Exhaust gas detection device for industrial factory building

Abstract

The invention provides an exhaust gas detection device for an industrial factory building, and relates to the technical field of gas detection, the exhaust gas detection device comprises a wall plate, a control box and an exhaust funnel body, two lamp strip bodies are fixedly mounted on the outer side of the exhaust funnel body, and a connecting assembly is arranged in the exhaust funnel body. Each connecting assembly comprises a supporting frame, a cross beam frame and a sampling pipe, two shaft sleeves are fixedly mounted on the outer surface of each sampling pipe, a pivot is rotatably mounted in each sampling pipe, a sleeve box is fixedly mounted at the tail end of each pivot, and detection probes are fixedly mounted at the two side end parts of each sleeve box; jet flow plates are fixedly installed at the two ends of the sleeve box, an exhaust port is formed in the outer side of each jet flow plate, high-pressure clean air is conveyed to the self-rotating ring sleeve through the air inlet header pipe by means of the external control box, stable air inlet can be kept when the sleeve box rotates, the surface of the detection probe is directly cleaned through the exhaust ports, and the detection precision is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of gas detection technology, and more specifically, relates to a gas emission detection device for industrial plants. Background Technology

[0002] Air pollution is one of the most prominent environmental problems in my country. Industrial waste gas emitted by various production enterprises in my country is an important source of air pollutants. In order to protect the environment, exhaust gas detection devices are usually installed at the exhaust outlets of industrial plants.

[0003] The online continuous monitoring system has a detection device installed directly on the emission pipe or exhaust stack, which captures the gas composition in real time through built-in sensors (such as infrared, electrochemical, and ultraviolet sensors).

[0004] 1. The monitoring device is directly installed on the inner wall of the pipeline. The temperature of industrial waste gas can reach hundreds of degrees Celsius. The high-pressure airflow continuously impacts the sensor. In addition, the vibration of the pipeline during equipment operation will accelerate the damage to the detection sensor. Once a single sensor is structurally damaged, it will directly lead to the interruption of monitoring.

[0005] 2. Industrial waste gas contains not only gaseous pollutants, but also dust and fumes. Fine dust and sticky fumes will flow through the sampling channel with the airflow and directly adhere to the sensor, causing the response speed to slow down, the detection data to deviate from the true value, and also accelerating the damage to the sensor. Frequent sensor replacement will increase the operating cost. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides an emission gas detection device for industrial plants.

[0007] An emission gas detection device for an industrial plant includes a wall panel, a control box, and an exhaust stack body. Two light strip bodies are fixedly installed on the outer side of the exhaust stack body. The device also includes...

[0008] A connecting assembly is disposed inside the exhaust stack body. Each connecting assembly includes a support frame, a crossbeam frame, and a sampling tube. Two bushings are fixedly installed on the outer surface of the sampling tube. A pivot is rotatably installed inside the sampling tube. A sleeve is fixedly installed at the end of the pivot. Detection probes are fixedly installed on both sides of the sleeve. Spray plates are fixedly installed at both ends of the sleeve. An exhaust port is provided on the outer side of each spray plate.

[0009] Hollow sleeve shafts are fixedly installed on the side ends of the sleeve box. An internal tube is fixedly installed inside the hollow sleeve shaft. A flow divider box is fixedly installed at the end of the hollow sleeve shaft. Flexible hoses are provided on both sides of the flow divider box. The end of each flexible hose is connected to the jet plate.

[0010] Preferably, a spin ring is rotatably mounted at the end of the built-in tube, and an air intake manifold is fixedly mounted at the end of the spin ring. The end of the air intake manifold is connected to an external control box.

[0011] A limiting ring is fixedly installed on the surface of the pivot, and the surface of the limiting ring is provided with two grooves. A transmission gear is provided at the top of the pivot.

[0012] A mounting base is fixedly installed on the outside of the sampling tube, and a locking rod is slidably installed at the end of the mounting base. An electric push rod is provided at the top of the locking rod.

[0013] Preferably, a miniature motor box is fixedly installed at the top of the crossbeam frame, and a transmission shaft is rotatably installed at the top of the miniature motor box. The transmission shaft meshes with one end of a pivot, and an electrical interface is provided on the outside of the miniature motor box.

