Chemical workshop gas concentration detection device and method

Abstract

The invention belongs to the technical field of concentration detection, particularly relates to a chemical workshop gas concentration detection device and a chemical workshop gas concentration detection method, and provides the following scheme aiming at the problem that when chemical workshop gas is detected, the flow speed is slow, so that the gas stays in a pipeline for a long time, and detection data is lagged and distorted, the chemical workshop gas concentration detection device comprises a control box, and a cabinet door is arranged at the front end of the control box; the display is fixedly connected to the front end of the cabinet door; the exhaust pipe is arranged in the control box, a round hole is formed in one side of the control box, and the outer side of the exhaust pipe is fixedly connected to the interior of the round hole; the connecting pipe is arranged in the control box, and the bottom end of the connecting pipe communicates with the outer side of the exhaust pipe; and the plurality of detection sensors are located in the control box. The chemical workshop gas concentration detection device and method disclosed by the invention have the effects of increasing the flow rate, enabling gas to quickly flow through the sensor, reducing mixed interference, enabling detection data to reflect the concentration in real time, quickly capturing leaked high concentration and avoiding hysteresis distortion.

Description

Technical Field

[0001] The present invention relates to the technical field of gas concentration detection, and in particular to a gas concentration detection device and method for a chemical workshop. Background Art

[0002] The chemical workshop gas concentration detection device is a device used to detect gas concentration in the environment. It is mainly used to ensure the safe operation of chemical workshops and the safety of employees. It can monitor the concentration of flammable or toxic gases in the air in real time and issue an alarm when the concentration exceeds the standard.

[0003] When existing devices are used to detect gas concentration in chemical workshops, if the flow rate is too slow, the gas will stay in the pipeline for a longer time, and it is easy to mix and interfere with the residual gas in the pipeline, making it difficult for the detection data to reflect the actual concentration of the chemical workshop in a timely manner, and difficult to quickly capture the instantaneous high concentration of gas at the leakage point. Due to gas diffusion and mixing, the detection value will be delayed and distorted. Summary of the Invention

[0004] The present invention discloses a device and method for detecting gas concentration in a chemical workshop, aiming to solve the technical problem in the prior art that, when detecting gas in a chemical workshop, the slow flow rate causes the gas to stay in the pipeline for a long time, resulting in large mixing interference, causing delayed and distorted detection data, and making it difficult to timely capture leaked high-concentration gas.

[0005] The present invention proposes a gas concentration detection device for a chemical workshop, comprising: A control box, the front end of which is provided with a cabinet door; A display, fixedly connected to the front end of the cabinet door; The exhaust pipe is arranged inside the control box. A circular hole is opened on one side of the control box, and the outer side of the exhaust pipe is fixedly connected to the inside of the circular hole. A connecting pipe is provided inside the control box, and a bottom end of the connecting pipe is connected to the outside of the exhaust pipe; Multiple detection sensors are located inside the control box, and the inner sides of the detection sensors are fixedly connected to the outer sides of the connecting pipes; Multiple one-way valves are located above the detection sensor, and the inner sides of the one-way valves are fixedly connected to the outer sides of the connecting pipes; The air guide tube is located inside the control box, the bottom end of the air guide tube is fixedly connected to the top end of the connecting pipe, the top end of the control box is provided with a through hole, and the outer side of the air guide tube is fixedly connected to the inner side of the through hole; An expandable and contractible air inlet assembly is provided at one end of the air duct away from the control box, and is used to reduce the area of ​​the air inlet to increase the air flow rate; The airway anti-blocking cleaning component is located above the control box and is used to clean impurities in the airflow.

[0006] In a preferred embodiment, the expandable and contractible air port assembly comprises: The air inlet is located at the end of the air duct away from the control box; Multiple pull ropes, all located outside the air intake; Multiple fixed rope members are all located outside the air inlet, and the pulling ropes are all located inside the fixed rope members; A plurality of arc-shaped expansion plates are all located inside the front end of the air intake.

