Harmful gas concentration detection device for environmental monitoring

Abstract

The invention belongs to the technical field of gas detection, particularly relates to a harmful gas concentration detection device for environmental monitoring, and solves the problems of insufficient airflow control and insufficient detection precision in the prior art. The spiral air flow guide plate, the servo motor and other structures are arranged, the air flow guide plate is designed to be of a right-handed spiral structure, gas enters the barrel in a laminar flow state through a gradually-shrunk channel of the air flow guide plate, turbulence interference is effectively reduced, and the air flow guide effect is improved. The rotating circular plate drives the sliding straight block to move in the radial direction through the inner spiral limiting block, the organ moving block is driven to form a dynamic sealing cavity, sucked airflow is compressed to a detection area, the collision frequency of target gas molecules and the detection assembly is remarkably improved, and therefore the capturing capacity of the device for trace gas is enhanced.

Description

Technical Field

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

[0002] The harmful gas concentration detection device for environmental monitoring is a precision instrument used to monitor the concentration of specific harmful gases in the environment in real time. It is designed to ensure air quality safety and prevent health risks or safety accidents caused by gas leaks.

[0003] In the fields of industrial production, environmental monitoring and public safety, real-time detection of harmful gas concentrations is a key technology for preventing poisoning accidents, environmental pollution and explosion risks. Traditional harmful gas detection devices generally have the following technical bottlenecks, which make it difficult to meet the needs of precise monitoring in complex scenarios: Insufficient airflow control accuracy. Existing equipment mostly uses single-stage pumping or natural diffusion to sample, and the airflow stability is poor. For example, the pumping detector directly extracts air through a high-speed fan, which is prone to turbulence, resulting in uneven contact between gas molecules and the detection sensor, affecting the response speed and quantitative accuracy; the diffusion-type equipment is significantly affected by the ambient wind speed and temperature, and cannot actively control the sampling path. The detection sensitivity and anti-interference contradiction are in conflict. In order to improve sensitivity, some equipment uses membrane separation or chemical adsorption pretreatment, but it will extend the detection delay and is easily polluted by humidity and particulate matter, leading to sensor poisoning. Although the direct detection equipment has a fast response, it is easily affected by cross-gas interference in low-concentration scenarios and has a high false alarm rate. Summary of the Invention

[0004] The purpose of the invention is to provide a harmful gas concentration detection device for environmental monitoring, which solves the problems of insufficient airflow control and insufficient detection accuracy.

[0005] To achieve the above-mentioned purpose, the invention provides the following technical solution: a harmful gas concentration detection device for environmental monitoring, comprising a cylinder, one end of which is equipped with a negative pressure component for negative pressure suction, the other end of which is equipped with an airflow guiding component for airflow guidance, and the interior of the cylinder is equipped with an airflow compression component for airflow compression and a detection component for airflow detection arranged along the axis of the cylinder.

[0006] As a preferred solution of the present invention, a control panel and a battery module are respectively installed on the top of the cylinder, and two symmetrically arranged handles are fixedly connected to both sides of the cylinder by screws.

[0007] As a preferred solution of the present invention, the negative pressure component is composed of a negative pressure motor, the negative pressure motor is installed at one end of the cylinder, and a negative pressure fan is installed at the output end of the negative pressure motor.

[0008] As a preferred solution of the present invention, the airflow guide assembly includes a wind flow spiral guide plate, which is fixedly connected to one end of the cylinder, and one end of the wind flow spiral guide plate is provided with a protrusion, and one end of the protrusion is provided with a recess.

