A device for uniformly spraying coatings inside water engineering process pipelines

Abstract

This invention belongs to the field of pipeline inner wall spraying technology, specifically relating to a device for uniformly spraying coatings inside water engineering process pipelines; it includes a frame, a spraying unit, and two pipeline support units; the distance between the two pipeline support units is adjustable to accommodate the length of the pipeline; each pipeline support unit includes a support ring frame, and support wheels can move synchronously along the radial direction of the support ring frame to accommodate different pipe diameters; the support ring frame is divided into a fixed ring frame and a movable ring frame, the movable ring frame being hinged to the fixed ring frame and connected to an opening and closing mechanism; the spraying unit is located on one side of the two pipeline support units, and the spray nozzle of the spraying unit can move back and forth along the axis of the pipeline support unit; the distance between the two pipeline support units is adjustable, enabling support and rotation of pipelines of different lengths to adapt to various engineering needs; the support ring frame adopts an opening and closing design with a hinged connection between the fixed ring frame and the movable ring frame, facilitating the rapid insertion and removal of large-diameter pipelines.

Description

Technical Field

[0001] This invention belongs to the field of pipeline inner wall spraying technology, specifically relating to a device for uniformly spraying coatings inside water engineering process pipelines. Background Technology

[0002] Coating the inner walls of water conservancy pipelines is a key technical measure to ensure the safe and efficient operation of water conveyance systems. Because pipelines are constantly exposed to high-pressure water flow, high humidity, and corrosive media, their inner walls are susceptible to erosion, microbial growth, and scaling, leading to decreased water conveyance efficiency and accelerated structural aging. By spraying high-performance coatings such as epoxy phenolic, polyurethane, or ceramic coatings, a dense protective layer can be formed, significantly improving corrosion resistance, wear resistance, and antibacterial properties, while simultaneously reducing water flow resistance.

[0003] In the prior art, a pipe inner wall spraying device with authorization announcement number CN109013124B includes an externally arranged pipe to be sprayed, a movable mounting cylinder coaxially arranged in the middle of the inner part of the pipe to be sprayed, a number of guiding and adjusting movable structures extending at equal angles from the outer side of the movable mounting cylinder to cooperate with the inner wall of the pipe to be sprayed, a conical liquid storage cylinder extending from the left end of the movable mounting cylinder, and a liquid inlet pipe horizontally embedded in the middle of the left end of the conical liquid storage cylinder, a rotating pressure boosting material guiding structure embedded inside the movable mounting cylinder, and a conical spraying cylinder rotatably mounted on the right side of the movable mounting cylinder.

[0004] When applying the coating to the inner wall of a pipe, the aforementioned spraying device struggles to achieve uniform coverage across the entire pipe, often resulting in uneven coating distribution, missed areas, or overlapping coating. Furthermore, the inadequate pipe fixing and spraying equipment linkage adjustment mechanism makes the pipe prone to shifting during the spraying process, further impacting coating quality. Summary of the Invention

[0005] This invention aims to solve the problems of uneven spraying and easy displacement of pipelines during the spraying process in existing pipeline inner wall spraying devices.

[0006] This invention provides the following technical solution: a device for uniformly spraying coating inside water engineering process pipelines, comprising a frame, a spraying unit, and two pipeline support units;

[0007] Two pipe support units are arranged on the frame to support the pipes in a coordinated manner, and the spacing between the two pipe support units can be adjusted to accommodate the length of the pipes.

[0008] The pipe support unit includes a support ring frame, and support wheels distributed in the inner ring of the support ring frame are used to support the pipe. The support wheels can move synchronously along the radial direction of the support ring frame to adapt to different pipe diameters. The support ring frame is divided into a fixed ring frame and a movable ring frame. The movable ring frame is hinged to the fixed ring frame and connected to an opening and closing mechanism.

[0009] The spraying unit is located on one side of the two pipe support units, and the spray nozzle of the spraying unit can move back and forth along the axis of the pipe support unit.

[0010] Furthermore, the support ring frame is constructed with an annular groove facing the center of the support ring frame; support wheel guide mechanisms are distributed at intervals around the annular groove; the support wheel guide mechanism includes a guide frame, an arc plate and two slide rods;

[0011] The guide frame is fixed in the annular groove. A circumferential through groove is opened in the middle of the guide frame, and radial guide grooves are opened on both sides of the circumferential through groove. Two slide rods are slidably inserted into the two radial guide grooves of the guide frame respectively. The exposed ends of the two slide rods are connected to the push plate, and the support wheel is installed on the push plate.

