Collection device for grassland environment air quality detection

Abstract

The invention discloses a collection device for grassland environment air quality detection, and relates to the technical field of grassland environment detection.The device comprises a collection bin, a rapid recovery assembly, a storage assembly, a collection assembly and a sealing assembly, and the rapid recovery assembly is arranged on the periphery of the collection bin and used for rapidly recovering the storage assembly. According to the invention, air at different heights in the grassland can be collected at different time periods through the collection assembly, so that contrast experiment materials can be conveniently provided for subsequent detection; by means of the sealing assembly, when collected air is conveyed into the storage box, sealing of the connecting position of the first air inlet pipe and the second air outlet pipe is achieved, manual secondary sealing and sealing releasing operation on the air inlet pipe and the second air outlet pipe is not needed, and the task load of workers is greatly reduced; and through the rapid recovery assembly, the multiple storage vessels do not need to be independently disassembled, assembled and transferred, and the device is more convenient and rapid to use.

Description

Technical Field

[0001] The present invention relates to the technical field of grassland environment detection, and specifically to a collection device for detecting the air quality of the grassland environment. Background Art

[0002] As an important ecosystem, the air environmental quality of the grassland is an important indicator of the health of the ecological environment. By detecting the composition and quality of the grassland air, it is possible to understand whether the grassland ecosystem is polluted or damaged. For example, if the concentrations of pollutants such as sulfur dioxide, nitrogen oxides, and particulate matter in the air are too high, it may indicate problems such as industrial pollution, vehicle exhaust emissions, or overgrazing in the surrounding area. These pollutants can harm the grassland vegetation, soil, and animals, affecting the balance and stability of the ecosystem.

[0003] Before detecting the grassland environment, it is necessary to collect the air first. Existing collection devices can collect the air in different height areas of the grassland, and some devices can also collect the grassland air at different time periods. However, there is a lack of a device that can collect the air in different height areas at the same time in different time periods. And if it is necessary to collect the air in different height areas at different time periods, a large number of storage containers are required, which makes it time-consuming for the staff to recycle and place the storage containers, and the workload is relatively large; during the process of placing the storage containers, it is also necessary to closely connect the storage containers with the collection device, and the staff also needs to reinforce them twice to avoid air leakage, which further increases the workload of the staff.

[0004] Based on this, a collection device for detecting the air quality of the grassland environment is now provided, which can eliminate the drawbacks of existing devices. Summary of the Invention

[0005] The purpose of the present invention is to provide a collection device for detecting the air quality of the grassland environment to solve the problems of the disadvantages of the modern product in the background art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A collection device for detecting the air quality of the grassland environment includes a collection chamber, a rapid recovery component, a storage component, a collection component, and a sealing component. The rapid recovery component is arranged on the outer periphery of the collection chamber and is used for rapidly recovering the storage component;

[0008] A number of storage components are installed on the side wall of the rapid recovery component and are used for storing the collected air;

[0009] The collection component is arranged in the collection chamber and is used for collecting the air at different heights at different time periods;

[0010] A sealing assembly is provided inside the collection bin for sealing the connection between the storage assembly and the collection assembly to prevent air leakage.

[0011] Based on the above technical solutions, the present invention also provides the following alternative technical solutions:

[0012] In an alternative solution: The collection assembly includes a collection bin and a motor. A motor cavity and four collection cavities are provided inside the collection bin. The collection bin is connected to a rotating shaft through a bearing. The rotating shaft is connected to the motor. A turntable is fixedly connected to the part of the rotating shaft located inside the collection cavity. The inner wall of the collection cavity is fixedly connected with an air extraction box through a bracket. A first piston is slidably arranged through the air extraction box. A second intake pipe and a second outlet pipe are arranged on the side wall of the air extraction box. The second intake pipe extends through to the outside of the collection bin. One end of the first piston located outside the air extraction box is fixedly connected with a second slider. A guiding groove is arranged on the upper surface of the turntable. The second slider is slidably connected with the inner side wall of the guiding groove. The guiding groove is provided with a recessed area.

