Underground environment-friendly ventilation pipeline

Abstract

The invention discloses an underground environment-friendly ventilation pipeline, which relates to the technical field of underground ventilation environment-friendly equipment and comprises a ventilation pipe, a filter ball, a partition plate, a semi-arc scraper blade, a semi-arc pipe, a piston pipe, a driving assembly and the like. The semi-arc scraping plate is attached to the filtering ball, the semi-arc pipe is connected with the piston pipe through the connecting pipe, the piston pipe is communicated with the ventilation pipe through the air pipe and provided with the electromagnetic valve, and the air pressure sensor is arranged in the ventilation pipe. During working, the filtering ball filters dust, and after the air pressure sensor detects high pressure caused by blockage, the electromagnetic valve is triggered to enable high-pressure air in the ventilation pipe to drive the piston plate and drive the driving assembly to drive the filtering ball to rotate, so that dust scraping of the semi-arc scraping plate and flushing of the semi-arc pipe are synchronously carried out. The device can automatically clean the blockage of the filter holes, guarantees the ventilation and filtering efficiency, does not need extra power, is environment-friendly and energy-saving, and is adaptive to an underground complex environment.

Description

An environmentally friendly ventilation duct for underground wells Technical Field

[0001] This invention relates to the field of underground ventilation and environmental protection equipment technology, specifically to an underground environmental protection ventilation duct. Background Technology

[0002] Underground working environments are harsh, with extremely high dust levels. Ventilation ducts, as core equipment for underground ventilation and pollution control, must simultaneously perform ventilation and dust filtration functions. Existing underground ventilation ducts typically incorporate internal filters to intercept dust and reduce pollutant emissions. However, in actual use, the surface of these filters easily absorbs large amounts of dust. As working time increases, this continuous dust accumulation leads to clogging of the filter pores, significantly increasing ventilation resistance and drastically reducing ventilation efficiency, failing to meet normal underground ventilation needs. Furthermore, clogged pores render the filtration function ineffective, allowing uninterrupted dust to be directly discharged with the gas, causing environmental pollution. In addition, the confined space and complex environment underground make manual cleaning of filters cumbersome, inefficient, and pose significant safety risks, hindering timely and effective cleaning and maintenance, severely impacting the stable operation of ventilation ducts and the effectiveness of environmental control. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an environmentally friendly underground ventilation duct.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an underground environmentally friendly ventilation duct, comprising a ventilation pipe and a filter ball disposed inside the ventilation pipe, the filter ball being rotatably connected to the ventilation pipe via an installation pipe, multiple partitions being disposed on the outer side of the filter ball, each partition being fixedly connected to the inner surface of the ventilation pipe, the filter ball and the multiple partitions dividing the internal channel of the ventilation pipe into two parts; a semi-circular scraper being fixedly installed inside the ventilation pipe, the semi-circular scraper being tightly fitted to the outer surface of the filter ball; a semi-circular tube being disposed inside the filter ball; a semi-circular notch being formed on one side of the semi-circular tube, and this side being tightly fitted to the inner surface of the filter ball, a connecting pipe being fixedly installed at the end of the semi-circular tube, and so on. The connecting pipe is fixedly connected to the outer surface of the ventilation pipe. A piston tube is fixedly installed on the outer surface of the ventilation pipe. A piston plate is slidably installed inside the piston tube. An elastic element is fixedly installed between the piston plate and one end of the piston tube. One end of the piston tube is connected to the interior of the connecting pipe through a water supply pipe. A first one-way valve is fixedly installed on the water supply pipe. A water inlet pipe is also fixedly installed on one end of the piston tube, and a second one-way valve is fixedly installed on the water inlet pipe. The other end of the piston tube is connected to the interior of the ventilation pipe through an air pipe. A solenoid valve is fixedly installed on the air pipe. A pressure sensor is installed inside the ventilation pipe. A drive assembly is installed on the outside of the ventilation pipe, which can drive the filter ball to rotate.

