A spraying device and spraying method for electrical insulating paint

Abstract

This invention discloses a spraying device and method for electrical insulating coatings, relating to the field of coating spraying technology. The device includes a housing with cable access ports at both ends and on the side walls. Two fixed seats are symmetrically mounted on the inner top wall of the housing. Each fixed seat is rotatably connected to a pair of rotating shafts. The two pairs of rotating shafts are coaxially connected to a front traveling wheel and a rear traveling wheel, respectively. Both the front and rear traveling wheels have travel grooves that match the cable. This invention utilizes a hydraulically driven adjustment mechanism on the rear traveling wheel. The asymmetrical radial pressure exerted on the rear traveling wheel as it travels on the cable drives the spraying ring to automatically adjust its pitch angle. When the cable bends due to sag or the robot's own weight, the central axis of the spraying ring can follow the cable axis in real time, always maintaining coincidence. This solves the coating skewing problem caused by the fixed angle of the spraying ring in existing technologies, significantly improving spray uniformity.

Description

Technical Field

[0001] This invention relates to the field of coating spraying technology, and more particularly to a spraying apparatus and method for electrical insulating coatings. Background Technology

[0002] In overhead cable lines, bare conductors are exposed to the outdoor environment for extended periods, making them susceptible to damage from birds, trees, salt spray, and industrial pollution, which can cause line tripping accidents and severely impact power supply reliability. To address this issue, current methods involve spraying electrical insulating coatings onto the cable surface.

[0003] Existing technologies include robots for spraying insulating coatings onto cables, which combine a walking mechanism, a spraying mechanism, and a feeding mechanism. The walking mechanism carries the robot along the line, while the spraying mechanism uses a ring-shaped nozzle mounted on the conductor to perform 360° circular spraying during the journey. However, this type of spraying robot has the following technical problems in practical applications: the geometry of overhead lines between two towers is that of a catenary, and its tangential direction (i.e., the conductor's direction) changes continuously with position. Furthermore, the spraying robot is suspended on the conductor, and under the robot's own weight, the conductor undergoes local elastic bending at the contact point of the walking wheels. This angle, when superimposed with the conductor's own sag angle, results in a deflection angle ranging from 0° to 30°. Figure 8 As shown, in the area at the beginning and end of the overhead line (near the tower), the conductor itself has a large sag angle. The line connecting the cable behind the spraying robot and the center of the front and rear wheels of the spraying robot has an angle. As the spraying robot moves away from the tower, the angle will continuously change. The existing spraying robot's ring nozzle is rigidly connected to the walking mechanism or uses a fixed installation angle. When spraying in the above situation, the conductor axis deviates from the central axis of the ring nozzle, resulting in a coating that is thick on one side and thin on the other, or even a spraying blind zone. It is difficult to guarantee the uniformity of spraying, which seriously affects the insulation performance. Therefore, there is an urgent need to provide an insulating coating spraying device that can adaptively adjust the angle of the spraying ring and keep the cable always in the center area of ​​the spraying ring. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art by providing a spraying device and spraying method for electrical insulating coatings.

[0005] A spraying apparatus for electrical insulating coatings, comprising: The housing has cable access ports at both ends and on the side walls. Two fixed seats are symmetrically installed on the inner top wall of the housing. Each fixed seat is rotatably connected to a pair of rotating shafts. The two pairs of rotating shafts are coaxially connected to a front wheel and a rear wheel. The front wheel and the rear wheel are provided with a travel groove to match the cable. The housing is also provided with a drive unit for driving the front wheel and the rear wheel to travel on the cable and an auxiliary unit for stabilizing the travel. The spraying mechanism includes a spraying ring and a storage tank. The spraying ring is mounted on the outside of the housing and located on the side of the rear travel wheel via a support unit. Multiple nozzles are evenly arranged on the inner ring surface of the spraying ring. The storage tank is suspended at the bottom of the housing by a hoisting rope. A supply pipe is provided on the storage tank and connected to the multiple nozzles for continuously supplying insulating coating for ring spraying operation. An adjustment mechanism is provided on the rear wheels and the outer wall of the housing, and is used to automatically adjust the angle of the spray ring so that the cable is always in the spray center area of ​​the spray ring during the entire movement of the device.