[0012] The arc-shaped plate is movably nested in the circumferential through groove of the guide frame. The arc-shaped plate has an arc-shaped guide groove at the position of the guide frame, and the push rod connecting the two slide rods moves through the arc-shaped guide groove.

[0013] The arc-shaped plate is divided into a lower arc-shaped plate located in the fixed ring frame and an upper arc-shaped plate located in the movable ring frame; one end of the upper arc-shaped plate and the lower arc-shaped plate are rotatably connected, and the rotation axis is aligned with the hinge axis of the movable ring frame and the fixed ring frame, so that the upper arc-shaped plate can open and close with the movable ring frame.

[0014] Furthermore, the fixed ring frame has an arc-shaped through groove that connects to the annular groove, and the pull rod on the lower arc plate passes through the arc-shaped through groove and connects to the push-pull assembly.

[0015] Furthermore, the pipe support unit also includes a base, and one of the two pipe support units is fixed and the other is movable; the base of the fixed pipe support unit is fixed on the frame; the base of the movable pipe support unit is connected to a sliding seat on the frame, the sliding seat is in sliding engagement with a linear guide rod on the frame and in helical engagement with a lead screw on the frame; the lead screw is connected to a lead screw motor on the frame.

[0016] Furthermore, the opening and closing mechanism includes a pry bar, a second hydraulic cylinder, and a crossbeam; the crossbeam is fixed relative to the fixed ring frame, the pry bar is fixed on the movable ring frame, the lower end of the second hydraulic cylinder is hinged to the lug on the crossbeam, and a pin is fixed in the lug plate at the upper end of the second hydraulic cylinder, which is movably inserted into the elongated hole of the pry bar.

[0017] Furthermore, the spraying unit includes a paint supply mechanism and a vertical plate. A sleeve is rotatably inserted into the vertical plate, and an external threaded tube is movably inserted into the sleeve. The external threaded tube is screwed into a nut fixed on the vertical plate. The straight ribs on the inner wall of the sleeve slide in cooperation with the straight grooves on the external threaded tube. The sleeve is connected to a torque input mechanism. A nozzle is installed at the exposed end of the external threaded tube. The delivery pipe in the paint supply mechanism passes through the sleeve and the external threaded tube and connects to the nozzle.

[0018] Furthermore, the paint supply mechanism includes a storage tank, a delivery pump, a bend, an outer sleeve, and an inner tube; the delivery pump is connected to the storage tank; the inlet of the bend is connected to the delivery pump, and the outlet is connected to the outer sleeve via a rotary sealing joint; the outer sleeve is located inside the sleeve, and the inner tube is movably and sealedly inserted into the outer sleeve; the nozzle is connected to the outlet of the inner tube.

[0019] Furthermore, a gear ring is installed on the outside of the sleeve, and a motor is installed on the vertical plate, with the drive gear on the motor meshing with the gear ring.

[0020] Furthermore, the push-pull assembly includes a first hydraulic cylinder, the drive end of which is connected to a swing block on the pull rod.

[0021] Furthermore, the upper and lower arc-shaped plates are connected by a double-ended hinge plate; the upper rotation axis on the double-ended hinge plate is aligned with the hinge axis of the movable ring frame and the fixed ring frame.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] The adjustable spacing between the two pipe support units allows for the support and rotation of pipes of varying lengths, adapting to diverse engineering needs. The support ring frame features a hinged design connecting a fixed ring frame and a movable ring frame, facilitating the rapid insertion and removal of large-diameter pipes. The support wheels can be driven by a push-pull assembly to activate the arc-shaped plate linkage mechanism, enabling synchronous radial movement along the support ring frame. This adapts to pipes of different diameters and ensures the stability of the pipe's central axis position. Multiple support wheels are evenly distributed circumferentially along the annular groove, collectively supporting the pipe's weight and providing stable support. The spray nozzle of the spraying unit can move back and forth along the pipe's axis, ensuring uniform coating coverage along the pipe's length. The combination of axial movement and circumferential rotation of the nozzle achieves thorough, highly uniform spraying coverage of the pipe's inner wall surface. These effects directly improve the construction quality and efficiency of internal wall treatment projects such as pipe corrosion and rust prevention, demonstrating significant engineering application value. Attached Figure Description

[0024] Figure 1 A three-dimensional diagram of a device for uniformly spraying coatings inside process pipelines in water engineering.