[0014] A flow guide plate is fixedly installed on the inner side of the sampling tube, and a closing plate is fixedly installed on the top of the flow guide plate. The flow guide plate has a conical structure.

[0015] The sampling tube is provided with a one-way valve plate on its inner side. The one-way valve plate has a segmented structure and a support shaft is provided at the top of the one-way valve plate.

[0016] Preferably, two filter membrane plates are fixedly installed inside the sampling tube, and the two filter membrane plates form a group. Each filter membrane plate is provided with a sealing strip on its outer side.

[0017] A flow guide is fixedly installed at the end of the sampling tube, and the flow guide is connected to the end of the sampling tube by a buckle.

[0018] A top cover is fixedly installed at the top of the sampling tube, a vent pipe is fixedly installed at the top of the top cover, a solenoid valve is provided inside the vent pipe, and a wire body is fixedly installed at the top of the top cover.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In this invention, a miniature motor box drives a transmission shaft, which, in conjunction with a transmission gear at the top of the pivot, drives the sleeve and hollow sleeve shaft to rotate synchronously. This allows for the alternating use of two sets of detection probes, avoiding the wear and tear of a single probe working continuously, and adding a backup sensor. When a single sensor fails, the sensor automatically switches to ensure uninterrupted detection.

[0021] In this invention, high-pressure clean air is delivered to the spinning ring sleeve through the intake manifold via an external control box. The segmented hollow structure of the spinning ring sleeve, in conjunction with the rotational connection of the internal tube, can maintain stable air intake when the sleeve rotates. The high-pressure air is delivered to the jet plate through the internal tube, the split box, and the hose, and directly cleans the surface of the detection probe through the exhaust port, ensuring detection accuracy.

[0022] In this invention, high-pressure clean air is delivered to the spray plates at both ends of the casing via hoses on both sides of the split box. After the high-pressure clean air is ejected from the exhaust port on the outside of the spray plate, in addition to directly cleaning the surface of the detection probe, some of the airflow will diffuse into the internal space of the sampling tube. Through the cooperation of the high-pressure clean air and the solenoid valve of the vent pipe, the residual industrial waste gas inside the sampling tube can be completely replaced, avoiding the mixing of residual waste gas with the waste gas sample collected next time.

[0023] In this invention, the gas discharged from the exhaust stack is guided by a flow guide hood and drawn into the sampling tube. A filter membrane is installed inside the sampling tube to filter the incoming gas, removing dust and moisture. At the same time, the conical flow guide plate guides the exhaust gas through the one-way valve plate to the side end of the casing, so that the exhaust gas concentrates and impacts the detection probe, ensuring that the probe contacts a uniform exhaust gas sample and improving the accuracy of concentration detection.

[0024] In this invention, the gas discharged from the inside of the exhaust stack is guided by the flow guide hood and drawn into the inside of the sampling tube. The gas is connected to the end of the sampling tube by a buckle, which is convenient to install and disassemble and has strong sealing performance. It can prevent outside air from seeping into the sampling tube, prevent the waste gas sample from being diluted, and guide the waste gas in the exhaust stack to gather efficiently. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the exhaust pipe body structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the LED strip body structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the crossbeam frame structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the sampling tube structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the filter membrane structure of the present invention;

[0030] Figure 6 This is a schematic diagram of the pivot structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the sleeve structure of the present invention;

[0032] Figure 8 This is the present invention. Figure 4 A magnified structural diagram at point A.

[0033] In the diagram, 11. Wall panel; 12. Control box; 13. Exhaust pipe body; 14. Light strip body; 15. Support frame; 16. Crossbeam frame; 17. Sampling tube; 18. Top cover; 19. Vent pipe; 21. Wire body; 22. One-way valve plate; 23. Filter membrane plate; 24. Flow guide; 25. Bushing; 26. Drain plate; 27. Closing plate; 28. Miniature motor box; 29. ​​Drive shaft; 31. Mounting base; 32. Locking rod; 33. Pivot; 34. Limit ring; 35. Sleeve box; 36. Detection probe; 37. Spray plate; 38. Exhaust port; 39. Hollow sleeve shaft; 41. Internal tube; 42. Spin ring sleeve; 43. Main intake pipe; 44. Diverter box; 45. Hose. Detailed Implementation

[0034] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0035] Please see Figure 1 - Figure 8 The present invention provides an emission gas detection device for an industrial plant, including a wall panel 11, a control box 12 and an exhaust pipe body 13. Two light strip bodies 14 are fixedly installed on the outside of the exhaust pipe body 13. When the detection probe 36 detects that the gas emitted inside the exhaust pipe body 13 exceeds the threshold, the two sets of light strip bodies 14 on the outside of the exhaust pipe body 13 can be lit through the outwardly extending wire body 21, so as to directly warn the operators.

