A telescopic cleaning robot for circular ventilation ducts

Abstract

The present invention provides a telescopic cleaning robot for circular ventilation ducts, comprising a main body control device, a plurality of walking devices, an umbrella-shaped telescopic device, a monitoring device and a cleaning device; the cleaning device is installed at the front end of the main body control device, the umbrella-shaped telescopic device is installed at the rear end of the main body control device, the plurality of walking devices are installed on the circumferential side walls of the main body control device, and the monitoring device is installed at the front and rear ends of the main body control device; the cleaning device comprises a brush shaft rotatably connected to the front end of the main body control device, and a cleaning brush is mounted at the front end of the brush shaft. The robot can meet the cleaning needs of circular ventilation ducts of various specifications, reduce the cost and trouble of equipping different ducts with different cleaning equipment, can walk freely in horizontal and vertical ducts, break through the limitations of traditional cleaning equipment in terms of duct direction, can monitor the cleaning situation in the duct in real time, and realize efficient dirt removal.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline cleaning, and in particular to a telescopic cleaning robot for a circular ventilation duct. Background Art

[0002] Ventilation ducts play a vital role in the ventilation and air conditioning system of buildings. However, due to the complex internal environment of ventilation ducts, the small space and the fact that they are usually difficult to directly access, pollutants such as dirt, bacteria and fungi are easily accumulated on the inner wall of the ducts, which not only affects the ventilation effect, but may also have a serious impact on the indoor air quality.

[0003] At present, common ventilation duct cleaning methods mainly include manual cleaning and simple mechanical cleaning devices. Manual cleaning requires workers to enter the interior of the duct, which has a harsh working environment, high labor intensity, and potential safety hazards. However, due to the size of the ventilation duct opening, some places cannot be entered at all, resulting in some areas that cannot be effectively cleaned. At the same time, manual cleaning is inefficient and it is difficult to ensure the consistency of cleaning quality.

[0004] Existing mechanical cleaning devices often have problems with single functions and poor adaptability. Some cleaning equipment can only work in pipes of specific shapes or sizes, and are not adaptable enough to circular ventilation ducts. In addition, these devices have limited ability to move within the pipes and cannot move freely in horizontal and vertical pipes, making some areas difficult to clean. Moreover, most existing cleaning equipment lacks effective monitoring methods and cannot understand the cleaning status inside the pipes in real time, making it difficult to ensure the cleaning effect.

[0005] In actual applications, due to the limitations of existing cleaning technology and equipment, the cleaning effect of ventilation ducts is often unsatisfactory. Not only can the dirt on the inner wall of the duct not be completely removed, but it may also cause damage to the duct, increasing maintenance costs. Summary of the invention

[0006] In response to the above problems, the present invention provides a telescopic cleaning robot for circular ventilation ducts, which can meet the cleaning needs of circular ventilation ducts of various specifications, reducing the cost and trouble of equipping different ducts with different cleaning equipment. The robot can move freely in horizontal and vertical ducts, breaking through the limitations of traditional cleaning equipment in terms of the direction of the duct, and can monitor the cleaning conditions in the duct in real time, thereby achieving efficient dirt removal.

[0007] To solve the above problems, the technical solution adopted by the present invention is:

[0008] A telescopic cleaning robot for a circular ventilation duct comprises a main body control device, a plurality of walking devices, an umbrella-shaped telescopic device, a monitoring device and a cleaning device;

[0009] The cleaning device is installed at the front end of the main control device, the umbrella-shaped telescopic device is installed at the rear end of the main control device, a plurality of the walking devices are installed on the circumferential side wall of the main control device, and the monitoring device is installed at the front and rear ends of the main control device;

[0010] The cleaning device comprises a brush shaft rotatably connected to the front end of the main control device, the front end of the brush shaft is provided with a cleaning brush, and the cleaning brush is used to clean the circumferential inner wall of the circular ventilation duct;

[0011] The walking device comprises a pair of retractable swing arm assemblies, the telescopic ends of the pair of swing arm assemblies are fixedly mounted with a walking drive assembly, the walking drive assembly drives a pair of walking wheels, and the pair of swing arm assemblies swing synchronously through a connecting rod;

[0012] The umbrella-shaped telescopic device comprises a telescopic box installed at the rear end of the main control device, a telescopic assembly is installed in the telescopic box, the telescopic assembly is connected to a plurality of swing arm assemblies at the rear end through a support rod, and the telescopic assembly is extended and retracted to synchronously push the plurality of swing arm assemblies to swing through the plurality of support rods;

[0013] The monitoring device includes a front camera, a rear camera and a side camera, which are used to monitor the cleaning situation in the pipeline.