[0013] In an alternative solution: The rapid recovery assembly includes a storage rack and a handheld rack. Four storage racks are arranged on the periphery of the collection bin. The four storage racks are connected by a number of chains. A handheld rack is arranged on the top storage rack. A number of first sliders are fixedly connected to the inner ring of the storage rack. A number of guide rails are fixedly connected to the periphery of the collection bin. The first sliders are slidably connected with the inner side wall of the guide rails.

[0014] In an alternative solution: The storage assembly includes a second piston and a storage box. The storage rack is bolted to the storage box. A second piston is slidably arranged inside the storage box. A first outlet pipe and a first intake pipe are arranged on the side wall of the storage box.

[0015] In an alternative solution: The sealing assembly includes a cam and a sliding rod. The inner wall of the collection cavity is fixedly connected with a guiding cylinder through a bracket. The sliding rod is slidably arranged through the guiding cylinder. One end of the sliding rod is fixedly connected with a sealing cylinder. A ball is arranged at the other end of the sliding rod. A sliding plate is fixedly connected to the part of the sliding rod located inside the guiding cylinder. The sliding plate is slidably connected with the inner side wall of the guiding cylinder. A spring is fixedly connected between the sliding plate and the inner side wall of the guiding cylinder. A cam is fixedly connected to the part of the rotating shaft located inside the collection cavity. The ball abuts against the side wall of the cam.

[0016] In an alternative solution: a pressing block groove is formed in the side wall of the sealing cylinder, a pressing block is slidably connected to the inner side wall of the pressing block groove, a spring is fixedly connected between the pressing block and the inner side wall of the pressing block groove, a deformable rubber ring is arranged on the inner side wall of the sealing cylinder, the deformable rubber ring is a hollow ring, the deformable rubber ring is communicated with the pressing block groove through a pipeline, hydraulic oil is arranged in the pressing block groove, a plurality of mounting cylinders penetrate through the side wall of the collection bin, and an inclined plate is fixedly connected to the inner top wall of the mounting cylinder and abuts against the pressing block.

[0017] In an alternative solution: a plurality of magnets are arranged on the upper surface of the first slider.

[0018] In an alternative solution: one-way valves are arranged on the first air outlet pipe, the first air inlet pipe, the second air inlet pipe and the second air outlet pipe, and a detachable air nozzle cap is arranged at the opening of the first air outlet pipe.

[0019] In an alternative solution: exhaust holes are arranged in both the air extraction box and the storage box.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The present invention can collect air at different heights on the grassland at different time periods through the collection component, which is convenient for providing comparative experimental materials for subsequent detection.

[0022] 2. Through the sealing component, while transporting the collected air into the storage box, the present invention seals the connection between the first air inlet pipe and the second air outlet pipe, eliminating the need for manual secondary sealing and unsealing operations, greatly reducing the workload of the staff and making the device more convenient to use.

[0023] 3. Through the quick recovery component, there is no longer a need to separately disassemble, install and transfer several storage containers, greatly reducing the workload of the staff and making the device more convenient and fast to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the present invention.

[0025] Figure 2 is a schematic structural diagram of the quick recovery component of the present invention.

[0026] Figure 3 is a schematic structural diagram of the collection bin of the present invention.

[0027] Figure 4 is a schematic structural diagram of the interior of the collection bin of the present invention.

[0028] Figure 5 is of the present invention Figure 4 enlarged view of part A.

[0029] Figure 6 For the present invention Figure 5 Enlarged view at position B in the present invention.

[0030] Figure 7 First perspective view of the collection component of the present invention.

[0031] Figure 8 Second perspective view of the collection component of the present invention.

[0032] Figure 9 Schematic diagram of the turntable structure of the present invention.

[0033] Figure 10 Schematic diagram of the internal structure of the guide cylinder of the present invention.

