A device for repairing a broken push-through ventilation duct

Abstract

The application provides a kind of patching device for broken forced ventilation duct, including support assembly, paste repair assembly, auxiliary assembly, travel assembly and adhesive tape, the track is provided on the support assembly, the travel assembly is provided on paste repair assembly and auxiliary assembly, the bracket I of paste repair assembly and the bracket II of auxiliary assembly are provided with gyro wheel, when reaching the damaged place, the gear ring movement of differential device is driven by internal high pressure gas impact wind cup speed measuring device, so as to adjust the moving speed of paste repair assembly and auxiliary assembly, make the meeting point of two near the center of damage, the damaged edge is pressed to the adhesive tape below by the slope pressure block of auxiliary assembly, make the inside and surface of repaired damaged place smooth, reduce stress concentration, adapt to flexible ventilation duct material and improve the effect of paste repair.

Description

Technical Field

[0001] This invention relates to the field of pipeline repair technology, specifically a repair device for damaged forced-in ventilation ducts. Background Technology

[0002] The device for repairing damaged water pipes disclosed in CN219809611U includes a working frame. A support component for supporting the water pipe is fixedly connected to one side of the working frame. An adhesive application component is movably connected to the surface of the support component. An adhesive repair component for repairing damaged water pipes is fixedly connected to one side of the support component. The adhesive repair component includes a folding plate fixedly connected to the support component. An adjusting screw rod passes through the surface of the folding plate.

[0003] While the aforementioned existing technologies have enabled the repair of damaged existing pipelines, when the forced ventilation duct is flexible, the publicly available technical documents cannot repair the damaged area. Furthermore, when the ventilation duct is flexible, the damaged area needs to be spliced ​​during repair to avoid stress concentration at the repair site, which could lead to further damage. Summary of the Invention

[0004] The purpose of this invention is to provide a repair device for damaged forced-in ventilation ducts, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A repair device for damaged forced-in ventilation ducts includes a support assembly, an adhesive repair assembly, an auxiliary assembly, a traveling assembly, and adhesive tape. The support assembly has a track, and the adhesive repair assembly and the auxiliary assembly each have a traveling assembly. The bracket I of the adhesive repair assembly and the bracket II of the auxiliary assembly are both equipped with rollers that roll on the track. The adhesive tape shaft of the adhesive repair assembly is slidably mounted on the bracket I, and the adhesive tape is rotatably mounted on the tape shaft, with the outer surface of the tape in contact with the outer surface of the ventilation duct. The blade holder of the adhesive repair assembly is slidably mounted on the bracket I and is parallel to the tape shaft, and a blade is slidably mounted on the blade holder. The bracket II has a slope pressure block.

[0006] Furthermore, the support assembly also includes an outer frame, support rods, hydraulic telescopic rods, and a baffle plate. The outer frame is mounted on the support rods, and two transverse slide rails are arranged parallel to each other on the outer frame. The two ends of the rails are slidably connected to the two transverse slide rails. There are two hydraulic telescopic rods, and the actuators of the two hydraulic telescopic rods are fixedly connected to the two ends of the rails respectively. The fixed ends of the two hydraulic telescopic rods are mounted on the outer frame, and the outer frame is provided with a baffle plate.

[0007] Furthermore, the adhesive repair assembly also includes a first steering rod, spring I, a second steering rod, a pressing rod, and a blocking rod. The first steering rod is rotatably mounted on bracket I, with one end slidably connected to the end of the tape shaft and the other end slidably connected to the end of the blade holder. The tape shaft, the first steering rod, the blade holder, and bracket I form a double slider mechanism based on bracket I. One end of spring I is fixedly connected to the tape shaft and the other end is fixedly connected to bracket I. The second steering rod is rotatably mounted on bracket I. The pressing rod is axially slidably mounted on bracket I, with one end slidably connected to the end of the pressing rod and the other end slidably connected to the end of the blade. The pressing rod, the second steering rod, the blade, and bracket I form a double slider mechanism based on bracket I. The bracket I is provided with a blocking rod to restrict the movement of the tape.

[0008] Furthermore, the auxiliary component also includes a transmission rod and a spring II. The transmission rod is slidably mounted on the bracket II. One end of the spring II is fixedly connected to the bracket II, and the other end is fixedly connected to the transmission rod. A pressure switch is provided on the end face of the transmission rod.