[0007] In a preferred embodiment, the expandable and contractible air port assembly further comprises: An annular frame, fixedly connected to the outer side of the air inlet; Multiple drive motors are fixedly connected to the inner wall of the annular frame, and the power output shafts of the drive motors are connected to the rotating shafts through couplings, and the outer side of the rotating shaft is wound and fixed to one end of the pulling rope; A plurality of auxiliary rollers are located outside the front end of the air inlet, and the outer sides of the auxiliary rollers are in contact with the outer sides of the pulling rope; The annular fixing piece is fixedly connected to the outer side of the air inlet, and the inner side of the annular connecting piece is fixedly connected to the outer side of the fixing rope piece.

[0008] In a preferred solution, the outer side of the air intake port is fixedly connected with a plurality of fixing parts, the fixing parts are all located inside the annular frame, the top ends of the fixing parts are movably connected to the bottom end of the rotating shaft, the outer side of the front end of the air intake port is fixedly connected with a plurality of symmetrical connecting plates, the opposite sides of the symmetrical connecting plates are fixedly connected with fixing rods, and the outer sides of the fixed rods are movably connected with auxiliary rollers, the inner wall of the front end of the air intake port is fixedly connected with an annular fixing part, the opposite side of the annular fixing part is fixedly connected with a connecting rod, the outer side of the connecting rod is movably connected with a movable part, the front side of the movable part is fixedly connected to the end of the pull rope away from the rotating shaft, and the opposite sides of the movable part are fixedly connected to the side opposite to the arc expansion plate.

[0009] In a preferred embodiment, the airway anti-blocking cleaning component includes: The bottom plate is fixedly connected to the top of the control box; A servo motor is fixedly connected to the top of the base plate, and a power output shaft of the servo motor is connected to a rotating gear through a coupling; A movable shaft, movably connected to the outside of the airway tube; The gear ring is fixedly connected to the outer side of the movable shaft, and the gear ring is meshed with the rotating gear through the tooth groove.

[0010] In a preferred embodiment, the airway anti-blocking cleaning component further comprises: The dust collecting head is located inside the movable shaft; The filter plate is fixedly connected to the inner wall of the air duct, and the dust collector is located above the filter plate; The winding shaft is fixedly connected to the outer side of the air guide tube and is located below the movable shaft.

[0011] In a preferred solution, a suction pipe is fixedly connected to one side of the vacuum cleaner head, a hole is provided on the outside of the movable shaft, the outside of the suction pipe is fixedly connected to the inside of the hole, and the suction pipe is wound around the outside of the winding shaft, the top of the control box is fixedly connected to a dust collecting box, a dust pump is installed on the side of the dust collecting box close to the suction pipe, and the dust suction end of the dust pump is fixedly connected to the end of the suction pipe away from the vacuum cleaner head.

[0012] In a preferred solution, the front end of the cabinet door is fixedly connected to a plurality of buttons, which are located below the display; the front end of the cabinet door is fixedly connected to a control valve, which is located between the buttons; and the top of the control box is fixedly connected to a warning light; a buzzer is fixedly connected to the side of the control box close to the expandable and contractible air port assembly; the outside of the exhaust pipe is fixedly connected to a plurality of fixed pipe fittings, the bottom ends of the fixed pipe fittings are all fixedly connected to the bottom inner wall of the control box, and an air pump is installed at the end of the air duct away from the control box, and the air inlet end of the air pump is fixedly connected to the end of the air duct close to the air port.