[0014] Preferably, the main control device includes a main shell, in which an electric control component, a cleaning drive component and a heat dissipation component are installed. The electric control component is used to control the cleaning drive component, the walking drive component, the monitoring device and the umbrella-shaped telescopic device. The electric control component is connected to an external control box through an aviation plug and a cable, and the telescopic box is fixedly installed at the rear end of the main shell.

[0015] Preferably, the cleaning drive assembly includes a mounting plate fixedly mounted in the main housing, a first reduction motor is fixedly mounted on the side wall of the mounting plate, the rear end of the brush shaft extends into the main housing, and the rear end of the brush shaft is connected to the output end of the first reduction motor via an elastic coupling.

[0016] Preferably, the swing arm assembly includes a kit and a telescopic part, the kit and the telescopic part are locked by a pair of locking screws, the outer ends of the kit are fixedly connected with connecting shafts on both sides, the two ends of the connecting rod are respectively rotatably connected to the corresponding connecting shafts, the inner end of the kit is rotatably connected with a rotating ear, the rotating ear is fixedly mounted on the sealing plate, and the sealing plate is fixedly mounted on the side wall of the main shell.

[0017] Preferably, the travel drive assembly is fixedly mounted at the end of the telescopic member, the travel drive assembly comprises a worm gear reduction motor, and a pair of travel wheels are respectively fixedly mounted on two output ends of the worm gear reduction motor.

[0018] Preferably, the telescopic assembly includes a screw rod rotatably connected to the telescopic box, a docking plate is fixedly connected to the docking end of the telescopic box and the main shell, a second reduction motor is fixedly installed on the docking plate, a pinion is fixedly installed on the output end of the second reduction motor, a large gear is fixedly installed on the end of the screw rod, the large gear is meshed with the small gear, a screw nut is threadedly sleeved on the screw rod, the inner end of the support rod is mounted on the side wall of the screw nut through an elastic component, and the circumferential side wall of the telescopic box is provided with a plurality of exit holes for the corresponding support rods to pass through.

[0019] Preferably, the elastic component includes a plurality of slide grooves circumferentially arranged on the side wall of the screw nut, a guide rod is fixedly installed in the slide groove, a slider is mounted on the guide rod, the slider is elastically connected to the inner wall of the slide groove by a spring, and the inner end of the support rod is rotatably connected to the corresponding slider.

[0020] Preferably, the rear camera and the side cameras are both installed on the telescopic box, the front camera is installed at the front end of the main shell, and a pair of LED lights are also installed at the front end of the main shell.

[0021] Preferably, a sealing box is fixedly installed on the front end of the main shell, the brush shaft passes through the sealing box, sealing rings sleeved on the brush shaft are installed in both ends of the sealing box, the brush shaft is a hollow shaft, and a liquid inlet is provided on the side wall between a pair of sealing rings, a liquid cavity connected to the liquid inlet is provided between a pair of sealing rings in the sealing box, the liquid cavity is connected to a liquid inlet pipe, a brush head is fixedly installed on the front end of the brush shaft, a plurality of liquid spray holes connected to the brush shaft are provided on the circumferential side wall of the brush head, and the cleaning brush is installed on the brush head.

[0022] Preferably, an ultraviolet lamp is installed on the side wall of the connecting rod.

[0023] The beneficial effects of the present invention are:

[0024] 1. This robot adopts a retractable design, which can adapt to structures of different pipe diameters, greatly improving the versatility and applicability of the equipment. It can meet the cleaning needs of circular ventilation ducts of various specifications, reducing the cost and trouble of equipping different pipes with different cleaning equipment.

[0025] 2. The high-definition cameras at the front and back allow operators to monitor the cleaning status of the inside of the pipeline in real time, and promptly discover and deal with areas that are not cleaned properly, thereby significantly improving the quality and effect of cleaning and ensuring that the inner wall of the pipeline is fully and thoroughly cleaned.

[0026] 3. The robot can move freely in horizontal and vertical pipes, breaking through the limitations of traditional cleaning equipment in terms of pipe direction, achieving all-round cleaning coverage, avoiding the existence of cleaning dead corners, and ensuring the normal operation of the ventilation system and air quality.

[0027] 4. The unique umbrella-shaped telescopic device enhances the robot's stability in the pipeline, reducing the risk of cleaning errors or damage to the pipeline due to shaking or instability of the equipment.

