Air guiding device and ventilation system

Abstract

The application provides a wind guide device and a ventilation system, comprising a base, a lifting rod, an angle adjusting mechanism and a wind guide plate. The base fixes the wind guide device in the air supply channel, the lifting rod is fixedly connected with the base, the angle adjusting mechanism is fixedly connected with the lifting rod, and the wind guide plate is rotationally connected with the angle adjusting mechanism. The lifting rod can adjust the height of the wind guide plate, and the angle adjusting mechanism can adjust the orientation of the wind guide plate. By adjusting the height and orientation of the wind guide plate, the wind guide plate can guide part of the air flow in the air supply channel to the working point located in the pillar construction area, and the part of the air flow will directly impact the dirty air accumulated at the working point, so as to strongly wash and dilute the dirty air. The diluted dirty air will be dispersed away from the working point under the double actions of air flow dispersion and natural diffusion, and finally flow into the air supply channel and be discharged, so that the ventilation effect at the working point is improved, the dirty air accumulation problem is solved, the occupational health and personal safety of the workers are ensured, and the safety hidden danger is eliminated.

Description

Technical Field

[0001] This application relates to the field of mining engineering technology, and in particular to a ventilation device and ventilation system. Background Technology

[0002] The stope is the core space in mineral deposit mining where ore is directly excavated. When using the open-stope method to mine the stope (the main mining area within the stope), pillars need to be specifically installed to prevent the stope roof and surrounding rock from collapsing due to loss of support. This is known as pillar construction. A pillar is a solid ore structure intentionally preserved within the ore body. Its function is to bear the roof pressure and maintain stope stability. Pillars are typically formed when the stope is mined to a certain stage (such as when encountering areas of fractured rock strata or reaching a specified height), serving as a load-bearing structure to ensure mining safety.

[0003] Pillar construction is not a standalone construction of the pillar itself, but rather a series of engineering projects that lay the foundation for its supporting function and subsequent mining (if recovery is required). The core steps, in sequence, include: preparatory roadway excavation, which involves excavating dedicated passages such as raises (e.g., vertical or inclined passages for passage and ventilation) and connecting passages (e.g., horizontal or inclined short roadways that connect work points, such as connecting two raises), within or around the designated pillar area, providing pathways for subsequent operations; cutting operations to form free faces, which involves cutting upwards or outwards on both sides of the pillar (e.g., near the mined-out area of ​​an already mined stope), forming regular cutting faces through blasting or mechanical crushing. The purpose of this process is to create free faces (i.e., unobstructed spaces where the rock can be broken towards the mined-out area) for future mining blasting of the pillar, while ensuring that the temporary support capacity of the pillar is not affected during the cutting process.

[0004] During pillar construction, the main challenge lies in ventilation at the cutting points, especially at the higher cutting points on either side of the pillar (i.e., the work areas formed by upward or outward cutting). Specifically, blasting fumes and dust accumulate significantly and are difficult to expel. This problem stems from four main causes: First, the cutting point is surrounded by the pillar and surrounding rock, creating a narrow, semi-enclosed space where polluted air cannot disperse. Second, the through-flow of the mine's main ventilation system is significantly weakened by the time it reaches the higher cutting point, failing to effectively flush out polluted air. Third, the pillar, being a thick solid ore layer, blocks airflow on both sides, making it difficult for fresh air to enter the work area. Fourth, while blasting fumes and dust naturally rise due to thermal buoyancy, the cutting point is often located at a high elevation, blocked by the roof or uncut sections of the pillar, resulting in a closed upward passage and the accumulation of polluted air in a localized area.

[0005] In existing technologies, ventilation at the cutting point is typically addressed using forced-in or exhaust fans in conjunction with ventilation ducts. However, due to the narrow and high location of the cutting point, precise placement of the ventilation ducts is difficult, resulting in poor ventilation. This leads to the long-term accumulation of polluted air, seriously threatening the occupational health and personal safety of workers (e.g., fumes poisoning, pneumoconiosis risk), reducing construction efficiency, and posing safety hazards. Utility Model Content

[0006] Therefore, this application provides an air guiding device and a ventilation system, which improves the ventilation effect at the cutting point, solves the problem of polluted air accumulation, protects the occupational health and personal safety of workers, and eliminates safety hazards.