[0009] Furthermore, the traveling component also includes a wind cup speed measuring device and a differential device. The wind cup speed measuring device includes wind cups and a rotating shaft. The number of wind cups is at least three, which are evenly spaced at equal angles in the circumferential direction at the end of the rotating shaft. The differential device includes a motor, a sun gear, planet gears, a planet carrier, and a ring gear. The sun gear is fixed on the motor shaft. The sun gear meshes with the planet gears, and the planet gears mesh with the ring gear. The sun gear and the ring gear are coaxially rotatably connected. The ring gear is poweredly connected to the rotating shaft. The planet gears are rotatably mounted on the planet carrier, and the planet carrier is poweredly connected to the rollers.

[0010] Furthermore, the two rotating shafts are respectively mounted on bracket I and bracket II, and the two motors are respectively fixed on bracket I and bracket II.

[0011] Compared with the prior art, the beneficial effects of the present invention are: This invention controls the relative movement of the adhesive repair component and the auxiliary component through a support component. The adhesive repair component forms an adhesive path on the surface of the ventilation duct using tape. The adhesive repair component and the auxiliary component move synchronously towards the center from two support rods. When they reach the damaged area, the internal high-pressure gas impacts the wind cup speed measuring device, which drives the gear ring of the differential device to move, thereby adjusting the moving speed of the adhesive repair component and the auxiliary component so that the meeting point of the two is located near the center of the damage. Furthermore, the slope pressure block of the auxiliary component presses the damaged edge under the tape, making the interior and surface of the repaired damaged area smooth, reducing stress concentration, adapting to flexible ventilation duct materials, and improving the adhesive repair effect. Attached Figure Description

[0012] Figure 1 This is a three-dimensional schematic diagram of the entire invention; Figure 2 This is a partial view of the supporting components of the present invention; Figure 3 This is a three-dimensional schematic diagram of the adhesive repair component of the present invention; Figure 4 This is a partial view of the back of the repair component of the present invention; Figure 5 This is a three-dimensional schematic diagram of the auxiliary components of the present invention; Figure 6 This is a three-dimensional schematic diagram of the traveling component of the present invention.

[0013] In the diagram: 1 Support assembly, 11 Track, 12 Outer frame, 13 Support rod, 14 Hydraulic telescopic rod, 15 Blocking plate, 16 Transverse slide rail, 2 Adhesive repair assembly, 21 Bracket I, 22 Roller, 23 Adhesive tape shaft, 24 Tool holder, 25 Blade, 26 Spring I, 27 Second steering rod, 28 Pressing rod, 29 Barrier rod, 210 First steering rod, 3 Auxiliary assembly, 31 Bracket II, 32 Slope pressing block, 33 Transmission rod, 34 Spring II, 4 Traveling assembly, 41 Wind cup speed measuring device, 411 Wind cup, 412 Rotating shaft, 42 Differential device, 421 Motor, 422 Sun gear, 423 Planetary gear, 424 Planetary carrier, 425 Gear ring, 5 Adhesive tape. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Please see Figures 1 to 6 This invention provides a technical solution for a repair device for damaged forced-in ventilation ducts: A repair device for a pressurized ventilation duct includes a support assembly 1, an adhesive repair assembly 2, an auxiliary assembly 3, a traveling assembly 4, and adhesive tape 5. The adhesive tape 5 forms a film on the surface of the ventilation duct and simultaneously adhesives the separated damaged parts together. The support assembly 1 is equipped with a track 11. During the adhesive repair process, the adhesive repair assembly 2 and the auxiliary assembly 3 move towards the center from both ends of the track 11. The adhesive repair assembly 2 and the auxiliary assembly 3 are equipped with the traveling assembly 4, which acts as a power source to drive the adhesive repair assembly 2 and the auxiliary assembly 3 towards each other. The support I 21 of the adhesive repair assembly 2 and the support II 31 of the auxiliary assembly 3 are both equipped with rollers 22. The rollers 22 roll on the track 11, providing support for the adhesive repair assembly 2 and the auxiliary assembly 3 to suspend on the track 11 and move along the path defined by the track 11. The adhesive tape shaft 23 of the adhesive repair assembly 2 is slidably mounted on the support I 21. The tape 5 is rotatably mounted on the tape shaft 23, and the surface of the tape 5 is in contact with the surface of the ventilation duct. During the movement of the adhesive repair component 2, due to the adhesive force, the tape 5 is driven to rotate and an adhesive layer of the tape 5 is formed on the surface of the ventilation duct. The knife holder 24 on the adhesive repair component 2 is slidably mounted on the bracket I 21 and is set parallel to the tape shaft 23. The blade 25 is slidably mounted on the knife holder 24. During the movement of the blade 25 on the knife holder 24, it forms a groove on the surface of the tape 5 to cut off the outermost layer of the tape 5, so as to facilitate the separation of the tape 5 from the surface of the ventilation duct. The bracket II 31 is provided with a slope pressure block 32. During the movement of the auxiliary component 3, the slope pressure block 32 presses the surface of the ventilation duct, smooths the material at the damaged area, and facilitates the adhesion of the tape 5. At the damaged area on the other side, the material is naturally flattened and adhered by the movement of the tape 5. The two damaged sides of the material are spliced ​​and adhered near the center of the damaged area.

