Valve for ventilating duct

Abstract

The utility model relates to the technical field of air valves, in particular to a valve for a ventilation pipeline, and solves the problem that a blade plate or a motor in an air valve in the prior art is inconvenient to maintain or replace after being damaged. Comprising a ventilation pipe, a cover plate, a rotating seat, a blade plate, a lifting mechanism, a rotating mechanism, a locking assembly and a movable plate. The two ends of the ventilation pipe are communicated, an opening is formed in the top end of the ventilation pipe, a movable opening is further formed beside the opening, the movable plate is movably inserted into the movable opening and used for sealing the ventilation pipe, the opening is detachably connected with the cover plate, the blade plates are located in the ventilation pipe, the blade plates are arranged in a circumferential array mode, and each blade plate is fixedly connected with the rotating base. The rotating seat is detachably connected with the rotating mechanism in an inserted mode, the rotating mechanism is used for driving the rotating seat to rotate, the rotating mechanism is installed on the lifting mechanism, after the opening is separated from the cover plate, the lifting mechanism can ascend and descend to enable the blade plate and the rotating mechanism to go in and out of the opening, and after the rotating seat and the rotating mechanism are connected in an inserted mode, the locking assembly locks the rotating seat and the rotating mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of air valves, in particular to a valve used in a ventilation duct. Background Art

[0002] Ventilation control is a crucial link in grain storage management in granaries. It not only ensures the continuous circulation of air in the granary and effectively prevents grain deterioration, but also inhibits the growth of insects and harmful bacteria by reducing oxygen concentration, thus ensuring the long-term safe storage of grain. In this process, the air valve, as a key component of the ventilation system, realizes the effective circulation and drying of the air inside the granary through opening and closing operations, significantly reduces air humidity, and further protects the quality of grain.

[0003] Granaries are often equipped with multiple air valves to meet different ventilation needs. In actual operation, in order to optimize energy utilization and take into account local weather conditions, not all air valves are activated at the same time. In this case, the numerous air valves in the granary ventilation duct system work alternately, and the number of air valves is large. Damage to the blade plate or motor in the air valve will cause the corresponding ventilation duct to lose its wind regulating function. However, in the prior art, the air valve is set inside the ventilation duct, and maintenance or replacement work is very inconvenient after a failure occurs.

[0004] In view of this, the inventor proposes a valve for a ventilation duct, which is convenient for maintenance. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present utility model is to provide a valve for a ventilation duct, which is used to solve the problem that the blade plate or the motor in the wind valve in the current technology is inconvenient to maintain or replace after being damaged.

[0006] To achieve the above-mentioned purpose and other related purposes, the utility model provides a valve for a ventilation duct, including a ventilation pipe, a cover plate, a rotating seat, a blade plate, a lifting mechanism, a rotating mechanism, a locking assembly and a movable plate;

[0007] The two ends of the ventilation pipe are through-connected, and an opening is provided at the top end. A movable opening is also provided next to the opening. The movable plate is movably plugged into the movable opening. The movable plate is used to close the ventilation pipe. The opening is detachably connected to the cover plate. The blade plate is located in the ventilation pipe. A plurality of blade plates are arranged in a circumferential array and each blade plate is fixedly connected to the rotating seat. The rotating seat is detachably plug-connected to the rotating mechanism. The rotating mechanism is used to drive the rotating seat to rotate. The rotating mechanism is installed on the lifting mechanism. After the opening is separated from the cover plate, the lifting mechanism can be lifted and lowered to allow the blade plate and the rotating mechanism to enter and exit the opening. After the rotating seat and the rotating mechanism are plug-connected, the locking assembly locks the two.

[0008] Optionally, the rotating mechanism includes a first motor and a first rotating shaft;

[0009] The first motor is fixedly installed on the lifting mechanism, one end of the first rotating shaft is fixedly connected to the output shaft of the first motor, and the other end is detachably plugged into the rotating seat. After the first rotating shaft is plugged into the rotating seat, the locking assembly locks the connection between the two.