[0005] Preferably, the drive assembly includes a movable rod, a movable plate, a gear plate, and a gear; the movable rod is fixedly connected to the piston plate, the movable rod is fixedly connected to the movable plate through a connecting plate, the gear plate is fixedly mounted on the movable plate, the gear is fixedly mounted on the mounting tube, and the gear plate meshes with the gear.

[0006] Preferably, a placement plate is fixedly installed on the ventilation pipe and below the filter ball. A pair of exhaust ports are opened on the ventilation pipe, and the two exhaust ports are symmetrically distributed on both sides of the partition. A separation plate is fixedly installed between the inner surface of the placement plate and the ventilation pipe, and the separation plate is positioned between the two exhaust ports. A collection box is provided below each exhaust port. The collection box has an inlet. After the collection box is supported on the inner side of the placement plate, the inlet is located directly below the exhaust port.

[0007] Preferably, a magnetic suction plate is fixedly installed at one end of the placement plate, and one end of the collection box along its length is made of iron.

[0008] Preferably, an installation pipe is fixedly installed on the inner bottom surface of the ventilation duct and on the side of the waste outlet.

[0009] Preferably, the elastic element is a spring.

[0010] Compared with existing technologies, this invention provides an environmentally friendly ventilation duct for underground wells, which has the following advantages: 1. It has both environmental protection and energy-saving advantages: the filter ball accurately intercepts dust in the well, avoiding direct discharge of polluting gas and damage to the ecology. The flushing and dust scraping structure prevents filter pore blockage and ensures continuous and effective filtration and purification. The cleaning power comes from the high-pressure gas in the ventilation duct, which does not require additional driving equipment. The piston reset relies on the elastic force of the spring, and the automatic water replenishment does not require manual operation, which greatly reduces energy consumption and meets the needs of green and energy-saving development.

[0011] 2. Improve the stability of the ventilation system: The automatic cleaning function can eliminate the risk of filter blockage in time, avoid the decrease in ventilation efficiency caused by increased ventilation resistance, and ensure the stability of underground ventilation volume; waste and sewage are accurately collected through symmetrical waste outlets, separation plates prevent waste and sewage from mixing and accumulating, and magnetic absorption collection boxes are easy to pick up and put in, reducing maintenance downtime and ensuring the long-term stable operation of the ventilation and purification system.

[0012] 3. Adaptable to complex downhole environments and highly safe to use: The overall structure is made of high-strength wear-resistant materials, and the sealed design prevents gas and water leakage, making it suitable for humid and high-vibration downhole environments; the automatic cleaning and collection mechanism reduces the frequency of manual downhole operations, avoids the risks of operating in confined spaces, reduces the labor intensity of maintenance personnel, simplifies the installation process, and enhances the applicability and promotion value of the device in downhole environments.

[0013] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their descriptions, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 is a structural schematic diagram of the invention; Figure 2 is a cross-sectional structural schematic diagram of the invention; Figure 3 is a structural schematic diagram of the semi-arc tube, piston tube, air pipe, water supply pipe, and moving plate of the invention; Figure 4 is a disassembled structural schematic diagram of the piston tube, piston plate, and spring of the invention; Figure 5 is a structural schematic diagram of the filter ball, partition, and semi-arc scraper of the invention; Figure 6 is a structural schematic diagram of the ventilation pipe, placement plate, and separation plate of the invention; Figure 7 is a structural schematic diagram of the collection box of the invention.

[0015] In the diagram: 1. Ventilation duct; 2. Filter ball; 3. Baffle; 4. Semi-arc scraper; 5. Semi-arc tube; 6. Semi-arc notch; 7. Piston tube; 8. Piston plate; 9. Spring; 10. Installation tube; 11. Air pipe; 12. Solenoid valve; 13. Water supply pipe; 14. First check valve; 15. Connecting pipe; 16. Water inlet pipe; 17. Second check valve; 18. Movable rod; 19. Connecting plate; 20. Moving plate; 21. Toothed plate; 22. Gear; 23. Waste outlet; 24. Placement plate; 25. Separation plate; 26. Magnetic suction plate; 27. Collection box; 28. Inlet; 29. ​​Inclined guide plate. Detailed Implementation

[0016] The principles and features of the present invention are described below with reference to Figures 1 to 7. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0017] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] This invention discloses an environmentally friendly ventilation duct for underground wells, which aims to solve the problems of dust pollution control and easy clogging of filter components during underground ventilation, and realize the integrated functions of filtration and purification, automatic cleaning and waste collection.