[0006] Preferably, the support unit includes a fixed plate and an elastic telescopic rod. The fixed plate is fixedly connected to the rear outer wall of the housing and is coaxially arranged with the rear wheel. A rotating rod is rotatably connected to the center of the fixed plate. A support rod is vertically connected to the end of the rotating rod away from the center. The end of the support rod away from the rotating rod is connected to the spraying ring. The bottom end of the elastic telescopic rod is rotatably connected to the outer wall of the housing through a pin. A rotating seat is connected to the middle section of the support rod. The movable end of the elastic telescopic rod is rotatably connected to the rotating seat through a pin.

[0007] Preferably, the adjusting mechanism includes an arc-shaped sealing block and an arc-shaped push block. A circular cavity is formed at the center of the rear traveling wheel. Multiple liquid grooves are formed in a circular array on the annular wall of the cavity. A piston block is slidably connected to each liquid groove. A movable rod is connected to the side of each piston block away from the cavity. The end of each movable rod away from the piston block extends into the traveling groove. An arc-shaped cavity with the center of the fixed plate as its arc is formed in the fixed plate. The sealing block is slidably connected to the four walls of the arc-shaped cavity. The rear traveling wheel, the rotating shaft, and the fixed plate are all connected in a sealed manner. The fixed plate has a common cavity that communicates with the empty cavity. The fixed plate has a liquid guide groove that connects the cavity and the arc-shaped cavity. The fixed plate has an arc-shaped groove with the center of the fixed plate as the arc center. The push block is slidably connected to the arc-shaped groove. The end of the sealing block away from the liquid guide groove is connected to an arc-shaped rod. The end of the arc-shaped rod away from the sealing block extends into the arc-shaped groove and connects to the push block. A spring is sleeved on the arc-shaped rod. The two ends of the spring are respectively connected to the sealing block and the cavity wall of the arc-shaped cavity. A guide block is connected through the support rod. One end of the guide block is slidably connected to the arc-shaped groove.

[0008] Preferably, the cavity, the connecting cavity, the fluid guide groove, and the arc-shaped cavity are all filled with hydraulic oil.

[0009] Preferably, the drive unit includes a motor, which is mounted on the outer wall of the housing. The output shaft of the motor extends into the housing and is coaxially connected to one end of the shaft of the front wheel. The shafts of the front wheel and the rear wheel, which are away from the motor, are coaxially connected to sprockets. The two sprockets are fitted together with a chain.

[0010] Preferably, the auxiliary unit includes a lifting plate and two auxiliary wheels. Multiple vertical guide rods are fixedly connected to the bottom inner wall of the housing. The lifting plate is slidably connected to the multiple guide rods. The two auxiliary wheels are symmetrically mounted on the lifting plate. The positions of the two auxiliary wheels correspond to the front travel wheel and the rear travel wheel. A threaded rod is threadedly connected to the bottom of the housing. The upper end of the threaded rod is rotatably connected to the bottom of the lifting plate. A handwheel is coaxially connected to the lower end of the threaded rod.

[0011] Preferably, the storage tank is equipped with a pump body required for the spraying operation.

[0012] Preferably, the electrical equipment in the drive unit and the spraying mechanism can be powered by a storage battery or by a tethered power supply.

[0013] The present invention also proposes a spraying method for electrical insulating coatings, employing the above-mentioned spraying apparatus, comprising the following steps: S1: Environmental Condition Confirmation Before construction, confirm that the ambient temperature is not lower than 5℃, the relative humidity is not higher than 80%, and there are no humid weather conditions such as fog, condensation, precipitation, snowfall, or wind and sand. S2: Surface Cleaning Before spraying, use a cable cleaning robot or cleaning drone to remove dust, oil and oxide layer from the surface of the pre-coated cable to ensure that the conductor surface is clean and dry. S3: Device wiring and pre-adjustment The entire spraying device is suspended on the bare cable to be sprayed, and the various mechanisms and units are adjusted to ensure proper installation and suspension. S4: Spraying Operation Start the spraying device and move it along the cable. During the spraying process, keep the coating uniform, without accumulation, dripping, bubbles, or missed areas. S5: Curing and Testing After spraying, allow the coating to cure at room temperature under ambient conditions; the cured coating should meet the following requirements: dielectric strength ≥ 20 kV / mm, volume resistivity ≥ 1 × 10⁻⁶. 12 Ω·m, adhesion ≥3.0MPa, flame retardant rating ≥FV-1.

