An exhaust gas online monitoring device using multi-channel sampling and its transmission method

Abstract

The present invention discloses an online exhaust gas monitoring device using multi-channel sampling and a transmission method thereof, and relates to the field of exhaust gas monitoring. The online exhaust gas monitoring device using multi-channel sampling comprises a sampling module including a bracket, a sampling assembly, a deflection unit, and a rotation unit. The bracket includes a fixed sleeve and a movable sleeve. The sampling assembly is used to collect gas. The deflection unit is used to drive the sampling assembly to deflect at a vertical angle. The rotation unit is used to drive the sampling assembly to rotate at a horizontal angle. The sampling assembly, deflection unit, rotation unit, and gas analysis module are connected to a processor. The online exhaust gas monitoring device using multi-channel sampling uses a three-step verification and detection mechanism to collect gas from the sampling assembly at its initial position, 45° deflection position, and 90° deflection position. The three-step detection logic eliminates instantaneous interference such as sudden changes in wind direction, and only confirms an alarm after three violations, greatly reducing the false alarm rate.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas monitoring, and in particular to an online waste gas monitoring device using multi-channel sampling and a transmission method thereof. Background Art

[0002] When conducting online exhaust gas monitoring in a large area, a multi-channel VOCs online monitoring system with a sampling module is often used. The multi-channel VOCs online monitoring system is an intelligent environmental monitoring device that integrates gas sampling, analysis, data transmission and monitoring. It is mainly used for real-time and continuous monitoring of the concentration of volatile organic compounds (VOCs) in the air.

[0003] It is equipped with a sampling module, a pre-processing module, a gas analysis module and a data transmission and monitoring platform: it can collect gas samples from multiple monitoring points, analyze them, and upload the data to the cloud platform or the environmental protection department's supervision system.

[0004] However, current sampling modules have problems with fixed sampling positions and inconvenient angle adjustment, resulting in the following limitations:

[0005] Sampling bias: When the emission source location or wind direction changes, the fixed sampling port cannot capture the actual exhaust gas concentration, and the data is poorly representative.

[0006] False alarm risk: Single sampling results are easily affected by local concentration fluctuations (such as equipment leakage and instantaneous emissions), which can easily trigger false alarms.

[0007] Low efficiency: Manual adjustment of the sampling port requires downtime, which increases operation and maintenance costs and makes it difficult to cover emission sources in multiple directions.

[0008] Existing technologies rely on manual calibration or mechanical fixed brackets, and are unable to dynamically respond to complex working conditions (such as unorganized emissions from chemical plants), making it difficult to meet increasingly stringent environmental regulatory requirements. Summary of the Invention

[0009] In response to the shortcomings of the existing technology, the present invention provides an online exhaust gas monitoring device using multi-channel sampling, which solves the problems of fixed sampling position and inconvenient angle adjustment in current sampling modules, which easily lead to sampling deviation, false alarm risk and low efficiency.

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions: an online exhaust gas monitoring device using multi-channel sampling, including an optional sampling module, a pretreatment module and a gas analysis module. The sampling module is responsible for collecting gas samples from the monitoring point, pre-treating the gas using the pretreatment module, converting the VOCs concentration into an electrical signal through the gas analysis module, and uploading the electrical signal to the monitoring platform. The sampling module includes:

[0011] A bracket comprising:

[0012] A fixed sleeve, which is fixedly installed at the monitoring point;

[0013] A movable sleeve, which is installed above the fixed sleeve;

[0014] A sampling assembly is installed on the top of the movable sleeve and is used for collecting gas;

[0015] A deflection unit, which is installed on the outside of the movable sleeve and is used to drive the sampling assembly to deflect at a vertical angle;

[0016] A rotating unit is installed at the connection between the fixed sleeve and the movable sleeve, and is used to drive the sampling assembly to rotate at a horizontal angle;

[0017] The sampling assembly, the deflection unit, the rotation unit and the gas analysis module are connected to a processor, and the processor controls the deflection unit and the rotation unit to work according to the VOCs concentration of the gas collected by the sampling assembly.

