A fabricated ventilation duct component

Abstract

The application relates to an assembled ventilation pipeline component, belonging to the technical field of ventilation pipelines, which comprises a hanger rod for being fixed on a roof and a supporting plate arranged on the hanger rod and used for receiving a ventilation pipeline, the supporting plate is reciprocally and slidably arranged on the hanger rod, the sliding direction of the supporting plate is perpendicular to the length direction of the hanger rod, the ventilation pipeline component further comprises an elastic member, the elastic member is used for driving the supporting plate to slide in the direction opposite to the sliding direction of the ventilation pipeline when the ventilation pipeline drives the supporting plate to slide; a through hole for the sliding of the supporting plate is arranged on the hanger rod, a ball is rotatably arranged on the hanger rod and located in the through hole, and the plate surface of the supporting plate is received on the ball. The application has the effect of improving the stability of the ventilation pipeline.

Description

Technical Field

[0001] This application relates to the field of ventilation duct technology, and in particular to a prefabricated ventilation duct component. Background Technology

[0002] With the continuous development of technology and transportation, subways have become popular in major cities and have become one of the main means of transportation for people. Most subways with existing technology are built underground. Due to poor ventilation underground, the air inside the subway station will be turbid. Therefore, ventilation ducts need to be planned in the subway station during the construction planning period.

[0003] When installing ventilation ducts indoors, the process usually involves first fixing several hangers to the roof, forming two rows of hangers. Then, a support plate is installed at the bottom of the hangers to connect the two rows of hangers. Finally, the ventilation duct is placed between the two rows of hangers to complete the installation of a single ventilation duct section. The remaining duct sections are then connected axially according to the subway route, and bolts are used to reinforce the connection between adjacent ventilation ducts.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: During the use of ventilation ducts, rapid airflow will cause the support plate to sway, and the swaying of the support plate will cause the hanger rod to sway. Since the hanger rod is usually fixed to the roof with bolts, when the hanger rod sways, it is easy to cause a large gap between the bolt and the roof, which will cause the bolt to detach from the roof and thus cause the ventilation duct to fall. Summary of the Invention

[0005] To improve the stability of ventilation ducts, this application provides a prefabricated ventilation duct component.

[0006] The prefabricated ventilation duct component provided in this application adopts the following technical solution:

[0007] A prefabricated ventilation duct component includes a hanger rod for fixing to the roof and a support plate mounted on the hanger rod for supporting the ventilation duct. The support plate is slidably mounted on the hanger rod, and the sliding direction of the support plate is perpendicular to the length direction of the hanger rod. The ventilation duct component also includes an elastic element, which drives the support plate to slide in the opposite direction to the sliding direction of the ventilation duct when the ventilation duct moves the support plate. The hanger rod has a through hole for the support plate to slide through, and a ball bearing is rotatably mounted on the hanger rod and located in the through hole. The surface of the support plate rests on the ball bearing.

[0008] By adopting the above technical solutions, when the ventilation duct is supplying air, the rapidly flowing air causes the ventilation duct to sway, and the ventilation duct causes the support plate to slide on the hanger. This, to a certain extent, isolates the kinetic energy transfer between the support plate and the hanger, thereby reducing the degree of hanger sway and the possibility of the hanger detaching from the roof, thus improving the stability of the ventilation duct. Under the action of the elastic element, the sliding range of the support plate is limited, reducing the possibility of the support plate sliding off the hanger, thus reducing the possibility of the support plate falling, further improving the stability of the ventilation duct. Under the action of the ball bearings, the sliding friction between the support plate and the hanger is converted into rolling friction between the support plate and the ball bearings, further reducing the possibility of the kinetic energy of the support plate being transferred to the hanger, further reducing the degree of hanger sway, and at the same time reducing the noise generated by the friction between the support plate and the hanger during the sliding process. Furthermore, it reduces the possibility of wear on the contact surface of the support plate and the hanger, reducing the possibility of damage to the support plate and the hanger.