[0036] The connecting components are located inside the exhaust stack body 13. Each connecting component includes a support frame 15, a crossbeam frame 16, and a sampling tube 17. Two bushings 25 are fixedly installed on the outer surface of the sampling tube 17. A pivot 33 is rotatably installed inside the sampling tube 17. A housing 35 is fixedly installed at the end of the pivot 33. Detection probes 36 are fixedly installed on both sides of the housing 35. Spray plates 37 are fixedly installed at both ends of the housing 35. Each spray plate 37 has an exhaust port 38 on its outer side. The detection probe 36 is specifically an electrochemical sensor. After the gas enters the sensor, it undergoes an oxidation-reduction reaction with the electrodes and electrolyte, generating a weak current. The magnitude of the current is linearly related to the gas concentration. The concentration data is obtained by measuring the current value and then directed to the spray plate. High-pressure clean air is supplied inside the plate 37. The high-pressure clean air is blown onto the surface of the detection probe 36 through the exhaust ports 38 on both sides of the jet plate 37. The high-pressure clean air is also supplied to the inside of the sampling tube 17 through the exhaust ports 38. By supplying high-pressure clean air into the sampling tube 17 and opening the solenoid valve inside the vent pipe 19, the residual exhaust gas inside the sampling tube 17 can be replaced. By moving the crossbeam frame 16, the crossbeam frame 16 drives the sampling tube 17 to enter the exhaust pipe body 13 simultaneously. The crossbeam frame 16 is aligned with the inside of the support frame 15. The two ends of the crossbeam frame 16 are inserted into the inside of the support frame 15. By rotating the two screws on the inside of the crossbeam frame 16, the support frame 15 and the crossbeam frame 16 are assembled and installed.

[0037] Hollow sleeve shafts 39 are fixedly installed on the side ends of the sleeve 35. An internal tube 41 is fixedly installed inside the hollow sleeve shaft 39. A diverter box 44 is fixedly installed at the end of the hollow sleeve shaft 39. A hose 45 is provided on both sides of the diverter box 44. The end of each hose 45 is connected to the spray plate 37. High-pressure clean air enters the interior of the diverter box 44 through the internal tube 41, and then the high-pressure clean air is delivered to the spray plate 37 through the two sets of hoses 45 respectively.

[0038] A spinning ring 42 is rotatably installed at the end of the built-in tube 41. An air intake manifold 43 is fixedly installed at the end of the spinning ring 42. The end of the air intake manifold 43 is connected to the external control box 12. When the box 35 rotates, the box 35 drives the hollow sleeve shaft 39 to rotate synchronously. The built-in tube 41 is installed inside the hollow sleeve shaft 39. The spinning ring 42 is installed at the end of the built-in tube 41. The hollow sleeve shaft 39 drives the built-in tube 41 to rotate. The spinning ring 42 has a segmented structure. The inside of the spinning ring 42 is a hollow structure. High-pressure clean air is delivered to the inside of the spinning ring 42 through the air intake manifold 43. The high-pressure clean air enters the inside of the split box 44 through the built-in tube 41.

[0039] A limiting ring 34 is fixedly installed on the surface of the pivot 33. The surface of the limiting ring 34 is provided with two grooves. A transmission gear is provided at the top of the pivot 33. Through the transmission gear and the transmission shaft 29, the rotating transmission shaft 29 drives the pivot 33 to rotate. The pivot 33 rotates at a constant speed inside the bushing 25. The pivot 33 can drive the sleeve 35 and the hollow sleeve shaft 39 to rotate synchronously. The hollow sleeve shaft 39 also rotates inside the bushing 25. The sleeve 35 rotates at the top of the drainage plate 26, which allows the two sets of detection probes 36 to be used alternately. After the sleeve 35 rotates, the outer side of the sleeve 35 aligns with the closing piece 27.