[0007] In a first aspect, this application provides a ventilation guiding device, which is installed in an air supply channel near a mine pillar. The ventilation guiding device includes:

[0008] Base;

[0009] The lifting rod is fixedly connected to the base;

[0010] Angle adjustment mechanism, fixedly connected to the lifting rod; and

[0011] The air guide plate is rotatably connected to the angle adjustment mechanism;

[0012] The lifting rod can adjust the height of the air guide plate, and the angle adjustment mechanism can adjust the orientation of the air guide plate so that the air guide plate can guide part of the airflow in the air supply channel to the work point located in the mine pillar construction area.

[0013] In some embodiments, the angle adjustment mechanism includes a U-shaped seat, a mounting rod, a first locking device, and a second locking device;

[0014] The mounting rod is fixedly connected to the air guide plate; the mounting rod is set inside the U-shaped seat and can rotate relative to the U-shaped seat in the vertical direction;

[0015] The bottom surface of the U-shaped seat has mounting holes, and the lifting rod is inserted into the mounting holes. The U-shaped seat can rotate horizontally relative to the axis of the mounting holes.

[0016] The first locking device is used to fix the position of the mounting rod relative to the U-shaped seat; the second locking device is used to fix the position of the U-shaped seat relative to the lifting rod.

[0017] In some embodiments, the mounting rod includes a mounting base and a rod body; the mounting base is disposed within a U-shaped seat and is rotatable relative to the U-shaped seat in a vertical direction; the rod body is fixedly connected to the air guide plate;

[0018] The mounting base has a through hole, and the rod is inserted into the through hole;

[0019] The first locking device is also used to fix the position of the rod relative to the mounting base.

[0020] In some embodiments, the rod is fixedly connected to the air guide plate via a mounting plate.

[0021] In some embodiments, the air guide plate includes a first air plate, a second air plate, and a third air plate; the second air plate and the third air plate are respectively disposed on the left and right sides of the first air plate;

[0022] The second air deflector can rotate relative to the left side of the first air deflector, and the third air deflector can rotate relative to the right side of the first air deflector.

[0023] With both the second and third air panels rotated and folded, the second air panel is sandwiched between the first and third air panels.

[0024] In some embodiments, the left side of the first air plate is connected to the right side of the second air plate via a rotating structure, and the left side of the first air plate and the right side of the second air plate have the same thickness.

[0025] The right side of the second air panel is connected to the left side of the third air panel through a rotating structure. The right side of the first air panel and the left side of the third air panel have the same thickness.

[0026] The thickness of the right side of the first air deflector is 1.5 times the thickness of the left side, and the thickness of the left side is equal to the thickness of the air deflector.

[0027] In some embodiments, the first air plate, the second air plate, and / or the third air plate are provided with micropores.

[0028] In some embodiments, the boom has a height indicator.

[0029] In some embodiments, the base includes at least three foldable support leg structures; the multiple support leg structures are evenly spaced on the base.

[0030] Secondly, this application provides a ventilation system including an air supply device and an air guide device as described in any embodiment of the first aspect; the air supply device is used to form an air supply channel, and the air guide device is disposed within the air supply channel.

[0031] Based on the above technical solution, by adjusting the height and orientation of the air guide plate, it is ensured that a portion of the airflow in the air supply channel can be guided to the work point located within the pillar construction area. This portion of the airflow directly impacts the polluted air accumulated at the pre-cutting work point, powerfully flushing and diluting it. Furthermore, the diluted polluted air, under the dual effects of airflow dispersion and natural diffusion, will be dispersed away from the pre-cutting work point and eventually flow into the air supply channel for discharge. Therefore, the ventilation effect at the work point is improved, the problem of polluted air accumulation is solved, the occupational health and personal safety of workers are protected, and safety hazards are eliminated. In addition, the air guide device in this application has a simple structure, is not only low in cost, but also has low manufacturing, installation, and maintenance costs, making it very suitable for mining engineering. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A schematic diagram of a structure in which an air guiding device is installed in the main air supply channel;