[0020] Referring to Figures 1 to 7, the ventilation foundation structure of this invention is a ventilation pipe 1. The ventilation pipe 1 is made of high-strength carbon steel specifically for underground operations, and its inner wall is treated with anti-corrosion and wear-resistant materials to adapt to the harsh working environment of dampness and dust in underground environments. A filter ball 2 is installed at the core of the ventilation pipe 1. The filter ball 2 has a porous spherical structure and uses ceramic filter material, which features high temperature resistance, impact resistance, and high filtration accuracy. Its outer diameter matches the inner diameter of the ventilation pipe 1 to ensure sufficient contact and filtration during gas flow. The filter ball 2 is rotatably connected to the ventilation pipe 1 through the mounting pipes 10 at both ends. Specifically, the mounting pipe 10 is a hollow tubular structure. One end of it is fixedly welded to the center of the filter ball 2, and the other end penetrates the wall of the ventilation pipe 1. A sealed bearing is installed at the penetration position between the mounting pipe 10 and the wall of the ventilation pipe 1. The inner ring of the sealed bearing is interference-fitted with the mounting pipe 10, and the outer ring is fixedly connected to the wall of the ventilation pipe 1. This ensures that the filter ball 2 can rotate smoothly around its own axis and effectively prevents the gas in the ventilation pipe 1 from leaking from the connection gap.

[0021] Multiple baffles 3 are evenly distributed around the outer circumference of the filter ball 2. In this embodiment, the number of baffles 3 is preferably four, and the baffles 3 are made of steel plates of the same material as the ventilation pipe 1. Each baffle 3 is fixedly connected to the inner surface of the ventilation pipe 1 by welding. A gap of 0.5-1mm is reserved between the inner arc edge of the baffle 3 and the outer surface of the filter ball 2 to avoid affecting the rotation of the filter ball 2. The filter ball 2 and these four baffles 3 cooperate with each other to divide the internal channel of the ventilation pipe 1 into two independent flow areas, namely the air inlet area and the air outlet area, to ensure that the polluted gas in the mine can only flow from the air inlet area to the air outlet area through the filter ball 2, thereby achieving directional filtration.

[0022] To clean dust from the surface of the filter balls 2, a semi-circular scraper 4 is fixedly installed inside the ventilation duct 1. The semi-circular scraper 4 is made of wear-resistant rubber, and its curvature perfectly matches the curvature of the outer surface of the filter balls 2. The scraping surface of the semi-circular scraper 4 is in close contact with the outer surface of the filter balls 2, with the contact pressure controlled at 0.1-0.2 MPa. This ensures effective dust removal without excessive wear on the surface of the filter balls 2. Both ends of the semi-circular scraper 4 are fixed to the inner surface of the ventilation duct 1 by bolts, facilitating subsequent replacement and maintenance of the scraper.

[0023] A semi-arc tube 5 is installed inside the filter ball 2. The semi-arc tube 5 is a hollow metal tube, and its curvature matches the curvature of the inner surface of the filter ball 2. Its length is consistent with the axial length of the filter ball 2. A semi-arc notch 6 is opened on one side of the semi-arc tube 5. This side with the semi-arc notch 6 fits tightly against the inner surface of the filter ball 2, ensuring that the water jet can directly act on the inner surface of the filter ball 2. Connecting pipes 15 are welded and fixed to both ends of the semi-arc tube 5. The connecting pipes 15 are rigid metal tubes with an outer diameter smaller than the inner diameter of the mounting pipe 10. The end of the connecting pipe 15 away from the semi-arc tube 5 passes through the hollow channel of the mounting pipe 10 and extends to the outside of the ventilation pipe 1, where it is welded and fixed to the outer surface of the ventilation pipe 1. A gap is reserved between the connecting pipe 15 and the inner wall of the mounting pipe 10 to avoid affecting the rotation of the mounting pipe 10.