[0016] In a preferred embodiment, during the winding process, the outer surface of the tape 5 is an adhesive layer and the inner surface is a substrate layer.

[0017] In a preferred embodiment, the track 11 is arc-shaped, and its center of curvature is located on the axis of the ventilation duct.

[0018] In a preferred embodiment, the support assembly 1 further includes an outer frame 12, a support rod 13, a hydraulic telescopic rod 14, and a baffle plate 15. The outer frame 12 is mounted on the support rod 13, which serves as the main support for the entire device, lifting the entire device to the position where repair is required. Two transverse slide rails 16 are arranged parallel to each other on the outer frame 12. The two ends of the track 11 are slidably connected to the two transverse slide rails 16. The track 11 moves along the transverse slide rails 16, which can change the travel trajectory of the adhesive repair assembly 2 and the auxiliary assembly 3. By performing multiple repairs at different positions... The process involves applying adhesive to form an adhesive area on the surface of the ventilation duct, expanding the repair area. There are two hydraulic telescopic rods 14, and the actuators of the two hydraulic telescopic rods 14 are fixedly connected to the two ends of the track 11 respectively. The fixed ends of the two hydraulic telescopic rods 14 are set on the outer frame 12. The hydraulic telescopic rods 14 serve as the power source for the movement and stopping of the track 11. The outer frame 12 is provided with a baffle plate 15. When the auxiliary component 3 moves away from the damaged area and reaches the boundary of the track 11, the baffle plate 15 contacts the transmission rod 33, forcing the transmission rod 33 to move on the bracket II 31.

[0019] In a preferred embodiment, the support rod 13 serves as a support member and can dynamically adjust the specific position of the entire device. The adjustment power can be provided by a hydraulic rod and a motor, which is a common technical feature in the field and will not be described in detail here.

[0020] In a preferred embodiment, the adhesive repair assembly 2 further includes a first steering rod 210, a spring I 26, a second steering rod 27, a pressing rod 28, and a blocking rod 29. The first steering rod 210 is rotatably mounted on the bracket I 21. One end of the first steering rod 210 is slidably connected to the end of the tape shaft 23, and the other end is slidably connected to the end of the tool holder 24. The tape shaft 23, the first steering rod 210, the tool holder 24, and the bracket I 21 form a double slider mechanism with the bracket I 21 as the base, the tape shaft 23 as the driving member, and the tool holder 24 as the driven member. The spring I 27... 6. One end of the tape shaft 23 is fixedly connected, and the other end is fixedly connected to the bracket I 21. Spring I 26 provides elastic force, causing the tape shaft 23 to press the tape 5 against the outer surface of the ventilation duct. As the material wound on the tape 5 decreases with use, the diameter of the entire tape 5 will also decrease, and the tape 5 will tend to detach from the surface of the ventilation duct. Under the action of spring I 26, the tape 5 is continuously kept in contact with the ventilation duct. Since the tape shaft 23, the first steering rod 210, the tool holder 24, and the bracket I 21 are a double slider mechanism, when the tape shaft 23 moves, it drives the tool holder 24 to move in the same direction. The blade 25 moves in the direction of the tape shaft 23, and by controlling the length of the first steering rod 210, the axial displacement of the blade holder 24 is twice that of the tape shaft 23, so that the blade 25 always cuts only the outermost layer of the tape 5. The second steering rod 27 is rotatably mounted on the bracket I 21, and the pressing rod 28 is axially slidably mounted on the bracket I 21. One end of the second steering rod 27 is slidably connected to the end of the pressing rod 28, and the other end is slidably connected to the end of the blade 25. The pressing rod 28, the second steering rod 27, the blade 25, and the bracket I 21 form a structure with the bracket I 21 as the base and the pressing rod 28 as the driving member. The double slider mechanism with blade 25 as the driven member, when the pressing rod 28 contacts the transmission rod 33 and the transmission rod 33 moves under the action of the blocking plate 15, the transmission rod 33 drives the pressing rod 28 to move, the pressing rod 28 drives the blade 25 to move, and the movement of the blade 25 realizes the cutting of the tape 5. The bracket I 21 is provided with a blocking rod 29 to restrict the movement of the tape 5. The blocking rod 29 prevents the tape shaft 23 from moving indefinitely under the action of the spring I 26. It acts as an anchor point to control the position of the outermost edge of the tape 5, ensuring that the tape 5 is always in the outermost position and just in contact with the ventilation duct.

