A large-diameter riser spraying drying device

Abstract

The utility model relates to the technical field of water-sealed conduit production, and disclose a kind of drying device for large-diameter water-sealed conduit spraying, including box and water-sealed conduit body.The device is integrated with a paint mist collection system, achieving the dual goals of environmental protection and automation.The fourth servo motor drives the air suction blade to rotate during spraying, generating negative pressure that draws the paint mist into the dust collection box through the first and second dust collection tubes of the dust collection shell, with a paint mist collection rate of over 90%.This effectively reduces VOCs concentration and improves the working environment.Meanwhile, the device integrates spraying, fixing, drying and purification functions, and is fully automated from conduit fixing, spraying to drying without human intervention.Only one person is needed to operate the equipment buttons to complete the work, and a single person can handle 8-10 conduits per day, reducing labor intensity by 60%.In addition, the paint receiving box can collect excess paint that drips, avoiding waste and pollution and further reducing production costs.

Description

Technical Field

[0001] This utility model relates to the field of water-resistant conduit production technology, specifically a drying device for spraying large-diameter water-resistant conduits. Background Technology

[0002] Large-diameter riser pipes are core components in offshore oil drilling and subsea pipeline laying. Their surfaces require coatings such as anti-corrosion paint and wear-resistant paint to resist seawater corrosion and mechanical wear. Currently, there are four major problems in the spraying and drying process of these riser pipes: Difficulty in fixing the conduit and poor adaptability: Traditional spraying often uses manual construction of brackets to fix the conduit, which cannot be adapted to large-diameter conduits of different diameters (0.5-2 meters), and the inner wall of the conduit is easily damaged during fixing; some fixing devices are rigid structures, which prevent the conduit from rotating during spraying, resulting in blind spots in the spraying, requiring frequent manual adjustment of the position, and a single person can only handle 2-3 conduits per day, which is extremely inefficient.

[0003] Low drying efficiency and unstable coating quality: Most existing drying equipment uses fixed heating tubes, which can only heat the conduit locally. Uneven drying results in coating curing time of up to 4-6 hours and is prone to the phenomenon of "surface cracking and internal undried". At the same time, there is a lack of drying distance adjustment function. If the distance is too close, the coating will easily burn. If the distance is too far, the drying efficiency will drop sharply, and the coating qualification rate is only 60%-70%.

[0004] Paint mist pollution is severe and the working environment is harsh: there is no effective collection device for the paint mist generated during the spraying process, and a large amount of volatile organic compounds (VOCs) diffuse into the working environment, which not only endangers the health of operators, but also adheres to the equipment surface and causes corrosion, increasing equipment maintenance costs.

[0005] Insufficient coordination between spraying and drying: Spraying and drying equipment are mostly independent devices, requiring manual transfer of the sprayed conduit to the drying equipment. During the transfer process, the undried coating is easily scratched and damaged, and the transfer time accounts for more than 30% of the total operation time, which seriously affects the continuity of production.

[0006] Therefore, there is an urgent need for a large-diameter waterproof conduit treatment device that can achieve "automatic fixing-spraying-drying-purification" in one integrated process to solve the above-mentioned industry pain points. Utility Model Content

[0007] The purpose of this invention is to provide a drying device for spraying large-diameter water-proof conduits, which solves the aforementioned background technical problems.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a drying device for spraying large-diameter water-proof conduit, comprising a box body and a water-proof conduit body, wherein a hydraulic telescopic rod is provided at the middle of the lower end of the outer wall on one side of the box body, and a first servo motor is provided at the middle of the lower end of the outer wall on the side of the box body away from the hydraulic telescopic rod, wherein a rotating rod is fixedly connected to the output end of the first servo motor, and a second servo motor is fixedly connected to both the output end of the hydraulic telescopic rod and one side of the rotating rod.

[0009] Preferably, the output end of the second servo motor is fixedly connected to a rotating plate. The outer wall of the rotating plate near the center of the housing is provided with multiple limiting grooves. The rotating plate is rotatably connected to a first connecting plate near the center of the housing. Limiting blocks are provided inside the limiting grooves. Telescopic rods are provided inside the first connecting plates. The telescopic rods are fixedly connected to the limiting blocks. The end of the telescopic rod away from the center of the first connecting plate extends through to the outside of the first connecting plate. A top plate is fixedly connected to the end of the telescopic rod away from the center of the first connecting plate. By setting the limiting grooves, the limiting blocks can move along the limiting grooves, thereby driving the telescopic rods to extend and retract, and driving the top plate at one end to fix the inner wall of the water-proof conduit body.

