Harmful gas monitoring system

Abstract

The invention relates to the technical field of harmful gas monitoring, in particular to a harmful gas monitoring system which comprises a monitor and a detection cylinder, the monitor is eccentrically installed on the bottom face of the detection cylinder in a penetrating mode, the detection end of the monitor is flush with the bottom of the detection cylinder, and a multi-cavity column capable of rotating through power is installed in the detection cylinder. One side of the detection cylinder is vertically provided with a length-changeable gas collecting structure, the gas collecting structure is communicated with the external environment, the gas outlet end of the gas collecting structure is eccentrically installed on the bottom surface of the detection cylinder in a penetrating manner, and an exhaust pipe is installed on the bottom surface of the detection cylinder in a penetrating manner. By arranging the multi-cavity column, the gas collecting structure and other components, the length of the gas collecting structure is controlled, toxic gas in the corresponding height range can enter the gas collecting structure and then is filled between the multi-cavity column and the detection cylinder, the monitor detects the content of the toxic gas in the corresponding height range, the detected toxic gas is exhausted from the exhaust pipe, and the detection efficiency is improved. The toxic gas in the air can be continuously monitored in time.

Description

Technical Field

[0001] The present invention relates to the technical field of harmful gas monitoring, and in particular to a harmful gas monitoring system. Background Art

[0002] During the processing and production of some chemical products, chemical reactions will occur due to the high temperature of processing, thereby releasing certain gases. When a certain gas is released excessively in a space, it will lead to excessive gas concentration, which will become harmful to the human body and cause life safety. According to the national toxic and harmful gas safety standards: before people are allowed to enter the area, toxic and harmful gases must meet the specified value requirements.

[0003] Chinese patent CN118962024A discloses a harmful gas monitoring device, including a detection box, an air inlet fixedly connected to one side of the detection box, an air outlet fixedly connected to the other side of the detection box, a support leg fixedly connected to the bottom of the detection box, a fixed cylinder provided inside the detection box, a plurality of first support columns fixedly connected to the outside of the fixed cylinder, and the plurality of first support columns are all fixedly connected to the detection box. The invention pulls the adjustment plate. The adjustment plate is pulled due to the fixed connection with the rotating ring. The pulling of the adjustment plate will drive the guide straight groove to swing. At this time, the swing of the upper end of the guide straight groove will change to the rotation of the lower end. The rotation of the second connecting column will drive the rotating fan plate to rotate, thereby opening and closing the internal fan surface, so as to control the amount of gas passing through, so that the passing gas can better contact with the detection column and improve the detection effect. The above-mentioned related technologies have the following defects: When the equipment in the prior art detects harmful gases in the space, although the error caused by spatial flow is reduced by drawing harmful gases into the equipment for detection, the extraction points of the equipment are relatively concentrated and fixed, and the harmful gas content at different heights is different. The more concentrated extraction points will cause inaccurate detection results. For this reason, a harmful gas monitoring system is proposed. Summary of the Invention

[0004] In order to extract gases in spaces at different heights into one space at the same time when extracting gases in the space, thereby increasing the accuracy of the detection results, the present invention provides a harmful gas monitoring system.

[0005] The present invention provides a harmful gas monitoring system, which adopts the following technical solution: it includes a monitor and a detection tube, wherein the monitor is eccentrically installed through the bottom surface of the detection tube, the detection end of the monitor is flush with the bottom of the detection tube, a multi-cavity column that can be rotated by power is installed inside the detection tube, and a gas collecting structure with variable length is vertically arranged on one side of the detection tube. The gas collecting structure is connected to the external environment, and the gas outlet end of the gas collecting structure is eccentrically installed through the bottom surface of the detection tube.

[0006] An exhaust pipe is installed through the bottom surface of the detection cylinder, and the exhaust pipe is located between the air collection structure and the monitor.

[0007] Optionally, the outer ring surface of the multi-cavity column is provided with a plurality of storage cavities that pass through from top to bottom, and the number of storage cavities is not less than three, and the exhaust pipe, monitor and air collection structure are respectively connected to different storage cavities.