[0021] In a preferred embodiment, the surface of the barrier bar 29 is treated to reduce the adhesive force of the adhesive layer of the tape 5 on it. The specific treatment method can be, but is not limited to, adding a Teflon coating or other methods to reduce surface energy. This treatment method is a common technical feature in the art and will not be described in detail here.

[0022] In a preferred embodiment, the auxiliary component 3 further includes a transmission rod 33 and a spring II 34. The transmission rod 33 is slidably mounted on the bracket II 31. One end of the spring II 34 is fixedly connected to the bracket II 31, and the other end is fixedly connected to the transmission rod 33. The spring II 34 always generates tension. The end face of the transmission rod 33 is provided with a pressure switch. When the pressure rod 28 contacts the transmission rod 33, the motor 421 of the traveling component 4 on the bracket II 31 reverses, causing the moving direction of the auxiliary component 3 to change. The auxiliary component 3 moves synchronously with the adhesive repair component 2.

[0023] In a preferred embodiment, the traveling component 4 further includes a wind cup speed measuring device 41 and a differential device 42. The wind cup speed measuring device 41 includes a wind cup 411 and a rotating shaft 412. The number of wind cups 411 is at least three, evenly spaced at equal angular intervals around the end of the rotating shaft 412. When the auxiliary component 3 and the adhesive repair component 2 move to the edge of the damaged area, the high-pressure gas escaping from the ventilation duct impacts the wind cups 411, causing them to drive the rotating shaft 412 to rotate. The larger the damaged area, the faster the rotation speed of the wind cups 411 and the rotating shaft 412. The differential device 42 includes an electric... The system comprises a motor 421, a sun gear 422, planet gears 423, a planet carrier 424, and a ring gear 425. The sun gear 422 is fixed to the shaft of the motor 421. The sun gear 422 meshes with the planet gears 423, and the planet gears 423 mesh with the ring gear 425. The sun gear 422 and the ring gear 425 are coaxially rotatably connected. The ring gear 425 is powered by a rotating shaft 412. The planet gears 423 are rotatably mounted on the planet carrier 424. The sun gear 422 and the ring gear 425 are the driving components. The power source for the sun gear 422 is the motor 421, and the power source for the ring gear 425 is the rotating shaft 412. The planet carrier 424... As the driven component, the planetary carrier 424 is poweredly connected to the roller 22, transmitting the rotation of the planetary carrier 424 to the roller 22, thereby causing the auxiliary assembly 3 and the adhesive repair assembly 2 to move. When the air cup 411 and the rotating shaft 412 are not rotating, the gear ring 425 is also stationary. The differential device 42 transmits the speed of the motor 421 to the roller 22 at a specific transmission ratio. When the air cup 411 and the rotating shaft 412 rotate, the rotating shaft 412 drives the gear ring 425 to rotate, changing the transmission ratio of the entire differential device 42, changing the rotational speed of the planetary carrier 424 and the roller 22, thereby changing the rotational speed of the auxiliary assembly 3 and the adhesive repair assembly 2 respectively. The moving speed of component 3 and adhesive repair component 2 is controlled. During the process of auxiliary component 3 and adhesive repair component 2 moving towards each other, the faster the rotation speed of the gear ring 425 driven by the rotating shaft 412 is, the slower the moving speed of auxiliary component 3 and adhesive repair component 2 is. Even if auxiliary component 3 and adhesive repair component 2 do not reach the edge of the damaged area at the same time, auxiliary component 3 and adhesive repair component 2 will meet near the center of the damaged area, so that the entire device can be used according to the size and position of the damaged area. When auxiliary component 3 and adhesive repair component 2 move in the same direction, the rotation speed of their respective motors 421 is controlled so that the two work together.