[0018] Preferably, the movable sleeve comprises:

[0019] a fixed section, which is rotatably mounted on top of the fixed sleeve;

[0020] a deflection section, which is disposed above the fixed section and connected to the sampling assembly;

[0021] The bellows section is fixedly installed between the fixed section and the deflection section.

[0022] Preferably, the sampling assembly comprises:

[0023] A protective cover is fixedly mounted on the top of the deflection section, and a plurality of ventilation holes communicating with the interior are optionally opened below the protective cover;

[0024] A sampling head, which is installed inside the protective cover;

[0025] The gas delivery pipeline is fixedly installed at the bottom of the sampling head and extends toward the interior of the bracket.

[0026] Preferably, the gas pipeline includes:

[0027] a fixed pipeline, which is located inside the fixed sleeve, and the bottom end of the fixed pipeline extends outward and is connected to the pretreatment module;

[0028] a movable pipeline, which is located inside the movable sleeve;

[0029] A sealing joint, which is fixedly installed on the top of the fixed pipeline;

[0030] A sealing ring, which is fixedly mounted on the bottom end of the movable pipeline and rotatably connected to the inner wall of the sealing joint;

[0031] The fixing clamp is fixedly arranged between the outer side of the movable pipeline and the inner wall of the movable sleeve.

[0032] Preferably, the deflection unit includes:

[0033] An electric push rod, which is fixedly installed on the outside of the fixed section;

[0034] A fixed shell, wherein two fixed shells are symmetrically installed at the front and rear of the fixed section;

[0035] A driving rack is vertically slidably disposed on the inner wall of the fixed housing and is transmission-connected to the electric push rod. The top end of the driving rack extends upward through the top of the fixed housing and is fixedly connected to a sealing block, and the sealing block abuts against the top of the fixed housing.

[0036] A transmission gear is rotatably mounted on the inner wall of the fixed housing and is meshed with the driving rack;

[0037] A rotating shaft is rotatably arranged on the inner wall of the fixed shell and fixedly plugged into the inner wall of the transmission gear, with an end portion of the rotating shaft passing through the outer wall of the fixed shell and extending outward;

[0038] The rotating arm is rotatably arranged outside the fixed shell, the bottom end of the rotating arm is fixedly connected to the end of the rotating shaft at the outside, and the top end of the rotating arm is connected to the deflection section.

[0039] Preferably, a lifting rod is fixedly mounted on the output end of the electric push rod, a sliding groove is provided on the outer side of the fixed shell, and the end of the lifting rod passes through the sliding groove and is fixedly connected to the bottom end of the driving rack.

[0040] Preferably, the top end of the rotating arm is fixedly connected to a connecting frame, and the connecting frame is fixedly connected to the deflection section, the outer side of the fixed shell is fixedly connected to a fixed arm, and the other end of the fixed arm is fixedly connected to the fixed section.

[0041] Preferably, the rotating unit includes:

[0042] A connecting tube, which is fixedly mounted on the top end of the fixed sleeve;

[0043] A rotating cylinder is fixedly connected to the bottom end of the fixed section and is rotatably connected to the inner wall of the connecting cylinder;

[0044] A transmission box, which is fixedly installed on the outside of the connecting cylinder;

[0045] The driving motor is fixedly installed on the outside of the fixed sleeve, and the output end of the driving motor is transmission-connected to the rotating cylinder.

[0046] Preferably, a transmission gear ring is embedded in the outer ring surface of the rotating cylinder, and a driving gear is rotatably connected to the inside of the transmission box. The driving gear is meshed with the transmission gear ring, and the output end of the driving motor extends toward the inside of the transmission box and is fixedly connected to the inner wall of the driving gear.