[0009] Optionally, the elastic element includes a spring and a fixed plate disposed on the support plate. The spring is located between the hanger and the fixed plate and abuts against the hanger and the fixed plate. The length direction of the spring is parallel to the length direction of the support plate, and the spring is in a compressed state.

[0010] By adopting the above technical solution, the sliding distance of the support plate is reduced during the sliding process under the action of the spring, thereby reducing the possibility of the support plate falling. Furthermore, under the action of the spring force, the support plate tends to maintain its position between the hangers, further improving the stability of the support plate. At the same time, the spring has the advantages of simple structure and long service life.

[0011] Optionally, the support plate has a notch that penetrates the bearing surface and bottom surface of the support plate. The fixing plate is rotatably disposed within the notch, and the rotation axis of the fixing plate is perpendicular to the length direction of the support plate. A connector is provided on the surface of the fixing plate. The spring is fixedly disposed on the suspension rod, and the end of the spring away from the suspension rod is inserted into the connector. A sliding rod is slidably disposed on the connector, and the side of the sliding rod that is inserted into the connector and fixes the spring sleeved on the connector to the connector.

[0012] By adopting the above technical solution, during the installation of the support plate on the hanger rod, the fixed plate is rotated and stored in the notch, thus facilitating the support plate to enter the notch and cross over to another hanger rod. Then, the end of the spring is inserted into the connector, and the sliding rod is slid to lock the spring onto the connector, completing the installation of the support plate. This reduces the impact of the fixed plate on the installation of the support plate. At the same time, the fixed plate facilitates the installation of the spring. Furthermore, the fixed plate also prevents the support plate from sliding down.

[0013] Optionally, the rotation axis of the fixed plate is located on the center line of the fixed plate, and a counterweight is provided at the end of the fixed plate near the ground, the counterweight driving the fixed plate to a vertical state.

[0014] By adopting the above technical solution, the fixed plate is driven to a vertical state under the action of the counterweight, which makes it easier for the spring to drive the support plate to maintain its initial position; at the same time, the blocking effect of the fixed plate on the support plate is improved.

[0015] Optionally, a mounting plate is slidably disposed on the rod and located within the through hole, the sliding direction of the mounting plate being parallel to the length direction of the rod, the ball bearings being rotatably disposed on the mounting plate, and a driving component for driving the mounting plate to slide is provided on the rod.

[0016] By adopting the above technical solution, after the support plate enters the hanger rod, the mounting plate is driven to slide by the driving component. The sliding of the mounting plate causes the ball bearings to slide and abut against the surface of the support plate, thereby ensuring the effective connection between the ball bearings and the support plate and reducing the possibility of the support plate moving within the notch. Furthermore, it facilitates the installation of mounting plates of different thicknesses onto the hanger rod.

[0017] Optionally, the boom has two mounting plates, located on opposite sides of the support plate and bottom surface, respectively. The driving component includes a screw threaded into the boom, with each screw corresponding to a mounting plate. The length of the screw is parallel to the length of the boom. The mounting plate is rotatably mounted at the end of the screw. The driving component also includes a driving rod rotatably mounted on the boom and a connecting rod rotatably mounted inside the boom. There are two connecting rods, with the length of the driving rod perpendicular to the length of the boom and the length of the connecting rod parallel to the length of the boom. The driving rod is located between the two connecting rods. The ends of the driving rod and the two connecting rods that are close to each other are provided with meshing bevel gears. The driving component also includes a conveyor belt disposed between the connecting rod and the screw, with both the connecting rod and the screw wound around the conveyor belt.

[0018] By adopting the above technical solution, when the mounting plate slides and the ball bearings press against the support plate, the drive rod is rotated. Under the action of the bevel gear, the drive rod rotates and drives the connecting rod to rotate. The rotating connecting rod drives the conveyor belt to run. The running of the conveyor belt drives the screw to rotate. The rotating screw moves inside the hanger, thereby driving the mounting plate to slide towards the support plate. The operation is simple and convenient. At the same time, the screw drive makes it easy to fix the mounting plate at any point to facilitate the contact between the ball bearings and the support plate.