[0034] Figure 2 A schematic diagram of a structure in which an air guiding device is installed in a bypass air supply duct;

[0035] Figure 3 This is a schematic diagram of the air guide device in one embodiment of this application;

[0036] Figure 4 This is a schematic diagram of another structure of the air guide device in the embodiments of this application;

[0037] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0038] Figure 6 This is an exploded view of the angle adjustment mechanism in one embodiment of this application;

[0039] Figure 7 This is an exploded view of one structure of the mounting rod in an embodiment of this application;

[0040] Figure 8 This is a schematic diagram of a U-shaped seat in one embodiment of this application;

[0041] Figure 9 This is a schematic diagram of one structure of the air guide plate in an embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100. Air guide device; 110. Base; 120. Lifting rod; 130. Angle adjustment mechanism; 140. Air guide plate; 111. Support leg; 112. Connecting rod; 113. Sliding ring; 131. U-shaped seat; 132. Mounting rod; 133. First locking device; 134. Second locking device; 1311. Mounting hole; 1321. Mounting seat; 1322. Rod body; 1323. Through hole; 1324. Mounting plate; 141. First air vane; 142. Second air vane; 143. Third air vane;

[0044] 200. Air supply device; 210. Air supply fan; 220. Exhaust fan. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0047] It should also be understood that the terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, or the above-mentioned drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence, and should not be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.

[0048] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0049] The ventilation system provided in this application embodiment includes an air guide device 100 and an air supply device 200. The air supply device 200 is used to form an air supply channel, and the air guide device 100 is disposed within the air supply channel. In some embodiments, the air supply device 200 may include a blower 210 and an exhaust fan 220. Specifically, the blower 210 blows air towards the exhaust fan 220, while the exhaust fan 220 exhausts air, thus forming an air supply channel. For example, as shown... Figure 1As shown, the air guiding device 100 can be installed within the main air supply duct. For example, both the blower 210 and the exhaust fan 220 can be installed within a ventilation level, in which case the ventilation level becomes the main air supply duct. For example, as shown... Figure 2 As shown, the air guiding device 100 can be installed in a bypass ventilation duct. For example, if a ventilation shaft is connected to a manhole, the airflow in the ventilation shaft will blow towards the manhole, which then becomes the bypass ventilation duct. It should be noted that the air guiding device 100 can direct a portion of the airflow in the ventilation duct to the pre-cutting work point located within the pillar construction area. This allows the airflow to directly impact the polluted air accumulated at the pre-cutting work point, forcefully flushing and diluting it. Furthermore, the diluted polluted air, under the combined effects of airflow dispersion and natural diffusion, will be dispersed away from the pre-cutting work point and eventually flow into the ventilation duct for discharge.

[0050] Therefore, the air guide device 100 can improve the ventilation effect at the cutting point, solve the problem of polluted air accumulation, protect the occupational health and personal safety of workers, and eliminate safety hazards. For example, as... Figure 1 and Figure 2 As shown, the preparatory cutting point can be located at a high position in the cutting riser on the right side of the pillar. Through the installed air guide device 100, part of the airflow in the air supply channel can be guided to the preparatory cutting point to improve the ventilation effect of the point.

[0051] Please see Figures 3-9 The air guiding device 100 in this embodiment includes a base 110, a lifting rod 120, an angle adjustment mechanism 130, and an air guiding plate 140. The base 110 is used to fix the air guiding device 100 within the air supply channel. The lifting rod 120 is fixedly connected to the base 110, the angle adjustment mechanism 130 is fixedly connected to the lifting rod 120, and the air guiding plate 140 is rotatably connected to the angle adjustment mechanism 130. It should be noted that the lifting rod 120 is existing technology, and this embodiment does not impose specific limitations on its implementation. For example, it can be implemented as shown in the attached drawings, where an outer cylinder is fitted with an inner cylinder, and the inner cylinder can slide relative to the outer cylinder. With the locking structure shown in the drawings, the lifting function can be achieved. Specifically, when the locking is released, the inner cylinder can slide relative to the outer cylinder for adjustment; after adjustment, the locking is restored to fix the position of the inner cylinder relative to the outer cylinder. For example, the lifting rod 120 can have a height indicator, such as a scale on the inner cylinder, which can enhance the user experience.