[0013] A method for using a gas concentration detection device in a chemical workshop, using the gas concentration detection device in a chemical workshop as described above, comprises the following steps: Step 1: When testing the gas concentration in a chemical workshop, the suction pump is started and gas enters from the suction port. At this time, the driving motor drives the rotating shaft to rotate, and the pulling rope then pulls the movable part, causing the arc-shaped expansion plate to adjust its position, reducing the front end area of ​​the suction port, thereby reducing the flow area and increasing the air flow velocity, and high-speed airflow enters the air guide pipe; Step 2: After the high-speed airflow enters the air duct, the impurities in the airflow are intercepted by the filter plate. The servo motor drives the rotating gear to rotate, and the tooth groove engagement drives the gear ring and the movable shaft to rotate. At the same time, the dust suction pump starts, and the impurities adsorbed on the filter plate are extracted to the suction pipe through the dust suction head and then enter the dust collection box, completing the airflow cleaning; Step 3: The cleaned gas enters the connecting pipe, the one-way valve controls the direction of the airflow, and multiple detection sensors detect the gas concentration. The detection data is transmitted to the display. If the concentration is too high, the buzzer sounds and the warning light lights up. Finally, the detected gas is discharged from the control box through the exhaust pipe.

[0014] From the above, it can be seen that the gas concentration detection device for a chemical workshop provided by the present invention has the effect of increasing the flow rate, allowing the gas to flow through the sensor quickly, reducing mixing interference, making the detection data reflect the concentration in real time, quickly capturing high leakage concentrations, and avoiding lag distortion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a schematic diagram of the overall structure of a gas concentration detection device for a chemical workshop proposed by the present invention; Figure 2 This is a schematic diagram of the internal structure of a control box of a chemical workshop gas concentration detection device proposed by the present invention; Figure 3 This is a schematic structural diagram of the connecting pipe portion of a gas concentration detection device for a chemical workshop proposed by the present invention; Figure 4 This is a schematic structural diagram of the gas guide pipe portion of a gas concentration detection device for a chemical workshop proposed by the present invention; Figure 5 This is a schematic structural diagram of an expandable and contractible gas port assembly of a gas concentration detection device for a chemical workshop proposed by the present invention; Figure 6 This is a partial structural diagram of an expandable and contractible gas port component of a gas concentration detection device for a chemical workshop proposed by the present invention; Figure 7 This is a schematic structural diagram of an airway anti-blocking and cleaning component of a gas concentration detection device for a chemical workshop proposed by the present invention; Figure 8 This is a partial structural schematic diagram of the airway anti-blocking and cleaning component of a chemical workshop gas concentration detection device proposed by the present invention.

[0016] Figure 1: Control box; 2: Cabinet door; 3: Button; 4: Control valve; 5: Display; 6: Exhaust pipe; 7: Warning light; 8: Suction pump; 9: Air duct; 10: Connecting pipe; 11: Airway anti-blocking cleaning assembly; 1101: Bottom plate; 1102: Servo motor; 1103: Rotating gear; 1104: Gear ring; 1105: Movable shaft; 1106: Suction tube; 1107: Winding shaft; 1108: Cleaning head; 1109: Filter plate; 1110: Cleaning pump; 1111: Dust box; 12: Buzzer ; 13. Fixed pipe fittings; 14. Detection sensor; 15. Expandable and retractable air port assembly; 1501. Air inlet; 1502. Ring frame; 1503. Fixed rope; 1504. Ring connecting piece; 1505. Pull rope; 1506. Fixed rod; 1507. Connecting plate; 1508. Ring fixing piece; 1509. Arc-shaped expansion plate; 1510. Retaining piece; 1511. Rotating shaft; 1512. Driving motor; 1513. Connecting rod; 1514. Movable part; 1515. Auxiliary roller; 16. One-way valve. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] The present invention discloses a chemical workshop gas concentration detection device mainly used for detecting chemical workshop gas using existing devices. The slow flow rate will cause the gas to stay in the pipeline for a long time and cause large mixing interference, resulting in delayed and distorted detection data, making it difficult to capture the scene of high-concentration gas leakage in a timely manner.