[0025] Figure 2 A front view of a device for uniformly spraying coatings inside process pipelines in a water engineering project.

[0026] Figure 3 This is a schematic diagram showing the location of the pipe support unit;

[0027] Figure 4 This is a schematic diagram of a movable pipeline support unit;

[0028] Figure 5 This is an external schematic diagram of the pipe support unit;

[0029] Figure 6 This is a schematic diagram of the internal structure of the pipe support unit (first state).

[0030] Figure 7 This is a schematic diagram of the internal structure of the pipe support unit (second state).

[0031] Figure 8 This is a schematic diagram of a double-ended hinged plate;

[0032] Figure 9 This is a schematic diagram of the curved plate and the guide frame;

[0033] Figure 10 This is a schematic diagram of the guide frame;

[0034] Figure 11 This is a schematic diagram of the spraying unit;

[0035] Figure 12 This is a schematic diagram showing the fit between a nut and an externally threaded pipe.

[0036] Figure 13 This is a schematic diagram showing the fit between the sleeve and the externally threaded pipe.

[0037] Figure 14 This is a schematic diagram of the outer cannula and the inner cannula.

[0038] In the diagram: 1-Frame; 2-Base; 3-Radial guide groove; 4-Fixed ring frame; 5-Modible ring frame; 6-Lower arc plate; 7-Upper arc plate; 8-Double-end hinge plate; 9-Upper rotating shaft; 10-Conveying pump; 11-Circular through groove; 12-Guide frame; 13-Push plate; 14-Slide rod; 15-Support wheel bracket; 16-Support wheel; 17-Arc guide groove; 18-Push rod; 19-Support ear plate; 20-First hydraulic cylinder; 21-Swing block; 22-Arc through groove; 23-Tie rod; 24 - Crossbeam; 25- Ear seat; 26- Second hydraulic cylinder; 27- Pry bar; 28- Ear plate; 29- Pin; 30- Sliding seat; 31- Lead screw; 32- Linear guide rod; 33- Lead screw motor; 34- Vertical plate; 35- Sleeve; 36- External threaded pipe; 37- Nozzle; 38- Nozzle; 39- Nut; 40- Linear rib; 41- Linear groove; 42- Outer sleeve; 43- Bend; 44- Inner tube; 45- Motor; 46- Drive gear; 47- Gear ring; 48- Storage box. Detailed Implementation

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown: A device for uniformly spraying coating inside a water engineering process pipeline, comprising a frame 1, a spraying unit and two pipeline support units;

[0041] Two pipe support units are arranged on the frame 1 to support the pipes in a coordinated manner. The spacing between the two pipe support units can be adjusted to accommodate the length of the pipes.

[0042] The pipe support unit includes a support ring frame, with support wheels 16 distributed on the inner ring of the support ring frame to support the pipe. The support wheels 16 directly contact the outer wall of the pipe, clamping the pipe smoothly. The support wheels 16 can move synchronously along the radial direction of the support ring frame to adapt to different pipe diameters. The support ring frame is divided into a fixed ring frame 4 and a movable ring frame 5. The movable ring frame 5 is hinged to the fixed ring frame 4 and connected to an opening and closing mechanism. The opening and closing design of the movable ring frame 5 greatly simplifies the loading and unloading process of the pipe. Rotation clearance notches are provided at the hinge positions on the movable ring frame 5 and the fixed ring frame 4.

[0043] The spraying unit is located on one side of the two pipe support units. The nozzle 37 of the spraying unit can move back and forth along the axis of the pipe support unit, and the nozzle 37 can perform spraying operations along the entire length of the pipe.

[0044] like Figure 5 , Figure 6 , Figure 7 , Figure 9 , Figure 10 As shown: The support ring frame has an annular groove with the opening facing the center of the support ring frame; support wheel guide mechanisms are distributed at intervals around the annular groove; the support wheel guide mechanism includes a guide frame 12, an arc plate and two slide rods 14;

[0045] The guide frame 12 is fixed in the annular groove. A circumferential through groove 11 is opened in the middle of the guide frame 12, and radial guide grooves 3 are opened on both sides of the circumferential through groove 11. Two slide rods 14 are slidably inserted into the two radial guide grooves 3 of the guide frame 12 respectively. The two slide rods 14 can slide radially along the support ring frame. The exposed ends of the two slide rods 14 are connected to the push plate 13. The support wheel 16 is installed on the support wheel bracket 15 on the push plate 13. The sliding of the two slide rods 14 drives the support wheel 16 to move radially along the support ring frame.