[0014] Compared with existing technologies, the advantages of this invention are: 1. This invention uses a hydraulically driven adjustment mechanism on the rear walking wheel to drive the spraying ring to automatically adjust its pitch angle by utilizing the asymmetric radial pressure exerted by the rear walking wheel on the cable. When the cable bends due to sag or the robot's own weight, the central axis of the spraying ring can follow the cable axis in real time and always remain aligned, thereby solving the coating skewing problem caused by the fixed angle of the spraying ring in the prior art and significantly improving the uniformity of spraying.

[0015] 2. The adjustment mechanism of this invention requires no electronic sensors or external control system; it can achieve real-time tracking and response to changes in cable angle solely through a purely mechanical hydraulic structure. The hydraulic transmission method offers sensitive response and high reliability, while the spring reset mechanism ensures that the spray ring automatically returns to its original position when the device moves to a flat section. The overall structure is compact and lightweight, making it suitable for live-line work on overhead lines, thus reducing equipment costs and failure rates. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a cross-sectional view of the shell structure in this invention.

[0018] Figure 3 This is a schematic diagram of the structure of the back of the shell in this invention.

[0019] Figure 4 This is a cross-sectional view of the rear walking wheel section in this invention.

[0020] Figure 5 This is a cross-sectional view of the rear walking wheel section from another angle in this invention.

[0021] Figure 6 This is a cross-sectional view of the fixed disk in this invention.

[0022] Figure 7 This is a schematic diagram of the spraying mechanism in this invention.

[0023] Figure 8 This is a schematic diagram showing the deviation between the central axis of the annular nozzle on a painting robot and the cable conductor in the prior art.

[0024] In the diagram: 1. Housing, 10. Motor, 11. Fixed base, 12. Rotating shaft, 121. Chain, 13. Front traveling wheel, 14. Rear traveling wheel, 15. Guide rod, 151. Lifting plate, 16. Auxiliary wheel, 17. Threaded rod, 18. Handwheel, 19. Traveling groove, 2. Spraying mechanism, 21. Fixed plate, 22. Rotating rod, 23. Support rod, 24. Spraying ring, 25. Nozzle, 26. Feed pipe, 27. Storage box, 271. Lifting rope, 28. Elastic telescopic rod, 281. Rotating base, 3. Adjusting mechanism, 31. Cavity, 32. Liquid tank, 33. Piston block, 34. Movable rod, 35. Connecting cavity, 36. Arc cavity, 361. Sealing block, 362. Arc rod, 363. Spring, 364. Push block, 37. Arc groove, 38. Liquid guide groove. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified. 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 an intervening 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 an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used herein is only for describing particular embodiments and is not intended to limit the scope of this application. The term “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0027] Reference Figure 1-7As shown, a spraying device for electrical insulating coating includes a housing 1, a spraying mechanism 2, and an adjusting mechanism 3. Cable access ports are provided at both ends and on the side walls of the housing 1. Two fixed seats 11 are symmetrically installed on the inner top wall of the housing 1. Each fixed seat 11 is rotatably connected to a pair of rotating shafts 12. The two pairs of rotating shafts 12 are coaxially connected to a front traveling wheel 13 and a rear traveling wheel 14, respectively. Both the front traveling wheel 13 and the rear traveling wheel 14 are provided with traveling grooves 19 to match the cable. The housing 1 is also provided with a drive unit for driving the front traveling wheel 13 and the rear traveling wheel 14 to travel on the cable and an auxiliary unit for assisting stable travel.

[0028] The spraying mechanism 2 includes a spraying ring 24 and a storage tank 27. The spraying ring 24 is installed on the outside of the housing 1 and located on the side of the rear travel wheel 14 via a support unit. Multiple nozzles 25 are evenly arranged on the inner ring surface of the spraying ring 24. The spraying ring 24 has a notch for inserting cables into the ring. The storage tank 27 is suspended at the bottom of the housing 1 by a suspension rope 271 to avoid the weight of the storage tank 27 being concentrated on the housing 1 and causing the overall center of gravity to shift. The storage tank 27 is provided with a supply pipe 26 connected to multiple nozzles 25 for continuously supplying insulating coating for ring spraying operations.