[0052] In this embodiment, the lifting rod 120 can adjust its own height, thereby adjusting the height of the angle adjustment mechanism 130. Since the air guide plate 140 is connected to the angle adjustment mechanism 130, the lifting rod 120 can adjust the height of the air guide plate 140. Furthermore, the angle adjustment mechanism 130 can adjust the orientation of the air guide plate 140, for example, by adjusting the horizontal and vertical orientation of the air guide plate 140. Thus, by adjusting the height and orientation of the air guide plate 140, it is ensured that the air guide plate 140 can guide a portion of the airflow within the air supply channel to the work point located within the mine pillar construction area. Specifically, an air guide plate 140 with a suitable height and orientation will block the airflow passing through it and guide it towards the target work point. As previously stated, this airflow directly impacts the polluted air accumulated at the pre-cutting point, forcefully flushing and diluting it. Furthermore, the diluted polluted air, under the combined effects of airflow dispersion and natural diffusion, is dispersed away from the pre-cutting point and ultimately discharged into the air supply duct. Therefore, this improves ventilation at the work site, solves the problem of polluted air accumulation, protects the occupational health and personal safety of workers, and eliminates safety hazards. In addition, the air guiding device 100 in this embodiment has a simple structure, is low in cost, and has low manufacturing, installation, and maintenance costs, making it very suitable for mining engineering.

[0053] In some embodiments, such as Figures 4 to 8 As shown, the angle adjustment mechanism 130 includes a U-shaped seat 131, a mounting rod 132, a first locking device 133, and a second locking device 134. Through these structures, the height and orientation of the air guide plate 140 can be adjusted.

[0054] On one hand, the mounting rod 132 is disposed within the U-shaped seat 131 and can rotate vertically relative to the U-shaped seat 131. Furthermore, the mounting rod 132 is fixedly connected to the air guide plate 140. Therefore, the vertical orientation of the air guide plate 140 can be adjusted by adjusting the mounting rod 132. On the other hand, the bottom surface of the U-shaped seat 131 has a mounting hole 1311, into which the lifting rod 120 is inserted. The U-shaped seat 131 can rotate horizontally relative to the axis of the mounting hole 1311. Therefore, the horizontal orientation of the air guide plate 140 can be adjusted by adjusting the U-shaped seat 131. Thus, the orientation of the air guide plate 140 can be adjusted by adjusting the mounting rod 132 and the U-shaped seat 131.

[0055] Additionally, when the orientation of the air guide plate 140 does not need to be adjusted, such as when the orientation of the air guide plate 140 has already been adjusted, it needs to be fixed. For this purpose, the first locking device 133 is used to fix the position of the mounting rod 132 relative to the U-shaped seat 131, and the second locking device 134 is used to fix the position of the U-shaped seat 131 relative to the lifting rod 120. In this way, the air guide plate 140 can be fixed by fixing and locking from both sides.

[0056] For example, when it is necessary to adjust the orientation of the air guide plate 140, the second locking device 134 can be released first, and the position of the U-shaped seat 131 relative to the lifting rod 120 can be adjusted to adjust the horizontal orientation of the air guide plate 140. After the adjustment is completed, the second locking device 134 can be locked again. Next, the first locking device 133 can be released, and the position of the mounting rod 132 relative to the U-shaped seat 131 can be adjusted to adjust the vertical orientation of the air guide plate 140. After the adjustment is completed, the first locking device 133 can be locked again. In this way, the orientation of the air guide plate 140 can be adjusted. Of course, the adjustment method can be flexibly operated and is not limited to the method provided in this example. In addition, the height of the air guide plate 140 can also be adjusted by the lifting rod 120.

