A device for uniform spraying of anticorrosive coating on the inner wall of a pipeline

Abstract

The application discloses a kind of pipeline inner wall anticorrosive coating uniform spraying device, specifically related to coating spraying field, including pipeline and spraying device body, spraying device body is set in the inside of pipeline, the side of spraying device body is provided with driving main shaft, the one end of driving main shaft is provided with self-adapting spraying assembly that can adjust spraying distance according to pipeline inner diameter, the top of self-adapting spraying assembly is provided with pipeline adaptive adjustment assembly that is adjusted according to different pipeline inner diameter corresponding adjustment.The application is by being provided with self-adapting spraying assembly, can be in the state of eccentric with pipeline, make spraying gun tube carry out dynamic displacement, to adjust the distance between with pipeline inner wall, to realize the uniform spraying of pipeline inner wall, and pipeline self-propelled ability, can avoid the situation of non-uniform moving speed, to avoid the situation that anticorrosive coating thickness is inconsistent and influences anticorrosion capacity occurs.

Description

Technical Field

[0001] This invention relates to the field of coating spraying technology, and more specifically, to a device for uniformly spraying an anti-corrosion coating on the inner wall of a pipe. Background Technology

[0002] Corrosion-resistant coatings on the inner walls of pipelines are a key technology for ensuring the long-term safe operation of oil and gas transportation, municipal water supply, and chemical media transmission pipelines. The quality of the coating application directly determines the pipeline's corrosion resistance and transportation efficiency. Currently, automated coating operations on pipeline inner walls mainly fall into two technical categories.

[0003] One type is the spraying device with walking capabilities, usually mounted on engineering robots or self-propelled vehicles. While this type of device solves the problem of displacement along the pipeline axis, its spray gun or spraying components are mostly fixed to one side of the vehicle body, lacking an automatic centering and rotation mechanism for the pipeline center. Because the inner wall of the pipeline has a circular cross-section, if the spray gun deviates from the center, it will result in inconsistent circumferential spraying distances, with the coating being too thick near the gun and too thin far from the gun, making it difficult to ensure the uniformity of film thickness in the annular area and seriously affecting the anti-corrosion performance.

[0004] Another type is the device capable of centered rotary spraying. It positions the spray gun along the pipe axis via a central support frame or tensioning mechanism, driving the nozzle to rotate and complete circumferential coating. However, this type of device often lacks autonomous propulsion and must rely on external traction equipment or manual dragging of cables to move it longitudinally along the pipe. This discontinuous traction method, due to unstable traction force and human error, easily leads to speed fluctuations, pauses, or shifting during movement. This results in overlapping or discontinuous spraying trajectories in the axial direction, causing obvious annular streaks or missed areas in the coating, ultimately leading to overall coating uniformity failure.

[0005] It is evident that existing spraying devices struggle to simultaneously achieve both the core functions of "centering rotational spraying" and "stable self-propelled movement." How to enable the spraying device to adapt to different pipe diameters and maintain the spray gun at the center of the pipe while rotating at a uniform speed without external traction is a pressing technical challenge in this field. Therefore, this application provides a device for uniformly spraying anti-corrosion coatings onto the inner wall of pipes to meet this requirement. Summary of the Invention

[0006] To address the technical problem that existing self-propelled spraying devices can achieve uniform longitudinal spraying but cannot perform rotational spraying at the center of the pipe, resulting in inconsistent coating thickness, this invention provides a device for uniformly spraying anti-corrosion coatings on the inner wall of pipes.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A device for uniformly spraying an anti-corrosion coating on the inner wall of a pipe includes a pipe and a spraying device body. The spraying device body is disposed inside the pipe. A drive spindle is disposed on one side of the spraying device body. An adaptive spraying component is disposed at one end of the drive spindle, which can adjust the spraying distance according to the inner diameter of the pipe. A pipe adaptation adjustment component is disposed at the top of the adaptive spraying component, which can be adjusted according to different inner diameters of the pipe. A spray gun adjustment component is disposed at the bottom of the adaptive spraying component, which can adjust the distance between the spray gun and the pipe. The adaptive spraying assembly includes a spindle support frame disposed at one end of the drive spindle, a movable adjustment frame slidably connected to the inner side of the spindle support frame, a roller disposed at the top of the movable adjustment frame, a spray gun barrel disposed at the bottom of the movable adjustment frame, and a limit spring fixedly connected to the inner side of the movable adjustment frame. The pipeline adaptation and adjustment assembly includes an adjusting nut rotatably connected inside the movable adjustment frame, and a second screw is threaded onto the inner side of the adjusting nut.