[0010] Optionally, the rotating seat is provided with a through area in the axial direction, the end surface of the rotating seat away from the rotating mechanism is provided with an annular groove area, the through area is communicated with the annular groove area, a notch is provided at one end of the first rotating shaft away from the first motor, and the locking assembly is rotatably mounted on the first rotating shaft and is axially limited;

[0011] When the locking assembly rotates into the notch, the rotating seat and the first rotating shaft can be separated;

[0012] When the locking assembly rotates out of the notch, the rotating seat and the first rotating shaft are inseparable.

[0013] Optionally, the locking assembly includes a second rotating shaft, a first L-shaped member, a second L-shaped member and a spring;

[0014] The second rotating shaft is rotatably connected to the first rotating shaft and is axially limited, the vertical section of the first L-shaped member is fixedly connected to the second rotating shaft, the horizontal section of the first L-shaped member defines an L-shaped cavity, the second L-shaped member is within the L-shaped cavity and can move radially along the second rotating shaft, the two ends of the spring are respectively fixedly connected to the second L-shaped member and the second section of the first L-shaped member, the rotating seat defines a socket connected to the annular groove area, and the vertical end of the second L-shaped member can be inserted into the socket under the elastic force of the spring.

[0015] Optionally, the lifting mechanism includes a lifting platform, a rack, a gear and a second motor;

[0016] The rotating mechanism is fixedly installed on the lifting platform, the lifting platform is slidably connected to the inner wall of the ventilation pipe, the lifting platform is fixedly connected to the rack, the rack is meshingly connected to the gear, the gear is fixedly connected to the output shaft of the second motor, the output shaft of the second motor is rotatably installed on the wall of the ventilation pipe, the lifting platform, the rack and the gear are located in the inner cavity of the ventilation pipe, and the body of the second motor is fixedly installed on the outer wall of the ventilation pipe.

[0017] Optionally, sliding protrusions are fixedly connected to both sides of the lifting platform, and sliding grooves are provided at positions corresponding to the sliding protrusions on both sides of the inner wall of the ventilation pipe, and the sliding protrusions slide in the sliding grooves.

[0018] Optionally, it also includes a reinforcing plate and a mounting plate, wherein the mounting plate is horizontally arranged and fixedly connected to the ventilation pipe, the second motor is fixedly installed on the mounting plate, and the reinforcing plate is inclinedly arranged, one end of which is fixedly connected to the ventilation pipe, and the other end of which is fixedly connected to the mounting plate.

[0019] Optionally, the lifting platform and the ventilation pipe are both provided with a power socket slot.

[0020] Optionally, the cover plate is detachably connected to the ventilation pipe via bolts.

[0021] Optionally, buckling grooves are provided at both ends of the cover plate.

[0022] As described above, the utility model has the following beneficial effects:

[0023] The present application, through the lifting mechanism, can make the blade plate and the rotating mechanism extend from the open part of the ventilation pipe, so as to facilitate the maintenance or replacement of the blade plate by the staff. The present application, through the rotating mechanism and the locking assembly, the rotating mechanism enables the blade plate to rotate normally during operation, so that the interior of the granary can be ventilated and dried. The locking assembly can facilitate the staff to complete the connection or disassembly of the blade plate and the rotating mechanism. When the blade plate is damaged or dirty and needs to be replaced, the blade plate can be quickly replaced by operating the locking assembly to unlock the connection between the blade plate and the rotating mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is a schematic diagram of the overall structure of the utility model.

[0025] Figure 2 The structure diagram of the utility model in one direction is shown (without the cover plate 2).

[0026] Figure 3 It is a schematic diagram of the overall structure of the utility model in one direction.

[0027] Figure 4 It shows a structural schematic diagram of the connection between the lifting mechanism and the rotating mechanism of the utility model.

[0028] Figure 5 Display as Figure 4 Enlarged structural diagram at A in the middle.

[0029] Figure 6 It is a schematic structural diagram of the rotating seat 3.

[0030] Figure 7 It is a schematic diagram of the structure when the first rotating shaft 602 and the locking assembly are connected.

[0031] Figure 8 Shown is a schematic diagram of the locking assembly.

[0032] Fig. 9 It is a schematic diagram of the structure of the connection between the lifting mechanism and the rotating mechanism (without the rotating seat 3 and the blade plate 4).