[0057] It should be noted that the locking device is existing technology, and the implementation of it in this application does not impose specific limitations. For example, it can be a screw-on structure as shown in the figure. When the tightener is rotated inward, it is pressed to achieve the effect of fixing and locking. Conversely, when it is rotated outward, it is released from fixing and locking. This structure is used, for example, in fan equipment.

[0058] In some embodiments, such as Figure 7 As shown, the mounting rod 132 includes a mounting base 1321 and a rod body 1322. The mounting base 1321 is disposed within the U-shaped seat 131 and can rotate vertically relative to the U-shaped seat 131, while the rod body 1322 is fixedly connected to the air guide plate 140. The mounting base 1321 has a through hole 1323, and the rod body 1322 is inserted into the through hole 1323. For example, as... Figure 4 , Figure 6 and Figure 7 As shown, the rod 1322 can be fixedly connected to the air guide plate 140 through the mounting plate 1324.

[0059] Based on this, the first locking device 133 is also used to fix the position of the rod 1322 relative to the mounting base 1321. Thus, when adjusting the position of the mounting rod 132 relative to the U-shaped seat 131, i.e., adjusting the vertical orientation of the air guide plate 140, the position of the rod 1322 relative to the mounting base 1321 can also be adjusted, allowing for adjustment of the front-to-back position of the air guide plate 140 relative to the U-shaped seat 131. This enriches the adjustment methods of the air guide plate 140 and improves the applicability of the entire device.

[0060] For example, when the first locking device 133 is released from its fixed locking position, the position of the mounting rod 132 relative to the U-shaped seat 131 can be adjusted to adjust the vertical orientation of the air guide plate 140. On the other hand, the position of the rod body 1322 relative to the mounting seat 1321 can be adjusted to adjust the front and rear position of the air guide plate 140 relative to the U-shaped seat 131. After the adjustment is completed, the first locking device 133 can be restored to its fixed locking position.

[0061] In some embodiments, such as Figure 3 , Figure 4 and Figure 9 As shown, the air guide plate 140 includes a first air plate 141, a second air plate 142, and a third air plate 143. The second air plate 142 and the third air plate 143 are respectively located on the left and right sides of the first air plate 141. The second air plate 142 can rotate relative to the left side of the first air plate 141, and the third air plate 143 can rotate relative to the right side of the first air plate 141. Therefore, in this embodiment, the second air plate 142 and the third air plate 143 are foldable, which allows adjustment of the air guiding area of ​​the air guide plate 140 to adjust the coverage area of ​​the device. Moreover, the foldable design also facilitates transportation of the entire device in narrow downhole spaces.

[0062] In this embodiment, when both the second air plate 142 and the third air plate 143 are rotated and folded, the second air plate 142 is sandwiched between the first air plate 141 and the third air plate 143. That is, when the air plates need to be folded, the second air plate 142 is folded first, and then the third air plate 143 is folded, so that the three air plates are basically the same size. Therefore, when the same air plate area is required, this method can minimize the area of ​​a single air plate, which is beneficial to the miniaturization of the device, and thus more conducive to the transportation of the device in narrow underground spaces. Exemplarily, the first air plate 141, the second air plate 142 and / or the third air plate 143 can be provided with micropores. Micropores can eliminate local turbulence, make the airflow more uniform, and also reduce airflow disturbance noise, thus reducing noise and drag.

[0063] In some embodiments, the left side of the first air plate 141 is connected to the right side of the second air plate 142 via a rotating structure, and the left side of the first air plate 141 and the right side of the second air plate 142 have the same thickness. Similarly, the right side of the second air plate 142 is connected to the left side of the third air plate 143 via a rotating structure, and the right side of the first air plate 141 and the left side of the third air plate 143 have the same thickness. Exemplarily, the rotating structure is prior art, and the implementation of it in this application embodiment is not specifically limited; for example, it can be a hinge structure as shown in the accompanying drawings.