[0019] Reference Figures 1-8 , a gas concentration detection device for a chemical workshop, comprising: A control box 1, the front end of which is provided with a cabinet door 2; The display 5 is fixedly connected to the front end of the cabinet door 2; The exhaust pipe 6 is arranged inside the control box 1. A circular hole is opened on one side of the control box 1. The outer side of the exhaust pipe 6 is fixedly connected to the inside of the circular hole. The connecting pipe 10 is provided inside the control box 1, and the bottom end of the connecting pipe 10 is connected to the outside of the exhaust pipe 6; Multiple detection sensors 14 are located inside the control box 1, and the inner sides of the detection sensors 14 are fixedly connected to the outer sides of the connecting pipe 10; Multiple one-way valves 16 are located above the detection sensor 14, and the inner sides of the one-way valves 16 are fixedly connected to the outer sides of the connecting pipes 10; The air guide tube 9 is located inside the control box 1. The bottom end of the air guide tube 9 is fixedly connected to the top end of the connecting tube 10. The top end of the control box 1 is provided with a through hole. The outer side of the air guide tube 9 is fixedly connected to the inner side of the through hole. The expandable and contractible air inlet assembly 15 is provided at the end of the air duct 9 away from the control box 1. The expandable and contractible air inlet assembly 15 is used to reduce the area of ​​the air inlet 1501 to increase the air flow rate; The airway anti-blocking cleaning component 11 is located above the control box 1 and is used to clean impurities in the airflow.

[0020] Reference Figures 1-6 In a preferred embodiment, the expandable and contractible air port assembly 15 includes: The air inlet 1501 is located at the end of the air duct 9 away from the control box 1; Multiple pulling ropes 1505 are located outside the air inlet 1501; Multiple fixed ropes 1503 are located outside the air inlet 1501, and the pulling ropes 1505 are located inside the fixed ropes 1503; Multiple arc-shaped expansion plates 1509 are all located inside the front end of the air inlet 1501.

[0021] In the present invention, the expandable and contractible air port assembly 15 further includes: The annular frame 1502 is fixedly connected to the outer side of the air inlet 1501; Multiple drive motors 1512 are fixedly connected to the inner wall of the annular frame 1502. The power output shafts of the drive motors 1512 are connected to the rotating shaft 1511 through a coupling. The outer side of the rotating shaft 1511 is wound and fixed to one end of the pulling rope 1505. A plurality of auxiliary rollers 1515 are located outside the front end of the air inlet 1501, and the outer sides of the auxiliary rollers 1515 are in contact with the outer sides of the pulling rope 1505; The annular fixing member 1508 is fixedly connected to the outer side of the air inlet 1501 , and the inner side of the annular connecting member 1504 is fixedly connected to the outer side of the fixing rope 1503 .

[0022] In the present invention, the outside of the air inlet 1501 is fixedly connected with a plurality of retaining members 1510, the retaining members 1510 are all located inside the annular frame 1502, the tops of the retaining members 1510 are movably connected to the bottom ends of the rotating shafts 1511, the outside of the front end of the air inlet 1501 is fixedly connected with a plurality of symmetrical connecting plates 1507, the opposite sides of the symmetrical connecting plates 1507 are fixedly connected with fixing rods 1506, and the outsides of the fixing rods 1506 are movably connected with The auxiliary roller 1515 and the front inner wall of the air intake 1501 are fixedly connected with an annular fixing part 1508, and the opposite side of the annular fixing part 1508 is fixedly connected with a connecting rod 1513, and the outer side of the connecting rod 1513 is movably connected with a movable part 1514, and the front side of the movable part 1514 is fixedly connected to the end of the pulling rope 1505 away from the rotating shaft 1511, and the opposite sides of the movable part 1514 are fixedly connected to the opposite side of the arc expansion plate 1509.