[0046] The arc-shaped plate is movably nested in the circumferential through groove 11 of the guide frame 12. The arc-shaped plate can rotate around the axis of the supporting ring frame in the circumferential through groove 11. An arc-shaped guide groove 17 is opened on the arc-shaped plate at the position of the guide frame 12. The push rod 18 connecting the two slide rods 14 is movably inserted in the arc-shaped guide groove 17. When the arc-shaped plate rotates, it pushes and pulls the slide rod 14 through the arc-shaped guide groove 17, and the slide rod 14 moves with the push rod 18.

[0047] The support wheel guide mechanism is divided into one installed on the fixed ring frame 4 and the other installed on the movable ring frame 5. The support wheel guide mechanism installed on the movable ring frame 5 moves with the opening and closing of the movable ring frame 5.

[0048] The arc plate is divided into a lower arc plate 6 located in the fixed ring frame 4 and an upper arc plate 7 located in the movable ring frame 5; one end of the upper arc plate 7 and the lower arc plate 6 are rotatably connected, and the rotation axis is aligned with the hinge axis of the movable ring frame 5 and the fixed ring frame 4, so that the upper arc plate 7 can open and close with the movable ring frame 5.

[0049] The fixed ring frame 4 has an arc-shaped through groove 22 that connects to the annular groove. The pull rod 23 on the lower arc plate 6 passes through the arc-shaped through groove 22 and connects to the push-pull assembly. The push-pull assembly includes a first hydraulic cylinder 20. The drive end of the first hydraulic cylinder 20 is connected to the swing block 21 on the pull rod 23. The connecting end of the first hydraulic cylinder 20 is connected to the base 2 through the support ear plate 19. When the first hydraulic cylinder 20 extends or retracts, it pushes and pulls the lower arc plate 6 through the swing block 21 and the pull rod 23. The lower arc plate 6 rotates together with the upper arc plate 7, and the radial position of the support wheel 16 is adjusted synchronously.

[0050] like Figure 8 As shown: the upper arc-shaped plate 7 and the lower arc-shaped plate 6 are connected by a double-end hinged plate 8; as Figure 6 As shown, in the first state, the upper rotating shaft 9 on the double-ended hinge plate 8 is aligned with the hinge shafts of the movable ring frame 5 and the fixed ring frame 4; the upper arc-shaped plate 7 and the movable ring frame 5 can open and close synchronously. Figure 7 As shown, in the second state, the upper arc plate 7 and the lower arc plate 6 rotate to move the support wheel 16 radially. At this time, the upper rotating shaft 9 on the double-ended hinge plate 8 is misaligned with the hinge shaft of the movable ring frame 5 and the fixed ring frame 4. In the second state, when the upper arc plate 7 and the movable ring frame 5 are to be opened, the first hydraulic cylinder 20 pushes the upper arc plate 7 and the lower arc plate 6 to reset (return to the first state), that is, return to the state where the upper rotating shaft 9 is aligned with the hinge shaft of the movable ring frame 5 and the fixed ring frame 4.

[0051] like Figure 2 , Figure 4 As shown: The pipe support unit also includes a base 2. One of the two pipe support units is fixed, and the other is movable. The base 2 of the fixed pipe support unit is fixed to the frame 1. The base 2 of the movable pipe support unit is connected to a sliding seat 30 on the frame 1. The sliding seat 30 is in sliding engagement with a linear guide rod 32 on the frame 1 and in helical engagement with a lead screw 31 on the frame 1. The lead screw 31 is connected to a lead screw motor 33 on the frame 1. The distance between the two pipe support units is adjustable. The lead screw motor 33 drives the lead screw 31, which in turn pushes the sliding seat 30 to move. Adjusting the distance between the movable and fixed pipe support units allows for the support and rotation of pipes of different lengths, adapting to various engineering needs.

[0052] like Figure 5 As shown: The opening and closing mechanism includes a pry bar 27, a second hydraulic cylinder 26, and a crossbeam 24. The crossbeam 24 is fixed relative to the fixed ring frame 4 and is fixed on the base 2. The pry bar 27 is fixed on the movable ring frame 5. The lower end of the second hydraulic cylinder 26 is hinged to the lug seat 25 on the crossbeam 24. A pin 29 is fixed in the lug plate 28 at the upper end of the second hydraulic cylinder 26. The pin 29 is movably inserted into the elongated hole of the pry bar 27. When the second hydraulic cylinder 26 extends or retracts, the pin 29 slides in the elongated hole of the pry bar 27, pulling the pry bar 27 downward to lift the movable ring frame 5, or pushing the pry bar 27 upward to close the movable ring frame 5.