[0047] A transmission method for an exhaust gas online monitoring device using multi-channel sampling, the transmission method comprising the following steps:

[0048] Step 1: The sampling component samples the exhaust gas, which is then processed by the pre-processing unit and then analyzed by the gas analysis module;

[0049] Step 2: First detect whether the VOCs concentration is within the threshold. If the VOCs concentration is within the threshold, repeat step 1. If the VOCs concentration is greater than the upper threshold, start the deflection unit to deflect the movable sleeve and the sampling component on the top of the movable sleeve by 45 degrees, and start the rotation unit to drive the movable sleeve and the sampling component on the top of the movable sleeve to rotate, and then perform exhaust gas sampling;

[0050] Step 3: Check for the VOCs concentration within the threshold for the second time. When the VOCs concentration is within the threshold, start the deflection unit to reset, stop the rotation unit, and use the gas analysis module to send data to the monitoring platform. When the VOCs concentration is greater than the upper threshold, start the deflection unit to deflect the movable sleeve and the sampling component on the top of the movable sleeve by 90°, and start the rotation unit to drive the movable sleeve and the sampling component on the top of the movable sleeve to rotate, and then perform exhaust gas sampling.

[0051] Step 4: Check for the third time whether the VOCs concentration is within the threshold. When the VOCs concentration is within the threshold, start the deflection unit to reset, stop the rotation unit, and use the gas analysis module to send data to the monitoring platform. When the VOCs concentration is still greater than the upper threshold, use the gas analysis module to send data to the monitoring platform and issue a VOCs concentration exceeding standard signal. At the same time, start the deflection unit to reset and stop the rotation unit.

[0052] The present invention discloses an online exhaust gas monitoring device using multi-channel sampling and a transmission method thereof, which has the following beneficial effects:

[0053] The online exhaust gas monitoring device adopts multi-channel sampling. The sampling component is used to collect gas, the deflection unit is used to drive the sampling component to deflect at a vertical angle, and the rotation unit is used to drive the sampling component to rotate at a horizontal angle. The processor can control the deflection unit and the rotation unit to work according to the VOCs concentration of the gas collected by the sampling component. Through the three-time verification and detection mechanism, the sampling component is respectively collected at the initial position, the 45° deflection position and the 90° deflection position. The three-time detection logic eliminates instantaneous interference such as sudden change in wind direction, and confirms the alarm only after three times of exceeding the standard, which greatly reduces the false alarm rate.

[0054] During use, when the electric push rod is turned on, the output end of the exhaust gas online monitoring device using multi-channel sampling can push the drive rack to move vertically. Since the transmission gear is engaged with the drive rack, the transmission gear is driven to rotate. At the same time, the transmission gear is fixedly connected to the rotating arm through the rotating shaft, which can make the rotating arm flip over accordingly. The top of the rotating arm is connected to the deflection section, which can deflect the deflection section accordingly, so that the sampling component at the top of the deflection section can move accordingly, so that the sampling component can achieve vertical angle deflection adjustment.

[0055] The exhaust gas online monitoring device using multi-channel sampling can drive the driving gear to rotate at its output end when the driving motor is working. Since the driving gear is meshed with the transmission gear ring, the rotating cylinder can rotate accordingly, and then the fixed section at the top of the rotating cylinder can rotate accordingly, so that the sampling component can be rotated at a horizontal angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0057] Figure 1 This is a schematic diagram of the overall architecture of the present invention;

[0058] Figure 2 This is a diagram of the architecture between the sampling module and the gas analysis module of the present invention;

[0059] Figure 3 Schematic diagram of the overall process of the transmission method of the present invention;

[0060] Figure 4 This is a schematic structural diagram of the sampling module of the present invention;

[0061] Figure 5Schematic diagram of the structure of the bracket, deflection unit and rotation unit of the present invention;

[0062] Figure 6 It is a structural schematic diagram of the sampling assembly of the present invention;

[0063] Figure 7 Schematic diagram of the structure of the deflection unit of the present invention;

[0064] Figure 8 It is a partial structural schematic diagram of the deflection unit of the present invention;

[0065] Figure 9 It is a structural schematic diagram of the rotating unit of the present invention;

[0066] Figure 10 It is a vertical structural cross-sectional view of the rotating unit of the present invention;

[0067] Figure 11 It is a cross-sectional view of the horizontal structure of the rotating unit of the present invention.