[0028] 5. For normal pipeline cleaning, only dry cleaning with a cleaning brush is needed, which avoids the problems of water accumulation and moisture caused by water spraying, and reduces the process and cost of subsequent drying treatment. The on-site ventilation system is used to remove the raised dirt, achieving efficient dirt removal and reducing secondary pollution to the environment.

[0029] 6. When there are a lot of bacteria, fungi and other pollutants in the pipeline, you can use disinfectant to sterilize it, and then keep the pipeline ventilated for a period of time to dry the inside of the pipeline and complete the sterilization process. You can also use robot peristalsis combined with ultraviolet light to automatically sterilize. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A top view of the present invention;

[0031] Figure 2 is a cross-sectional view of the present invention;

[0032] Figure 3 A three-dimensional schematic diagram of the main housing proposed by the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the walking device proposed by the present invention;

[0034] Figure 5 A cross-sectional schematic diagram of a swing arm assembly proposed by the present invention;

[0035] Figure 6 It is a cross-sectional schematic diagram of the telescopic box proposed by the present invention;

[0036] Figure 7 A three-dimensional schematic diagram of the telescopic box proposed by the present invention;

[0037] Figure 8 for Figure 2 A schematic diagram of the enlarged structure in FIG.

[0038] In the figure: 1 main control device, 11 main housing, 12 first reduction motor, 13 elastic coupling, 14 sealing plate, 15 heat dissipation component, 16 electric control component, 17 mounting plate, 2 walking device, 21 walking wheel, 22 walking drive component, 23 connecting rod, 24 swing arm component, 25 locking screw, 26 rotating lug, 27 worm gear reduction motor, 28 connecting shaft, 3 umbrella-shaped telescopic device, 31 telescopic box, 32 support rod, 33 screw rod, 34 screw rod nut, 3 5 outlet hole, 36 large gear, 37 small gear, 38 second reduction motor, 39 slider, 310 spring, 311 guide rod, 312 docking plate, 4 cleaning device, 41 cleaning brush, 42 brush head, 43 brush shaft, 44 spray hole, 45 liquid inlet, 46 sealing box, 47 sealing ring, 48 liquid cavity, 49 liquid inlet pipe, 5 LED lamp, 6 aviation plug, 7 monitoring device, 71 front camera, 72 rear camera, 73 side camera, 8 ultraviolet lamp. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0041] Reference Figure 1-8A telescopic cleaning robot for circular ventilation ducts includes a main control device 1, a plurality of walking devices 2, an umbrella-shaped telescopic device 3, a monitoring device 7 and a cleaning device 4. The cleaning device 4 is installed at the front end of the main control device 1, the umbrella-shaped telescopic device 3 is installed at the rear end of the main control device 1, the plurality of walking devices 2 are installed on the circumferential side wall of the main control device 1, and the monitoring device 7 is installed at the front and rear ends of the main control device 1. The robot moves forward along the duct driven by the walking device 2. During the moving process, the cleaning brush 41 on the head starts to work, lifting the dust on the inner wall of the duct. At the same time, the umbrella-shaped telescopic device 3 at the rear is appropriately extended according to the condition of the duct to keep the robot stable. The monitoring device 7 transmits the image inside the duct back to the control box in real time, and the operator adjusts the robot's movement and cleaning strength according to the image. When the cleaning is completed, the robot exits the duct.

[0042] Furthermore, the main control device 1 includes a main shell 11, in which an electric control component 16, a cleaning drive component and a heat dissipation component 15 are installed. The electric control component 16 is used to control the cleaning drive component, the walking drive component 22, the monitoring device 7 and the umbrella-shaped telescopic device 3. The electric control component 16 is connected to an external control box through an aviation plug 6 and a cable. The telescopic box 31 is fixedly installed at the rear end of the main shell 11. The main body is made of high-strength and corrosion-resistant materials to ensure long-term and stable operation in harsh pipeline environments.