[0053] like Figure 11 , Figure 12 , Figure 13 , Figure 14 As shown: The spraying unit includes a paint supply mechanism and a vertical plate 34. A sleeve 35 is rotatably inserted into the vertical plate 34, and an externally threaded tube 36 is movably inserted into the sleeve 35. The externally threaded tube 36 is screwed into a nut 39 fixed on the vertical plate 34. The straight ribs 40 on the inner wall of the sleeve 35 are in sliding engagement with the straight grooves 41 on the externally threaded tube 36. The sleeve 35 is connected to a torque input mechanism. A nozzle 37 is installed at the exposed end of the externally threaded tube 36. The delivery pipe in the paint supply mechanism passes through the sleeve 35 and the externally threaded tube 36 to connect to the nozzle 37. A gear ring 47 is installed on the outside of the sleeve 35, and a motor 45 is installed on the vertical plate 34. The drive gear 46 on the motor 45 meshes with the gear ring 47. Motor 45 transmits torque to sleeve 35 via drive gear 46 and gear ring 47. Sleeve 35 transmits torque to externally threaded pipe 36 through the sliding engagement of straight ribs 40 and straight grooves 41. Externally threaded pipe 36 is responsible for converting rotational motion into linear motion. Nut 39 fixes the pipe. While rotating, externally threaded pipe 36 moves axially. The sliding engagement between the straight ribs 40 on the inner wall of sleeve 35 and the straight grooves 41 on externally threaded pipe 36 ensures that externally threaded pipe 36 can still receive torque input during linear motion. Spray head 37 moves and rotates axially with externally threaded pipe 36, achieving a highly uniform and seamless spray coating coverage of the inner wall surface of the pipe. Spray head 37 has nozzles 38 arranged at multiple angles.

[0054] The paint supply mechanism includes a storage tank 48, a delivery pump 10, a bend 43, an outer sleeve 42, and an inner tube 44. The delivery pump 10 is connected to the storage tank 48 and is used to pump paint. The inlet of the bend 43 is connected to the delivery pump 10, and the outlet is connected to the outer sleeve 42 through a rotary sealing joint. The outer sleeve 42 is located inside the sleeve 35 and rotates with the sleeve 35. The inner tube 44 is movably and sealed in the outer sleeve 42. The inner tube 44 moves with the nozzle 37 and is inserted and removed in the outer sleeve 42. The port of the inner tube 44 is connected to the nozzle 37.

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for uniformly spraying coatings inside water engineering process pipelines, characterized in that: Includes a frame (1), a spraying unit, and two pipe support units; Two pipe support units are arranged on the frame (1) to support the pipes in a coordinated manner. The distance between the two pipe support units can be adjusted to accommodate the length of the pipes. The pipe support unit includes a support ring frame, and support wheels (16) distributed in the inner ring of the support ring frame are used to support the pipe. The support wheels (16) can move synchronously along the radial direction of the support ring frame to adapt to different pipe diameters. The support ring frame is divided into a fixed ring frame (4) and a movable ring frame (5). The movable ring frame (5) is hinged to the fixed ring frame (4) and connected to the opening and closing mechanism. The spraying unit is located on one side of the two pipe support units, and the nozzle (37) of the spraying unit can move back and forth along the axis of the pipe support unit. The support ring frame is constructed with an annular groove facing the center of the support ring frame; a support wheel guide mechanism is distributed at intervals around the annular groove; the support wheel guide mechanism includes a guide frame (12), an arc plate and two slide rods (14). The guide frame (12) is fixed in the annular groove. A circumferential through groove (11) is opened in the middle of the guide frame (12). Radial guide grooves (3) are opened on both sides of the circumferential through groove (11). Two slide rods (14) are slidably inserted into the two radial guide grooves (3) of the guide frame (12). The exposed ends of the two slide rods (14) are connected to the push plate (13). The support wheel (16) is installed on the push plate (13). The arc plate is movably nested in the circumferential through groove (11) of the guide frame (12). An arc-shaped guide groove (17) is opened on the arc plate at the position of the guide frame (12). The push rod (18) connecting the two slide rods (14) moves through the arc-shaped guide groove (17). The arc plate is divided into a lower arc plate (6) located in the fixed ring frame (4) and an upper arc plate (7) located in the movable ring frame (5); one end of the upper arc plate (7) and the lower arc plate (6) are rotatably connected, and the rotation axis is coaxial with the hinge axis of the movable ring frame (5) and the fixed ring frame (4), so that the upper arc plate (7) can open and close with the movable ring frame (5); The upper arc plate (7) and the lower arc plate (6) are connected by a double-ended hinge plate (8); the upper arc plate (7) and the lower arc plate (6) include a first state and a second state; in the first state, the upper rotating shaft (9) on the double-ended hinge plate (8) is aligned with the hinge shaft of the movable ring frame (5) and the fixed ring frame (4); the upper arc plate (7) and the movable ring frame (5) can open and close synchronously; in the second state, the upper arc plate (7) and the lower arc plate (6) rotate to make the support wheel (16) move radially, at which time the upper rotating shaft (9) on the double-ended hinge plate (8) is misaligned with the hinge shaft of the movable ring frame (5) and the fixed ring frame (4); The fixed ring frame (4) has an arc-shaped through groove (22) that connects to the annular groove. The pull rod (23) on the lower arc plate (6) passes through the arc-shaped through groove (22) and connects to the push-pull assembly.