[0040] A mounting base 31 is fixedly installed on the outside of the sampling tube 17. A locking rod 32 is slidably installed at the end of the mounting base 31. An electric push rod is provided at the top of the locking rod 32. By extending and retracting the electric push rod, the locking rod 32 is pulled to move. The locking rod 32 is guided to slide into the mounting base 31. The top of the locking rod 32 leaves the surface of the limiting ring 34, releasing the fixed state of the pivot 33.

[0041] A miniature motor box 28 is fixedly installed at the top of the crossbeam frame 16. A transmission shaft 29 is rotatably installed at the top of the miniature motor box 28. The transmission shaft 29 meshes with one end of the pivot 33. An electrical interface is provided on the outside of the miniature motor box 28. By driving the miniature motor box 28, the miniature motor box 28 drives the transmission shaft 29 to rotate, and the transmission shaft 29 rotates clockwise at the top of the miniature motor box 28.

[0042] A flow guide plate 26 is fixedly installed on the inner side of the sampling tube 17. A closing piece 27 is fixedly installed on the top of the flow guide plate 26. The flow guide plate 26 has a conical structure. The flow guide plate 26 guides the gas that is discharged. The gas is guided through the flow guide plate 26 to the side end of the sleeve 35. The gas continuously impacts one end of the sleeve 35. The detection probe 36 is used to detect the gas that enters the sampling tube 17.

[0043] A one-way valve plate 22 is provided on the inner side of the sampling tube 17. The one-way valve plate 22 has a segmented structure and a support shaft is provided at the top of the one-way valve plate 22. The gas filtered by the filter membrane plate 23 continues to flow upward. The gas hits one side of the one-way valve plate 22. When the waste gas inside the sampling tube 17 flows in the forward direction, the airflow pressure acts on the force surface of the one-way valve plate 22. After the pressure value exceeds the closing resistance of the one-way valve plate 22, the one-way valve plate 22 rotates unidirectionally around the support shaft, gradually opening the channel and allowing the gas to continue to rise and flow. When the pressure value inside the sampling tube 17 continues to increase, the force balance of the one-way valve plate 22 is broken. Under the action of the spring reset force or the reverse airflow pressure, the one-way valve plate 22 rotates in the opposite direction around the axis, re-fits the inner side of the sampling tube 17, and returns to the closed state.

[0044] Two filter membrane plates 23 are fixedly installed inside the sampling tube 17. The two filter membrane plates 23 form a group. Each filter membrane plate 23 has a sealing strip on its outer side. The gas discharged from the exhaust pipe body 13 is guided by the flow guide hood 24 and drawn into the sampling tube 17. The filter membrane plates 23 are installed inside the sampling tube 17 to filter the incoming gas, filter dust and remove water vapor.

[0045] A flow guide hood 24 is fixedly installed at the end of the sampling tube 17. The flow guide hood 24 is connected to the end of the sampling tube 17 by a buckle. It is easy to install and disassemble, has strong sealing performance, and avoids the infiltration of external air from affecting the detection accuracy. The flow guide hood 24 guides the exhaust gas to gather efficiently, avoiding the insufficient sampling representativeness caused by uneven airflow in the pipeline, and ensuring that the sensor captures a uniform and real exhaust gas sample.

[0046] A top cover 18 is fixedly installed at the top of the sampling tube 17, and a vent pipe 19 is fixedly installed at the top of the top cover 18. A solenoid valve is provided inside the vent pipe 19. A wire body 21 is fixedly installed at the top of the top cover 18. The wire body 21 is connected to the inside of the casing 35 to transmit the detected data to the outside of the sampling tube 17. A solenoid valve is installed inside the vent pipe 19. When the sampling tube 17 needs to collect gas, the solenoid valve is closed, and the gas enters through the end of the sampling tube 17. The sampled gas enters the inside of the sampling tube 17 for easy detection. At the same time, when the detection is completed, the solenoid valve inside the vent pipe 19 is opened to discharge the sampled gas again.

[0047] Working principle:

[0048] First, move the crossbeam frame 16 to simultaneously drive the sampling tube 17 into the interior of the exhaust pipe body 13. Align the crossbeam frame 16 with the inner side of the support frame 15, insert both ends of the crossbeam frame 16 into the interior of the support frame 15, and rotate the screws on the inner side of the crossbeam frame 16 to complete the fixation of the support frame 15 and the crossbeam frame 16, so that the sampling tube 17 is stably placed inside the exhaust pipe body 13.