[0010] Preferably, a third servo motor is fixedly connected to the middle of the upper part of the outer wall of the housing near the first servo motor. A one-way threaded rod is fixedly connected to the output end of the third servo motor. The side of the one-way threaded rod away from the third servo motor is rotatably connected to the housing. A first threaded sleeve is fitted in the middle of the one-way threaded rod. An electric telescopic rod is provided inside the lower end of the first threaded sleeve. A second connecting plate is fixedly connected to the output end of the electric telescopic rod. The second connecting plate can be easily moved up and down by the electric telescopic rod.

[0011] Preferably, the front and rear ends of the upper surface of the second connecting plate are provided with first sliding grooves, and a bidirectional threaded rod is rotatably connected inside the second connecting plate. A second threaded sleeve is fitted at both ends of the bidirectional threaded rod. A rotating disk is fixedly connected to the front end of the bidirectional threaded rod. A drying plate is fixedly connected to the lower surface of the second threaded sleeve. Multiple copper rods are provided inside the drying plate, and multiple heating wires are provided inside the copper rods. The drying plate can be easily heated by the copper rods and heating wires.

[0012] Preferably, the lower end of the dust collection shell is fixedly connected to the front end of the top surface of the box, and multiple first dust collection pipes are provided. The upper ends of the first dust collection pipes all penetrate into the inner wall of the dust collection shell. A dust collection box is provided in the middle of the front end of the upper surface of the box. A first connecting pipe is provided on the side of the dust collection box near the first servo motor. A fourth servo motor is fixedly connected inside the first connecting pipe. A suction blade is fixedly connected to the output end of the fourth servo motor. Multiple ventilation holes are opened on the outer wall of the first connecting pipe near the first servo motor. A second dust collection pipe is provided in the middle of the front end of the dust collection box. The lower end of the second dust collection pipe penetrates into the interior of the dust collection shell. The suction force generated by the lower end of the second dust collection pipe penetrating into the interior of the dust collection shell can adsorb the paint mist into the interior of the dust collection box.

[0013] Preferably, a paint storage tank and a paint suction pump are respectively provided in the middle of the rear end of the upper surface of the box. A paint spray head is provided on the side of the second connecting plate near the first servo motor. A paint spray pipe is fixedly connected to the spraying end of the paint suction pump. The lower end of the paint spray pipe is fixedly connected to the paint spray head. A second connecting pipe is fixedly connected to the suction end of the paint suction pump. The rear end of the second connecting pipe extends into the interior of the paint storage tank. The fixed connection between the lower end of the paint spray pipe and the paint spray head, and the extension of the rear end of the second connecting pipe into the interior of the paint storage tank, facilitate paint spraying.

[0014] Preferably, a paint collection box is provided on the inner bottom surface of the box, and a first handle is fixedly connected to the middle of the front outer wall of the paint collection box. A second sliding groove is provided on the upper part of the rear end of the inner wall of the box, and a connecting plate is provided in the middle of the sliding groove. The connecting plate is fixedly connected to the second threaded sleeve. The paint collection box can be used to collect paint from the bottom surface, and the handle can be used to pull out the paint collection box. The second sliding groove and the connecting plate can prevent the first threaded sleeve from rotating when the unidirectional threaded rod rotates, thus improving the fit.

[0015] Preferably, both sides of the front end of the box are hinged to a switch door, and a transparent observation window is provided in the middle of the switch door. A second handle is fixedly connected to the middle of the outer wall of the front end of the switch door near the center of the box. The switch door and the handle can be used to open the box easily, and the transparent observation window can be used to observe the inside of the box during painting.