2. The device for uniformly spraying coatings inside water engineering process pipelines according to claim 1, characterized in that: The pipeline support unit also includes a base (2). One of the two pipeline support units is fixed and the other is movable. The base (2) of the fixed pipeline support unit is fixed on the frame (1). The base (2) of the movable pipeline support unit is connected to the sliding seat (30) on the frame (1). The sliding seat (30) is slidably engaged with the linear guide rod (32) on the frame (1) and helically engaged with the lead screw (31) on the frame (1). The lead screw (31) is connected to the lead screw motor (33) on the frame (1).

3. The device for uniformly spraying coatings inside water engineering process pipelines according to claim 1, characterized in that: The opening and closing mechanism includes a pry bar (27), a second hydraulic cylinder (26), and a crossbeam (24); the crossbeam (24) is fixed relative to the fixed ring frame (4), the pry bar (27) is fixed on the movable ring frame (5), the lower end of the second hydraulic cylinder (26) is hinged to the ear seat (25) on the crossbeam (24), and a pin (29) is fixed in the ear plate (28) at the upper end of the second hydraulic cylinder (26), and the pin (29) is movably inserted into the elongated hole of the pry bar (27).

4. The device for uniformly spraying coatings inside water engineering process pipelines according to claim 2, characterized in that: The spraying unit includes a paint supply mechanism and a vertical plate (34). A sleeve (35) is rotatably inserted on the vertical plate (34). An external threaded tube (36) is movably inserted into the sleeve (35). The external threaded tube (36) is screwed into a nut (39) fixed on the vertical plate (34). The straight ribs (40) on the inner wall of the sleeve (35) are slidably engaged with the straight grooves (41) on the external threaded tube (36). The sleeve (35) is connected to a torque input mechanism. A nozzle (37) is installed on the exposed end of the external threaded tube (36). The delivery pipe in the paint supply mechanism passes through the sleeve (35) and the external threaded tube (36) and connects to the nozzle (37).

5. A uniform coating spraying device for the interior of a water engineering process pipeline according to claim 4, characterized in that: The paint supply mechanism includes a storage tank (48), a delivery pump (10), a bend (43), an outer sleeve (42), and an inner tube (44); the delivery pump (10) is connected to the storage tank (48); the inlet of the bend (43) is connected to the delivery pump (10), and the outlet is connected to the outer sleeve (42) through a rotary sealing joint. The outer sleeve (42) is located inside the sleeve (35), and the inner tube (44) is movably and sealedly inserted into the outer sleeve (42). The nozzle (37) is connected to the nozzle (44).

6. The device for uniformly spraying coatings inside water engineering process pipelines according to claim 4, characterized in that: A gear ring (47) is installed on the outside of the sleeve (35), and a motor (45) is installed on the upright plate (34). The drive gear (46) on the motor (45) meshes with the gear ring (47).

7. A uniform coating spraying device for the interior of a water engineering process pipeline according to claim 1, characterized in that: The push-pull assembly includes a first hydraulic cylinder (20), the drive end of which is connected to the swing block (21) on the pull rod (23).

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