[0024] To provide flushing water to the semi-arc pipe 5, a piston pipe 7 is fixedly installed on the outer surface of the ventilation pipe 1 via a bracket. A piston plate 8 is slidably installed inside the piston pipe 7. The piston plate 8 is made of rubber sealing material, and its outer circumference is tightly fitted to the inner wall of the piston pipe 7 to achieve a sliding seal. An elastic element is fixedly installed between the piston plate 8 and the end of the piston pipe 7 furthest from the ventilation pipe 1. In this embodiment, the elastic element is specifically a spring 9, which is a compression spring. One end of the spring 9 is welded to the end face of the piston plate 8, and the other end is welded to the end plate of the piston pipe 7.

[0025] One end of the piston tube 7 near the connecting pipe 15 is connected to the interior of the connecting pipe 15 via a water supply pipe 13. Both ends of the piston tube 7 and the connecting pipe 15 are fixedly connected to each other by clamps. A first one-way valve 14 is fixedly installed on the water supply pipe 13. The first one-way valve 14 flows from the interior of the piston tube 7 to the interior of the connecting pipe 15, and its rated working pressure is 1.0 MPa. Simultaneously, a water inlet pipe 16 is fixedly installed on the end of the piston tube 7 near the spring 9. The other end of the water inlet pipe 16 is connected to the downhole water supply system. A second one-way valve 17 is fixedly installed on the water inlet pipe 16. The second one-way valve 17 flows from the external water source to the interior of the piston tube 7, cooperating with the first one-way valve 14 to achieve one-way water replenishment inside the piston tube 7.

[0026] To drive the piston plate 8 to move, the piston tube 7 is connected to the interior of the ventilation tube 1 via an air pipe 11 at one end near the ventilation tube 1, with its two ends fixedly connected to the piston tube 7 and the ventilation tube 1 respectively. A solenoid valve 12 is fixedly installed on the air pipe 11. The solenoid valve 12 is a normally closed solenoid directional valve.

[0027] To enable automatic triggering of the cleaning process, a pressure sensor is installed inside the ventilation duct 1. Specifically, the pressure sensor is installed within the air intake zone separated by the partition 3, with its detection end facing the air intake direction. Its signal output end is electrically connected to the control end of the solenoid valve 12 via a wire. The pressure sensor has a detection accuracy of 0.01 MPa and a set trigger threshold of 0.5 MPa. When the air pressure in the air intake zone reaches this threshold, a signal is automatically sent to control the solenoid valve 12 to open.

[0028] To drive the filter ball 2 to rotate, a drive assembly is installed on the outside of the ventilation pipe 1. This drive assembly specifically includes a movable rod 18, a moving plate 20, a toothed plate 21, and a gear 22. The movable rod 18 is a metal rod, one end of which is welded and fixed to the side of the piston plate 8 away from the spring 9. The other end extends through a pre-drilled hole at the end of the piston tube 7 to the outside of the piston tube 7. A sealing ring is installed between the pre-drilled hole and the movable rod 18 to ensure a sealing effect. The end of the movable rod 18 located outside the piston tube 7 is fixedly connected to the moving plate 20 via a connecting plate 19. The toothed plate 21 is fixedly installed on the side of the moving plate 20 near the mounting pipe 10. The gear 22 is fixedly installed at the end of the mounting pipe 10 extending to the outside of the ventilation pipe 1. The gear 22 meshes with the toothed plate 21. The linear movement of the toothed plate 21 drives the gear 22 to rotate, thereby driving the mounting pipe 10 and the filter ball 2 to rotate synchronously.

[0029] A placement plate 24 is welded and fixed to the ventilation duct 1 below the filter ball 2. A pair of exhaust ports 23 are provided in the area of ​​the ventilation duct 1 corresponding to the placement plate 24. The exhaust ports 23 are rectangular openings, and the two exhaust ports 23 are symmetrically distributed on both sides of the partition plate 3, corresponding to the air inlet side and air outlet side of the filter ball 2, respectively. A separation plate 25 is welded and fixed between the inner surface of the placement plate 24 and the outer surface of the ventilation duct 1. The separation plate 25 is located between the two exhaust ports 23, dividing the placement plate 24 into two independent placement areas.