[0009] As a preferred solution of the present invention, the air flow compression assembly is composed of a servo motor, the output end of the servo motor is connected to a coaxially arranged transmission shaft through a coupling, a transmission gear is fixedly sleeved on the outer circumference of the transmission shaft, a rotating circular plate is rotatably installed inside the cylinder, an outer gear ring is fixedly connected to the outer circumference of the rotating circular plate, an inner spiral limit block is fixedly connected to one side of the rotating circular plate, and a plurality of sliding straight blocks evenly distributed around the circumference of the cylinder are slidingly assembled inside the cylinder, a limiting groove is provided inside the sliding straight block, the limiting groove and the inner spiral limit block are in contact with each other, one end of the sliding straight block is fixedly connected to a sliding block, and one side of every two sliding blocks is commonly fixedly connected to an accordion moving block.

[0010] As a preferred solution of the present invention, two symmetrically arranged transmission screws are installed for rotation inside the cylinder, and a follower gear is fixedly sleeved on the outer circumference of the transmission screw, and the two follower gears are engaged with the outer gear ring. A circular slider is commonly movably sleeved on the two transmission screws, and an elastic sealing sheet is commonly connected between the circular slider and the sliding block and the accordion moving block. A fixed circular plate is fixedly connected to the inside of the cylinder, and a circular accordion block is commonly connected between the fixed circular plate and the circular slider.

[0011] As a preferred solution of the present invention, the detection component is composed of a circular cylinder, which is fixedly connected to the inside of the cylinder body, a screw motor is installed inside the cylinder body, a rotating screw is installed at the output end of the screw motor, a sliding round block is movably sleeved on the outer circumference of the rotating screw, a plurality of circumferentially evenly distributed fixed connecting rods are fixedly connected to the inside of the cylinder body, one end of the plurality of fixed connecting rods is commonly fixedly connected to an inner groove shaft, one end of the inner groove shaft is fixedly connected to a joint, a plurality of circumferentially evenly distributed second hinged rods are movably hinged on the joint, a plurality of circumferentially evenly distributed first hinged rods are movably hinged on the sliding round block, and the first hinged rod and the second hinged rod are hinged to each other.

[0012] As a preferred solution of the present invention, several second hinged rods are commonly fixed with an elastic air guide plate, one end of the elastic air guide plate is commonly connected to the circular cylinder with a stretching plate, and several circumferentially evenly distributed detection heads are provided on the stretching plate, and through grooves are provided on both sides of the detection heads.

[0013] Compared with the prior art, the invention has the following beneficial effects:

[0014] 1. The present invention adopts the arrangement of spiral wind guide plates, servo motors and other structures. The wind guide plates adopt a right-handed spiral structure design. The gradually contracting channel allows the gas to enter the cylinder in a laminar state, effectively reducing turbulent interference. The rotating circular plate drives the sliding straight block to move radially through the inner spiral limit block, driving the accordion moving block to form a dynamic sealing cavity, compressing the inhaled airflow to the detection area, significantly increasing the collision frequency of the target gas molecules and the detection component, thereby enhancing the device's ability to capture trace gases.

[0015] 2. This invention utilizes an innovative design that integrates elastic air guides and stretchable sheets into a detection head, creating a multidimensional detection array. The elastic air guides utilize a stainless steel sheet and fluororubber composite structure, driven by an articulated rod to achieve periodic opening and closing motion, exposing the detection head to the core of the airflow. The porous PTFE membrane covering the detection head filters particulate matter, while the through-channel design creates an airflow convection effect. Combined with the control panel's intelligent algorithm compensation, this significantly improves the accuracy and response speed of multi-component gas concentration detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the invention;

[0017] Figure 2 It is a side view of the overall structure of the invention;

[0018] Figure 3 Schematic diagram of the internal structure of the cylinder of the invention;

[0019] Figure 4 A schematic diagram of the overall structure of the airflow guide assembly of the invention;

[0020] Figure 5 A schematic diagram of the overall structure of the air flow compression assembly of the invention;

[0021] Figure 6 Schematic diagram of the transmission structure of the sliding straight block of the invention;

[0022] Figure 7 A cross-sectional view of the circular cylinder of the invention;

[0023] Figure 8 Schematic diagram of the second articulated rod transmission structure of the invention.