[0019] Optionally, the fixing plates are located on both sides of the suspension rod and are symmetrically distributed along the suspension rod.

[0020] By adopting the above technical solution, the fixed plates on both sides of the boom increase the points of action of the spring, which makes it easier for the support plate to maintain its initial position, reduces the degree of slippage of the support plate, and thus reduces the degree of swaying of the boom caused by the support plate.

[0021] Optionally, a connecting rope is fixedly installed inside the boom. The free end of the connecting rope is moved out of the boom through a notch and fixedly connected to the support plate. The length of the connecting rope inside the notch is greater than the maximum sliding distance of the support plate.

[0022] By adopting the above technical solution, the opening of the gap disrupts the integrity of the hanger rod, making the lower part of the hanger rod supporting the support plate prone to breakage. Under the action of the connecting rope, when the hanger rod breaks, the connecting rope suspends the support plate, reducing the possibility of the support plate falling and thus improving the stability of the ventilation duct.

[0023] Optionally, an airbag is provided on the bearing surface of the support plate, and the ventilation duct is supported on the airbag.

[0024] By adopting the above technical solution, the ventilation duct is supported on the airbag, and the airbag plays a certain role in offsetting the swaying of the ventilation duct, thereby reducing the kinetic energy of the ventilation duct transferred to the support plate, and thus reducing the swaying of the support plate.

[0025] Optionally, the airbag is provided with multiple flexible plates, which are arranged at intervals within the airbag. The flexible plates divide the inner cavity of the airbag into multiple bladders, which are laid flat on a support plate. An air core is provided between adjacent bladders.

[0026] By adopting the above technical solution, multiple bladders improve the stability of the ventilation duct. When one bladder is damaged, the remaining bladders support the ventilation duct, thereby buffering the shaking of the ventilation duct. Under the action of the air core, the bladders are conveniently inflated and collide to support the ventilation duct.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. When the ventilation duct is supplying air, the rapidly flowing air causes the ventilation duct to sway. This causes the ventilation duct to move the support plate along the hanger, which to some extent interrupts the kinetic energy transfer between the support plate and the hanger, thereby reducing the degree of swaying of the hanger and the possibility of the hanger falling off the roof, thus improving the stability of the ventilation duct. Under the action of the elastic element, the sliding range of the support plate is limited, reducing the possibility of the support plate sliding off the hanger, thus reducing the possibility of the support plate falling off, further improving the stability of the ventilation duct.

[0029] 2. Under the action of the ball bearings, the sliding friction between the support plate and the rod is transformed into rolling friction between the support plate and the ball bearings, which further reduces the possibility of the kinetic energy of the support plate being transferred to the rod, further reduces the degree of swaying of the rod, and at the same time reduces the noise generated by the friction between the support plate and the rod during the sliding process of the support plate; furthermore, it reduces the possibility of wear on the contact surface of the support plate and the rod, and reduces the possibility of damage to the support plate and the rod. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the usage structure of a prefabricated ventilation duct component according to an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the overall structure of a prefabricated ventilation duct component according to an embodiment of this application;

[0032] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle;

[0033] Figure 4 This is a side view of a prefabricated ventilation duct component according to an embodiment of this application;

[0034] Figure 5 yes Figure 4 Enlarged schematic diagram of part B in the middle;

[0035] Figure 6 This is a cross-sectional view of an assembled ventilation duct component according to an embodiment of this application;

[0036] Figure 7 yes Figure 6 An enlarged schematic diagram of section C.