[0068] In the figure: 1. bracket; 11. fixed sleeve; 12. movable sleeve; 121. fixed section; 122. deflection section; 123. bellows section; 2. sampling assembly; 21. protective cover; 211. air vent; 22. sampling head; 23. gas pipeline; 231. fixed pipeline; 232. movable pipeline; 233. sealing joint; 234. sealing ring; 235. fixing clamp; 3. deflection unit; 31. electric push rod; 311. lifting rod; 32. fixed shell; 321. slide groove; 33. driving rack; 331. sealing block; 34. transmission gear; 35. rotating shaft; 36. rotating arm; 361. connecting frame; 37. fixed arm; 4. rotating unit; 41. connecting cylinder; 42. rotating cylinder; 43. transmission box; 44. driving motor; 45. transmission gear ring; 46. driving gear. DETAILED DESCRIPTION

[0069] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0070] The embodiment of the present application solves the problems of fixed sampling position and inconvenient angle adjustment in current sampling modules, which easily lead to sampling deviation, false alarm risk and low efficiency, by providing an online exhaust gas monitoring device and a transmission method thereof using multi-channel sampling. The sampling component 2 is used for collecting gas, the deflection unit 3 is used to drive the sampling component 2 to deflect at a vertical angle, and the rotation unit 4 is used to drive the sampling component 2 to rotate at a horizontal angle. The processor can control the deflection unit 3 and the rotation unit 4 to work according to the VOCs concentration of the gas collected by the sampling component 2. Through a three-way verification and detection mechanism, gas is collected from the sampling component 2 at the initial position, 45° deflection position and 90° deflection position respectively. The three-way detection logic eliminates instantaneous interference such as sudden change in wind direction, and confirms the alarm only after three times of exceeding the standard, which greatly reduces the false alarm rate.

[0071] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0072] The embodiment of the present invention discloses an exhaust gas online monitoring device using multi-channel sampling and a transmission method thereof.

[0073] According to the attached Figure 1-11 As shown in the figure, an online exhaust gas monitoring device using multi-channel sampling includes an optional sampling module, a pretreatment module and a gas analysis module. The sampling module is responsible for collecting gas samples from the monitoring point, pre-processing the gas using the pretreatment module, converting the VOCs concentration into an electrical signal through the gas analysis module, and uploading the electrical signal to the monitoring platform. The modules used include:

[0074] A support 1 comprising:

[0075] A fixed sleeve 11, which is fixedly installed at the monitoring point;

[0076] A movable sleeve 12 is installed above the fixed sleeve 11;

[0077] A sampling assembly 2 is mounted on the top of the movable sleeve 12 and is used for collecting gas;

[0078] The deflection unit 3 is installed on the outside of the movable sleeve 12 and is used to drive the sampling assembly 2 to deflect in a vertical angle;

[0079] The rotating unit 4 is installed at the connection between the fixed sleeve 11 and the movable sleeve 12, and is used to drive the sampling assembly 2 to rotate at a horizontal angle;

[0080] The sampling component 2 , the deflection unit 3 , the rotation unit 4 and the gas analysis module are connected to a processor, and the processor controls the deflection unit 3 and the rotation unit 4 to work according to the VOCs concentration of the gas collected by the sampling component 2 .

[0081] The sampling component 2 is used for collecting gas, the deflection unit 3 is used to drive the sampling component 2 to deflect at a vertical angle, and the rotation unit 4 is used to drive the sampling component 2 to rotate at a horizontal angle. The processor can control the deflection unit 3 and the rotation unit 4 to work according to the VOCs concentration of the gas collected by the sampling component 2. Through the three-time verification and detection mechanism, the sampling component 2 is respectively subjected to gas collection at the initial position, the 45° deflection position and the 90° deflection position. The three-time detection logic eliminates instantaneous interference such as sudden changes in wind direction, and confirms the alarm only after three times of exceeding the standard, which greatly reduces the false alarm rate.

[0082] Specifically disclosed, the movable sleeve 12 includes:

[0083] The fixed section 121 is rotatably mounted on the top of the fixed sleeve 11;

[0084] The deflection section 122 is disposed above the fixed section 121 and connected to the sampling assembly 2;

[0085] The bellows section 123 is fixedly installed between the fixed section 121 and the deflecting section 122 .