[0024] In the figure: 1, cylinder; 11, control panel; 12, battery module; 13, handle;

[0025] 2. Negative pressure component; 21. Negative pressure motor; 22. Negative pressure fan;

[0026] 3. Airflow guide assembly; 31. Notch; 32. Protrusion; 33. Airflow spiral guide plate;

[0027] 4. Airflow compression assembly; 41. Servo motor; 411. Drive shaft; 412. Drive gear; 42. Rotating circular plate; 421. Outer ring gear; 422. Inner screw stopper; 43. Sliding straight block; 431. Sliding block; 432. Organ moving block; 44. Drive screw; 441. Follower gear; 442. Circular slider; 443. Elastic sealing sheet; 445. Circular organ block; 446. Fixed circular plate;

[0028] 5. Detection assembly; 51. Circular cylinder; 52. Screw motor; 521. Rotating screw; 523. Sliding round block; 531. First hinged rod; 54. Inner groove shaft; 541. Joint; 542. Second hinged rod; 543. Fixed connecting rod; 55. Elastic air guide plate; 551. Stretch plate; 552. Detection head. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] See also Figure 1-8 A harmful gas concentration detection device for environmental monitoring includes a cylinder 1, a negative pressure component 2 for negative pressure suction is installed at one end of the cylinder 1, an air flow guiding component 3 for air flow guidance is installed at the other end of the cylinder 1, and an air flow compression component 4 for air flow compression and a detection component 5 for air flow detection are installed inside the cylinder 1 along the axis of the cylinder 1.

[0031] Specifically, a harmful gas concentration detection device for environmental monitoring has a main body of a cylindrical barrel 1, with a negative pressure component 2 installed at one end of the barrel and an airflow guide component 3 at the other end. The inside of the barrel is arranged in sequence along the axis. The negative pressure component 2 drives the negative pressure fan 22 to rotate through the negative pressure motor 21, and uses centrifugal force to form a negative pressure environment in the barrel, so that the external gas is sucked in through the airflow guide component 3. The airflow guide component 3 adopts a spiral airflow guide plate 33, and its protrusion 32 and recess 31 are designed to optimize the airflow entry angle, so that the gas enters the barrel in a spiral shape and reduces turbulence. The airflow compression component 4 drives the transmission shaft 411 to rotate through the servo motor 41, and drives the rotating circular plate 42 to rotate through the transmission gear 412. The outer ring gear 421 of the rotating circular plate 42 engages with the follower gear 441 on the transmission screw 44, driving the circular slider 442 to move axially, and then drives the accordion moving block 432 to contract or expand radially through the elastic sealing plate 443 to achieve airflow compression. Inside the circular cylinder 51 of the detection component 5, the screw motor 52 drives the rotating screw 521 to rotate, causing the sliding round block 523 to move axially, and driving the elastic air guide plate 55 to deform through the hinge rods 531 and 542. The detection head 552 on the stretching plate 551 is exposed to the airflow as it deforms, completing the concentration detection.

[0032] In this embodiment, a control panel 11 and a battery module 12 are respectively installed on the top of the cylinder 1, and two symmetrically arranged handles 13 are fixedly connected to both sides of the cylinder 1 by screws.

[0033] Specifically, a control panel 11 and a battery module 12 are integrated on the top of the cylinder 1. The control panel 11 realizes parameter setting and data display through an embedded touch screen. The battery module 12 is powered by a detachable lithium battery pack. Two symmetrically arranged handles 13 are fixed on both sides of the cylinder by screws. The surface of the handles 13 is covered with a non-slip rubber layer, which is convenient for one-handed holding and operation. The negative pressure motor 21 of the negative pressure component 2 is installed at the end of the cylinder, and its output shaft is directly connected to the negative pressure fan 22. The fan blades adopt a backward curved design to improve the suction efficiency. The wind flow spiral guide plate 33 of the airflow guide component 3 is fixed to the end of the cylinder by welding. The protrusion 32 and the recess 31 form a tapered airflow channel, so that the inhaled gas enters the cylinder in a spiral shape. The servo motor 41 of the airflow compression component 4 is fixed to the inside of the cylinder by bolts, and the transmission shaft 411 and the rotating circular plate 42 are connected by a spline to ensure the stability of torque transmission. The circular cylinder 51 of the detection component 5 is arranged coaxially with the cylinder body, the screw motor 52 is fixed to the end of the cylinder body through a bracket, and the rotating screw 521 and the sliding round block 523 are matched with trapezoidal threads to achieve precise axial positioning.