[0043] The cleaning device 4 includes a brush shaft 43 rotatably connected to the front end of the main control device 1, and a cleaning brush 41 is mounted on the front end of the brush shaft 43. The cleaning brush 41 is used to clean the circumferential inner wall of the circular ventilation duct. The cleaning drive assembly includes a mounting plate 17 fixedly installed in the main shell 11, and a first reduction motor 12 is fixedly installed on the side wall of the mounting plate 17. The rear end of the brush shaft 43 extends into the main shell 11, and the rear end of the brush shaft 43 is connected to the output end of the first reduction motor 12 through an elastic coupling 13. The first reduction motor 12 is started, and the brush shaft 43 is driven to rotate through the elastic coupling 13, and then the cleaning brush 41 is driven to rotate, so as to lift the dust on the inner wall of the pipe, and take away the dirt in combination with the on-site ventilation system, thereby achieving an efficient and thorough cleaning effect and avoiding the influence of dirt residue on the pipe and air quality. The bristles are made of nylon, which can effectively remove stubborn dirt without damaging the inner wall of the pipe.

[0044] During the normal cleaning process, dry cleaning is performed using a sweeping brush to avoid problems such as water accumulation and moisture that may be caused by spraying water, and to reduce the subsequent drying process and costs.

[0045] The walking device 2 includes a pair of retractable swing arm assemblies 24, and a walking drive assembly 22 is fixedly installed at the telescopic end of the pair of swing arm assemblies 24. The walking drive assembly 22 drives a pair of walking wheels 21. The pair of swing arm assemblies 24 swing synchronously through a connecting rod 23. The walking drive assembly 22 is fixedly installed at the end of the telescopic member. The walking drive assembly 22 includes a worm gear reduction motor 27. The pair of walking wheels 21 are respectively fixedly installed on the two output ends of the worm gear reduction motor 27.

[0046] Furthermore, the swing arm assembly 24 includes a kit and a telescopic part, which are locked by a pair of locking screws 25. The outer ends of the kit are fixedly connected with connecting shafts 28 on both sides, and the two ends of the connecting rod 23 are rotatably connected to the corresponding connecting shafts 28. The inner end of the kit is rotatably connected with a rotating ear 26, and the rotating ear 26 is fixedly mounted on the sealing plate 14. The sealing plate 14 is fixedly mounted on the side wall of the main shell 11. The telescopic length of the kit and the telescopic part can be adjusted according to the diameter of the pipeline. It is locked by the locking screws 25, which greatly improves the versatility and applicability of the equipment, can meet the cleaning needs of circular ventilation ducts of various specifications, and reduces the cost and trouble of equipping different pipelines with different cleaning equipment.

[0047] The umbrella-shaped telescopic device 3 includes a telescopic box 31 installed at the rear end of the main control device 1, a telescopic assembly is installed in the telescopic box 31, the telescopic assembly is connected to the multiple swing arm assemblies 24 at the rear end through a support rod 32, the telescopic assembly is telescopic through the multiple support rods 32 synchronously pushes the multiple swing arm assemblies 24 to swing, the telescopic assembly includes a screw rod 33 rotatably connected to the telescopic box 31, the docking end of the telescopic box 31 and the main housing 11 is fixedly connected to a docking plate 312, a second reduction motor 38 is fixedly installed on the docking plate 312, a small gear 37 is fixedly installed at the output end of the second reduction motor 38, a large gear 36 is fixedly installed at the end of the screw rod 33, and the large gear 36 and the small gear 37 are fixedly installed. The gears 37 are meshed, and a screw nut 34 is threadedly mounted on the screw rod 33. The inner end of the support rod 32 is mounted on the side wall of the screw nut 34 through an elastic component. The circumferential side wall of the telescopic box 31 is provided with a plurality of outlet holes 35 for the corresponding support rods 32 to pass through. The second reduction motor 38 is started, and the large gear 36 is driven to rotate through the small gear 37, and then the screw rod 33 is driven to rotate, thereby driving the screw nut 34 to move back and forth, and the walking device 2 is driven to swing through the umbrella-shaped multiple support rods 32. When the diameter of the pipeline changes or the cleaning range needs to be expanded, the umbrella-shaped telescopic device 3 can extend outward to increase the contact area between the robot and the inner wall of the pipeline, thereby improving stability and cleaning effect.

[0048] Furthermore, the elastic component includes a plurality of slide grooves circumferentially arranged on the side wall of the screw nut 34, a guide rod 311 is fixedly installed in the slide groove, a slider 39 is mounted on the guide rod 311, the slider 39 is elastically connected to the inner wall of the slide groove by a spring 310, and the inner end of the support rod 32 is rotatably connected to the corresponding slider 39, so that the walking wheel 21 always contacts the pipe wall.