[0086] The fixed section 121 and the deflecting section 122 are connected by the bellows section 123 , which can protect the fixed section 121 and the deflecting section 122 on the one hand, and enable the deflecting section 122 to rotate relative to the fixed section 121 on the other hand.

[0087] Specifically disclosed, the sampling assembly 2 includes:

[0088] The protective cover 21 is fixedly mounted on the top of the deflection section 122, and a plurality of vent holes 211 communicating with the interior are optionally provided below the protective cover 21;

[0089] The sampling head 22 is installed inside the protective cover 21;

[0090] The gas delivery pipeline 23 is fixedly installed at the bottom of the sampling head 22 and extends toward the interior of the bracket 1 .

[0091] By utilizing the protective cover 21 , the sampling head 22 is located inside the protective cover 21 , thereby protecting the sampling head 22 . At the same time, by utilizing the multiple air holes 211 below the protective cover 21 , the normal operation of the sampling head 22 is not affected.

[0092] Specifically disclosed, the gas transmission pipeline 23 includes:

[0093] A fixed pipeline 231 is located inside the fixed sleeve 11, and the bottom end of the fixed pipeline 231 extends outward and is connected to the pre-processing module;

[0094] The movable pipe 232 is located inside the movable sleeve 12;

[0095] A sealing joint 233, which is fixedly mounted on the top of the fixed pipe 231;

[0096] A sealing ring 234 is fixedly mounted on the bottom end of the movable pipe 232 and is rotatably connected to the inner wall of the sealing joint 233;

[0097] The fixing clamp 235 is fixedly disposed between the outer side of the movable pipeline 232 and the inner wall of the movable sleeve 12 .

[0098] During use, a sealing joint 233 is set at the top of the fixed pipeline 231, and a sealing ring 234 is set at the bottom of the movable pipeline 232. Therefore, when the movable sleeve 12 rotates, it can drive the movable pipeline 232 inside it to rotate relative to the fixed pipeline 231. Under the action of the sealing joint 233 and the sealing ring 234, the connection between the movable pipeline 232 and the fixed pipeline 231 can be sealed.

[0099] In particular, the deflection unit 3 comprises:

[0100] The electric push rod 31 is fixedly installed on the outer side of the fixed section 121;

[0101] Fixed shells 32, two fixed shells 32 are symmetrically installed at the front and rear of the fixed section 121;

[0102] The driving rack 33 is vertically slidably disposed on the inner wall of the fixed housing 32 and is in transmission connection with the electric push rod 31. The top end of the driving rack 33 passes through the top of the fixed housing 32, extends upward, and is fixedly connected to a sealing block 331, and the sealing block 331 abuts against the top of the fixed housing 32.

[0103] A transmission gear 34 is rotatably mounted on the inner wall of the fixed housing 32 and is meshed with the drive rack 33;

[0104] The rotating shaft 35 is rotatably mounted on the inner wall of the fixed housing 32 and fixedly plugged into the inner wall of the transmission gear 34. The end of the rotating shaft 35 passes through the outer wall of the fixed housing 32 and extends outward.

[0105] The rotating arm 36 is rotatably arranged outside the fixed housing 32 . The bottom end of the rotating arm 36 is fixedly connected to the end of the rotating shaft 35 on the outside, and the top end of the rotating arm 36 is connected to the deflection section 122 .

[0106] During use, when the electric push rod 31 is turned on, its output end can push the driving rack 33 to move vertically. Since the transmission gear 34 is meshed and connected with the driving rack 33, the transmission gear 34 is driven to rotate. At the same time, the transmission gear 34 is fixedly connected to the rotating arm 36 through the rotating shaft 35, which can make the rotating arm 36 flip over accordingly, and the top of the rotating arm 36 is connected to the deflection section 122, so that the deflection section 122 can be deflected accordingly, so that the sampling component 2 at the top of the deflection section 122 can move accordingly, so that the sampling component 2 can achieve vertical angle deflection adjustment.