[0034] In this embodiment, the negative pressure assembly 2 is composed of a negative pressure motor 21 . The negative pressure motor 21 is installed at one end of the cylinder 1 , and a negative pressure fan 22 is installed at the output end of the negative pressure motor 21 .

[0035] Specifically, the core of the negative pressure component 2 is the negative pressure motor 21, which adopts a brushless DC motor with a wide adjustable speed range. The negative pressure fan 22 is composed of aluminum alloy blades and nylon sleeves, and the surface of the blades is sprayed with an anti-corrosion coating. The motor mounting seat is connected to the cylinder 1 through a shock-absorbing rubber pad to reduce vibration transmission. The wind flow spiral guide plate 33 of the airflow guide component 3 is formed in one piece by 3D printing. The diameter of the protrusion 32 is 1 / 3 of the inner diameter of the cylinder, and the diameter of the recess 31 is consistent with the inner diameter of the cylinder, forming a Venturi effect to enhance the suction capacity. The servo motor 41 of the airflow compression component 4 drives the transmission shaft 411 to rotate, and the transmission gear 412 and the outer ring gear 421 are engaged with a transmission ratio of 3:1, so that the rotating circular plate 42 can achieve high torque output at a lower speed. The sliding straight block 43 forms a spiral transmission with the rotating circular plate 42 through the inner spiral limit block 422. The accordion moving block 432 is made of silicone material and moves with the sliding block 431 to achieve radial sealing. The elastic air guide piece 55 of the detection component 5 is made of a composite of stainless steel sheet and rubber, and the detection head 552 is connected to the stretching piece 551 through a spring contact to ensure contact reliability.

[0036] In this embodiment, the airflow guide assembly 3 includes a wind flow spiral guide plate 33, which is fixedly connected to one end of the cylinder 1. One end of the wind flow spiral guide plate 33 is provided with a protrusion 32, and one end of the protrusion 32 is provided with a recess 31.

[0037] Specifically, the airflow spiral guide plate 33 of the airflow guide assembly 3 is in the shape of a right-hand spiral with a pitch of 1 / 5 of the length of the cylinder 1. The transition between the protrusion 32 and the recess 31 adopts a rounded corner design to reduce airflow separation. The blade installation angle of the negative pressure fan 22 of the negative pressure assembly 2 is 30°, and when the motor speed is 3000rpm, it can generate a negative pressure of -5kPa. The gap between the outer diameter of the rotating circular plate 42 of the airflow compression assembly 4 and the inner diameter of the cylinder is controlled within 0.1mm. The module of the outer gear ring 421 is 1.5, forming a standard gear transmission with the follower gear 441. There are 6 sliding straight blocks 43, evenly distributed along the circumference, and the compression stroke of each accordion moving block 432 is 1 / 4 of the cylinder radius. The elastic air guide plate 55 of the detection assembly 5 covers 80% of the cross-sectional area of ​​the cylinder when unfolded. The stretching plate 551 is made of Kevlar fiber reinforced rubber, and the detection head 552 is installed at an angle of 15° along the airflow direction to improve detection sensitivity. The screw motor 52 drives the rotating screw 521 to rotate, so that the axial movement range of the sliding block 523 covers the entire detection area.