[0037] Explanation of reference numerals in the attached drawings: 1. Hanging rod; 2. Ventilation duct; 3. Support plate; 4. U-bolt; 5. Through hole; 6. Spring; 7. Fixing plate; 8. Ball bearing; 9. Notch; 10. Hinge shaft; 11. Plug joint; 12. Slide rod; 13. Counterweight; 14. Mounting plate; 15. Screw; 16. Drive rod; 17. Connecting rod; 18. Bevel gear; 19. Conveyor belt; 20. Connecting rope; 21. Airbag; 211. Bag body; 22. Flexible plate; 23. Air core. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0039] This application discloses a prefabricated ventilation duct component. (Refer to...) Figure 1 and Figure 2The prefabricated ventilation duct component includes a hanger 1 for fixing to the roof and a support plate 3 set on the hanger 1 for supporting the ventilation duct 2. In this embodiment, both the hanger 1 and the support plate 3 are plate-shaped. There are two hangers 1, and the support plate 3 is located between the two hangers 1 and spans across the hangers 1. The ventilation duct 2 is fixed to the support plate 3 by U-bolts 4. In this embodiment, the support plate 3 is slidably mounted on the hanger 1. The sliding direction of the support plate 3 is perpendicular to the length direction of the hanger 1. Through holes 5 for the support plate 3 to slide are opened on the faces of the two hangers 1 facing each other. The through holes 5 are rectangular holes. During the ventilation process, when the ventilation duct 2 slides back and forth on the support plate 3 under the action of air, the ventilation duct 2 drives the support plate 3 to slide back and forth on the hanger 1, thereby reducing the possibility of the support plate 3 causing the hanger 1 to sway, and thus reducing the possibility of the hanger 1 falling off the roof.

[0040] Reference Figure 2 and Figure 3 To reduce the slippage of the support plate 3, the ventilation duct component also includes an elastic element. This elastic element, used when the ventilation duct 2 drives the support plate 3 to slide, causes the support plate 3 to slide in the opposite direction to the sliding direction of the ventilation duct 2. The elastic element includes a spring 6 and a fixed plate 7 disposed on the support plate 3. The spring 6 is located between the hanger 1 and the fixed plate 7, and abuts against both the hanger 1 and the fixed plate 7. The length direction of the spring 6 is parallel to the length direction of the support plate 3, and the spring 6 is in a compressed state. In this compressed state, the spring 6 accumulates potential energy, allowing the support plate 3 to maintain its initial position, thereby reducing the slippage of the support plate 3. Simultaneously, when the support plate 3 slides to one side, the elastic force of the spring 6 pulls the support plate 3 back to its initial position, reducing the possibility of the support plate 3 detaching from the hanger 1. In other embodiments, the spring 6 can be replaced with a stretched state.

[0041] Reference Figure 4 and Figure 5 To further reduce the sway of the support plate 3 and the suspension rod 1, a ball bearing 8 is rotatably installed on the suspension rod 1 and inside the through hole 5, and the surface of the support plate 3 is supported on the ball bearing 8. Under the action of the ball bearing 8, the support plate 3 and the suspension rod 1 are separated from each other, making it difficult for the kinetic energy of the support plate 3 to be transmitted to the suspension rod 1, thereby reducing the sway of the suspension rod 1.

[0042] Reference Figure 6 and Figure 7To facilitate the installation of the support plate 3 on the hanger rod 1, a notch 9 is provided on the support plate 3. The notch 9 penetrates the bearing surface and the bottom surface of the support plate 3. The notch 9 is rectangular. The fixing plate 7 is rotatably set in the notch 9. The fixing plate 7 is a rectangular plate. Hinges 10 are fixedly installed on the two opposite side walls of the fixing plate 7. The hinges 10 are rotatably set in the side walls of the notch 9. The rotation axis of the fixing plate 7 is perpendicular to the length direction of the support plate 3. During the installation of the support plate 3, the fixing plate 7 is rotated and stored in the notch 9. Then the support plate 3 is inserted into the hanger rod 1 to complete the installation of the support plate 3.