[0107] Furthermore, a lifting rod 311 is fixedly installed at the output end of the electric push rod 31 , a sliding groove 321 is opened on the outer side of the fixed shell 32 , and the end of the lifting rod 311 passes through the sliding groove 321 and is fixedly connected to the bottom end of the driving rack 33 .

[0108] By using the provided lifting rod 311, the end of the lifting rod 311 passes through the sliding groove 321 and is fixedly connected to the bottom end of the driving rack 33, so that the lifting rod 311 can drive the driving rack 33 to move accordingly when moving vertically.

[0109] Furthermore, the top of the rotating arm 36 is fixedly connected to a connecting frame 361 , and the connecting frame 361 is fixedly connected to the deflection section 122 . The outer side of the fixed shell 32 is fixedly connected to a fixed arm 37 , and the other end of the fixed arm 37 is fixedly connected to the fixed section 121 .

[0110] The connecting frame 361 is provided to provide a stable connection between the top end of the rotating arm 36 and the deflection section 122 , and the fixing arm 37 is provided to provide an effective support for the fixing section 121 .

[0111] Specifically disclosed, the rotating unit 4 includes:

[0112] A connecting tube 41 is fixedly mounted on the top of the fixed sleeve 11;

[0113] The rotating cylinder 42 is fixedly connected to the bottom end of the fixed section 121 and is rotatably connected to the inner wall of the connecting cylinder 41;

[0114] A transmission box 43 is fixedly mounted on the outside of the connecting tube 41;

[0115] The driving motor 44 is fixedly mounted on the outside of the fixed sleeve 11 , and the output end of the driving motor 44 is transmission-connected to the rotating cylinder 42 .

[0116] Furthermore, a transmission gear ring 45 is embedded in the outer ring surface of the rotating cylinder 42, and a driving gear 46 is rotatably connected to the interior of the transmission box 43. The driving gear 46 is meshed with the transmission gear ring 45, and the output end of the driving motor 44 extends toward the interior of the transmission box 43 and is fixedly connected to the inner wall of the driving gear 46.

[0117] When the driving motor 44 is working, its output end can drive the driving gear 46 to rotate. Since the driving gear 46 is meshed and connected with the transmission gear ring 45, the rotating cylinder 42 can be rotated accordingly, and then the fixed section 121 at the top of the rotating cylinder 42 can be rotated accordingly, so that the sampling component 2 can be rotated at a horizontal angle.

[0118] A transmission method for an exhaust gas online monitoring device using multi-channel sampling, the transmission method comprising the following steps:

[0119] Step 1: The sampling component 2 samples the exhaust gas, which is then processed by the pre-processing unit and then analyzed by the gas analysis module;

[0120] Step 2: First detect whether the VOCs concentration is within the threshold. If the VOCs concentration is within the threshold, repeat step 1. If the VOCs concentration is greater than the upper threshold, start the deflection unit 3 to deflect the movable sleeve 12 and the sampling assembly 2 on the top of the movable sleeve 12 by 45 degrees, and start the rotation unit 4 to drive the movable sleeve 12 and the sampling assembly 2 on the top of the movable sleeve 12 to rotate, and then perform exhaust gas sampling.

[0121] Step 3: Detect whether the VOCs concentration is within the threshold for the second time. When the VOCs concentration is within the threshold, start the deflection unit 3 to reset, stop the rotation unit 4, and use the gas analysis module to send data to the monitoring platform. When the VOCs concentration is greater than the upper threshold, start the deflection unit 3 to deflect the movable sleeve 12 and the sampling component 2 on the top of the movable sleeve 12 by 90°, and start the rotation unit 4 to drive the movable sleeve 12 and the sampling component 2 on the top of the movable sleeve 12 to rotate, and then perform exhaust gas sampling;

[0122] Step 4: Check for the third time whether the VOCs concentration is within the threshold. When the VOCs concentration is within the threshold, start the deflection unit 3 to reset, stop the rotation unit 4, and use the gas analysis module to send data to the monitoring platform. When the VOCs concentration is still greater than the upper threshold, use the gas analysis module to send data to the monitoring platform and issue a VOCs concentration exceeding standard signal. At the same time, start the deflection unit 3 to reset, and stop the rotation unit 4.