[0038] In this embodiment, the air flow compression component 4 is composed of a servo motor 41, and the output end of the servo motor 41 is connected to a coaxially arranged transmission shaft 411 through a coupling. A transmission gear 412 is fixedly sleeved on the outer circumference of the transmission shaft 411. A rotating circular plate 42 is rotatably installed inside the cylinder 1, and an outer gear ring 421 is fixedly connected to the outer circumference of the rotating circular plate 42. One side of the rotating circular plate 42 is fixedly connected to an inner spiral limit block 422. The interior of the cylinder 1 is slidingly assembled with a number of sliding straight blocks 43 evenly distributed around the circumference. A limiting groove is provided inside the sliding straight block 43, and the limiting groove and the inner spiral limit block 422 fit together. One end of the sliding straight block 43 is fixedly connected to a sliding block 431, and one side of every two sliding blocks 431 is fixedly connected to an organ moving block 432.

[0039] Specifically, the servo motor 41 of the airflow compression component 4 achieves precise speed control through a closed-loop control system, and a torque sensor is provided at the connection between the transmission shaft 411 and the rotating circular plate 42 to monitor the transmission status in real time. When the rotating circular plate 42 rotates, the inner spiral limit block 422 drives the sliding straight block 43 to move radially along the limit slide groove, and the sliding block 431 is connected to the circular slider 442 through the accordion moving block 432. The circular slider 442 and the transmission screw 44 form a ball screw pair, which converts the rotational motion into axial movement, and compresses the circular accordion block 445 to achieve airflow sealing. The elastic sealing sheet 443 adopts a bellows structure, which allows axial deformation while maintaining airtightness. The fixed circular plate 446 is welded and fixed to the cylinder 1, and an annular air guide groove is provided on it to ensure that the compressed airflow enters the detection area evenly. The hinged rods 531 and 542 of the detection component 5 are made of stainless steel with chrome-plated surface. The joint 541 is connected to the inner groove shaft 54 ​​through a deep groove ball bearing to achieve low-friction rotation. When the elastic air guide piece 55 is deformed, the detection head 552 moves along the stretching piece 551 to cover the entire air flow cross section.

[0040] In this embodiment, two symmetrically arranged transmission screws 44 are installed for rotation inside the cylinder 1. A follower gear 441 is fixedly sleeved on the outer circumference of the transmission screw 44. The two follower gears 441 are engaged with the outer gear ring 421. A circular slider 442 is commonly movably sleeved on the two transmission screws 44. An elastic sealing sheet 443 is commonly connected between the circular slider 442 and the sliding block 431 and the accordion moving block 432. A fixed circular plate 446 is fixedly connected to the interior of the cylinder 1, and a circular accordion block 445 is commonly connected between the fixed circular plate 446 and the circular slider 442.

[0041] Specifically, the dual transmission screws 44 of the airflow compression component 4 are symmetrically arranged on both sides of the cylinder 1, and the meshing transmission ratio of the follower gear 441 and the outer gear ring 421 is 1:1, ensuring that the circular sliders 442 on both sides move synchronously. The circular slider 442 is connected to the elastic sealing sheet 443 by bolts, and the edge of the sealing sheet is embedded in the sealing groove on the inner wall of the cylinder to form a dynamic seal. The circular accordion block 445 is made of silicone material with a folded thickness of 5mm and a compression ratio of up to 3:1. Eight evenly distributed air guide holes are opened on the fixed circular plate 446, and the aperture gradually decreases along the direction of airflow, forming a Venturi effect to accelerate the airflow. The screw motor 52 of the detection component 5 drives the rotating screw 521 through the planetary reducer. When the sliding circular block 523 moves axially, the elastic air guide plate 55 is driven to open and close periodically through the first hinge rod 531 and the second hinge rod 542. The spacing between the detection heads 552 on the stretching sheet 551 is 10 mm, covering the entire airflow cross section. Each detection head is equipped with an independent signal line, which is connected to the control panel 11 through a slip ring to achieve multi-point synchronous detection.