[0008] Optionally, the air collecting structure includes a connecting cross frame, two collecting cylinders and a power extraction tube structure, the connecting cross frame is slidably sleeved on the outer surfaces of the two collecting cylinders, and the connecting cross frame is installed on the outer surface of the detection cylinder.

[0009] The air extraction end of the power extraction pipe structure is connected and installed with the two collecting cylinders, the power extraction pipe structure is fixed to the connecting horizontal frame, and the air outlet end of the power extraction pipe structure is eccentrically installed through the bottom of the detection cylinder.

[0010] The connecting horizontal frame is equipped with a power control structure for controlling the relative up and down movement of the two collecting cylinders. The outer ring surface of the collecting cylinder is provided with a ventilation groove communicating with the interior.

[0011] Optionally, the power pipe extraction structure includes a double-ended bent pipe and a large cylinder, both ends of the double-ended bent pipe are bent upward, one end of the double-ended bent pipe is fixed to the lower end of one of the collecting cylinders, and the other end of the double-ended bent pipe slides through the bottom surface of the other collecting cylinder.

[0012] The connecting cross frame is fixedly sleeved on the outer surface of the large cylinder, and a thin tube is slidably passed through the bottom surface of the large cylinder. The outer diameter of the thin tube is smaller than the inner diameter of the large cylinder, and the lower end of the thin tube is connected and installed with a double-headed elbow.

[0013] The back of the large cylinder is connected to and equipped with an air pump, the other end of which eccentrically penetrates the bottom surface of the detection cylinder, and the air pumping end is flush with the bottom wall of the detection cylinder.

[0014] Optionally, the collecting cylinder is provided with an interlayer on its circumferential surface, a rotating drum is rotatably inserted inside the interlayer, the rotating drum is provided with through grooves corresponding to the air-permeable grooves on its circumferential surface, and a power transmission structure for controlling the rotation of the rotating drum is installed on the connecting cross frame.

[0015] Optionally, the power control structure includes a displacement gear that can be rotated by power, the displacement gear is rotatably connected to the connecting cross frame, and the two collecting barrels are fixed with displacement tooth plates on one side close to each other, and the two sides of the displacement gear are respectively engaged with the two displacement tooth plates.

[0016] Optionally, the power transmission structure includes a double-rod frame, a connecting cross frame is installed with a power telescopic rod for controlling the forward and backward movement of the double-rod frame, a rotating drum is located outside the collecting drum and a transmission gear is coaxially fixed at one end, the two transmission gears are engaged with a transmission tooth plate on one side away from each other, the two transmission tooth plates are respectively slidably connected to the two collecting drums, and the front end of the transmission tooth plate is slidably sleeved on the outer surface of the double-rod frame.

[0017] The left and right ends of the double-rod frame are both vertical rod-shaped structures.

[0018] Optionally, the collecting tube is vertically arranged, the two collecting tubes are distributed in a circular array around the axis of the displacement gear, the two collecting tubes are staggered up and down, and the collecting tube on the upper side of the two collecting tubes is slidably connected to the double-headed elbow.

[0019] Optionally, an air separator is slidably inserted into the upper collecting cylinder of the two collecting cylinders, the inner annular surface of the rotating cylinder matches the outer annular surface of the air separator, and the upper surface of the air separator is flush with the inner top wall of the other collecting cylinder.

[0020] A linkage rod is fixed at the lower end of the air separator, and the lower end of the linkage rod slides through the inner bottom wall of the corresponding collection tube. The linkage rod is located outside the corresponding collection tube and is fixed at one end to the outer surface of the other collection tube. The linkage rod and the air separator are sleeved on the outer surface of the double-headed elbow.

[0021] Optionally, a gravity pressure plate is slidably inserted into the interior of the storage cavity, and the gravity pressure plate is in sliding contact with the inner annular surface of the detection cylinder.