[0029] The adjustment mechanism 3 is installed on the rear walking wheel 14 and the outer wall of the housing 1, and is used to automatically adjust the angle of the spraying ring 24 so that the cable is always in the spraying center area of ​​the spraying ring 24 during the entire movement of the device.

[0030] Furthermore, the specific structure of the support unit is as follows: it includes a fixed plate 21 and an elastic telescopic rod 28. The fixed plate 21 is fixedly connected to the rear outer wall of the housing 1, and the fixed plate 21 is coaxially arranged with the rear travel wheel 14. A rotating rod 22 is rotatably connected to the center of the fixed plate 21. A support rod 23 is vertically connected to the end of the rotating rod 22 away from the center. The end of the support rod 23 away from the rotating rod 22 is connected to the spraying ring 24. The bottom end of the elastic telescopic rod 28 is rotatably connected to the outer wall of the housing 1 through a pin. A rotating seat 281 is connected to the middle section of the support rod 23. The movable end of the elastic telescopic rod 28 is rotatably connected to the rotating seat 281 through a pin. The elastic telescopic rod 28 provides elastic support for the spraying ring 24. The elastic telescopic rod 28 always maintains a downward pulling force on the support rod 23, so that the spraying ring 24 remains stable during angle adjustment, while allowing the spraying ring 24 to rotate around the axis of the rotating rod 22 when subjected to driving force.

[0031] More preferably, the adjustment mechanism 3 is specifically implemented as follows: it includes an arc-shaped sealing block 361 and an arc-shaped push block 364. A circular cavity 31 is opened at the center of the rear walking wheel 14. Multiple liquid grooves 32 are opened in a circular array on the annular cavity wall of the cavity 31. A piston block 33 is slidably connected in each liquid groove 32. A movable rod 34 is connected to the side of each piston block 33 away from the cavity 31. The end of each movable rod 34 away from the piston block 33 extends into the walking groove 19. An arc-shaped cavity 36 with the center of the fixed disk 21 as the arc center is opened in the fixed disk 21. The sealing block 361 is slidably connected to the four sides of the arc-shaped cavity 36. The rear walking wheel 14, the rotating shaft 12 and the fixed disk 21 are connected to the cavity 31 by a connecting cavity 35. A liquid guiding groove 38 is provided in the fixed plate 21 to connect the connecting cavity 35 and the arc-shaped cavity 36. An arc-shaped groove 37 with the center of the fixed plate 21 as the arc center is provided on the fixed plate 21. The push block 364 is slidably connected to the arc-shaped groove 37. An arc-shaped rod 362 is connected to the end of the sealing block 361 away from the liquid guiding groove 38. The end of the arc-shaped rod 362 away from the sealing block 361 extends into the arc-shaped groove 37 and is connected to the push block 364. A spring 363 is sleeved on the arc-shaped rod 362. The two ends of the spring 363 are respectively connected to the cavity wall of the sealing block 361 and the arc-shaped cavity 36. A guide block 231 is connected through the support rod 23. One end of the guide block 231 is slidably connected to the arc-shaped groove 37. The cavity 31, the connecting cavity 35, the liquid guiding groove 38 and the arc-shaped cavity 36 are all filled with hydraulic oil.

[0032] In this embodiment, the drive unit includes a motor 10, which is mounted on the outer wall of the housing 1. The output shaft of the motor 10 extends into the housing 1 and is coaxially connected to one end of the shaft 12 of the front wheel 13. The shafts 12 of the front wheel 13 and the rear wheel 14, which are away from the motor 10, are coaxially connected to sprockets. The two sprockets are fitted with a chain 121. The motor 10 drives the front wheel 13 to rotate, and at the same time drives the rear wheel 14 to rotate synchronously through the chain 121, so as to realize synchronous drive of the front and rear wheels and ensure that the device moves stably along the cable.