[0043] Reference Figure 2 and Figure 3 In this embodiment, a connector 11 is provided on the surface of the fixing plate 7. The connector 11 is cylindrical and its diameter is equal to that of the spring 6. The spring 6 is fixedly mounted on the hanging rod 1. The end of the spring 6 away from the hanging rod 1 is inserted into the connector 11. Furthermore, a sliding rod 12 is slidably mounted on the connector 11. The side of the sliding rod 12 that is inserted into the connector 11 and has the spring 6 sleeved on the connector 11 is fixed on the connector 11. After the support plate 3 is slidably mounted through the hanging rod 1, the spring 6 is sleeved on the connector 11. Then, the sliding rod 12 is inserted into the connector 11 to fix the spring 6 on the fixing plate 7, thereby facilitating the driving of the support plate 3 to the initial position.

[0044] Reference Figure 2 and Figure 3 Furthermore, the rotation axis of the fixed plate 7 is located on the center line of the fixed plate 7, the connection point between the hinge shaft 10 and the fixed plate 7 is located on the lateral center line of the fixed plate 7, and a counterweight 13 is provided at the end of the fixed plate 7 near the ground. The counterweight 13 drives the fixed plate 7 to a vertical state. Under the action of the counterweight 13, the fixed plate 7 is in a vertical state, which facilitates the installation of the spring 6. At the same time, it increases the difficulty of rotating the fixed plate 7, so that the spring 6 can drive the support plate 3 to the initial state.

[0045] Reference Figure 2 and Figure 3 In this embodiment, the fixing plate 7 is located on both sides of the hanger 1 and is symmetrically distributed along the hanger 1; the symmetrical distribution of the fixing plate 7 on both sides of the hanger 1 makes it easier for the springs 6 on both sides of the hanger 1 to limit the position of the support plate 3, thereby making it easier for the support plate 3 to return to its initial position.

[0046] Reference Figure 6 and Figure 7To facilitate an effective connection between the ball bearings 8 and the support plate 3, a mounting plate 14 is slidably provided on the rod 1 and inside the through hole 5. Two mounting plates 14 are provided, located on the sides of the support plate 3 and the bottom surface, respectively. The sliding direction of the mounting plate 14 is parallel to the length direction of the rod 1. Multiple ball bearings 8 are provided, and the ball bearings 8 are rotatably mounted on the mounting plate 14. A driving component is provided on the rod 1 to drive the mounting plate 14 to slide.

[0047] Reference Figure 6 and Figure 7 The driving component includes a screw 15 threadedly connected to the lifting rod 1, with each screw 15 corresponding to a mounting plate 14. The length direction of the screw 15 is parallel to the length direction of the lifting rod 1. The mounting plate 14 is rotatably disposed at the end of the screw 15. The driving component also includes a driving rod 16 rotatably disposed on the lifting rod 1 and a connecting rod 17 rotatably disposed inside the lifting rod 1. There are two connecting rods 17, each corresponding to a screw 15. The length direction of the driving rod 16 is perpendicular to the length direction of the lifting rod 1. One end of the driving rod 16 is located inside the lifting rod 1, and the other end is located outside the lifting rod 1. The length direction of the connecting rod 17 is parallel to the length direction of the lifting rod 1. The driving rod 16 is located between the two connecting rods 17, and its length direction is perpendicular to the length direction of the connecting rods 17. The ends of the driving rod 16 and the two connecting rods 17 that are close to each other are provided with meshing bevel gears 18. The driving component also includes a conveyor belt 19 disposed between the connecting rods 17 and the screw 15, with both the connecting rods 17 and the screw 15 wound around the conveyor belt 19.

[0048] When the mounting plate 14 drives the roller to abut against the support plate 3, the drive rod 16 is rotated. The drive rod 16 drives the bevel gear 18 to rotate. The rotation of the bevel gear 18 drives the connecting rod 17 to rotate. The rotation of the connecting rod 17 drives the conveyor belt 19 to run. The running of the conveyor belt 19 drives the screw 15 to rotate. The rotation of the screw 15 drives the mounting plate 14 to slide towards the support plate 3, and makes the support plate 3 located in the middle of the notch 9, thereby completing the abutment between the ball 8 and the support plate 3.