[0049] The monitoring device 7 includes a front camera 71, a rear camera 72 and a side camera 73. The rear camera 72 and the side camera 73 are all installed on the telescopic box 31. The front camera 71 is installed at the front end of the main shell 11. A pair of LED lights 5 are also installed at the front end of the main shell 11, which are connected to the rear control box through wires. The operator can monitor the cleaning situation inside the pipeline in real time, accurately grasp the cleaning progress and effect of every corner, and greatly improve the controllability and accuracy of the cleaning.

[0050] In addition, a sealing box 46 is fixedly installed at the front end of the main shell 11, and the brush shaft 43 passes through the sealing box 46. Sealing rings 47 mounted on the brush shaft 43 are installed in both ends of the sealing box 46. The brush shaft 43 is a hollow shaft, and a liquid inlet 45 is provided on the side wall between a pair of sealing rings 47. A liquid cavity 48 connected to the liquid inlet 45 is provided between a pair of sealing rings 47 in the sealing box 46. The liquid cavity 48 is connected to a liquid inlet pipe 49. A brush head 42 is fixedly mounted on the front end of the brush shaft 43. A plurality of liquid spray holes 44 connected to the brush shaft 43 are provided on the circumferential side wall of the brush head 42. A cleaning brush 41 is installed on the brush head 42. When a large number of contaminants such as bacteria and fungi appear in the pipeline, disinfectant can be sprayed for sterilization. Then the pipeline is kept ventilated for a period of time to achieve drying inside the pipeline and realize the sterilization process.

[0051] The specific process is as follows: the liquid inlet pipe 49 is connected to an external water pump to pump the disinfectant into the liquid cavity 48 of the sealed box 46, and then enters the rotating brush shaft 43 through the liquid inlet 45, and finally is evenly sprayed onto the pipe wall through multiple spray holes 44, and the sterilization process of the pipeline is realized in coordination with the movement, and drying is achieved using the ventilation system.

[0052] Another sterilization method can also be used. An ultraviolet lamp 8 is installed on the side wall of the connecting rod 23. The robot moves slowly in the pipeline and cooperates with multiple ultraviolet lamps 8 in the circumferential direction to achieve the sterilization process.

[0053] During the actual cleaning process, the robot is first placed in the entrance of the ventilation duct. The operator starts the robot through the control box, and the robot moves along the duct driven by the walking device 2. During the moving process, the cleaning brush 41 on the head starts to work, lifting the dust and dirt on the inner wall of the duct, and the lifted dirt is taken away by the on-site ventilation system. At the same time, the rear umbrella-shaped telescopic device 3 is appropriately extended according to the condition of the duct to keep the robot stable. The front camera 71, the rear camera 72 and the side camera 73 transmit the image of the inside of the duct back to the control box in real time, and the operator adjusts the robot's movement and cleaning strength according to the image. When the cleaning is completed, the robot exits the duct.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A telescopic cleaning robot for a circular ventilation duct, characterized in that: It comprises a main body control device (1), a plurality of walking devices (2), an umbrella-shaped telescopic device (3), a monitoring device (7) and a cleaning device (4); The cleaning device (4) is mounted at the front end of the main control device (1), the umbrella-shaped telescopic device (3) is mounted at the rear end of the main control device (1), a plurality of the walking devices (2) are mounted on the circumferential side wall of the main control device (1), and the monitoring device (7) is mounted at the front and rear ends of the main control device (1); The cleaning device (4) comprises a brush shaft (43) rotatably connected to the front end of the main control device (1), the front end of the brush shaft (43) being provided with a cleaning brush (41), the cleaning brush (41) being used to clean the circumferential inner wall of the circular ventilation duct; The walking device (2) comprises a pair of retractable swing arm assemblies (24), the telescopic ends of the pair of swing arm assemblies (24) are fixedly mounted with a walking drive assembly (22), the walking drive assembly (22) drives a pair of walking wheels (21), and the pair of swing arm assemblies (24) swing synchronously via a connecting rod (23); The umbrella-shaped telescopic device (3) comprises a telescopic box (31) installed at the rear end of the main control device (1), a telescopic assembly is installed in the telescopic box (31), the telescopic assembly is connected to a plurality of swing arm assemblies (24) at the rear end via a support rod (32), and the telescopic assembly is extended and retracted to synchronously push the plurality of swing arm assemblies (24) to swing via the plurality of support rods (32); The monitoring device (7) comprises a front camera (71), a rear camera (72) and a side camera (73), and is used to monitor the cleaning conditions in the pipeline.