[0034] Annotation of reference numerals in the drawings: 1 collection bin, 2 rapid recovery component, 3 storage component, 4 storage rack, 5 first slider, 6 chain, 7 hand-held rack, 8 guide rail, 9 motor, 10 rotating shaft, 11 first air outlet pipe, 12 first air inlet pipe, 13 air extraction box, 14 first piston, 15 second slider, 16 second air inlet pipe, 17 second air outlet pipe, 18 guide groove, 19 turntable, 20 cam, 21 sliding rod, 22 guide cylinder, 23 ball, 24 slide plate, 25 sealing cylinder, 26 inclined plate, 27 mounting cylinder, 28 deformable rubber ring, 29 pressing block, 30 collection component, 31 sealing component, 32 magnet, 33 second piston, 34 storage box. Detailed implementation manners

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0036] In one embodiment, as Figures 1-10 shown, a collection device for detecting the air quality of a grassland environment includes a collection bin 1, a rapid recovery component 2, a storage component 3, a collection component 30, and a sealing component 31. The rapid recovery component 2 is arranged on the outer periphery of the collection bin 1 and is used for rapidly recovering the storage component 3;

[0037] A number of storage components 3 are installed on the side wall of the rapid recovery component 2 and are used for storing the collected air;

[0038] A collection component 30 is arranged in the collection bin 1 and is used for collecting air at different heights at different time periods;

[0039] A sealing component 31 is arranged in the collection bin 1 and is used for sealing the connection between the storage component 3 and the collection component 30 to prevent air leakage.

[0040] In one embodiment, the collection component 30 includes a collection bin 1 and a motor 9. A motor chamber and four collection chambers are defined inside the collection bin 1. The collection bin 1 is connected to a rotating shaft 10 through a bearing. The rotating shaft 10 is connected to the motor 9. A turntable 19 is fixedly connected to a part of the rotating shaft 10 located inside the collection chamber. An air extraction box 13 is fixedly connected to the inner wall of the collection chamber through a bracket. A first piston 14 is slidably disposed through the air extraction box 13. A second intake pipe 16 and a second outlet pipe 17 are provided on the side wall of the air extraction box 13. The second intake pipe 16 extends through and outside the collection bin 1. One end of the first piston 14 located outside the air extraction box 13 is fixedly connected to a second slider 15. A guiding groove 18 is provided on the upper surface of the turntable 19. The second slider 15 is slidably connected to the inner side wall of the guiding groove 18. The guiding groove 18 is provided with a recessed area.

[0041] When it is necessary to collect grassland air at different heights at different time periods, the motor 9 is intermittently started through a program to adjust the time interval for collecting air. The motor 9 drives the rotating shaft 10 to rotate intermittently. The rotating shaft 10 drives the turntable 19 to rotate. Since the turntable 19 is provided with a recessed area, when the second slider 15 enters the recessed area, the first piston 14 sucks the outside air into the air extraction box 13. When the second slider 15 leaves the recessed area, the first piston 14 squeezes the outside air into the storage box 34 through the second outlet pipe 17, completing the air collection for the current time period. And since the collection components 30 are provided at different heights, the air at different heights can be collected simultaneously, facilitating the provision of comparative experimental materials for subsequent detection.

[0042] When the next time period comes, the motor 9 drives the rotating shaft 10 to rotate a certain angle again to complete the air collection for the next time period.

[0043] In one embodiment, the quick recovery component 2 includes a storage rack 4 and a hand-held rack 7. Four storage racks 4 are provided on the periphery of the collection bin 1. The four storage racks 4 are connected by a number of chains 6. A hand-held rack 7 is provided on the top storage rack 4. A number of first sliders 5 are fixedly connected to the inner ring of the storage rack 4. A number of guide rails 8 are fixedly connected to the periphery of the collection bin 1. The first sliders 5 are slidably connected to the inner side wall of the guide rails 8.

[0044] When each storage box 34 has stored the air sample, the lowermost storage rack 4 is moved upward to fit with the upper storage rack 4 through the magnet 32, and so on. Finally, the four storage racks 4 are fitted together. By holding the hand-held rack 7 by hand, all the storage boxes 34 are transferred away at one time. When it is necessary to install the quick recovery component 2 back onto the collection bin 1, only by guiding through the cooperation of the guide rails 8 and the first sliders 5 and then pulling down the storage racks 4 in sequence to separate the storage racks 4 from each other can the installation be completed. The installation operation is fast and convenient.

[0045] In one embodiment, the storage assembly 3 includes a second piston 33 and a storage box 34. The storage rack 4 is connected to the storage box 34 by bolts. The second piston 33 is slidably arranged inside the storage box 34. The side wall of the storage box 34 is provided with a first air outlet pipe 11 and a first air inlet pipe 12.