[0049] The exhaust gas emitted from the exhaust stack body 13 is guided and efficiently converged by the guide shroud 24 (connected by snap-fit, ensuring strong sealing and preventing outside air infiltration) at the end of the sampling tube 17, solving the problem of uneven airflow in the pipeline and ensuring that the collected exhaust gas sample is representative. After the converged exhaust gas enters the sampling tube 17, it first passes through two sets of filter membranes 23 (with sealing strips on the outside to ensure sealing and prevent unfiltered gas leakage). The filter membranes 23 intercept dust and remove moisture from the exhaust gas, preventing impurities from contaminating subsequent testing components. When the exhaust gas discharged from the factory flows into the sampling tube 17, a torsion spring is sleeved on the support shaft of the one-way valve plate 22, and one end of the torsion spring is snapped into a pre-set side of the one-way valve plate 22. The other end is attached to the corresponding protrusion on the inner side of the sampling tube 17. When the airflow pressure exceeds the closing resistance of the one-way valve plate 22, the one-way valve plate 22 rotates unidirectionally around the support shaft, opening the channel and allowing the exhaust gas to continue to rise. If the pressure inside the sampling tube 17 fluctuates (such as during the cleaning stage), the reverse airflow pressure or spring reset force will cause the one-way valve plate 22 to rotate in the opposite direction around the shaft, re-attach to the inner side of the sampling tube 17, and restore the closed state to prevent gas backflow. The exhaust gas passing through the one-way valve plate 22 is guided by the guide plate 26 (conical structure) on the inner side of the sampling tube 17 to the side end of the sleeve 35, so that the exhaust gas concentrates and impacts one end of the sleeve 35, ensuring that the detection probe 36 can capture a uniform exhaust gas sample.

[0050] In the second step, after the detection probes 36 (electrochemical sensors) on both sides of the housing 35 come into contact with the exhaust gas, the exhaust gas undergoes an oxidation-reduction reaction with the electrodes and electrolyte inside the sensor, generating a weak current during the reaction. Since the magnitude of the current is linearly related to the gas concentration, the exhaust gas concentration data can be obtained by measuring the current value, driving the micro motor housing 28 at the top of the crossbeam frame 16, which in turn drives the transmission shaft 29 to rotate clockwise. The transmission shaft 29 meshes with the transmission gear at the top of the pivot 33 (rotating inside the sampling tube 17 and in the bushing 25), thereby driving the pivot 33 in the bushing 25. 5. Before rotation, the electric push rod on the outer mounting base 31 of the sampling tube 17 retracts, pulling the locking rod 32 to slide into the mounting base 31, so that the top of the locking rod 32 leaves the groove of the limiting ring 34 on the surface of the pivot 33, releasing the fixation of the pivot 33. The pivot 33 drives the sleeve 35 and the hollow sleeve shaft 39 to rotate synchronously, so that the detection probes 36 on both sides of the sleeve 35 can be used alternately (to avoid the wear and tear of a single probe working continuously). After rotation, the outer side of the sleeve 35 aligns with the closing piece 27 at the top of the drainage plate 26, realizing the sealing switch of the detection position.

[0051] The external control box 12 supplies high-pressure clean air to the spinning ring sleeve 42 (segmented hollow structure) through the main air intake pipe 43. Since the spinning ring sleeve 42 is rotatably connected to the internal tube 41 (inside the hollow sleeve shaft 39), when the sleeve 35 rotates, the internal tube 41 can rotate synchronously with the hollow sleeve shaft 39, while the spinning ring sleeve 42 maintains stable air intake. The high-pressure clean air enters the diverter box 44 through the internal tube 41, and is then delivered to the jet plate 37 through two sets of hoses 45, and finally sprayed out from the exhaust port 38 on the outside of the jet plate 37: on the one hand, it directly cleans the surface of the detection probe 36 (avoiding impurities from adhering and affecting the detection). On the one hand, high-pressure air is sent into the sampling tube 17, and the solenoid valve inside the vent pipe 19 at the top of the top cover 18 is opened. The high-pressure clean air will discharge the residual waste gas inside the sampling tube 17 through the vent pipe 19, completing the replacement of waste gas in the pipeline and ensuring the accuracy of the next sample test. The concentration data of the detection probe 36 is transmitted to the outside through the wire body 21 at the top of the top cover 18 (connected to the inside of the casing 35). When the detected data exceeds the threshold, the control box 12 triggers a signal to light up the two sets of light strip bodies 14 on the outside of the exhaust pipe body 13, directly warning the on-site operators.