[0024] As a preferred embodiment, the power connection includes, but is not limited to, belt connection methods, such as sprocket drive, gear drive, etc., which are common technical features in the field and will not be described in detail here.

[0025] In a preferred embodiment, two rotating shafts 412 are rotatably mounted on bracket I 21 and bracket II 31 respectively, and two motors 421 are fixed on bracket I 21 and bracket II 31 respectively. The motors 421 control the movement of the auxiliary component 3 and the adhesive repair component 2 respectively.

[0026] The working principle of the present invention: the support component 1 adjusts the support rod 13 to align the adhesive repair component 2 and the auxiliary component 3 with the damaged area. The adhesive repair component 2 and the auxiliary component 3 are located at both ends of the track 11. The tape 5 and the slope pressure block 32 are in contact with the ventilation duct surface. This is the initial state. The motors 421 on the adhesive repair component 2 and the auxiliary component 3 are started, the wind cup 411 and the rotating shaft 412 do not rotate, the adhesive repair component 2 and the auxiliary component 3 move at a certain speed under the action of the differential device 42, the tape 5 contacts the surface of the ventilation duct, and under the action of the adhesive force, the outermost material on the tape 5 continues to adhere to the surface of the ventilation duct. When the adhesive repair component 2 and auxiliary component 3 reach the edge of the damage, the high-pressure gas inside the ventilation duct is released, forming an airflow that drives the cup 411 and the rotating shaft 412 of the cup speed measuring device 41 to rotate. The rotating shaft 412 drives the gear ring 425 to rotate, changing the transmission ratio of the differential device 42 and thus changing the moving speed of the adhesive repair component 2 and auxiliary component 3. Even if the adhesive repair component 2 and auxiliary component 3 do not reach the edge of the damage at the same time, due to the change in speed, the adhesive repair component 2 and auxiliary component 3 will meet near the center of the damage, achieving self-adaptation of the damage position and size. During the process of pasting the repair component 2 and the auxiliary component 3 meeting, the damaged edge on the side of the repair component 2 is automatically pressed and smoothed by the tape 5 rolling on it due to the high pressure inside the ventilation duct. The damaged edge on the side of the auxiliary component 3 is pressed by the slope pressure block 32, and the moving direction of the auxiliary component 3 is from the damaged edge to the damaged center, simultaneously smoothing the damaged edge on that side. At the meeting point of the repair component 2 and the auxiliary component 3, the slope pressure block 32 is located under the tape 5 and the two do not contact each other. At this time, the pressing rod 28 contacts the pressing switch on the transmission rod 33, the motor 421 of the auxiliary component 3 reverses, the auxiliary component 3 moves in the opposite direction, the direction of movement of the adhesive repair component 2 remains unchanged, the auxiliary component 3 and the adhesive repair component 2 move in the same direction, the slope pressing block 32 gradually exits the pressed damaged edge, and the released damaged edge part is adhered by the tape 5. This process continues to achieve adhesive repair of the damaged area, and the repaired damaged joint is smooth and without folds, which reduces the stress concentration effect at the damaged repair area and improves the repair quality. When the adhesive repair component 2 and the auxiliary component 3 move synchronously to the vicinity of the edge of the track 11, the transmission rod 33 contacts the blocking plate 15. During the continuous movement of the adhesive repair component 2 and the auxiliary component 3, the transmission rod 33 drives the pressing rod 28 to move, and the pressing rod 28 drives the blade 25 to move to cut the surface of the tape 5. When the cut-off part is pasted onto the surface of the ventilation duct, the adhesive repair is completed. Adjust the support rod 13 and the hydraulic telescopic rod 14 to change the position of the track 11, perform a second repair on the damaged area, and continue for multiple cycles to repair the damaged area.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A repair device for a damaged forced-in ventilation duct, comprising a support assembly (1), an adhesive repair assembly (2), an auxiliary assembly (3), a traveling assembly (4), and tape (5), wherein the support assembly (1) is provided with a track (11), and the adhesive repair assembly (2) and the auxiliary assembly (3) are provided with the traveling assembly (4), characterized in that: The bracket I (21) of the adhesive repair component (2) and the bracket II (31) of the auxiliary component (3) are both equipped with rollers (22). The rollers (22) roll on the track (11). The tape shaft (23) of the adhesive repair component (2) is slidably mounted on the bracket I (21). The tape (5) is rotatably mounted on the tape shaft (23). The outer surface of the tape (5) is in contact with the outer surface of the ventilation duct. The knife holder (24) on the adhesive repair component (2) is slidably mounted on the bracket I (21) and is parallel to the tape shaft (23). The blade (25) is slidably mounted on the knife holder (24). The bracket II (31) is equipped with a slope pressure block (32).