[0016] This utility model provides a drying device for spraying large-diameter water-proof conduits. It has the following beneficial effects: 1. This device significantly improves the spraying and drying effect and efficiency of large-diameter water-resistant conduits through the synergistic design of an adaptive fixing structure and an adjustable drying system. During the fixing stage, a second servo motor drives the rotating plate to rotate, and the limiting block slides along the limiting groove, causing the telescopic rod to extend and retract, ensuring the top plate is evenly fixed against the inner wall of the conduit. This design is suitable for conduits with diameters of 0.5-2 meters, and the fixing stability is 80% higher than traditional supports. During the drying stage, heating wires inside the drying plate heat the copper rod, and the generated heat is evenly applied to the surface of the sprayed conduit. Simultaneously, rotating the bidirectional threaded rod adjusts the distance between the two sets of drying plates. Combined with a third servo motor driving a unidirectional threaded rod to move the drying plates back and forth, this achieves full-surface drying without dead angles, reducing coating curing time to 1-1.5 hours. The operating efficiency is 3 times higher than traditional equipment, and the coating qualification rate is increased to over 95%.

[0017] 2. This device achieves the dual goals of environmentally friendly operation and automated operation through its paint mist collection system and integrated design. During spraying, the fourth servo motor drives the suction blades to rotate, and the resulting negative pressure draws the paint mist into the dust collection box through the first and second suction pipes of the dust collection housing. The paint mist collection rate reaches over 90%, effectively reducing VOCs concentration and improving the working environment. Simultaneously, the device integrates functions such as spraying, fixing, drying, and purification, with fully automated operation—from duct fixing and spraying to drying, no manual intervention is required. Only one person needs to operate the equipment buttons to complete the operation. A single person can handle 8-10 ducts per day, reducing labor intensity by 60%. Furthermore, the paint collection box collects excess dripping paint, avoiding waste and pollution, further reducing production costs. Attached Figure Description

[0018] Figure 1 This is a perspective view of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the structure of the first connecting pipe and other components of this utility model; Figure 3 This is a schematic cross-sectional view of the structure of the paint storage box of this utility model; Figure 4 This is a side sectional view of the structure of the second connecting plate of this utility model; Figure 5 for Figure 2 Enlarged view of point A in the middle; Figure 6 for Figure 4 Enlarged view of point B in the middle; Figure 7 for Figure 2 Enlarged diagram of point C in the middle.

[0019] In the diagram: 1. Box body; 2. Waterproof conduit body; 21. Hydraulic telescopic rod; 22. First servo motor; 23. Rotating rod; 24. Second servo motor; 25. Rotating plate; 26. Limiting groove; 27. First connecting plate; 28. Limiting block; 29. ​​Telescopic rod; 210. Top plate; 3. Third servo motor; 31. One-way threaded rod; 32. First threaded sleeve; 33. Electric telescopic rod; 34. Second connecting plate; 341. First sliding groove; 342. Two-way threaded rod; 343. Second threaded sleeve; 344. Rotating... 35. Drying plate, 351. Copper rod, 352. Heating wire, 36. Second slide, 37. Connecting plate, 4. Dust collection shell, 41. First dust collection pipe, 42. Dust collection box, 43. First connecting pipe, 431. Fourth servo motor, 432. Suction blade, 433. Ventilation port, 44. Second dust collection pipe, 5. Paint storage box, 51. Paint pump, 52. Spray head, 53. Spray pipe, 54. Second connecting pipe, 6. Paint receiving box, 61. First handle, 62. Opening and closing door, 63. Transparent observation window, 64. Second handle. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Example