[0042] In this embodiment, the detection component 5 is composed of a circular cylinder 51, which is fixedly connected to the inside of the cylinder body 1. A screw motor 52 is installed inside the cylinder body 1, and a rotating screw 521 is installed at the output end of the screw motor 52. A sliding round block 523 is movably sleeved on the outer circumference of the rotating screw 521. A plurality of circumferentially evenly distributed fixed connecting rods 543 are fixedly connected to the inside of the cylinder body 1, and one end of the plurality of fixed connecting rods 543 is commonly fixedly connected to an inner groove shaft 54, and one end of the inner groove shaft 54 ​​is fixedly connected to a joint 541, and a plurality of circumferentially evenly distributed second hinged rods 542 are movably hinged on the joint 541, and a plurality of circumferentially evenly distributed first hinged rods 531 are movably hinged on the sliding round block 523, and the first hinged rod 531 and the second hinged rod 542 are hinged to each other.

[0043] Specifically, the circular cylinder 51 of the detection component 5 is coaxially welded to the cylinder body 1, and the inner wall is sprayed with Teflon coating to reduce airflow resistance. The screw motor 52 realizes position closed-loop control through the encoder, and the clearance between the rotating screw 521 and the sliding round block 523 is controlled within 0.05mm. The inner groove shaft 54 ​​is a hollow structure, and the internal wiring groove is used to arrange the signal line of the detection head 552. The joint 541 is connected to the second hinge rod 542 through a fisheye bearing, allowing a deflection angle of ±5°. The elastic air guide plate 55 is made of 316 stainless steel sheet and fluororubber, with a thickness of 0.3mm and a deformation life of more than 100,000 times. The two ends of the stretching plate 551 are connected to the circular cylinder 51 by buckles, and the middle section can be freely extended and retracted. The detection head 552 is installed in the trough position to avoid direct impact of airflow. The control panel 11 has a built-in microprocessor to collect signals from each detection head in real time, compensate for airflow unevenness through an algorithm, and finally output the average concentration value.

[0044] In this embodiment, an elastic air guide plate 55 is fixedly mounted on a plurality of second hinged rods 542. A stretching plate 551 is connected between one end of the elastic air guide plate 55 and the circular cylinder 51. The stretching plate 551 is provided with a plurality of detection heads 552 evenly distributed around the circumference, and through grooves are provided on both sides of the detection head 552.

[0045] Specifically, the elastic air guide plate 55 of the detection component 5 is radial when unfolded, covering the entire cross-section of the circular cylinder 51. The detection head 552 on the stretch sheet 551 is staggered along the airflow direction to form a spatial detection array. The detection head 552 uses an electrochemical sensor, and the surface is covered with a porous PTFE membrane, which allows gas to penetrate while blocking particulate matter. The through-slot design allows the airflow on both sides of the detection head to form convection, accelerating the sensor response. The screw motor 52 drives the sliding circle 523 to move back and forth, driving the elastic air guide plate 55 to open and close periodically, simulating the human breathing rhythm and improving the detection sensitivity. The control panel 11 communicates with the host computer through the Bluetooth module, transmitting concentration data and device status in real time. The battery module 12 supports the fast charging protocol, can be fully charged within 2 hours, and has a battery life of up to 8 hours. The handle 13 has a built-in spirit level to ensure that the device is used vertically to avoid detection errors. The entire machine adopts an IP65 protection grade to meet the monitoring needs of harsh environments.

[0046] While embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and alterations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A harmful gas concentration detection device for environmental monitoring, comprising a cylinder (1), characterized in that: A negative pressure assembly (2) for negative pressure suction is installed at one end of the cylinder (1), an air flow guiding assembly (3) for air flow guidance is installed at the other end of the cylinder (1), and an air flow compression assembly (4) for air flow compression and a detection assembly (5) for air flow detection are installed inside the cylinder (1) and are arranged along the axis of the cylinder (1).