[0046] When the gas in the storage box 34 needs to be tested, it is only necessary to push the second piston 33, open the air nozzle cap on the first air outlet pipe 11, and discharge the air in the storage box 34 from the first air outlet pipe 11, without the need to disassemble the storage box 34 as a whole.

[0047] In one embodiment, the sealing assembly 31 includes a cam 20 and a sliding rod 21. The inner wall of the collection chamber is fixedly connected to a guide cylinder 22 through a bracket. The guide cylinder 22 passes through and is slidably connected to the sliding rod 21. One end of the sliding rod 21 is fixedly connected to a sealing cylinder 25. The other end of the sliding rod 21 is provided with a ball 23. The part of the sliding rod 21 located in the guide cylinder 22 is fixedly connected to a slide plate 24. The slide plate 24 is slidably connected to the inner wall of the guide cylinder 22. A spring is fixedly connected between the slide plate 24 and the inner wall of the guide cylinder 22. The part of the rotating shaft 10 located in the collection chamber is fixedly connected to the cam 20, and the ball 23 abuts against the side wall of the cam 20.

[0048] When the collecting assembly 30 is collecting air, the rotating shaft 10 drives the cam 20 to rotate. When the second slider 15 enters the recessed area of ​​the turntable 19, the ball 23 abuts against the raised part of the cam 20, so that the slide rod 21 drives the sealing cylinder 25 to move forward. The sealing cylinder 25 moves forward to wrap the joint between the first air inlet pipe 12 and the second air outlet pipe 17. At this time, the sealing cylinder 25 continues to advance, and the pressing block 29 contacts the inclined plate 26. The pressing block 29 is squeezed downward, and the pressure is transmitted through the hydraulic oil in the sealing cylinder 25 to prop up the deformed rubber ring 28 and fit it to the joint between the first air inlet pipe 12 and the second air outlet pipe 17 to achieve sealing and avoid air leakage.

[0049] In one embodiment, a pressing block groove is provided on the side wall of the sealing cylinder 25, and a pressing block 29 is slidably connected to the inner wall of the pressing block groove. A spring is fixedly connected between the pressing block 29 and the inner wall of the pressing block groove. A deformable rubber ring 28 is provided on the inner wall of the sealing cylinder 25. The deformable rubber ring 28 is a hollow ring. The deformable rubber ring 28 is connected to the pressing block groove through a pipeline. Hydraulic oil is provided in the pressing block groove. A plurality of mounting cylinders 27 are provided through the side wall of the collection bin 1. An inclined plate 26 is fixedly connected to the inner top wall of the mounting cylinder 27, and the inclined plate 26 abuts against the pressing block 29.

[0050] When the second slider 15 is removed from the recessed area of the turntable 19, the ball 23 moves to the non-protruding part of the cam 20, and the slide rod 21 is restored under the action of the spring. At the same time, the sealing cylinder 25 is restored and no longer wraps around the docking part of the first intake pipe 12 and the second outlet pipe 17, avoiding damage to the first intake pipe 12 located inside the sealing cylinder 25 when the rapid recovery assembly 2 is lifted.

[0051] While delivering the collected air into the storage box 34, the connection between the first intake pipe 12 and the second outlet pipe 17 is sealed, eliminating the need for manual secondary sealing and unsealing operations, greatly reducing the workload of the staff and making the device more convenient to use.

[0052] In one embodiment, a plurality of magnets 32 are provided on the upper surface of the first slider 5.

[0053] The first slider 5 adheres to the upper storage rack 4 through the magnets 32. The material of the storage rack 4 is a magnetic material.

[0054] In one embodiment, one-way valves are provided on the first outlet pipe 11, the first intake pipe 12, the second intake pipe 16, and the second outlet pipe 17, and a detachable air nozzle cap is provided at the opening of the first outlet pipe 11.

[0055] In one embodiment, exhaust holes are provided in both the air extraction box 13 and the storage box 34.

[0056] The exhaust holes facilitate the discharge of the air behind 14 and 33.