[0022] In summary, the present invention has the following beneficial technical effects:

[0023] 1. The present invention sets components such as a multi-cavity column and an air collecting structure, controls the length of the air collecting structure, and allows toxic gases within a corresponding height range to enter the air collecting structure and then be filled between the multi-cavity column and the detection tube, so that the monitor detects the toxic gas content within the corresponding height range. The detected toxic gas is discharged from the exhaust pipe, and the toxic gas in the air can be monitored continuously and in a timely manner.

[0024] 2. The present invention provides components such as a rotating drum, a through groove and a ventilation groove. When the rotating drum is controlled to rotate so that the through groove and the ventilation groove are connected, the gas in the environment can enter the interior of the collecting drum through the through groove and the ventilation groove. When the rotating drum is controlled to drive the through groove and the ventilation groove to be misaligned, the collecting drum is closed, so that when the vacuum pump is pumping air, the flow of air will no longer drive external air into the interior of the collecting drum, thereby reducing the change in gas density caused by the flow of air and increasing the accuracy of monitoring.

[0025] 3. The present invention sets components such as air-isolating plates and linkage rods. When controlling the relative movement of the two collecting tubes and changing the overall upper and lower lengths of the two collecting tubes, the air-isolating plates slide in the corresponding collecting tubes, so that the space in the corresponding collecting tube on the upper side of the air-isolating plates and the space in the other collecting tube form a vertical space that does not overlap. The overlapping parts of the two collecting tubes will not repeatedly collect the air within the corresponding height, thereby further improving the accuracy of monitoring.

[0026] 4. The present invention sets a gravity pressure plate. After the overall height of the two collecting cylinders is changed, the gas collected in the two collecting cylinders is filled into the corresponding storage chamber under the gravity pressure plate. According to different gas quantities, the gravity pressure plate is pushed upward to a corresponding height to limit the density of the gas filled in the storage chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0028] Figure 2 is a schematic top view of part of the structure in an embodiment of the present invention;

[0029] Figure 3 2 is a schematic structural diagram of the connection between the transmission gear plate and the double rod frame in an embodiment of the present invention;

[0030] Figure 4 2 is a schematic structural diagram of the connection between the collecting cylinder and the air baffle plate in an embodiment of the present invention;

[0031] Figure 5 is a schematic side view of part of the structure in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of the connection between the large tube and the thin tube in an embodiment of the present invention;

[0033] Figure 7 It is a partial structural schematic diagram of an embodiment of the present invention;

[0034] Figure 8 It is a schematic front view of part of the structure in an embodiment of the present invention;

[0035] Figure 9 Schematic diagram of the internal structure of the detection tube in an embodiment of the present invention.

[0036] Figure numerals: 1. Monitor; 2. Detection tube; 3. Multi-cavity column; 4. Air collecting structure; 41. Connecting cross frame; 42. Collecting tube; 421. Interlayer; 422. Through groove; 423. Rotating tube; 43. Power extraction tube structure; 431. Double-headed elbow; 432. Large tube; 433. Thin tube; 434. Air pump; 44. Power control structure; 441. Displacement gear; 442. Displacement tooth plate; 45. Breathable groove; 46. Power transmission structure; 461. Double-rod frame; 462. Transmission gear; 463. Transmission tooth plate; 47. Air baffle; 48. Linkage rod; 5. Exhaust pipe; 6. Storage chamber; 7. Gravity pressure plate. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1 - Figure 9 The present invention is described in further detail.

[0038] The embodiment of the present invention discloses a harmful gas monitoring system. Figure 1 - Figure 9 As shown, it includes a monitor 1 and a detection tube 2. The monitor 1 is eccentrically installed through the bottom surface of the detection tube 2. A retractable support frame is installed on the outside of the detection tube 2 to change the height of the detection tube 2 from the ground. The detection end of the monitor 1 is flush with the bottom of the detection tube 2. The monitor 1 detects harmful gases in the space inside the detection tube 2 and then sends them to the receiving instrument.