[0023] In a specific application scenario, when it is necessary to reduce the front end area of ​​the air inlet 1501 to increase the air flow rate, the driving motor 1512 on the inner wall of the annular frame 1502 is started, driving the rotating shaft 1511 to rotate. When the rotating shaft 1511 rotates, the pulling rope 1505 begins to be wound. The pulling rope 1505 moves under the winding action of the rotating shaft 1511 and passes through the inside of the fixed rope member 1503 (the inner side of the fixed rope member 1503 is fixed to the annular connecting member 1504, and the annular connecting member 1504 cooperates with the annular fixing member 1508 on the outer side of the air inlet 1501 to limit the fixed rope member 1503 and ensure the movement trajectory of the pulling rope 1505). At the same time, the symmetrical connecting plate 1508 on the outer side of the front end of the air inlet 1501 is connected to the The auxiliary roller 1515 on the outside of the fixed rod 1506 between 07 contacts the outside of the pulling rope 1505, providing guidance for the movement of the pulling rope 1505, reducing friction, and helping the pulling rope 1505 to move smoothly. As the pulling rope 1505 is wound and pulled, the movable part 1514 is subjected to tension and moves along the connecting rod 1513 toward the center of the air intake 1501. Because the opposite side of the movable part 1514 is fixedly connected to the opposite side of the arc expansion plate 1509, the movement of the movable part 1514 drives the arc expansion plate 1509 to synchronously gather toward the center of the air intake 1501. Multiple arc expansion plates 1509 cooperate with each other to reduce the flow area at the front end of the air intake 1501, thereby achieving the function of increasing the airflow rate.

[0024] Specifically, the flow rate is increased to allow the gas to flow quickly through the detection sensor 14, reducing the interference of gas mixing in the pipeline, so that the detection data can reflect the actual concentration of the chemical workshop in real time, and can quickly capture the instantaneous high concentration of gas at the leakage point, avoiding the lag or distortion of the detection value due to slow flow rate and gas diffusion and mixing.

[0025] It should be noted that the gas generation and diffusion rates are different in different areas and different process links of a chemical workshop. By adjusting the flow rate, it can adapt to high and low concentration gas detection scenarios. Whether it is low-concentration monitoring of slow leaks or rapid capture of high-concentration sudden leaks, the detection conditions can be optimized.

[0026] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 and Figure 8 In a preferred embodiment, the airway anti-blocking cleaning component 11 includes: Bottom plate 1101, fixedly connected to the top of the control box 1; The servo motor 1102 is fixedly connected to the top of the base plate 1101, and the power output shaft of the servo motor 1102 is connected to the rotating gear 1103 through a coupling; A movable shaft 1105 is movably connected to the outer side of the air guide tube 9; The gear ring 1104 is fixedly connected to the outer side of the movable shaft 1105 , and the gear ring 1104 is meshed with the rotating gear 1103 through teeth and grooves.

[0027] In the present invention, the airway anti-blocking cleaning component 11 further includes: The dust collecting head 1108 is located inside the movable shaft 1105; The filter plate 1109 is fixedly connected to the inner wall of the air guide tube 9, and the dust collector head 1108 is located above the filter plate 1109; The winding shaft 1107 is fixedly connected to the outside of the air guide tube 9 and is located below the movable shaft 1105 .

[0028] In the present invention, a suction pipe 1106 is fixedly connected to one side of the dust collector head 1108, a hole is opened on the outside of the movable shaft 1105, the outside of the suction pipe 1106 is fixedly connected to the inside of the hole, and the suction pipe 1106 is wound around the outside of the winding shaft 1107, and the top of the control box 1 is fixedly connected to the dust collecting box 1111, and a dust collecting pump 1110 is installed on the side of the dust collecting box 1111 close to the suction pipe 1106, and the dust collecting end of the dust collecting pump 1110 is fixedly connected to the end of the suction pipe 1106 away from the dust collector head 1108.