[0033] Component number description

[0034] Among them: ventilation pipe 1, cover plate 2, buckling groove 201, rotating seat 3, through area 301, annular groove area 302, socket 303, blade plate 4, lifting mechanism 5, lifting platform 501, rack 502, gear 503, second motor 504, rotating mechanism 6, first motor 601, first rotating shaft 602, notch 6021, second rotating shaft 7, first L-shaped part 8, second L-shaped part 9, reinforcing plate 10, mounting plate 11, movable plate 12. DETAILED DESCRIPTION

[0035] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0036] See also Figures 1 to 9 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0037] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0038] See also Figure 1-9 The utility model provides a valve for a ventilation duct, comprising a ventilation pipe 1, a cover plate 2, a rotating seat 3, a blade plate 4, a lifting mechanism 5, a rotating mechanism 6, a locking assembly and a movable plate 12;

[0039] The two ends of the ventilation pipe 1 are connected, and an opening is provided at the top, and a movable opening is provided next to the opening. The movable plate 12 is movably plugged into the movable opening. The movable plate 12 is used to close the ventilation pipe 1. The opening is detachably connected to the cover plate 2. The blade plate 4 is located in the ventilation pipe 1. A plurality of blade plates 4 are arranged in a circumferential array and each blade plate 4 is fixedly connected to the rotating seat 3. The rotating seat 3 is detachably plugged into the rotating mechanism 6. The rotating mechanism 6 is used to drive the rotating seat 3 to rotate. The rotating mechanism 6 is installed on the lifting mechanism 5. After the opening is separated from the cover plate 2, the lifting mechanism 5 can be lifted and lowered to allow the blade plate 4 and the rotating mechanism 6 to enter and exit the opening. After the rotating seat 3 and the rotating mechanism 6 are plugged and connected, the locking assembly locks the two. In this embodiment, the two ends of the ventilation pipe 1 can be designed to the required length, so as to facilitate connection with other pipelines. Specifically, the connection method with other pipelines can be welded or connected using a clamp. In this embodiment, the movable plate 12 can be driven up and down by a multi-stage lifting cylinder to open or close the ventilation pipe 1. The multi-stage lifting cylinder can be an electric cylinder, a pneumatic cylinder or a hydraulic cylinder. In this application, the blade plate and the rotating mechanism can be extended from the open part of the ventilation pipe through the lifting mechanism, so as to facilitate the maintenance or replacement of the blade plate by the staff. In this application, the rotating mechanism and the locking assembly enable the blade plate to rotate normally during operation, so that the interior of the granary can be ventilated and dried. The locking assembly can facilitate the staff to connect or disassemble the blade plate and the rotating mechanism. When the blade plate is damaged or dirty and needs to be replaced, the blade plate can be quickly replaced by operating the locking assembly to unlock the connection between the blade plate and the rotating mechanism.

[0040] In this embodiment, the rotating mechanism 6 includes a first motor 601 and a first rotating shaft 602;

[0041] The first motor 601 is fixedly installed on the lifting mechanism 5, and can be specifically connected to the lifting platform 501 in the lifting mechanism 5 in a fixed and detachable manner by means of anchor bolts and anchor nuts. The purpose of such a design is that when the rotating mechanism 6 extends out from the opening of the ventilation duct 1, the first motor 601 can be easily replaced. One end of the first rotating shaft 602 is fixedly connected to the output shaft of the first motor 601, and the other end is detachably plugged into the rotating seat 3. After the first rotating shaft 602 is plugged into the rotating seat 3, the locking assembly locks the connection between the two.

[0042] In this embodiment, Figures 6 to 8 The rotating seat 3 is provided with a through area 301 in the axial direction, and the end surface of the rotating seat 3 away from the rotating mechanism 6 is provided with an annular groove area 302, the through area 301 is connected with the annular groove area 302, and a notch 6021 is provided at one end of the first rotating shaft 602 away from the first motor 601, and the locking assembly is rotatably mounted on the first rotating shaft 602 and is axially limited;

[0043] When the locking assembly rotates into the notch 6021, the rotating seat 3 and the first rotating shaft 602 can be separated;

[0044] When the locking assembly rotates out of the notch 6021 , the rotating seat 3 and the first rotating shaft 602 cannot be separated.