[0039] A multi-cavity column 3 that can be rotated by power is installed inside the detection cylinder 2. The outer ring surface of the multi-cavity column 3 is provided with multiple storage cavities 6 that pass through from top to bottom. The number of storage cavities 6 is not less than three. The detection cylinder 2 is installed with a first motor. The output end of the first motor passes through the detection cylinder 2 and is coaxially connected to the multi-cavity column 3. A bearing is installed between the output shaft of the first motor and the detection cylinder 2, which can control the intermittent rotation of the multi-cavity column 3. The range of each rotation of the multi-cavity column 3 is the angular range of a storage cavity 6.

[0040] A gravity pressure plate 7 is slidably inserted into the storage cavity 6 , and the gravity pressure plate 7 is in sliding contact with the inner annular surface of the detection tube 2 .

[0041] An air collecting structure 4 with variable length is vertically arranged on one side of the detection tube 2. The air collecting structure 4 can collect air within different height ranges by changing its length. The air collecting structure 4 is connected to the external environment, and external air can enter the air collecting structure 4. The air outlet end of the air collecting structure 4 is eccentrically installed through the bottom surface of the detection tube 2.

[0042] The air in the air collecting structure 4 can be filled into the detection tube 2. After the length of the air collecting structure 4 is changed, when the collected air is filled into the corresponding storage cavity 6, the gravity pressure plate 7 moves upward to different heights according to different gas amounts.

[0043] An exhaust pipe 5 is installed through the bottom surface of the detection tube 2. The exhaust pipe 5 is located between the air collecting structure 4 and the monitor 1. When the storage chamber 6 connected to the exhaust pipe 5 is connected, the internal gas is fully discharged from the storage chamber 6 under the pressure of the gravity pressure plate 7, so that there is no residue in the storage chamber 6. When new air is filled in again, it will not mix with the residual air.

[0044] The exhaust pipe 5 , the monitor 1 and the gas collecting structure 4 are respectively connected to different storage chambers 6 , and the exhaust pipe 5 can discharge the gas in the connected storage chamber 6 .

[0045] The air collecting structure 4 includes a connecting cross frame 41, two collecting tubes 42 and a power extraction tube structure 43. The connecting cross frame 41 is slidably sleeved on the outer surfaces of the two collecting tubes 42. The collecting tubes 42 move vertically relative to the connecting cross frame 41. The connecting cross frame 41 is installed on the outer surface of the detection tube 2.

[0046] The power extraction tube structure 43 is connected to the two collecting tubes 42 and fixed to the connecting cross frame 41. The power extraction tube structure 43 is eccentrically installed at the bottom of the detection tube 2 so that the power extraction tube structure 43 is connected to the corresponding storage chamber 6.

[0047] The connecting cross frame 41 is installed with a power control structure 44 that controls the relative up and down movement of the two collecting cylinders 42. The power control structure 44 can change the overall vertical height of the two collecting cylinders 42. The outer ring surface of the collecting cylinder 42 is provided with a ventilation groove 45 that is connected to the interior. The external gas enters the interior of the collecting cylinder 42 through the ventilation groove 45.

[0048] The powered pipe extraction structure 43 includes a double-ended curved pipe 431 and a large tube 432. Both ends of the double-ended curved pipe 431 are bent upward. One end of the double-ended curved pipe 431 is fixed to the lower end of one of the collecting tubes 42, and the other end of the double-ended curved pipe 431 slides through the bottom surface of the other collecting tube 42. When the two collecting tubes 42 move relative to each other, the double-ended curved pipe 431 moves in the corresponding collecting tube 42.

[0049] The collecting cylinder 42 is provided with an interlayer 421 on its circumferential surface, and a rotating cylinder 423 is rotatably inserted inside the interlayer 421. A through groove 422 corresponding to the air permeable groove 45 is provided on the circumferential surface of the rotating cylinder 423. The connecting cross frame 41 is provided with a power transmission structure 46 for controlling the rotation of the rotating cylinder 423. The through groove 422 has the same width as the air permeable groove 45, and the distance between two adjacent air permeable grooves 45 is greater than the width of the air permeable groove 45. When the rotating cylinder 423 rotates, the through groove 422 and the air permeable groove 45 can be misaligned, so that the rotating cylinder 423 can seal the inside of the collecting cylinder 42. When the gas inside the rotating cylinder 423 is drawn into the detection cylinder 2, it is ensured that the airflow will not drive the air in the collecting cylinder 42 into the detection cylinder 2, thereby ensuring the accuracy of the detection concentration.

