groove, which is connected to the telescopic hose. The ventilation plate is provided with ventilation holes, which initially correspond to one of the filter elements.

7. The pollutant digital probe detector according to claim 6, characterized in that, The filter element includes a filter tube fixedly connected to the mounting column, a switch valve connected to the filter tube, two first filter plates disposed inside the filter tube, and a plurality of ribbons fixedly connected to the two first filter plates. The two first filter elements are respectively disposed at the upper and lower parts of the filter tube, and the pore size of the lower first filter element is larger than that of the upper first filter element.

8. The pollutant digital probe detector according to claim 6, characterized in that, The vacuuming unit includes a vacuum cleaner connected to the mounting plate and a three-way pipe connected to the vacuum cleaner's suction port. The other two ports of the three-way pipe are respectively connected to the two suction pipes.

9. The pollutant digital probe detector according to any one of claims 6-8, characterized in that, It also includes a particulate matter concentration sensor disposed inside the gas storage tank, the particulate matter concentration sensor including a sensor transmitter disposed on the lower side of the second piston and a sensor receiver disposed on the upper side of the ventilation plate.

10. The pollutant digital probe detector according to claim 9, characterized in that, Each slot of the three-way groove is connected to a jet pipe, and each jet pipe is provided with a nozzle facing the sensor receiving end. The ventilation plate has several openings that are flush with the upper side of the sensor receiving end.

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