[0033] More preferably, the auxiliary unit includes a lifting plate 151 and two auxiliary wheels 16. Multiple vertical guide rods 15 are fixedly connected to the bottom inner wall of the housing 1. The lifting plate 151 and the guide rods 15 are slidably connected through it. The two auxiliary wheels 16 are symmetrically mounted on the lifting plate 151, corresponding to the positions of the front travel wheel 13 and the rear travel wheel 14. A threaded rod 17 is threadedly connected to the bottom of the housing 1. The upper end of the threaded rod 17 is rotatably connected to the bottom of the lifting plate 151, and the lower end of the threaded rod 17 is coaxially connected to a handwheel 18. During suspension use, rotating the handwheel 18 causes the threaded rod 17 to push the lifting plate 151 up and down along the guide rods 15, causing the two auxiliary wheels 16 to move upwards and contact the cable from below, forming a clamping and positioning with the front travel wheel 13 and the rear travel wheel 14, preventing the device from detaching from the cable and improving walking stability.

[0034] In addition, the storage tank 27 is equipped with a pump body for spraying operations. The pump body pressurizes the insulating coating in the storage tank 27 and then delivers it to the nozzle 25 through the supply pipe 26 for spraying.

[0035] In addition, the electrical equipment in the drive unit and the spraying mechanism 2 can be powered by batteries or by tethered power. That is, the power is provided by the batteries carried by the device itself. This method can be used when the overhead cable is short and the terrain is complex. Alternatively, the power can be continuously supplied by an external power source through a tethered cable connected to the ground. This method is often used when the overhead cable is long and the terrain is flat.

[0036] This invention also proposes a spraying method for electrical insulating coatings, employing the aforementioned spraying apparatus, characterized by comprising the following steps: S1: Environmental Condition Confirmation Before construction, confirm that the ambient temperature is not lower than 5℃, the relative humidity is not higher than 80%, and there are no humid weather conditions such as fog, condensation, precipitation, snowfall, or wind and sand. S2: Surface Cleaning Before spraying, use a cable cleaning robot or cleaning drone to remove dust, oil and oxide layer from the surface of the pre-coated cable to ensure that the conductor surface is clean and dry. S3: Device wiring and pre-adjustment The entire spraying device is suspended on the bare cable to be sprayed, and the various mechanisms and units are adjusted to ensure proper installation and suspension. S4: Spraying Operation Start the spraying device and move it along the cable. During the spraying process, keep the coating uniform, without accumulation, dripping, bubbles, or missed areas. S5: Curing and Testing After spraying, allow the coating to cure at room temperature under ambient conditions; the cured coating should meet the following requirements: dielectric strength ≥ 20 kV / mm, volume resistivity ≥ 1 × 10⁻⁶. 12Ω·m, adhesion ≥3.0MPa, flame retardant rating ≥FV-1.

[0037] The working process and principle of this invention are as follows: In use, the entire device is suspended on an overhead cable. The motor 10 and the pump in the spraying mechanism 2 are turned on to start the spraying operation. When the rear travel wheel 14 travels along the cable, the radial pressure generated by the cable on the travel groove 19 is transmitted to the piston block 33 through the movable rod 34, causing the piston block 33 at different positions to slide to different degrees along the liquid groove 32, which forces the hydraulic oil out from part of the liquid groove 32. The hydraulic oil passes through the cavity 31, the connecting cavity 35, and the guide groove 38 in sequence into the arc cavity 36, pushing the sealing block 361 to overcome the elastic force of the spring 363 and slide along the arc cavity 36. The sealing block 361 pushes the push block 364 to move together through the arc rod 362. The push block 364 slides in the arc groove 37 and pushes the support rod 23 to rotate around the axis of the rotating rod 22 through the guide block 231, so that the angle of the support rod 22 is consistent with the angle of the cable behind the rear travel wheel 14, thereby driving the pitch angle of the spraying ring 24 to change.

[0038] When the device is in the area at the beginning and end of an overhead cable, the cable's deviation angle is large, resulting in a larger contact area between the cable and the travel groove 19 on the rear travel wheel 14. This increases the number of movable rods 34 that are pressed in. Through hydraulic transmission, the position of the push block 364 is readjusted, and the angle of the spray ring 24 is raised by the support rod 22. When the device travels to a section where the cable's inclination angle is smaller (the lowest point of the sag), the contact area between the cable and the travel groove 19 on the rear travel wheel 14 gradually decreases. The number of movable rods 34 that are pressed in decreases, the hydraulic pressure decreases, and the spring 363 pushes the sealing block 361 to gradually reset. Under the pull of the elastic telescopic rod 28, the rotating rod 22 and the support rod 23 return to their original positions, thereby achieving real-time tracking of the spray ring 24's angle according to the cable's direction.