[0050] The power transmission structure 46 includes a double rod frame 461, and the connecting cross frame 41 is equipped with a power telescopic rod for controlling the forward and backward movement of the double rod frame 461. The power telescopic rod is an electric telescopic rod or a hydraulic cylinder. The rotating drum 423 is located on the outside of the collecting drum 42 and is coaxially fixed with a transmission gear 462 at one end. The two transmission gears 462 are engaged with a transmission tooth plate 463 on one side away from each other. The two transmission tooth plates 463 are respectively slidably connected with the two collecting drums 42 in a one-to-one correspondence. The front end of the transmission tooth plate 463 is slidably sleeved on the outer surface of the double rod frame 461. When the power telescopic rod is extended and retracted, it drives the double rod frame 461 and the transmission tooth plate 463 to move forward and backward relative to the connecting cross frame 41. When the two collecting drums 42 move up and down, they can respectively drive the corresponding transmission tooth plates 463 to slide on the surface of the double rod frame 461.

[0051] Both left and right ends of the double-rod frame 461 are vertical rod-shaped structures. The transmission gear plate 463 cooperates with the rod-shaped structures of the double-rod frame 461 to limit the movement trajectory of the transmission gear plate 463.

[0052] The connecting cross frame 41 is fixedly sleeved on the outer surface of the large cylinder 432, and a thin tube 433 slides through the bottom surface of the large cylinder 432. The outer diameter of the thin tube 433 is smaller than the inner diameter of the large cylinder 432. The lower end of the thin tube 433 is connected and installed with the double-headed elbow 431. When the two collecting cylinders 42 move up and down, the thin tube 433 is driven to move up and down in the large cylinder 432, and the gas in the thin tube 433 can enter the large cylinder 432.

[0053] The power control structure 44 includes a displacement gear 441 that can be rotated by power. The connecting cross frame 41 is equipped with a second motor. The output end of the second motor is coaxially equipped with a worm through a coupling. The displacement gear 441 is coaxially equipped with a worm wheel. The worm and the worm cooperate to stably transmit power to the displacement gear 441. The displacement gear 441 is rotatably connected to the connecting cross frame 41. The two collecting barrels 42 are fixed with displacement tooth plates 442 on one side close to each other. The two sides of the displacement gear 441 are respectively engaged with the two displacement tooth plates 442, and the two displacement tooth plates 442 are driven to move synchronously and oppositely during the rotation of the displacement gear 441.

[0054] The collecting cylinder 42 is vertically arranged, and the two collecting cylinders 42 are distributed in a circular array around the axis of the displacement gear 441. The two collecting cylinders 42 are staggered up and down. The upper collecting cylinder 42 of the two collecting cylinders 42 is slidably connected to the double-headed elbow 431 to limit the up and down movement of the collecting cylinder 42.

[0055] An air pump 434 is installed on the back of the large cylinder 432. The other end of the air pump 434 eccentrically penetrates the bottom surface of the detection cylinder 2. The air pump 434 is flush with the bottom wall of the detection cylinder 2. The air pump 434 fills the gas in the large cylinder 432 into the detection cylinder 2.

[0056] After the power telescopic rod is misaligned between the ventilation groove 45 and the through groove 422, the vacuum pump 434 starts to work, filling the air in the collection tube 42 into the detection tube 2, and then the multi-cavity column 3 rotates, driving the newly filled air to move to the position of the monitor 1, and then the power telescopic rod controls the through groove 422 and the ventilation groove 45 to be connected, and the gas in the environment is collected again.

[0057] To achieve the contraction of the power telescopic rod to control the connection between the vent groove 45 and the through groove 422, so that air can enter the collecting tube 42, and then the power telescopic rod is extended to control the misalignment of the vent groove 45 and the through groove 422, and then the vacuum pump 434 is started and shut down once, and the first motor is started and shut down once, PLC sequential control or relay-contactor control circuit can be used.