[0052] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An exhaust gas detection device for an industrial plant, comprising a wallboard (11), a control box (12) and an exhaust cylinder body (13), two lamp strip bodies (14) being fixedly installed on the outer side of the exhaust cylinder body (13), characterized in that, Also include; The connecting assembly is arranged in the inside of the exhaust cylinder body (13), the connecting assembly includes support frame (15), cross beam frame (16) and sampling pipe (17), the outer surface of the sampling pipe (17) is fixedly installed with two shaft sleeves (25), the inside of the sampling pipe (17) is rotatably installed with a pivot (33), the end of the pivot (33) is fixedly installed with a sleeve box (35), the two side ends of the sleeve box (35) are fixedly installed with detection probe (36), the two ends of the sleeve box (35) are fixedly installed with jet plate (37), the outer side of each jet plate (37) is provided with exhaust port (38); The side end of the sleeve box (35) is fixedly installed with a hollow sleeve shaft (39), the inside of the hollow sleeve shaft (39) is fixedly installed with an internal tube (41), the end of the hollow sleeve shaft (39) is fixedly installed with a shunt box (44), the two side ends of the shunt box (44) are provided with a hose (45), and the end of each hose (45) is communicated with the jet plate (37).

2. The apparatus for detecting exhaust gas of an industrial plant according to claim 1, wherein The end of the internal tube (41) is rotatably installed with a spin ring (42), the end of the spin ring (42) is fixedly installed with an intake manifold (43), and the end of the intake manifold (43) is communicated with an external control box (12).

3. The apparatus for detecting exhaust gas of an industrial plant according to claim 1, wherein The surface of the pivot (33) is fixedly installed with a limit ring (34), the surface of the limit ring (34) is provided with two grooves, and the top end of the pivot (33) is provided with a transmission gear.

4. The apparatus for detecting exhaust gas of an industrial plant according to claim 1, wherein The outer side of the sampling pipe (17) is fixedly installed with a mounting seat (31), the end of the mounting seat (31) is slidably installed with a locking plug rod (32), and the top end of the locking plug rod (32) is provided with an electric push rod.

5. The apparatus for detecting exhaust gas of an industrial plant according to claim 1, wherein The top end of the cross beam frame (16) is fixedly installed with a micro motor box (28), the top end of the micro motor box (28) is rotatably installed with a transmission shaft rod (29), the transmission shaft rod (29) is engaged with one end of the pivot (33), and the outer side of the micro motor box (28) is provided with an electrical interface.

6. The apparatus for detecting exhaust gas of an industrial plant according to claim 1, wherein The inner side of the sampling pipe (17) is fixedly installed with a drainage plate (26), the top end of the drainage plate (26) is fixedly installed with a closure piece (27), and the drainage plate (26) is in a conical structure.

7. The apparatus for detecting exhaust gas of an industrial plant according to claim 1, wherein The inner side of the sampling pipe (17) is provided with a one-way valve plate (22), the one-way valve plate (22) is in a segmented structure, and the top end of the one-way valve plate (22) is provided with a support shaft.

8. The apparatus for detecting exhaust gas of an industrial plant according to claim 1, wherein The inside of the sampling pipe (17) is fixedly installed with two filter membrane plates (23), the two filter membrane plates (23) are a group, and the outer side of each filter membrane plate (23) is provided with a sealing rubber strip.

9. The apparatus for detecting exhaust gas of an industrial plant according to any one of claims 1 to 8, wherein The end of the sampling pipe (17) is fixedly installed with a flow guide cover (24), and the flow guide cover (24) is connected with the end of the sampling pipe (17) through buckles.

10. The apparatus for detecting exhaust gas of an industrial plant according to any one of claims 1 to 8, wherein The top end of the sampling pipe (17) is fixedly installed with a top cover (18), the top end of the top cover (18) is fixedly installed with a deflation pipe (19), the inner side of the deflation pipe (19) is provided with a solenoid valve, and the top end of the top cover (18) is fixedly installed with a wire body (21).

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