2. The repair device for a damaged forced-in ventilation duct according to claim 1, characterized in that: The support assembly (1) also includes an outer frame (12), a support rod (13), a hydraulic telescopic rod (14), and a baffle plate (15). The outer frame (12) is mounted on the support rod (13). Two transverse slide rails (16) are arranged in parallel on the outer frame (12). The two ends of the track (11) are slidably connected to the two transverse slide rails (16). There are two hydraulic telescopic rods (14). The actuators of the two hydraulic telescopic rods (14) are fixedly connected to the two ends of the track (11), respectively. The fixed ends of the two hydraulic telescopic rods (14) are mounted on the outer frame (12). The outer frame (12) is provided with a baffle plate (15).

3. The repair device for a damaged forced-in ventilation duct according to claim 2, characterized in that: The adhesive repair assembly (2) further includes a first steering rod (210), a spring I (26), a second steering rod (27), a pressing rod (28), and a blocking rod (29). The first steering rod (210) is rotatably mounted on the bracket I (21). One end of the first steering rod (210) is slidably connected to the end of the tape shaft (23) and the other end is slidably connected to the end of the knife holder (24). One end of the spring I (26) is fixedly connected to the tape shaft (23) and the other end is fixedly connected to the bracket I (21). The second steering rod (27) is rotatably mounted on the bracket I (21). The pressing rod (28) is axially slidably mounted on the bracket I (21). One end of the second steering rod (27) is slidably connected to the end of the pressing rod (28) and the other end is slidably connected to the end of the blade (25). The bracket I (21) is provided with a blocking rod (29) to restrict the movement of the tape (5).

4. The repair device for a damaged forced-in ventilation duct according to claim 3, characterized in that: The auxiliary component (3) also includes a transmission rod (33) and a spring II (34). The transmission rod (33) is slidably mounted on the bracket II (31). One end of the spring II (34) is fixedly connected to the bracket II (31) and the other end is fixedly connected to the transmission rod (33). The end face of the transmission rod (33) is provided with a pressure switch.

5. The repair device for a damaged forced-in ventilation duct according to claim 4, characterized in that: The traveling component (4) further includes a wind cup speed measuring device (41) and a differential device (42). The wind cup speed measuring device (41) includes wind cups (411) and a rotating shaft (412). The number of wind cups (411) is at least three, which are evenly spaced at equal angles around the end of the rotating shaft (412). The differential device (42) includes a motor (421), a sun gear (422), planet gears (423), a planet carrier (424), and a gear ring (425). 25), the sun gear (422) is fixed on the shaft of the motor (421), the sun gear (422) meshes with the planet gear (423), the planet gear (423) meshes with the gear ring (425), the sun gear (422) and the gear ring (425) are coaxially rotatably connected, the gear ring (425) is poweredly connected to the rotating shaft (412), the planet gear (423) is rotatably mounted on the planet carrier (424), and the planet carrier (424) is poweredly connected to the roller (22).

6. The repair device for a damaged forced-in ventilation duct according to claim 5, characterized in that: Two rotating shafts (412) are rotatably mounted on bracket I (21) and bracket II (31) respectively, and two motors (421) are fixed on bracket I (21) and bracket II (31) respectively.

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