[0029] In a specific application scenario, after the airflow enters the air duct 9, since the filter plate 1109 is fixed to the inner wall of the movable shaft 1105, the airflow needs to pass through the filter plate 1109 to continue to flow. Solid impurities (such as dust, particulate matter, etc.) in the airflow cannot pass through the pores of the filter plate 1109. At this time, the servo motor 1102 fixed to the bottom plate 1101 is started, driving the rotating gear 1103 to rotate. Since the gear ring 1104 is fixed to the outside of the movable shaft 1105 and meshes with the rotating gear 1103 through the tooth groove, the rotation of the rotating gear 1103 will drive the gear ring 1104, and then drive the movable shaft 1105 to perform circumferential rotation along the outside of the air duct 9. In this process, the winding shaft 1107 is fixed to the outside of the air duct 9, providing basic support for the orderly retraction and extension of the subsequent suction pipe 1106. At the same time, the rotation of the movable shaft 1105 keeps the dust collector head 1108 in a dynamic working state, which can be In order to avoid excessive accumulation of impurities in a local area and ensure the stability of the interception effect, the dust suction pump 1110 on the side of the dust collection box 1111 is started, and a negative pressure environment is formed inside it. Because the dust collection head 1108 is located inside the movable shaft 1105 and above the filter plate 1109, one end of the suction pipe 1106 is connected to the dust collection head 1108 and the other end is connected to the dust collection end of the dust collection pump 1110, and the suction pipe 1106 is wound around the outside of the winding shaft 1107 (when the movable shaft 1105 rotates, the winding shaft 1107 cooperates to realize the orderly retraction and release of the suction pipe 1106 to avoid entanglement and knotting). The negative pressure is transmitted to the vicinity of the filter plate 1109 through the suction pipe 1106 and the dust collection head 1108. The impurities intercepted by the filter plate 1109 are separated from the surface of the filter plate 1109 under the action of negative pressure adsorption, enter the suction pipe 1106 through the dust collection head 1108, and are finally transported to the dust collection box 1111 for storage, completing the separation and collection of impurities from the air flow.

[0030] Specifically, intercepting impurities can prevent them from adhering to the surface of the detection sensor 14 or mixing with the gas to affect detection, allowing the sensor to accurately capture the gas composition and concentration. When the chemical workshop contains dust, failure to intercept will cause the sensor to misjudge and affect the monitoring of hazardous gases.

[0031] It should be noted that if the intercepted impurities are not cleaned, they will accumulate in the air duct 9, connecting pipe 10, etc., reducing the pipeline diameter or even clogging it. Adsorption and cleaning can ensure smooth airflow and avoid system failure and shutdown due to pipeline problems.

[0032] Reference Figure 1-Figure 5In a preferred embodiment, a plurality of buttons 3 are fixedly connected to the front end of the cabinet door 2, and the buttons 3 are located below the display 5. A control valve 4 is fixedly connected to the front end of the cabinet door 2, and the control valve 4 is located between the buttons 3. A warning light 7 is fixedly connected to the top of the control box 1. A buzzer 12 is fixedly connected to the side of the control box 1 close to the expandable and retractable air port assembly 15. A plurality of fixed pipes 13 are fixedly connected to the outside of the exhaust pipe 6. The bottom ends of the fixed pipes 13 are all fixedly connected to the inner wall of the bottom end of the control box 1, and an air pump 8 is installed at the end of the air guide pipe 9 away from the control box 1, and the air inlet end of the air pump 8 is fixedly connected to the air inlet 1501 at the end of the air guide pipe 9 close to the air guide pipe 9.