[0039] It should be noted that even if the rear travel wheel 14 keeps rolling on the cable, and the cable angle does not change in a small section of the cable area, the number of movable rods 34 pressed into the entire rear travel wheel 14 will change (for example, four deeply pressed movable rods 34 will change to three deeply pressed movable rods 34 and two shallowly pressed movable rods 34), but the volume of hydraulic oil that causes the sliding change of all piston blocks 33 remains basically stable, thus maintaining the angle of the position support rod 22.

[0040] Therefore, the adjustment mechanism 3 utilizes the different contact areas generated by the cable tilt angle changes during the movement of the rear traveling wheel 14 to automatically adjust the angle of the spraying ring 24 via hydraulic transmission, ensuring that the cable is always positioned at the central axis of the spraying ring, guaranteeing uniform spraying and improving spraying quality. This adjustment method requires no electronic sensors or external control systems; it relies solely on a mechanical hydraulic structure to achieve real-time tracking and response to changes in cable angle.

[0041] The core technical concept of this invention is: by setting an adjustment mechanism 3 based on hydraulic transmission on the rear walking wheel 14, the radial pressure experienced by the rear walking wheel 14 when walking on the cable is used to drive the spraying ring 24 to automatically adjust the pitch angle, so that the central axis of the spraying ring 24 always coincides with the cable axis, thereby solving the problem of spraying deviation caused by cable bending due to cable sag and robot weight.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A spraying device for electrical insulating coatings, characterized in that, include: The housing (1) has cable access ports at both ends and on the side walls. Two fixed seats (11) are symmetrically installed on the top inner wall of the housing (1). Each fixed seat (11) is rotatably connected to a pair of rotating shafts (12). The two pairs of rotating shafts (12) are coaxially connected to a front walking wheel (13) and a rear walking wheel (14). The front walking wheel (13) and the rear walking wheel (14) are provided with walking grooves (19) to match the cable. The housing (1) is also provided with a drive unit for driving the front walking wheel (13) and the rear walking wheel (14) to walk on the cable and an auxiliary unit for stabilizing walking. The spraying mechanism (2) includes a spraying ring (24) and a storage tank (27). The spraying ring (24) is installed on the outside of the housing (1) and on the side of the rear walking wheel (14) by a support unit. Multiple nozzles (25) are evenly arranged on the inner ring surface of the spraying ring (24). The storage tank (27) is suspended at the bottom of the housing (1) by a hoisting rope (271). A supply pipe (26) is provided on the storage tank (27) and connected to multiple nozzles (25) for continuously supplying insulating coating for ring spraying operation. Adjustment mechanism (3) is provided on the rear walking wheel (14) and the outer wall of the housing (1), and is used to automatically adjust the angle of the spray ring (24) so ​​that the cable is always in the spray center area of ​​the spray ring (24) during the movement of the entire device.

2. The spraying device for electrical insulating coating according to claim 1, characterized in that: The support unit includes a fixed plate (21) and an elastic telescopic rod (28). The fixed plate (21) is fixedly connected to the rear outer wall of the housing (1) and is coaxially arranged with the rear walking wheel (14). A rotating rod (22) is rotatably connected to the center of the fixed plate (21). A support rod (23) is vertically connected to the end of the rotating rod (22) away from the center. The end of the support rod (23) away from the rotating rod (22) is connected to the spraying ring (24). The bottom end of the elastic telescopic rod (28) is rotatably connected to the outer wall of the housing (1) through a pin. A rotating seat (281) is connected to the middle section of the support rod (23). The movable end of the elastic telescopic rod (28) is rotatably connected to the rotating seat (281) through a pin.