[0058] An air-isolating plate 47 is slidably inserted into the upper collection tube 42 of the two collection tubes 42. The inner annular surface of the rotating cylinder 423 cooperates with the outer annular surface of the air-isolating plate 47. The upper surface of the air-isolating plate 47 is flush with the inner top wall of the other collection tube 42. When controlling the relative movement of the two collection tubes 42 and changing the overall upper and lower lengths of the two collection tubes 42, the air-isolating plate 47 slides in the corresponding collection tube 42, so that the space in the corresponding collection tube 42 on the upper side of the air-isolating plate 47 and the space in the other collection tube 42 form a vertical space that does not overlap. The space on the upper side of the air-isolating plate 47 and the air inside the other collection tube 42 form an overall vertical height space, and the overlapping parts of the two collection tubes 42 will not repeatedly collect the air within the corresponding height.

[0059] A linkage rod 48 is fixed to the lower end of the air-isolating plate 47. The lower end of the linkage rod 48 slides through the inner bottom wall of the corresponding collecting tube 42. The linkage rod 48 is located at one end outside the corresponding collecting tube 42 and is fixed to the outer surface of the other collecting tube 42. The linkage rod 48 drives the air-isolating plate 47 to move synchronously with the connected collecting tube 42. The linkage rod 48 and the air-isolating plate 47 are sleeved on the outer surface of the double-headed elbow 431.

[0060] The working principle is as follows: external gas enters the gas collecting structure 4, and then the gas collecting structure 4 fills the internal gas into the space between the multi-cavity column 3 and the detection tube 2. When the multi-cavity column 3 rotates, the gas is connected to the monitor 1 and the exhaust pipe 5 in turn. The monitor 1 detects the gas and then discharges it from the detection tube 2 through the exhaust pipe 5. The length of the gas collecting structure 4 is controlled so that the toxic gas within the corresponding height range can enter the gas collecting structure 4 and then be filled between the multi-cavity column 3 and the detection tube 2, so that the monitor 1 can detect the toxic gas content within the corresponding height range.

[0061] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A harmful gas monitoring system, comprising a monitor (1) and a detection tube (2), characterized in that: The monitor (1) is eccentrically installed through the bottom surface of the detection tube (2); the detection end of the monitor (1) is flush with the bottom of the detection tube (2); a multi-cavity column (3) that can be rotated by power is installed inside the detection tube (2); an air collecting structure (4) with a variable length is vertically provided on one side of the detection tube (2); the air collecting structure (4) is connected to the external environment; and the air outlet end of the air collecting structure (4) is eccentrically installed through the bottom surface of the detection tube (2); An exhaust pipe (5) is installed through the bottom surface of the detection cylinder (2), and the exhaust pipe (5) is located between the air collection structure (4) and the monitor (1).

2. A harmful gas monitoring system according to claim 1, characterized in that: The outer ring surface of the multi-cavity column (3) is provided with a plurality of storage cavities (6) that are connected vertically, and the number of the storage cavities (6) is not less than three. The exhaust pipe (5), the monitor (1) and the air collection structure (4) are respectively connected to different storage cavities (6).

3. A harmful gas monitoring system according to claim 1 or 2, characterized in that: The air collecting structure (4) comprises a connecting cross frame (41), two collecting cylinders (42) and a power extraction pipe structure (43); the connecting cross frame (41) is slidably sleeved on the outer surfaces of the two collecting cylinders (42); and the connecting cross frame (41) is installed on the outer surface of the detection cylinder (2); The power extraction pipe structure (43) is connected to the two collecting cylinders (42) and is installed at its extraction end. The power extraction pipe structure (43) is fixed to the connecting cross frame (41). The power extraction pipe structure (43) is eccentrically installed at the bottom of the detection cylinder (2). The connecting cross frame (41) is equipped with a power control structure (44) for controlling the relative up and down movement of the two collecting cylinders (42). The outer ring surface of the collecting cylinder (42) is provided with a ventilation groove (45) communicating with the interior.