[0030] Below each waste outlet 23 is a collection box 27 made of plastic, with an inlet 28 at its top. The inlet 28 is larger than the waste outlet 23 to ensure that waste can fall completely into it. After the collection box 27 is supported on the inside of the placement plate 24, the inlet 28 is located directly below the waste outlet 23, achieving precise collection of waste. To prevent the collection box 27 from shifting due to vibration in the well, a magnetic suction plate 26 is welded and fixed to one end of the placement plate 24. One end of the collection box 27 in the length direction is made of iron. After the collection box 27 is placed on the placement plate 24, the iron end is attracted and fixed to the magnetic suction plate 26. It can be separated by applying a certain pulling force when picking it up or putting it down. In addition, an inclined guide plate 29 is fixedly installed on the inner bottom surface of the ventilation pipe 1 and on one side of the waste outlet 23. Dust and water combine and flow smoothly into the collection box 27 along the inclined guide plate 29.

[0031] The working process of the underground environmental protection ventilation duct in this embodiment is as follows: 1. Normal filtration stage: The ventilation duct is connected to the underground ventilation system. After the ventilation equipment is started, the polluted gas containing dust in the mine is drawn into the air intake area of ​​the ventilation duct 1. When the gas passes through the filter ball 2, the dust is intercepted by the porous structure of the filter ball 2. The purified gas enters the air outlet area and is discharged to the outside, thus realizing the purification of polluted gas.

[0032] 2. Cleaning Trigger Phase: As filtration time increases, dust gradually accumulates on the surface of filter ball 2, leading to increased ventilation resistance and a continuous rise in air pressure in the intake zone. When the air pressure sensor detects that the air pressure in the intake zone reaches the set threshold of 0.5 MPa, it immediately sends an opening signal to solenoid valve 12, which is then energized and opened.

[0033] 3. Driving and Dust Scraping Stage: After the solenoid valve 12 is opened, the high-pressure gas in the air intake area enters the piston tube 7 through the air pipe 11, generating a rightward thrust on the piston plate 8. This thrust overcomes the elastic force of the spring 9, pushing the piston plate 8 towards the connecting pipe 15. As the piston plate 8 moves, it drives the movable rod 18 to move synchronously. The movable rod 18, through the connecting plate 19, drives the movable plate 20 and the toothed plate 21 to move horizontally in a straight line. The toothed plate 21 meshes with the gear 22, driving the gear 22, the mounting pipe 10, and the filter ball 2 to rotate synchronously. During the rotation of the filter ball 2, the dust adsorbed on its surface is continuously scraped off by the semi-circular scraper 4.

[0034] 4. Flushing stage: While the piston plate 8 moves, it squeezes the water stored inside the piston tube 7. Under pressure, the water flows through the water supply pipe 13 and the first one-way valve 14 into the connecting pipe 15, then flows into the semi-arc tube 5, and finally sprays evenly onto the inner surface of the filter ball 2 through the semi-arc notch 6 to flush the filter holes of the filter ball 2, thoroughly remove residual dust in the holes, and prevent the filter holes from clogging.

[0035] 5. Reset and Water Replenishment Stage: After the filter ball 2 is cleared, the ventilation resistance in the air inlet area decreases, and the air pressure gradually drops to a safe threshold. The air pressure sensor sends a signal to control the solenoid valve 12 to close. At this time, the high-pressure gas thrust disappears, and under the elastic reset force of the spring 9, the piston plate 8 moves to the left to reset. During the reset process of the piston plate 8, a negative pressure is formed inside the piston tube 7. External water is drawn into the piston tube 7 through the water inlet pipe 16 and the second one-way valve 17, completing the water replenishment and preparing for the next flush.

[0036] 6. Waste Collection Stage: During the cleaning process, the scraped dust mixes with the rinsing wastewater to form waste. Under gravity, this waste falls to the inner bottom surface of the ventilation duct 1 and is then discharged through the waste outlets 23 on both sides, falling into the collection box 27 through the inlet 28. When the collection box 27 is full, the staff can pull the collection box 27 outward to separate the iron end from the magnetic plate 26, remove the collection box 27 for waste cleaning, and then put it back into the placement plate 24.