[0033] A method for using a gas concentration detection device in a chemical workshop, using the gas concentration detection device in a chemical workshop as described above, comprises the following steps: Step 1: When testing the gas concentration in a chemical workshop, the suction pump 8 is started, and gas enters from the suction port 1501. At this time, the driving motor 1512 drives the rotating shaft 1511 to rotate, and the pulling rope 1505 then pulls the movable member 1514, causing the arc-shaped expansion plate 1509 to adjust its position, reducing the front end area of ​​the suction port 1501, thereby reducing the flow area and increasing the air flow velocity, and the high-speed air flow enters the air guide pipe 9; Step 2: After the high-speed airflow enters the air guide duct 9, impurities in the airflow are intercepted by the filter plate 1109. The servo motor 1102 drives the rotating gear 1103 to rotate, which drives the gear ring 1104 and the movable shaft 1105 to rotate through the tooth and groove engagement. At the same time, the dust suction pump 1110 is started, and the impurities adsorbed on the filter plate 1109 are extracted to the suction pipe 1106 through the dust collection head 1108 and then enter the dust collection box 1111, completing the airflow cleaning; Step 3: The cleaned gas enters the connecting pipe 10, the one-way valve 16 controls the direction of the airflow, and multiple detection sensors 14 detect the gas concentration. The detection data is transmitted to the display 5 for display. If the concentration is too high, the buzzer 12 sounds and the warning light 7 lights up to alarm. Finally, the detected gas is discharged from the control box 1 through the exhaust pipe 6.

[0034] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A gas concentration detection device for a chemical workshop, characterized in that: include: A control box, the front end of which is provided with a cabinet door; A display, fixedly connected to the front end of the cabinet door; The exhaust pipe is arranged inside the control box. A circular hole is opened on one side of the control box, and the outer side of the exhaust pipe is fixedly connected to the inside of the circular hole. A connecting pipe is provided inside the control box, and a bottom end of the connecting pipe is connected to the outside of the exhaust pipe; Multiple detection sensors are located inside the control box, and the inner sides of the detection sensors are fixedly connected to the outer sides of the connecting pipes; Multiple one-way valves are located above the detection sensor, and the inner sides of the one-way valves are fixedly connected to the outer sides of the connecting pipes; The air guide tube is located inside the control box, the bottom end of the air guide tube is fixedly connected to the top end of the connecting pipe, the top end of the control box is provided with a through hole, and the outer side of the air guide tube is fixedly connected to the inner side of the through hole; An expandable and contractible air inlet assembly is provided at one end of the air duct away from the control box, and is used to reduce the area of ​​the air inlet to increase the air flow rate; The airway anti-blocking cleaning component is located above the control box and is used to clean impurities in the airflow.

2. A chemical workshop gas concentration detection device according to claim 1, characterized in that: The expandable and contractible gas port assembly comprises: The air inlet is located at the end of the air duct away from the control box; Multiple pull ropes, all located outside the air intake; Multiple fixed rope members are all located outside the air inlet, and the pulling ropes are all located inside the fixed rope members; A plurality of arc-shaped expansion plates are all located inside the front end of the air intake.

3. A chemical workshop gas concentration detection device according to claim 2, characterized in that: The expandable and contractible gas port assembly further comprises: An annular frame, fixedly connected to the outer side of the air inlet; Multiple drive motors are fixedly connected to the inner wall of the annular frame, and the power output shafts of the drive motors are connected to the rotating shafts through couplings, and the outer side of the rotating shaft is wound and fixed to one end of the pulling rope; A plurality of auxiliary rollers are located outside the front end of the air inlet, and the outer sides of the auxiliary rollers are in contact with the outer sides of the pulling rope; The annular fixing piece is fixedly connected to the outer side of the air inlet, and the inner side of the annular connecting piece is fixedly connected to the outer side of the fixing rope piece.

4. A chemical workshop gas concentration detection device according to claim 3, characterized in that: The outside of the air intake port is fixedly connected with a plurality of fixing parts, the fixing parts are all located inside the annular frame, the top of the fixing parts are movably connected to the bottom end of the rotating shaft, the outside of the front end of the air intake port is fixedly connected with a plurality of symmetrical connecting plates, the opposite sides of the symmetrical connecting plates are fixedly connected with fixing rods, and the outsides of the fixed rods are movably connected with auxiliary rollers, the front inner wall of the air intake port is fixedly connected with an annular fixing part, the opposite side of the annular fixing part is fixedly connected with the connecting rod, the outside of the connecting rod is movably connected with a movable part, the front side of the movable part is fixedly connected to the end of the pull rope away from the rotating shaft, and the opposite sides of the movable part are fixedly connected to the side opposite to the arc expansion plate.