[0049] In this embodiment, multiple grooves are formed on the surface of the support plate 3. The length direction of the grooves is parallel to the length direction of the support plate 3, and the ball bearing 8 is rolled and engaged in the groove. Under the action of the groove, the possibility of the mounting plate 14 shifting is reduced, thereby reducing the possibility of the ball bearing 8 falling off the support plate 3.

[0050] Reference Figure 6 and Figure 7To reduce the possibility of the support plate 3 falling after the suspension rod 1 is damaged, a connecting rope 20 is fixedly installed inside the suspension rod 1. The free end of the connecting rope 20 moves out of the suspension rod 1 through the notch 9 and is fixedly connected to the support plate 3. Furthermore, the connecting rope 20 passes through the mounting plate 14, and the length of the connecting rope 20 inside the notch 9 is greater than the maximum sliding distance of the support plate 3. The connecting rope 20 is a steel wire rope. When the suspension rod 1 breaks or is damaged at the notch 9, the support plate 3 is suspended on the suspension rod 1 by the action of the connecting rope 20, which reduces the possibility of the support plate 3 falling and thus improves the stability of the ventilation duct 2.

[0051] Reference Figure 6 To further cushion the swaying of the ventilation duct 2, an airbag 21 is provided on the bearing surface of the support plate 3, and the ventilation duct 2 is supported on the airbag 21. The airbag 21 cushions the swaying of the ventilation duct 2 and, to a certain extent, interrupts the path of the vibration of the ventilation duct 2 to the support plate 3, thereby reducing the degree of swaying of the support plate 3.

[0052] Reference Figure 6 To improve the cushioning effect of the airbag 21 on the ventilation duct 2, multiple flexible plates 22 are provided inside the airbag 21. In this embodiment, the flexible plates 22 are made of the same material as the airbag 21 and are arranged at intervals inside the airbag 21. The flexible plates 22 divide the inner cavity of the airbag 21 into multiple bladders 211. The multiple bladders 211 are laid flat on the support plate 3, and air cores 23 are provided between adjacent bladders 211. The multiple bladders 211 ensure the cushioning effect of the airbag 21 on the ventilation duct 2. At the same time, when a bladder 211 is damaged, the remaining bladders 211 support the ventilation duct 2, further improving the cushioning effect on the ventilation duct 2.

[0053] The implementation principle of a prefabricated ventilation duct component in this application embodiment is as follows:

[0054] After the hanger rod 1 is installed on the roof, rotate the fixing plate 7 to store the fixing plate 7 in the notch 9, and then insert the support plate 3 into the hanger rod 1.

[0055] Rotating the drive rod 16 causes the bevel gear 18 to rotate, which in turn causes the connecting rod 17 to rotate. The rotating connecting rod 17 then drives the conveyor belt 19, which in turn drives the screw 15 to rotate. The rotating screw 15 causes the mounting plate 14 to slide towards the support plate 3, positioning the support plate 3 at the center of the notch 9. This completes the connection between the ball bearing 8 and the support plate 3, thus completing the installation of the support plate 3.