4. A harmful gas monitoring system according to claim 3, characterized in that: The power pipe extraction structure (43) includes a double-ended curved pipe (431) and a large cylinder (432). Both ends of the double-ended curved pipe (431) are bent upwards. One end of the double-ended curved pipe (431) is fixed to the lower end of one of the collecting cylinders (42), and the other end of the double-ended curved pipe (431) slides through the bottom surface of the other collecting cylinder (42). The connecting cross frame (41) is fixedly sleeved on the outer surface of the large cylinder (432), and a thin tube (433) is slidably passed through the bottom surface of the large cylinder (432). The outer diameter of the thin tube (433) is smaller than the inner diameter of the large cylinder (432), and the lower end of the thin tube (433) is connected and installed with the double-headed elbow (431); The back of the large cylinder (432) is connected to a vacuum pump (434), the other end of which eccentrically penetrates the bottom surface of the detection cylinder (2), and the vacuum end of the vacuum pump (434) is flush with the inner bottom wall of the detection cylinder (2).

5. A harmful gas monitoring system according to claim 4, characterized in that: The collecting cylinder (42) is provided with an interlayer (421) on its circumferential surface, a rotating cylinder (423) is rotatably inserted inside the interlayer (421), a through groove (422) corresponding to the air-permeable groove (45) is provided on the circumferential surface of the rotating cylinder (423), and a power transmission structure (46) for controlling the rotation of the rotating cylinder (423) is installed on the connecting cross frame (41).

6. A harmful gas monitoring system according to claim 5, characterized in that: The power control structure (44) includes a displacement gear (441) that can be rotated by power. The displacement gear (441) is rotatably connected to the connecting cross frame (41). Displacement tooth plates (442) are fixed on the sides of the two collecting cylinders (42) that are close to each other. Both sides of the displacement gear (441) are respectively engaged with the two displacement tooth plates (442).

7. The harmful gas monitoring system according to claim 5, characterized in that: The power transmission structure (46) includes a double-rod frame (461), a power telescopic rod for controlling the forward and backward movement of the double-rod frame (461) is installed on the connecting cross frame (41), a transmission gear (462) is coaxially fixed to one end of the rotating cylinder (423) located outside the collecting cylinder (42), and the two transmission gears (462) are meshed with transmission tooth plates (463) on the sides away from each other. The two transmission tooth plates (463) are respectively and one-to-one correspondingly connected to the two collecting cylinders (42), and the front end of the transmission tooth plate (463) is slidably sleeved on the outer surface of the double-rod frame (461); Both left and right ends of the double-rod frame (461) are vertical rod-shaped structures.

8. The harmful gas monitoring system according to claim 6, characterized in that: The collecting cylinder (42) is vertically arranged, and the two collecting cylinders (42) are distributed in a circular array around the axis of the displacement gear (441). The two collecting cylinders (42) are staggered up and down, and the upper collecting cylinder (42) of the two collecting cylinders (42) is slidably connected to the double-headed elbow (431).

9. A harmful gas monitoring system according to claim 8, characterized in that: An air baffle (47) is slidably inserted into the upper collecting cylinder (42) of the two collecting cylinders (42), the inner annular surface of the rotating cylinder (423) matches the outer annular surface of the air baffle (47), and the upper surface of the air baffle (47) is flush with the inner top wall of the other collecting cylinder (42); A linkage rod (48) is fixed to the lower end of the air separator (47), and the lower end of the linkage rod (48) slides through the inner bottom wall of the corresponding collection tube (42). One end of the linkage rod (48) is located outside the corresponding collection tube (42) and is fixed to the outer surface of the other collection tube (42). The linkage rod (48) and the air separator (47) are sleeved on the outer surface of the double-headed elbow (431).

10. The harmful gas monitoring system according to claim 2, characterized in that: A gravity pressure plate (7) is slidably inserted into the interior of the storage cavity (6), and the gravity pressure plate (7) is in sliding contact with the inner annular surface of the detection cylinder (2).

Images