[0037] This embodiment achieves efficient filtration of polluted gases in the mine, automatic cleaning of filter components, and centralized collection of waste through the above-mentioned structural design. The overall structure is compact, adaptable to the complex underground environment, and requires no frequent manual intervention, which greatly improves the stability and environmental friendliness of the ventilation system.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. An underground environmentally friendly ventilation duct, characterized in that: The system includes a ventilation duct (1) and a filter ball (2) disposed inside the ventilation duct (1). The filter ball (2) is rotatably connected to the ventilation duct (1) via an installation pipe (10). Multiple partitions (3) are provided on the outer side of the filter ball (2). Each partition (3) is fixedly connected to the inner surface of the ventilation duct (1). The filter ball (2) and the multiple partitions (3) divide the internal channel of the ventilation duct (1) into two parts. A semi-arc scraper (4) is fixedly installed inside the ventilation duct (1). The semi-arc scraper (4) is tightly fitted to the outer surface of the filter ball (2). A semi-arc tube (5) is disposed inside the filter ball (2). A semi-arc notch (6) is opened on one side of the semi-arc tube (5), and this side is tightly fitted to the inner surface of the filter ball (2). A connecting pipe (15) is fixedly installed on the end of the semi-arc tube (5). The connecting pipe (15) is fixedly connected to the outer surface of the ventilation duct (1). Next, a piston tube (7) is fixedly installed on the outer surface of the ventilation pipe (1), and a piston plate (8) is slidably installed inside the piston tube (7). An elastic element is fixedly installed between the piston plate (8) and one end of the piston tube (7). One end of the piston tube (7) is connected to the inside of the connecting pipe (15) through the water supply pipe (13). A first one-way valve (14) is fixedly installed on the water supply pipe (13). A water inlet pipe (16) is also fixedly installed on one end of the piston tube (7). A second one-way valve (17) is fixedly installed on the water inlet pipe (16). The other end of the piston tube (7) is connected to the inside of the ventilation pipe (1) through the air pipe (11). A solenoid valve (12) is fixedly installed on the air pipe (11). A pressure sensor is installed inside the ventilation pipe (1). A drive assembly is installed on the outside of the ventilation pipe (1). The drive assembly can drive the filter ball (2) to rotate.

2. The underground environmentally friendly ventilation duct according to claim 1, characterized in that: The drive assembly includes a movable rod (18), a movable plate (20), a toothed plate (21), and a gear (22); the movable rod (18) is fixedly connected to the piston plate (8), the movable rod (18) and the movable plate (20) are fixedly connected through a connecting plate (19), the toothed plate (21) is fixedly installed on the movable plate (20), the gear (22) is fixedly installed on the mounting tube (10), and the toothed plate (21) meshes with the gear (22).

3. The underground environmentally friendly ventilation duct according to claim 1, characterized in that: A placement plate (24) is fixedly installed on the ventilation pipe (1) and below the filter ball (2). A pair of exhaust ports (23) are opened on the ventilation pipe (1). The two exhaust ports (23) are symmetrically distributed on both sides of the partition plate (3). A separation plate (25) is fixedly installed between the inner surface of the placement plate (24) and the ventilation pipe (1). The separation plate (25) is set between the two exhaust ports (23). A collection box (27) is set below each exhaust port (23). An inlet (28) is opened on the collection box (27). After the collection box (27) is supported on the inner side of the placement plate (24), the inlet (28) is located directly below the exhaust port (23).

4. The underground environmentally friendly ventilation duct according to claim 3, characterized in that: A magnetic plate (26) is fixedly installed at one end of the placement plate (24), and one end of the collection box (27) in the length direction is made of iron.

5. The underground environmentally friendly ventilation duct according to claim 3, characterized in that: An installation pipe (10) is fixedly installed on the inner bottom surface of the ventilation pipe (1) and on one side of the exhaust port (23).

6. The underground environmentally friendly ventilation duct according to claim 1, characterized in that: The elastic element is a spring (9).

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