[0123] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A transmission method for an exhaust gas online monitoring device using multi-channel sampling, characterized in that: The transmission method comprises the following steps: Step 1: The sampling component (2) samples the exhaust gas, and the exhaust gas is processed by the pre-processing unit and then analyzed by the gas analysis module; Step 2: First detect whether the VOCs concentration is within the threshold value. If the VOCs concentration is within the threshold value, repeat step 1. If the VOCs concentration is greater than the upper threshold value, start the deflection unit (3), deflect the movable sleeve (12) and the sampling assembly (2) on the top of the movable sleeve (12) by 45 degrees, and start the rotation unit (4) to drive the movable sleeve (12) and the sampling assembly (2) on the top of the movable sleeve (12) to rotate, and then perform exhaust gas sampling. Step 3: Detect whether the VOCs concentration is within the threshold value for the second time. When the VOCs concentration is within the threshold value, start the deflection unit (3) to reset, stop the rotation unit (4), and use the gas analysis module to send data to the monitoring platform. When the VOCs concentration is greater than the upper threshold value, start the deflection unit (3), deflect the movable sleeve (12) and the sampling component (2) on the top of the movable sleeve (12) by 90 degrees, and start the rotation unit (4) to drive the movable sleeve (12) and the sampling component (2) on the top of the movable sleeve (12) to rotate, and then perform exhaust gas sampling; Step 4: Detect for the third time whether the VOCs concentration is within the threshold value. When the VOCs concentration is within the threshold value, start the deflection unit (3) to reset, stop the rotation unit (4), and use the gas analysis module to send data to the monitoring platform. When the VOCs concentration is still greater than the upper threshold value, use the gas analysis module to send data to the monitoring platform and issue a VOCs concentration exceeding standard signal. At the same time, start the deflection unit (3) to reset, and stop the rotation unit (4). The multi-channel sampling exhaust gas online monitoring device includes an optional sampling module, a pretreatment module, and a gas analysis module. The sampling module is responsible for collecting gas samples from the monitoring point, pre-processing the gas using the pretreatment module, converting the VOCs concentration into an electrical signal through the gas analysis module, and uploading the electrical signal to the monitoring platform. The sampling module includes: A support (1) comprising: A fixed sleeve (11) is fixedly installed at the monitoring point; A movable sleeve (12) is mounted above the fixed sleeve (11); A sampling assembly (2) is mounted on the top of the movable sleeve (12), and the sampling assembly (2) is used for collecting gas; A deflection unit (3) is mounted on the outside of the movable sleeve (12), and the deflection unit (3) is used to drive the sampling assembly (2) to deflect at a vertical angle; A rotating unit (4) is installed at the connection between the fixed sleeve (11) and the movable sleeve (12), and the rotating unit (4) is used to drive the sampling assembly (2) to rotate at a horizontal angle; The sampling component (2), the deflection unit (3), the rotation unit (4) and the gas analysis module are connected to a processor, and the processor controls the deflection unit (3) and the rotation unit (4) to operate according to the VOCs concentration of the gas collected by the sampling component (2).

2. The transmission method of the exhaust gas online monitoring device using multi-channel sampling according to claim 1 is characterized in that: The movable sleeve (12) comprises: A fixed section (121) rotatably mounted on the top of the fixed sleeve (11); A deflection section (122) is disposed above the fixed section (121) and connected to the sampling assembly (2); The bellows section (123) is fixedly installed between the fixed section (121) and the deflection section (122).

3. The transmission method of the exhaust gas online monitoring device using multi-channel sampling according to claim 1 is characterized in that: The sampling component (2) comprises: A protective cover (21) is fixedly mounted on the top of the deflection section (122), and a plurality of vent holes (211) communicating with the interior are optionally provided below the protective cover (21); A sampling head (22) is installed inside the protective cover (21); The gas delivery pipeline (23) is fixedly installed at the bottom of the sampling head (22), and the gas delivery pipeline (23) extends toward the interior of the bracket (1).