2. A telescopic cleaning robot for a circular ventilation duct according to claim 1, characterized in that: The main control device (1) comprises a main housing (11), wherein an electric control component (16), a cleaning drive component and a heat dissipation component (15) are installed in the main housing (11); the electric control component (16) is used to control the cleaning drive component, the walking drive component (22), the monitoring device (7) and the umbrella-shaped telescopic device (3); the electric control component (16) is connected to an external control box via an aviation plug (6) and a cable; and the telescopic box (31) is fixedly installed at the rear end of the main housing (11).

3. A telescopic cleaning robot for a circular ventilation duct according to claim 2, characterized in that: The cleaning drive assembly comprises a mounting plate (17) fixedly mounted in a main housing (11); a first reduction motor (12) is fixedly mounted on a side wall of the mounting plate (17); a rear end of the brush shaft (43) extends into the main housing (11); and the rear end of the brush shaft (43) is butt-jointed with an output end of the first reduction motor (12) via an elastic coupling (13).

4. A telescopic cleaning robot for a circular ventilation duct according to claim 1, characterized in that: The swing arm assembly (24) comprises a set and a telescopic part, wherein the set and the telescopic part are locked by a pair of locking screws (25), and both sides of the outer end of the set are fixedly connected with connecting shafts (28), and the two ends of the connecting rod (23) are respectively rotatably connected to the corresponding connecting shafts (28), and the inner end of the set is rotatably connected with a rotating ear (26), and the rotating ear (26) is fixedly mounted on the sealing plate (14), and the sealing plate (14) is fixedly mounted on the side wall of the main shell (11).

5. A telescopic cleaning robot for a circular ventilation duct according to claim 4, characterized in that: The travel drive assembly (22) is fixedly mounted at the end of the telescopic member, the travel drive assembly (22) comprises a worm gear reduction motor (27), and a pair of travel wheels (21) are respectively fixedly mounted on two output ends of the worm gear reduction motor (27).

6. The telescopic cleaning robot for a circular ventilation duct according to claim 1, characterized in that: The telescopic assembly comprises a screw rod (33) rotatably connected in a telescopic box (31); a docking plate (312) is fixedly connected to the docking end of the telescopic box (31) and the main housing (11); a second reduction motor (38) is fixedly mounted on the docking plate (312); a pinion gear (37) is fixedly mounted on the output end of the second reduction motor (38); a large gear (36) is fixedly mounted on the end of the screw rod (33); the large gear (36) is meshed with the small gear (37); a screw rod nut (34) is threadedly sleeved on the screw rod (33); the inner side end of the support rod (32) is mounted on the side wall of the screw rod nut (34) through an elastic component; and a plurality of through holes (35) for corresponding support rods (32) to pass through are provided on the circumferential side wall of the telescopic box (31).

7. A telescopic cleaning robot for a circular ventilation duct according to claim 6, characterized in that: The elastic component comprises a plurality of slide grooves circumferentially arranged on the side wall of the screw nut (34), a guide rod (311) being fixedly installed in the slide groove, a slider (39) being mounted on the guide rod (311), the slider (39) being elastically connected to the inner wall of the slide groove via a spring (310), and the inner end of the support rod (32) being rotatably connected to the corresponding slider (39).

8. The telescopic cleaning robot for a circular ventilation duct according to claim 1, characterized in that: The rear camera (72) and the side camera (73) are both installed on the telescopic box (31), and the front camera (71) is installed on the front end of the main shell (11). A pair of LED lights (5) are also installed on the front end of the main shell (11).

9. The telescopic cleaning robot for a circular ventilation duct according to claim 1, characterized in that: A sealing box (46) is fixedly mounted on the front end of the main housing (11), the brush shaft (43) passes through the sealing box (46), sealing rings (47) mounted on the brush shaft (43) are mounted on both ends of the sealing box (46), the brush shaft (43) is a hollow shaft, and a liquid inlet (45) is provided on the side wall between a pair of sealing rings (47), a liquid cavity (48) in communication with the liquid inlet (45) is provided in the sealing box (46) between the pair of sealing rings (47), and the liquid cavity (48) is connected with a liquid inlet pipe (49), a brush head (42) is fixedly mounted on the front end of the brush shaft (43), a plurality of liquid spray holes (44) in communication with the brush shaft (43) are provided on the circumferential side wall of the brush head (42), and the cleaning brush (41) is mounted on the brush head (42).

10. The telescopic cleaning robot for a circular ventilation duct according to claim 1, characterized in that: An ultraviolet lamp (8) is installed on the side wall of the connecting rod (23).

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