[0045] In this embodiment, the locking assembly includes a second rotating shaft 7, a first L-shaped member 8, a second L-shaped member 9 and a spring;

[0046] The second rotating shaft 7 is rotatably connected to the first rotating shaft 602 and is axially limited. The vertical section of the first L-shaped member 8 is fixedly connected to the second rotating shaft 7. The horizontal section of the first L-shaped member 8 has an L-shaped cavity. The second L-shaped member 9 is in the L-shaped cavity and can move radially along the second rotating shaft 7. The two ends of the spring are respectively fixedly connected to the second L-shaped member 9 and the second section of the first L-shaped member 8. The rotating seat 3 has a socket 303 connected to the annular groove area 302. The vertical end of the second L-shaped member 9 can be inserted into the socket 303 under the elastic force of the spring. In this embodiment, in order to make the second rotating shaft 7 rotatably connected to the first rotating shaft 602 and axially limited, as shown in FIG. Figure 8 A limiting boss is provided on the second rotating shaft 7, and a limiting groove is provided in the first rotating shaft 602, and the limiting boss rotates in the limiting groove.

[0047] In this embodiment, when the blade plate 4 is replaced, one hand radially moves the second L-shaped member 9 to overcome the elastic force of the spring, and the other hand holds the blade plate 4 to disengage the second L-shaped member 9 from the socket 303, and then the first L-shaped member 8 is rotated. When the first L-shaped member 8 is rotated into the notch 6021, the rotating seat 3 and the first rotating shaft 602 can be separated, that is, the blade plate 4 is replaced, and the installation can be completed by reverse operation during installation. This operation process is very convenient and simple, and the rotating seat 3 and the blade plate 4 can be replaced quickly.

[0048] In this embodiment, Fig. 9 , the lifting mechanism 5 includes a lifting platform 501, a rack 502, a gear 503 and a second motor 504;

[0049] The rotating mechanism 6 is fixedly installed on the lifting platform 501. As mentioned above, the first motor 601 in the rotating mechanism 6 is fixedly installed on the lifting platform 501 by means of anchor bolts and anchor nuts. The lifting platform 501 is slidably connected to the inner wall of the ventilation pipe 1. The lifting platform 501 is fixedly connected to the rack 502. The rack 502 is meshed with the gear 503. The gear 503 is fixedly connected to the output shaft of the second motor 504. The output shaft of the second motor 504 is rotatably installed on the wall of the ventilation pipe 1. The lifting platform 501, the rack 502 and the gear 503 are located in the inner cavity of the ventilation pipe 1. The body of the second motor 504 is fixedly installed on the outer wall of the ventilation pipe 1. In this embodiment, the body of the second motor 504 is fixedly installed on the outer wall of the ventilation pipe 1, which is conducive to the heat dissipation of the second motor 504. The rotation of the second motor 504 drives the rack 502 to move up and down, thereby realizing the lifting and lowering of the lifting platform 501, so that the blade plate 4 can leak out from the open part of the ventilation pipe 1.

[0050] In this embodiment, the two sides of the lifting platform 501 are fixedly connected with sliding protrusions, and sliding grooves are provided at the corresponding positions of the sliding protrusions on the two sides of the inner wall of the ventilation pipe 1, and the sliding protrusions slide in the sliding grooves. In this embodiment, by designing the sliding protrusions and the sliding grooves, the lifting platform 501 can move more smoothly when it is lifted up and down.

[0051] In this embodiment, Figure 3 , further comprising a reinforcing plate 10 and a mounting plate 11, the mounting plate 11 being arranged horizontally, the mounting plate 11 being fixedly connected to the ventilation pipe 1, the second motor 504 being fixedly mounted on the mounting plate 11, the reinforcing plate 10 being arranged obliquely, one end being fixedly connected to the ventilation pipe 1, and the other end being fixedly connected to the mounting plate 11. In this embodiment, the reinforcing plate 10 and the mounting plate 11 are designed to make the installation of the second motor 504 more stable.