4. The transmission method of the exhaust gas online monitoring device using multi-channel sampling according to claim 3 is characterized in that: The gas transmission pipeline (23) comprises: A fixed pipeline (231) is located inside the fixed sleeve (11), and the bottom end of the fixed pipeline (231) extends outward and is connected to the pre-processing module; a movable pipeline (232) located inside the movable sleeve (12); A sealing joint (233) fixedly mounted on the top of the fixed pipe (231); A sealing ring (234) is fixedly mounted on the bottom end of the movable pipe (232), and the sealing ring (234) is rotatably connected to the inner wall of the sealing joint (233); A fixing clamp (235) is fixedly arranged between the outer side of the movable pipeline (232) and the inner wall of the movable sleeve (12).

5. The transmission method of the exhaust gas online monitoring device using multi-channel sampling according to claim 2 is characterized in that: The deflection unit (3) comprises: An electric push rod (31) is fixedly mounted on the outside of the fixed section (121); A fixed shell (32), wherein two fixed shells (32) are symmetrically installed at the front and rear of the fixed section (121); A driving rack (33) is vertically slidably arranged on the inner wall of the fixed shell (32) and is transmission-connected to the electric push rod (31); the top end of the driving rack (33) passes through the top of the fixed shell (32) and extends upward and is fixedly connected to a sealing block (331), and the sealing block (331) abuts against the top of the fixed shell (32); A transmission gear (34) is rotatably mounted on the inner wall of the fixed housing (32), and the transmission gear (34) is meshedly connected with the driving rack (33); A rotating shaft (35) is rotatably mounted on the inner wall of the fixed housing (32) and fixedly plugged into the inner wall of the transmission gear (34). The end of the rotating shaft (35) passes through the outer wall of the fixed housing (32) and extends outward. The rotating arm (36) is rotatably arranged outside the fixed shell (32), the bottom end of the rotating arm (36) is fixedly connected to the end of the rotating shaft (35) at the outside, and the top end of the rotating arm (36) is connected to the deflection section (122).

6. The transmission method of the exhaust gas online monitoring device using multi-channel sampling according to claim 5 is characterized in that: A lifting rod (311) is fixedly mounted on the output end of the electric push rod (31), a sliding groove (321) is provided on the outer side of the fixed shell (32), and the end of the lifting rod (311) passes through the sliding groove (321) and is fixedly connected to the bottom end of the driving rack (33).

7. The transmission method of the exhaust gas online monitoring device using multi-channel sampling according to claim 5 is characterized in that: The top end of the rotating arm (36) is fixedly connected to a connecting frame (361), and the connecting frame (361) is fixedly connected to the deflection section (122). The outer side of the fixed shell (32) is fixedly connected to a fixed arm (37), and the other end of the fixed arm (37) is fixedly connected to the fixed section (121).

8. The transmission method of the exhaust gas online monitoring device using multi-channel sampling according to claim 2 is characterized in that: The rotating unit (4) comprises: A connecting tube (41) fixedly mounted on the top end of the fixed sleeve (11); A rotating cylinder (42) is fixedly connected to the bottom end of the fixed section (121), and the rotating cylinder (42) is rotatably connected to the inner wall of the connecting cylinder (41); A transmission box (43) is fixedly mounted on the outside of the connecting tube (41); The driving motor (44) is fixedly mounted on the outside of the fixed sleeve (11), and the output end of the driving motor (44) is transmission-connected to the rotating cylinder (42).

9. The transmission method of the exhaust gas online monitoring device using multi-channel sampling according to claim 8, characterized in that: A transmission gear ring (45) is embedded in the outer ring surface of the rotating cylinder (42), and a driving gear (46) is rotatably connected to the interior of the transmission box (43). The driving gear (46) is meshed with the transmission gear ring (45), and the output end of the driving motor (44) extends toward the interior of the transmission box (43) and is fixedly connected to the inner wall of the driving gear (46).

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