5. A chemical workshop gas concentration detection device according to claim 4, characterized in that: The airway anti-blocking cleaning component includes: The bottom plate is fixedly connected to the top of the control box; A servo motor is fixedly connected to the top of the base plate, and a power output shaft of the servo motor is connected to a rotating gear through a coupling; A movable shaft, movably connected to the outside of the airway tube; The gear ring is fixedly connected to the outer side of the movable shaft, and the gear ring is meshed with the rotating gear through the tooth groove.

6. A chemical workshop gas concentration detection device according to claim 5, characterized in that: The airway anti-blocking cleaning component also includes: The dust collecting head is located inside the movable shaft; The filter plate is fixedly connected to the inner wall of the air duct, and the dust collector is located above the filter plate; The winding shaft is fixedly connected to the outer side of the air guide tube and is located below the movable shaft.

7. A chemical workshop gas concentration detection device according to claim 6, characterized in that: A suction pipe is fixedly connected to one side of the dust collector head, a hole is opened on the outside of the movable shaft, the outside of the suction pipe is fixedly connected to the inside of the hole, and the suction pipe is wound around the outside of the winding shaft. A dust collecting box is fixedly connected to the top of the control box, and a dust pump is installed on the side of the dust collecting box close to the suction pipe. The dust suction end of the dust pump is fixedly connected to the end of the suction pipe away from the dust collector head.

8. A chemical workshop gas concentration detection device according to claim 7, characterized in that: The front end of the cabinet door is fixedly connected to a plurality of buttons, which are located below the display. The front end of the cabinet door is fixedly connected to a control valve, which is located between the buttons. A warning light is fixedly connected to the top of the control box, and a buzzer is fixedly connected to the side of the control box close to the expandable and retractable air port assembly.

9. A chemical workshop gas concentration detection device according to claim 8, characterized in that: The outside of the exhaust pipe is fixedly connected to a plurality of fixed pipe fittings, the bottom ends of the fixed pipe fittings are fixedly connected to the inner wall of the bottom end of the control box, and an air suction pump is installed at the end of the air guide pipe away from the control box, and the air inlet end of the air suction pump is fixedly connected to the end of the air guide pipe close to the air intake.

10. A method for using a gas concentration detection device in a chemical workshop, using the gas concentration detection device in a chemical workshop according to claim 9, characterized in that: The steps include: Step 1: When testing the gas concentration in a chemical workshop, the suction pump is started and gas enters from the suction port. At this time, the driving motor drives the rotating shaft to rotate, and the pulling rope then pulls the movable part, causing the arc-shaped expansion plate to adjust its position, reducing the front end area of ​​the suction port, thereby reducing the flow area and increasing the air flow velocity, and high-speed airflow enters the air guide pipe; Step 2: After the high-speed airflow enters the air duct, the impurities in the airflow are intercepted by the filter plate. The servo motor drives the rotating gear to rotate, and the tooth groove engagement drives the gear ring and the movable shaft to rotate. At the same time, the dust suction pump starts, and the impurities adsorbed on the filter plate are extracted to the suction pipe through the dust suction head and then enter the dust collection box, completing the airflow cleaning; Step 3: The cleaned gas enters the connecting pipe, the one-way valve controls the direction of the airflow, and multiple detection sensors detect the gas concentration. The detection data is transmitted to the display. If the concentration is too high, the buzzer sounds and the warning light lights up. Finally, the detected gas is discharged from the control box through the exhaust pipe.

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