[0022] A preferred embodiment of the large-diameter water-proof conduit spraying drying device provided by this utility model is, for example... Figure 1-7 As shown: A drying device for spraying large-diameter water-proof conduit includes a box body 1 and a water-proof conduit body 2. A hydraulic telescopic rod 21 is provided in the middle of the lower end of the outer wall of one side of the box body 1. A first servo motor 22 is provided in the middle of the lower end of the outer wall of the box body 1 away from the hydraulic telescopic rod 21. A rotating rod 23 is fixedly connected to the output end of the first servo motor 22. A second servo motor 24 is fixedly connected to the output end of the hydraulic telescopic rod 21 and one side of the rotating rod. The output end of the second servo motor 24 is fixedly connected to a rotating plate 25. The outer wall of the rotating plate 25 near the center of the housing 1 is provided with multiple limiting grooves 26. The rotating plate 25 near the center of the housing 1 is rotatably connected to a first connecting plate 27. The limiting grooves 26 are provided with limiting blocks 28. The first connecting plate 27 is provided with telescopic rods 29. The telescopic rods 29 are fixedly connected to the limiting blocks 28. The end of the telescopic rods 29 away from the center of the first connecting plate 27 extends through to the outside of the first connecting plate 27. The end of the telescopic rods 29 away from the center of the first connecting plate 27 is fixedly connected to a top plate 210. A third servo motor 3 is fixedly connected to the middle of the upper part of the outer wall of the housing 1 near the first servo motor 22. A one-way threaded rod 31 is fixedly connected to the output end of the third servo motor 3. The side of the one-way threaded rod 31 away from the third servo motor 3 is rotatably connected to the housing 1. A first threaded sleeve 32 is sleeved in the middle of the one-way threaded rod 31. An electric telescopic rod 33 is provided inside the lower end of the first threaded sleeve 32. A second connecting plate 34 is fixedly connected to the output end of the electric telescopic rod 33. The front and rear ends of the upper surface of the second connecting plate 34 are provided with first sliding grooves 341. The interior of the second connecting plate 34 is rotatably connected with a bidirectional threaded rod 342. Both ends of the bidirectional threaded rod 342 are fitted with second threaded sleeves 343. The front end of the bidirectional threaded rod 342 is fixedly connected with a rotating disk 344. The lower surface of the second threaded sleeves 343 is fixedly connected with a drying plate 35. The interior of the drying plate 35 is provided with multiple copper rods 351. The interior of each copper rod 351 is provided with multiple heating wires 352.

[0023] Furthermore, in this embodiment, during the spraying process, the drying plate 35 is heated by the heating wire 352 and the copper rod 351 to dry the sprayed water-proof conduit back and forth. This allows the sprayed paint to dry and solidify quickly, improving the overall working efficiency of the device. At the same time, by rotating the bidirectional threaded rod 342, the second threaded sleeve 343 is moved back and forth, thereby moving the drying plate 35 connected to the lower end back and forth. This makes it suitable for drying water-proof conduits of different sizes, and it is highly practical. Example

[0024] Based on Embodiment 1, a preferred embodiment of the drying device for spraying large-diameter water-resistant conduits provided by this utility model is as follows: Figure 1-7As shown: The front end of the top surface of the housing 1 is fixedly connected to the lower end of the dust collection shell 4, and multiple first dust collection pipes 41 are provided. The upper ends of the first dust collection pipes 41 all penetrate into the inner wall of the dust collection shell 4. The middle of the front end of the upper surface of the housing 1 is provided with a dust collection box 42. The side of the dust collection box 42 near the first servo motor 22 is provided with a first connecting pipe 43. The inside of the first connecting pipe 43 is fixedly connected to a fourth servo motor 431. The output end of the fourth servo motor 431 is fixedly connected to a suction blade 432. Multiple ventilation holes 433 are opened on the outer wall of the side of the first connecting pipe 43 near the first servo motor 22. The middle of the front end of the dust collection box 42 is provided with a second dust collection pipe 44, and the lower end of the second dust collection pipe 44 penetrates into the inside of the dust collection shell 4. A paint storage tank 5 and a paint suction pump 51 are respectively provided in the middle of the rear end of the upper surface of the housing 1. A paint spray head 52 is provided on the side of the second connecting plate 34 near the first servo motor 22. A paint spray pipe 53 is fixedly connected to the paint spray end of the paint suction pump 51. The lower end of the paint spray pipe 53 is fixedly connected to the paint spray head 52. A second connecting pipe 54 is fixedly connected to the paint suction end of the paint suction pump 51. The rear end of the second connecting pipe 54 extends into the interior of the paint storage tank 5. A paint receiving box 6 is provided on the inner bottom surface of the box 1. A first handle 61 is fixedly connected to the middle of the outer wall of the front end of the paint receiving box 6. A second sliding groove 36 is provided on the upper part of the rear end of the inner wall of the box 1. A connecting plate 37 is provided in the middle of the sliding groove 36. The connecting plate 37 is fixedly connected to the second threaded sleeve 343. Both sides of the front end of the housing 1 are hinged to a switch door 62. A transparent observation window 63 is provided in the middle of the switch door 62. A second handle 64 is fixedly connected to the middle of the side of the front outer wall of the switch door 62 near the center of the housing 1.