[0052] In this embodiment, both the lifting platform 501 and the ventilation pipe 1 are provided with a power socket slot, which is not shown in the figure. In this embodiment, the power socket slot is designed on the lifting platform 501 and the ventilation pipe 1, and specifically, it can be set at the lower end of the ventilation pipe 1. After the first motor 601 is fixedly connected to the lifting platform 501, the power supply plug interface of the first motor 601 is aligned with the power socket slot on the lifting platform 501 and the ventilation pipe 1. When the first motor 601 needs to be powered by an external power cord, the external power cord passes through the power socket slot of the ventilation pipe 1 and the lifting platform 501 in turn and is plugged and unplugged to the power supply plug interface of the first motor 601, thereby completing the power supply to the first motor 601. When the lifting platform 501 needs to rise, the power cord can be unplugged and then the lifting platform 501 can be lifted or lowered.

[0053] In this embodiment, the cover plate 2 is detachably connected to the ventilation pipe 1 by bolts. In this embodiment, the cover plate 2 is designed with four bolt through holes, and the ventilation pipe 1 is provided with four threaded holes at positions corresponding to the bolt through holes. The bolts pass through the bolt through holes of the cover plate 2 and are threadedly connected to the ventilation pipe 1. In this embodiment, the bolt connection facilitates disassembly.

[0054] In this embodiment, buckle grooves 201 are provided at both ends of the cover plate 2. In this embodiment, the buckle grooves 201 are provided, and after the bolts are removed, the cover plate 2 can be conveniently taken out through the buckle grooves 201.

[0055] Working principle of this utility model:

[0056] When the present application is needed to accelerate ventilation inside the granary, first the movable plate 12 is raised to release the sealing of the ventilation pipe 1, and then the first motor 601 is started, and the rotation of the first motor 601 drives the blade plate 4 to rotate, thereby realizing accelerated ventilation and drying inside the granary. When the first motor 601 is damaged and needs to be replaced, or the blade plate 4 is dirty or damaged and needs to be replaced, the cover plate 2 is removed, the power cord electrically connected to the bottom of the ventilation pipe 1 and the first motor 601 is unplugged, and then the second motor 504 is started, and the rotation of the second motor 504 drives the gear 503 to rotate, and the rotation of the gear 503 drives the rack 502 to move up and down, and the rack 502 drives the lifting platform 501 to move up and down, so that the first motor 601 and the blade plate 4 can leak out from the open part of the ventilation pipe 1. If the first motor 601 needs to be replaced, the fixing of the anchor bolts and the anchor nuts can be released. If the blade plate 4 needs to be replaced, when performing the blade plate 4 replacement operation, one hand radially moves the second L-shaped member 9 to overcome the elastic force of the spring, and the other hand holds the blade plate 4 to disengage the second L-shaped member 9 from the socket 303, and then rotates the first L-shaped member 8. When the first L-shaped member 8 is rotated into the notch 6021, the rotating seat 3 and the first rotating shaft 602 can be separated, that is, the blade plate 4 is replaced, and the installation can be achieved by reverse operation during installation.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A valve for a ventilation duct, characterized in that: It comprises a ventilation pipe (1), a cover plate (2), a rotating seat (3), a blade plate (4), a lifting mechanism (5), a rotating mechanism (6), a locking assembly and a movable plate (12); The two ends of the ventilation pipe (1) are connected, and an opening is provided at the top. A movable opening is also provided next to the opening. The movable plate (12) is movably plugged into the movable opening. The movable plate (12) is used to close the ventilation pipe (1). The opening is detachably connected to the cover plate (2). The blade plate (4) is located in the ventilation pipe (1). A plurality of blade plates (4) are arranged in a circumferential array and each blade plate (4) is fixedly connected to the rotating seat (3). The rotating seat (3) is detachably plugged into the rotating mechanism (6). The rotating mechanism (6) is used to drive the rotating seat (3) to rotate. The rotating mechanism (6) is installed on the lifting mechanism (5). After the opening is separated from the cover plate (2), the lifting mechanism (5) can be lifted and lowered to allow the blade plate (4) and the rotating mechanism (6) to enter and exit the opening. After the rotating seat (3) and the rotating mechanism (6) are plugged into and connected, the locking assembly locks the two.