[0064] Based on this, such as Figure 9As shown, the thickness of the right side of the first air panel 141 is 1.5 times the thickness of the left side, and the thickness of the left side is equal to the thickness of the air panel. This ensures that after the third air panel 142 is folded, it creates a space equal to the thickness of the air panel. This structural design ensures the smooth folding of the second air panel 142 and the third air panel 143.

[0065] In some embodiments, such as Figure 1 and Figure 2 As shown, the base 110 may include at least three foldable support leg structures, with the multiple support leg structures evenly spaced on the base 110. The foldable design facilitates transportation of the entire device in confined downhole spaces, thereby improving the device's applicability.

[0066] For example, the three-leg structure may include three legs 111, three connecting rods 112, and a sliding ring 113. The legs 111 are rotatably connected to the base 110, the connecting rods 112 are rotatably connected to both the legs 111 and the connecting rods 112, and the sliding ring 113 is slidably connected to the base 110. Thus, pulling the sliding ring 113 upwards allows for folding.

[0067] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An air guiding device, characterized in that, The ventilation guide device, located in the ventilation duct near the mine pillar, includes: Base; The lifting rod is fixedly connected to the base; Angle adjustment mechanism, fixedly connected to the lifting rod; and The air guide plate is rotatably connected to the angle adjustment mechanism; The lifting rod can adjust the height of the air guide plate, and the angle adjustment mechanism can adjust the orientation of the air guide plate so that the air guide plate can guide part of the airflow in the air supply channel to the work point located in the mine pillar construction area.

2. The air guiding device according to claim 1, characterized in that, The angle adjustment mechanism includes a U-shaped seat, a mounting rod, a first locking device, and a second locking device; The mounting rod is fixedly connected to the air guide plate; the mounting rod is disposed inside the U-shaped seat and can rotate relative to the U-shaped seat in the vertical direction; The bottom surface of the U-shaped seat has a mounting hole, the lifting rod is inserted into the mounting hole, and the U-shaped seat can rotate horizontally relative to the axis of the mounting hole. The first locking device is used to fix the position of the mounting rod relative to the U-shaped seat; the second locking device is used to fix the position of the U-shaped seat relative to the lifting rod.

3. The air guiding device according to claim 2, characterized in that, The mounting rod includes a mounting base and a rod body; the mounting base is disposed within the U-shaped seat and can rotate relative to the U-shaped seat in the vertical direction; the rod body is fixedly connected to the air guide plate; The mounting base has a through hole, and the rod is inserted into the through hole; The first locking device is also used to fix the position of the rod relative to the mounting base.

4. The air guiding device according to claim 3, characterized in that, The rod is fixedly connected to the air guide plate via a mounting plate.

5. The air guiding device according to claim 1, characterized in that, The air guide plate includes a first air plate, a second air plate, and a third air plate; the second air plate and the third air plate are respectively located on the left and right sides of the first air plate; The second air vane is rotatable relative to the left side of the first air vane, and the third air vane is rotatable relative to the right side of the first air vane. When both the second air plate and the third air plate are rotated and folded, the second air plate is sandwiched between the first air plate and the third air plate.

6. The air guiding device according to claim 5, characterized in that, The left side of the first air plate is connected to the right side of the second air plate through a rotating structure, and the left side of the first air plate and the right side of the second air plate have the same thickness. The right side of the second air plate is connected to the left side of the third air plate through a rotating structure, and the right side of the first air plate and the left side of the third air plate have the same thickness. The thickness of the right side of the first air deflector is 1.5 times the thickness of the left side, and the thickness of the left side is equal to the thickness of the air deflector.

7. The air guiding device according to claim 5, characterized in that, The first air plate, the second air plate, and / or the third air plate are provided with micropores.

8. The air guiding device according to any one of claims 1-7, characterized in that, The lifting rod has a height indicator.

9. The air guiding device according to any one of claims 1-7, characterized in that, The base includes at least three foldable support leg structures; multiple support leg structures are evenly spaced on the base.

10. A ventilation system, characterized in that, Includes an air supply device and an air guiding device as described in any one of claims 1-9; The air supply device is used to form an air supply channel, and the air guide device is disposed within the air supply channel.

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