[0025] Furthermore, in this embodiment, when fixing the water-proof conduit body 2, the second servo motor 24 drives the rotating plate 25 to rotate. When the rotating plate 25 rotates, due to the limitation of the limiting groove 26, the limiting block 28 can only drive the telescopic rod 29 to extend and retract inside the limiting groove 26, thereby driving the top plate 210 to fix the inner wall of the water-proof conduit body 2 around the perimeter. This provides high stability and is convenient to adapt to water-proof conduits of different thicknesses. At the same time, after painting, the fourth servo motor 431 drives the suction blade 432 to rotate and suck air, which also facilitates the adsorption of paint mist in the box 1 into the dust collection box 42 through the first dust collection pipe 41.

[0026] In use, the water-proof conduit body 2 is placed between the two sets of first connecting plates 27 inside the box 1. The hydraulic telescopic rod 21 is activated to adjust the distance between the two ends of the second servo motor 24 to match the length of the conduit. Then, the second servo motor 24 is activated, and its output end drives the rotating plate 25 to rotate. The limiting groove 26 on the rotating plate forces the limiting block 28 to slide, thereby driving the telescopic rod 29 to extend outward, so that the top plate 210 tightly abuts against the inner wall of the conduit, completing the self-adaptive fixation. The first servo motor 22 is activated, and the fixed conduit is slowly rotated through the rotating rod 23 to prepare for subsequent uniform spraying.

[0027] The paint pump 51 next to the paint storage tank 5 is started, and paint is drawn through the second connecting pipe 54 and delivered to the spray head 52 on one side of the second connecting plate 34 through the spray pipe 53. At the same time, the third servo motor 3 is started, driving the one-way threaded rod 31 to rotate, so that the first threaded sleeve 32 drives the electric telescopic rod 33 and the second connecting plate 34 to move back and forth. The electric telescopic rod can adjust the height of the spray head to ensure that the spray head and the surface of the guide tube are kept at the optimal distance. The guide tube rotates under the drive of the first servo motor, and the spray head sprays paint evenly. Excess paint drips into the paint collection box 6 at the bottom of the tank for recycling.

[0028] The spraying and drying system is activated simultaneously: heating wire 352 heats copper rod 351, raising the temperature of drying plate 35 to the preset temperature; according to the diameter of the guide tube, the rotating disk 344 of the bidirectional threaded rod 342 is rotated, driving two sets of second threaded sleeves 343 to slide along the first slide groove 341, adjusting the distance between the drying plate and the guide tube; the third servo motor 3 drives the drying plate to move back and forth synchronously with the spray head, cooperating with the rotation of the guide tube to achieve all-round rapid drying of the sprayed coating, ensuring uniform curing of the coating.

[0029] During the spraying and drying process, the fourth servo motor 431 is started, and its output end drives the suction blade 432 to rotate inside the first connecting pipe 43. The negative pressure generated draws the paint mist in the box into the suction box 42 through the first suction pipe 41 and the second suction pipe 44 of the suction housing 4. The purified air is discharged from the vent 433. After the operation is completed, each motor and pump is turned off in sequence, and the second servo motor 24 is started in reverse to retract the top plate 210. The guide tube is released through the hydraulic telescopic rod 21, the processed guide tube is taken out, and the first handle 61 is pulled to take out the paint receiving box to clean the excess paint, thus completing one operation cycle.

[0030] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A drying device for spraying large-diameter water-proof conduit, comprising a housing (1) and a water-proof conduit body (2), characterized in that: A hydraulic telescopic rod (21) is provided at the middle of the lower end of the outer wall of one side of the box (1). A first servo motor (22) is provided at the middle of the lower end of the outer wall of the box (1) away from the hydraulic telescopic rod (21). A rotating rod (23) is fixedly connected to the output end of the first servo motor (22). A second servo motor (24) is fixedly connected to the output end of the hydraulic telescopic rod (21) and one side of the rotating rod.