2. The harmful gas concentration detection device for environmental monitoring according to claim 1, characterized in that: A control panel (11) and a battery module (12) are respectively installed on the top of the cylinder (1), and two symmetrically arranged handles (13) are fixedly connected to both sides of the cylinder (1) by screws.

3. The harmful gas concentration detection device for environmental monitoring according to claim 1, characterized in that: The negative pressure assembly (2) is composed of a negative pressure motor (21), which is installed at one end of the barrel (1), and a negative pressure fan (22) is installed at the output end of the negative pressure motor (21).

4. The harmful gas concentration detection device for environmental monitoring according to claim 1, characterized in that: The airflow guide assembly (3) comprises an airflow spiral guide plate (33), which is fixedly connected to one end of the cylinder (1), and one end of the airflow spiral guide plate (33) is provided with a protrusion (32), and one end of the protrusion (32) is provided with a recess (31).

5. The harmful gas concentration detection device for environmental monitoring according to claim 1, characterized in that: The air flow compression component (4) is composed of a servo motor (41), the output end of the servo motor (41) is connected to a coaxially arranged transmission shaft (411) through a coupling, and a transmission gear (412) is fixedly sleeved on the outer circumference of the transmission shaft (411), and a rotating circular plate (42) is rotatably installed inside the cylinder (1), and an outer gear ring (421) is fixedly connected to the outer circumference of the rotating circular plate (42), and an inner spiral limit block (422) is fixedly connected to one side of the rotating circular plate (42), and the interior of the cylinder (1) is slidingly equipped with a plurality of sliding straight blocks (43) uniformly distributed around the circumference, and a limiting slot is provided inside the sliding straight block (43), and the limiting slot and the inner spiral limit block (422) are in contact with each other, and one end of the sliding straight block (43) is fixedly connected to a sliding block (431), and one side of each two sliding blocks (431) is fixedly connected to an organ moving block (432).

6. The harmful gas concentration detection device for environmental monitoring according to claim 5, characterized in that: Two symmetrically arranged transmission screws (44) are rotatably installed inside the cylinder (1), and a follower gear (441) is fixedly sleeved on the outer peripheral surface of the transmission screw (44), and the two follower gears (441) are meshed with the outer gear ring (421). A circular slider (442) is movably sleeved on the two transmission screws (44), and an elastic sealing sheet (443) is commonly connected between the circular slider (442) and the sliding block (431) and the accordion moving block (432). A fixed circular plate (446) is fixedly connected inside the cylinder (1), and a circular accordion block (445) is commonly connected between the fixed circular plate (446) and the circular slider (442).

7. The harmful gas concentration detection device for environmental monitoring according to claim 1, characterized in that: The detection assembly (5) is composed of a circular cylinder (51), which is fixedly connected to the inside of the cylinder (1); a screw motor (52) is installed inside the cylinder (1); a rotating screw (521) is installed at the output end of the screw motor (52); a sliding round block (523) is movably sleeved on the outer circumference of the rotating screw (521); a plurality of circumferentially uniformly distributed fixed connecting rods (543) are fixedly connected to the inside of the cylinder (1); one end of the plurality of fixed connecting rods (543) is fixedly connected to an inner groove shaft (54); one end of the inner groove shaft (54) is fixedly connected to a joint (541); a plurality of circumferentially uniformly distributed second hinged rods (542) are movably hinged on the joint (541); a plurality of circumferentially uniformly distributed first hinged rods (531) are movably hinged on the sliding round block (523); the first hinged rod (531) and the second hinged rod (542) are hinged to each other.

8. The harmful gas concentration detection device for environmental monitoring according to claim 7, characterized in that: An elastic air guide piece (55) is fixedly mounted on a plurality of the second hinged rods (542), a stretching piece (551) is connected between one end of the elastic air guide piece (55) and the circular cylinder (51), and a plurality of detection heads (552) evenly distributed around the circumference are arranged on the stretching piece (551), and through grooves are arranged on both sides of the detection head (552).

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