[0056] During the ventilation process, as the ventilation duct 2 slides back and forth on the support plate 3 under the influence of air, the ventilation duct 2 drives the support plate 3 to slide back and forth on the hanger 1, thereby reducing the possibility of the support plate 3 causing the hanger 1 to sway, and thus reducing the possibility of the hanger 1 falling off the roof.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prefabricated ventilation duct component, comprising a hanger (1) for fixing to the roof and a support plate (3) disposed on the hanger (1) for supporting a ventilation duct (2), characterized in that: The support plate (3) is reciprocally slidably mounted on the hanger (1). The sliding direction of the support plate (3) is perpendicular to the length direction of the hanger (1). The ventilation duct component also includes an elastic element. The elastic element is used to drive the support plate (3) to slide in the opposite direction to the sliding direction of the ventilation duct (2) when the ventilation duct (2) drives the support plate (3) to slide. The hanger (1) has a through hole (5) for the support plate (3) to slide. A ball bearing (8) is rotatably mounted on the hanger (1) and located in the through hole (5). The plate surface of the support plate (3) is supported on the ball bearing (8). The elastic element includes a spring (6) and a fixed plate (7) disposed on the support plate (3). The spring (6) is located between the rod (1) and the fixed plate (7) and abuts against the rod (1) and the fixed plate (7). The length direction of the spring (6) is parallel to the length direction of the support plate (3). The spring (6) is in a compressed state. The support plate (3) has a notch (9) that penetrates the bearing surface and bottom surface of the support plate (3). The fixing plate (7) is rotatably disposed in the notch (9). The rotation axis of the fixing plate (7) is perpendicular to the length direction of the support plate (3). A connector (11) is provided on the plate surface of the fixing plate (7). The spring (6) is fixedly disposed on the rod (1). The end of the spring (6) away from the rod (1) is inserted into the connector (11). A sliding rod (12) is slidably disposed on the connector (11). The side of the sliding rod (12) inserted into the connector (11) and the side on which the spring (6) is sleeved on the connector (11) is fixed on the connector (11). The rotation axis of the fixed plate (7) is located on the center line of the fixed plate (7). A counterweight (13) is provided at the end of the fixed plate (7) near the ground. The counterweight (13) drives the fixed plate (7) to be in a vertical state.

2. The prefabricated ventilation duct component according to claim 1, characterized in that: A mounting plate (14) is slidably disposed on the rod (1) and located in the through hole (5). The sliding direction of the mounting plate (14) is parallel to the length direction of the rod (1). The ball bearing (8) is rotatably disposed on the mounting plate (14). A driving member for driving the mounting plate (14) to slide is provided on the rod (1).

3. A prefabricated ventilation duct component according to claim 2, characterized in that: Two mounting plates (14) are provided on the boom (1), and the two mounting plates (14) are respectively located on the two sides of the support plate (3) and the bottom surface. The driving component includes a screw (15) threadedly connected in the boom (1). The screw (15) corresponds one-to-one with the mounting plate (14). The length direction of the screw (15) is parallel to the length direction of the boom (1). The mounting plate (14) is rotatably disposed at the end of the screw (15). The driving component also includes a driving rod (16) rotatably disposed on the boom (1) and a connecting rod (17) rotatably disposed in the boom (1). The connecting rod (17) is provided in two parts. The length direction of the driving rod (16) is perpendicular to the length direction of the lifting rod (1), and the length direction of the connecting rod (17) is parallel to the length direction of the lifting rod (1). The driving rod (16) is located between the two connecting rods (17). The ends of the driving rod (16) and the two connecting rods (17) that are close to each other are provided with bevel gears (18) that mesh with each other. The driving component also includes a conveyor belt (19) provided between the connecting rod (17) and the screw (15). The connecting rod (17) and the screw (15) are both wound around the conveyor belt (19).

4. A prefabricated ventilation duct component according to claim 1, characterized in that: The fixing plate (7) is located on both sides of the rod (1) and is symmetrically distributed along the rod (1).

5. A prefabricated ventilation duct component according to claim 1, characterized in that: A connecting rope (20) is fixedly installed inside the boom (1). The free end of the connecting rope (20) moves out of the boom (1) through the notch (9) and is fixedly connected to the support plate (3). The length of the connecting rope (20) inside the notch (9) is greater than the maximum sliding distance of the support plate (3).

6. A prefabricated ventilation duct component according to claim 1, characterized in that: An airbag (21) is provided on the bearing surface of the support plate (3), and the ventilation duct (2) is supported on the airbag (21).

7. A prefabricated ventilation duct component according to claim 6, characterized in that: The airbag (21) is provided with a plurality of flexible plates (22), which are arranged at intervals in the airbag (21). The flexible plates (22) divide the inner cavity of the airbag (21) into a plurality of bladders (211). The plurality of bladders (211) are laid flat on the support plate (3), and air cores (23) are provided between adjacent bladders (211).

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