[0057] The above embodiments disclose a collection device for detecting the air quality of grassland environments, and its specific working principle and process are as follows:

[0058] S1: When it is necessary to collect grassland air at different heights at different time periods, the motor 9 is intermittently started through a program to adjust the time interval for collecting air. The motor 9 drives the rotating shaft 10 to rotate intermittently, and the rotating shaft 10 drives the turntable 19 to rotate. Since the turntable 19 is provided with a recessed area, when the second slider 15 enters the recessed area, the first piston 14 pumps the outside air into the air extraction box 13. When the second slider 15 leaves the recessed area, the first piston 14 squeezes the outside air into the storage box 34 through the second outlet pipe 17, completing the air collection for the current time period. And since the collection components 30 are provided at different heights, the air at different heights can be collected simultaneously, facilitating the provision of comparative experimental materials for subsequent detection;

[0059] When the next time period arrives, the motor 9 drives the rotating shaft 10 to rotate a certain angle again to complete the air collection for the next time period;

[0060] S2: While the collection component 30 is collecting air, the rotating shaft 10 drives the cam 20 to rotate. When the second slider 15 enters the recessed area of the turntable 19, the ball 23 abuts against the convex part of the cam 20, causing the slide rod 21 to drive the sealing cylinder 25 to move forward. As the sealing cylinder 25 moves forward, it wraps the connection between the first intake pipe 12 and the second outlet pipe 17. At this time, the sealing cylinder 25 continues to advance, and the pressing block 29 contacts the inclined plate 26. The pressing block 29 is squeezed downward, and through the hydraulic oil in the sealing cylinder 25 to conduct pressure, the deformable rubber ring 28 is propped up and fits at the connection of the first intake pipe 12 and the second outlet pipe 17 to achieve sealing and avoid air leakage.

[0061] When the second slider 15 is removed from the recessed area of the turntable 19, the ball 23 moves to the non-convex part of the cam 20, and the slide rod 21 is restored under the action of the spring. The sealing cylinder 25 is restored simultaneously and no longer wraps the connection part of the first intake pipe 12 and the second outlet pipe 17, avoiding damage to the first intake pipe 12 when the quick recovery component 2 is lifted while it is inside the sealing cylinder 25.

[0062] While delivering the collected air into the storage box 34, the sealing of the connection between the first intake pipe 12 and the second outlet pipe 17 is achieved, eliminating the need for manual secondary sealing and unsealing operations, greatly reducing the workload of the staff and making the device more convenient to use.

[0063] S3: When each storage box 34 has stored the air sample, move the lowermost storage rack 4 upward, and it fits with the upper storage rack 4 through the magnet 32. And so on, finally, the four storage racks 4 fit together. By holding the handle 7 by hand, all the storage boxes 34 are transferred away at one time.

[0064] When it is necessary to detect the gas in the storage box 34, only need to push the second piston 33, open the nozzle cap on the first outlet pipe 11, and discharge the air in the storage box 34 from the first outlet pipe 11, without the need to disassemble the whole storage box 34.

[0065] When it is necessary to install the quick recovery component 2 back onto the collection bin 1, only need to use the cooperation of the guide rail 8 and the first slider 5 for guiding, and then pull down the storage racks 4 in sequence to separate the storage racks 4 from each other, then the installation can be completed. The installation operation is quick and convenient.

[0066] There is no longer a need to separately disassemble, install, and transfer several storage containers, greatly reducing the workload of the staff and making the device more convenient and fast to use.

[0067] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A collection device for detecting grassland environmental air quality, characterized in that: It comprises a collection chamber (1), a rapid recovery component (2), a storage component (3), a collection component (30), and a sealing component (31); the rapid recovery component (2) is arranged on the periphery of the collection chamber (1) for rapid recovery of the storage component (3); The rapid recovery component (2) is provided with a plurality of storage components (3) for storing the collected air; The collection chamber (1) is provided with a collection component (30) for collecting air at different heights in different time periods; A sealing component (31) is provided in the collection chamber (1) and is used to seal the connection between the storage component (3) and the collection component (30) to prevent air leakage.