2. The drying device for spraying large-diameter water-resistant conduit according to claim 1, characterized in that: The output end of the second servo motor (24) is fixedly connected to a rotating plate (25). The outer wall of the rotating plate (25) near the center of the housing (1) is provided with multiple limiting grooves (26). The rotating plate (25) near the center of the housing (1) is rotatably connected to a first connecting plate (27). The limiting groove (26) is provided with a limiting block (28). The first connecting plate (27) is provided with a telescopic rod (29). The telescopic rod (29) is fixedly connected to the limiting block (28). The end of the telescopic rod (29) away from the center of the first connecting plate (27) extends through to the outside of the first connecting plate (27). The end of the telescopic rod (29) away from the center of the first connecting plate (27) is fixedly connected to a top plate (210).

3. The drying device for spraying large-diameter water-resistant conduit according to claim 1, characterized in that: A third servo motor (3) is fixedly connected to the middle of the upper part of the outer wall of the housing (1) near the first servo motor (22). A one-way threaded rod (31) is fixedly connected to the output end of the third servo motor (3). The one-way threaded rod (31) is rotatably connected to the housing (1) on the side away from the third servo motor (3). A first threaded sleeve (32) is sleeved in the middle of the one-way threaded rod (31). An electric telescopic rod (33) is provided inside the lower end of the first threaded sleeve (32). A second connecting plate (34) is fixedly connected to the output end of the electric telescopic rod (33).

4. The drying device for spraying large-diameter water-resistant conduit according to claim 3, characterized in that: The front and rear ends of the upper surface of the second connecting plate (34) are provided with first sliding grooves (341). The interior of the second connecting plate (34) is rotatably connected with a bidirectional threaded rod (342). The two ends of the bidirectional threaded rod (342) are fitted with second threaded sleeves (343). The front end of the bidirectional threaded rod (342) is fixedly connected with a rotating disk (344). The lower surface of the second threaded sleeve (343) is fixedly connected with a drying plate (35). The interior of the drying plate (35) is provided with multiple copper rods (351). The interior of the copper rods (351) is provided with multiple heating wires (352).

5. A drying device for spraying large-diameter water-resistant conduit according to claim 1, characterized in that: The front end of the top surface of the box (1) is fixedly connected to the lower end of the dust collection shell (4), and multiple first dust collection pipes (41) are provided. The upper end of each first dust collection pipe (41) penetrates into the inner wall of the dust collection shell (4). A dust collection box (42) is provided in the middle of the front end of the upper surface of the box (1). A first connecting pipe (43) is provided on the side of the dust collection box (42) near the first servo motor (22). A fourth servo motor (431) is fixedly connected inside the first connecting pipe (43). A suction blade (432) is fixedly connected to the output end of the fourth servo motor (431). Multiple ventilation holes (433) are opened on the outer wall of the first connecting pipe (43) near the first servo motor (22). A second dust collection pipe (44) is provided in the middle of the front end of the dust collection box (42). The lower end of the second dust collection pipe (44) penetrates into the interior of the dust collection shell (4).

6. The drying device for spraying large-diameter water-resistant conduit according to claim 1, characterized in that: The middle part of the rear end of the upper surface of the box (1) is provided with a paint storage tank (5) and a paint suction pump (51). A paint spray head (52) is provided on the side of the second connecting plate (34) near the first servo motor (22). The paint spraying end of the paint suction pump (51) is fixedly connected to a paint spraying pipe (53). The lower end of the paint spraying pipe (53) is fixedly connected to the paint spray head (52). The paint suction end of the paint suction pump (51) is fixedly connected to a second connecting pipe (54). The rear end of the second connecting pipe (54) extends into the interior of the paint storage tank (5).

7. A drying device for spraying large-diameter water-resistant conduit according to claim 1, characterized in that: The inner bottom surface of the box (1) is provided with a paint receiving box (6), and a first handle (61) is fixedly connected to the middle of the front outer wall of the paint receiving box (6). A second sliding groove (36) is opened at the upper part of the rear end of the inner wall of the box (1), and a connecting plate (37) is provided in the middle of the sliding groove (36). The connecting plate (37) is fixedly connected to the second threaded sleeve (343).

8. A drying device for spraying large-diameter water-resistant conduit according to claim 1, characterized in that: Both sides of the front end of the box (1) are hinged to a switch door (62). A transparent observation window (63) is provided in the middle of the switch door (62). A second handle (64) is fixedly connected to the middle of the outer wall of the front end of the switch door (62) near the center of the box (1).

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