3. The spraying device for electrical insulating coating according to claim 2, characterized in that: The adjustment mechanism (3) includes an arc-shaped sealing block (361) and an arc-shaped push block (364). A circular cavity (31) is provided at the center of the rear walking wheel (14). Multiple liquid grooves (32) are provided in a circular array on the annular cavity wall of the cavity (31). A piston block (33) is slidably connected to each liquid groove (32). A movable rod (34) is connected to the side of each piston block (33) away from the cavity (31). The end of each movable rod (34) away from the piston block (33) extends into the walking groove (19). An arc-shaped cavity (36) with the center of the fixed disk (21) as the arc center is provided in the fixed disk (21). The sealing block (361) is slidably connected to the four sides of the arc-shaped cavity (36). The rear walking wheel (14), the rotating shaft (12), and the fixed disk (21) are provided with a connecting cavity (35) and The cavity (31) is connected, and a liquid guide groove (38) is provided in the fixed plate (21) to connect the connecting cavity (35) and the arc-shaped cavity (36). An arc-shaped groove (37) with the center of the fixed plate (21) as the arc center is provided on the fixed plate (21). The push block (364) is slidably connected to the arc-shaped groove (37). An arc-shaped rod (362) is connected to the end of the sealing block (361) away from the liquid guide groove (38). The arc-shaped rod (364) 62) One end away from the sealing block (361) extends into the arc groove (37) and is connected to the push block (364). A spring (363) is sleeved on the arc rod (362). The two ends of the spring (363) are connected to the sealing block (361) and the cavity wall of the arc cavity (36) respectively. A guide block (231) is connected through the support rod (23). One end of the guide block (231) is slidably connected to the arc groove (37).

4. The spraying device for electrical insulating coating according to claim 3, characterized in that: The cavity (31), the connecting cavity (35), the liquid guide groove (38), and the arc-shaped cavity (36) are all filled with hydraulic oil.

5. A spraying device for electrical insulating coatings according to claim 1, characterized in that: The drive unit includes a motor (10), which is mounted on the outer wall of the housing (1). The output shaft of the motor (10) extends into the housing (1) and is coaxially connected to one end of the shaft (12) of the front wheel (13). The shafts (12) of the front wheel (13) and the rear wheel (14) away from the motor (10) are coaxially connected to sprockets. The two sprockets are fitted together with a chain (121).

6. The spraying device for electrical insulating coating according to claim 1, characterized in that: The auxiliary unit includes a lifting plate (151) and two auxiliary wheels (16). Multiple vertical guide rods (15) are fixedly connected to the bottom inner wall of the housing (1). The lifting plate (151) and the multiple guide rods (15) are slidably connected through each other. The two auxiliary wheels (16) are symmetrically installed on the lifting plate (151). The positions of the two auxiliary wheels (16) correspond to the front travel wheel (13) and the rear travel wheel (14). The bottom of the housing (1) is connected to a threaded rod (17) by a thread. The upper end of the threaded rod (17) is rotatably connected to the bottom of the lifting plate (151). The lower end of the threaded rod (17) is coaxially connected to a handwheel (18).

7. The spraying device for electrical insulating coating according to claim 1, characterized in that: The storage tank (27) is equipped with a pump body required for spraying operations.

8. A spraying device for electrical insulating coatings according to claim 1, characterized in that: The electrical equipment in the drive unit and spraying mechanism (2) can be powered by a storage battery or by a tethered power supply.

9. A method for spraying electrical insulating coatings, employing the spraying apparatus according to any one of claims 1-8, characterized in that: Includes the following steps: S1: Environmental Condition Confirmation Before construction, confirm that the ambient temperature is not lower than 5℃, the relative humidity is not higher than 80%, and there are no humid weather conditions such as fog, condensation, precipitation, snowfall, or wind and sand. S2: Surface Cleaning Before spraying, use a cable cleaning robot or cleaning drone to remove dust, oil and oxide layer from the surface of the pre-coated cable to ensure that the conductor surface is clean and dry. S3: Device wiring and pre-adjustment The entire spraying device is suspended on the bare cable to be sprayed, and the various mechanisms and units are adjusted to ensure proper installation and suspension. S4: Spraying Operation Start the spraying device and move it along the cable. During the spraying process, keep the coating uniform, without accumulation, dripping, bubbles, or missed areas. S5: Curing and Testing After spraying, allow the coating to cure at room temperature under ambient conditions; the cured coating should meet the following requirements: dielectric strength ≥ 20 kV / mm, volume resistivity ≥ 1 × 10⁻⁶. 12 Ω·m, adhesion ≥3.0MPa, flame retardant rating ≥FV-1.

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