2. A grassland environment air quality detection collection device according to claim 1, characterized in that: The collection assembly (30) comprises a collection chamber (1) and a motor (9), wherein a motor chamber and four collection chambers are provided in the collection chamber (1), wherein the collection chamber (1) is connected to a rotating shaft (10) via a bearing, wherein the rotating shaft (10) is connected to the motor (9), wherein a portion of the rotating shaft (10) located in the collection chamber is fixedly connected to a rotating disk (19), wherein an inner wall of the collection chamber is fixedly connected to an air pumping box (13) via a bracket, wherein a first piston (19) is slidably provided in the air pumping box (13) and a first piston (19) is provided in a sliding manner therein. 14), a second air inlet pipe (16) and a second air outlet pipe (17) are arranged on the side wall of the air extraction box (13), the second air inlet pipe (16) extends through and extends to the outside of the collection chamber (1), one end of the first piston (14) located outside the air extraction box (13) is fixedly connected with a second slider (15), a guide groove (18) is arranged on the upper surface of the turntable (19), the second slider (15) is slidably connected to the inner wall of the guide groove (18), and the guide groove (18) is provided with a recessed area.

3. A grassland environment air quality detection collection device according to claim 2, characterized in that: The quick recovery component (2) comprises a storage rack (4) and a hand-held rack (7). Four storage racks (4) are arranged around the collection bin (1). The four storage racks (4) are connected by a plurality of chains (6). The storage rack (4) at the top is provided with a hand-held rack (7). The inner ring of the storage rack (4) is fixedly connected with a plurality of first sliders (5). The collection bin (1) is fixedly connected with a plurality of guide rails (8). The first sliders (5) are slidably connected with the inner wall of the guide rails (8).

4. A grassland environment air quality detection collection device according to claim 3, characterized in that: The storage assembly (3) comprises a second piston (33) and a storage box (34); the storage rack (4) is connected to the storage box (34) by bolts; the second piston (33) is slidably arranged inside the storage box (34); and the side wall of the storage box (34) is provided with a first air outlet pipe (11) and a first air inlet pipe (12).

5. A grassland environment air quality detection collection device according to claim 2, characterized in that: The sealing assembly (31) comprises a cam (20) and a sliding rod (21); the inner wall of the collection chamber is fixedly connected to a guide cylinder (22) through a bracket; the guide cylinder (22) penetrates and is slidably connected to the sliding rod (21); one end of the sliding rod (21) is fixedly connected to a sealing cylinder (25); the other end of the sliding rod (21) is provided with a ball (23); the portion of the sliding rod (21) located in the guide cylinder (22) is fixedly connected to a slide plate (24); the slide plate (24) is slidably connected to the inner wall of the guide cylinder (22); a spring is fixedly connected between the slide plate (24) and the inner wall of the guide cylinder (22); the portion of the rotating shaft (10) located in the collection chamber is fixedly connected to the cam (20); and the ball (23) abuts against the side wall of the cam (20).

6. A grassland environment air quality detection collection device according to claim 5, characterized in that: The side wall of the sealing cylinder (25) is provided with a pressing block groove, the inner wall of the pressing block groove is slidably connected with a pressing block (29), a spring is fixedly connected between the pressing block (29) and the inner wall of the pressing block groove, the inner wall of the sealing cylinder (25) is provided with a deformable rubber ring (28), the deformable rubber ring (28) is a hollow ring, the deformable rubber ring (28) is connected with the pressing block groove through a pipeline, hydraulic oil is provided in the pressing block groove, a plurality of mounting cylinders (27) are provided through the side wall of the collection bin (1), the inner top wall of the mounting cylinder (27) is fixedly connected with an inclined plate (26), and the inclined plate (26) is in contact with the pressing block (29).

7. A grassland environment air quality detection collection device according to claim 3, characterized in that: A plurality of magnets (32) are arranged on the upper surface of the first sliding block (5).

8. The grassland environment air quality detection collection device according to claim 4 is characterized in that: The first air outlet pipe (11), the first air inlet pipe (12), the second air inlet pipe (16), and the second air outlet pipe (17) are all provided with one-way valves, and a detachable air nozzle cap is provided at the opening of the first air outlet pipe (11).

9. A grassland environment air quality detection collection device according to claim 8, characterized in that: The air extraction box (13) and the storage box (34) are both provided with exhaust holes.

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