2. A valve for a ventilation duct according to claim 1, characterized in that: The rotating mechanism (6) comprises a first motor (601) and a first rotating shaft (602); The first motor (601) is fixedly mounted on the lifting mechanism (5); one end of the first rotating shaft (602) is fixedly connected to the output shaft of the first motor (601), and the other end is detachably plugged into the rotating seat (3); after the first rotating shaft (602) is plugged into the rotating seat (3), the locking assembly locks the connection between the two.

3. A valve for a ventilation duct according to claim 2, characterized in that: The rotating seat (3) is provided with a through area (301) in the axial direction, and an annular groove area (302) is provided on the end surface of the rotating seat (3) away from the rotating mechanism (6), the through area (301) is communicated with the annular groove area (302), a notch (6021) is provided on the end of the first rotating shaft (602) away from the first motor (601), and the locking assembly is rotatably mounted on the first rotating shaft (602) and is axially limited; When the locking assembly is rotated into the notch (6021), the rotating seat (3) and the first rotating shaft (602) can be separated; When the locking assembly rotates out of the notch (6021), the rotating seat (3) and the first rotating shaft (602) are inseparable.

4. A valve for a ventilation duct according to claim 3, characterized in that: The locking assembly comprises a second rotating shaft (7), a first L-shaped member (8), a second L-shaped member (9) and a spring; The second rotating shaft (7) is rotatably connected to the first rotating shaft (602) and is axially limited; the vertical section of the first L-shaped member (8) is fixedly connected to the second rotating shaft (7); the horizontal section of the first L-shaped member (8) is provided with an L-shaped cavity; the second L-shaped member (9) is in the L-shaped cavity and can move radially along the second rotating shaft (7); the two ends of the spring are respectively fixedly connected to the second L-shaped member (9) and the second section of the first L-shaped member (8); the rotating seat (3) is provided with a socket (303) connected to the annular groove area (302); the vertical end of the second L-shaped member (9) can be inserted into the socket (303) under the elastic force of the spring.

5. A valve for a ventilation duct according to claim 1, characterized in that: The lifting mechanism (5) comprises a lifting platform (501), a rack (502), a gear (503) and a second motor (504); The rotating mechanism (6) is fixedly mounted on the lifting platform (501); the lifting platform (501) is slidably connected to the inner wall of the ventilation pipe (1); the lifting platform (501) is fixedly connected to the rack (502); the rack (502) is meshingly connected to the gear (503); the gear (503) is fixedly connected to the output shaft of the second motor (504); the output shaft of the second motor (504) is rotatably mounted on the wall of the ventilation pipe (1); the lifting platform (501), the rack (502) and the gear (503) are located in the inner cavity of the ventilation pipe (1); and the body of the second motor (504) is fixedly mounted on the outer wall of the ventilation pipe (1).

6. A valve for a ventilation duct according to claim 5, characterized in that: Sliding protrusions are fixedly connected to the two sides of the lifting platform (501), and sliding grooves are provided at positions corresponding to the sliding protrusions on the two sides of the inner wall of the ventilation pipe (1), and the sliding protrusions slide in the sliding grooves.

7. A valve for a ventilation duct according to claim 5, characterized in that: It also comprises a reinforcing plate (10) and a mounting plate (11), wherein the mounting plate (11) is arranged horizontally, the mounting plate (11) is fixedly connected to the ventilation pipe (1), the second motor (504) is fixedly mounted on the mounting plate (11), and the reinforcing plate (10) is arranged obliquely, with one end fixedly connected to the ventilation pipe (1) and the other end fixedly connected to the mounting plate (11).

8. A valve for a ventilation duct according to claim 5, characterized in that: The lifting platform (501) and the ventilation pipe (1) are both provided with a power socket slot.

9. A valve for a ventilation duct according to claim 1, characterized in that: The cover plate (2) and the ventilation pipe (1) are detachably connected via bolts.

10. A valve for a ventilation duct according to claim 9, characterized in that: Buckling grooves (201) are provided at both ends of the cover plate (2).

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