[0008] The adaptive spraying component can dynamically shift the spray gun nozzle when it is eccentric to the pipeline to adjust the distance between it and the inner wall of the pipeline, thereby achieving uniform spraying of the inner wall of the pipeline and avoiding the situation where the anti-corrosion coating thickness is inconsistent and affects the anti-corrosion capability.

[0009] In the above technical solution, further, a mounting frame is fixedly connected to the side of the spindle support frame near the drive spindle, the mounting frame is sleeved on one end of the drive spindle, and a fixing bolt is inserted through the drive spindle and the interior of the mounting frame.

[0010] In the above technical solution, furthermore, the four corners of the main shaft support frame are rotatably connected to limit wheels, and the multiple limit wheels are arranged in an abutting position with the movable adjustment frame.

[0011] In the above technical solution, the inner side of the spindle support frame is slidably connected to a limiting base, the movable adjustment frame is slidably connected to the outer side of the limiting base, and the limiting spring is fixedly connected to the top of the limiting base.

[0012] In the above technical solution, the bottom end of the movable adjustment frame is fixedly connected to a side connecting frame, one side of the side connecting frame is fixedly connected to a fixing sleeve, the spray gun tube is inserted into the inside of the fixing sleeve, and a fastening bolt is inserted into one side of the fixing sleeve.

[0013] In the above technical solution, the top of the movable adjustment frame is symmetrically provided with two limiting grooves, and the inner sides of the two limiting grooves are slidably connected with side limiting rods. The top of the side limiting rods is fixedly connected with a connecting end plate, and the roller is rotatably connected to the inner side of the connecting end plate.

[0014] In the above technical solution, the second screw is fixedly connected to the bottom of the connecting end plate, and the second screw is slidably connected inside the movable adjustment frame.

[0015] The pipe adaptation and adjustment component enables the device to be adapted to pipes of different inner diameters, allowing it to spray pipes of varying inner diameters.

[0016] In the above technical solution, the spray gun adjustment assembly further includes a first screw rotatably connected to the bottom of the limiting base, and a connecting base plate is fixedly connected to the bottom end of the movable adjustment frame. The first screw and the connecting base plate are threadedly connected.

[0017] The spray gun adjustment assembly can adjust the distance between the spray gun barrel and the inner wall of the pipe to meet different spraying needs.

[0018] The technical effects and advantages of this invention are as follows: 1. This invention, by setting an adaptive spraying component, allows the roller to slide correspondingly when it contacts the inner wall of the pipe. This enables the spray gun to adjust the distance between itself and the inner wall of the pipe under dynamic displacement, ensuring that the inner wall of the pipe is sprayed at a relatively stable distance even when it is not aligned with the pipe. This avoids inconsistent coating thickness on the inner wall of the pipe. Furthermore, the spraying device has self-propelled capabilities, which can prevent uneven movement and fluctuations that could lead to inconsistent uniformity of the pipe coating. 2. By setting up a pipe adaptation and adjustment component, the present invention enables the roller to contact the inner wall of pipes with different inner diameters when spraying, thereby improving the adaptability of the device during use. 3. By setting up a spray gun adjustment component, the height of the spray gun tube can be adjusted, thereby adjusting the distance between the spray gun tube and the inner wall of the pipe. This allows the spray gun tube to be adjusted according to actual needs, thus meeting various needs during spraying. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure when a uniform spraying device for anti-corrosion coating on the inner wall of a pipe is installed on the inner side of the pipe. Figure 2 A three-dimensional structural diagram of a device for uniformly spraying anti-corrosion coating on the inner wall of a pipeline. Figure 3 for Figure 2 Enlarged view of the A-section structure; Figure 4 for Figure 2 Enlarged view of the structure of section B; Figure 5 A side view of the main spindle support frame; Figure 6 This is a side sectional view of the main spindle support frame.

[0020] The attached diagram is labeled as follows: 1. Pipe; 2. Spraying device body; 3. Drive spindle; 4. Spindle support frame; 5. Mounting frame; 6. Fixing bolt; 7. Connecting base plate; 8. First screw; 9. Limiting base; 10. Movable adjustment frame; 11. Limiting spring; 12. Side connecting frame; 13. Fixing sleeve; 14. Fastening bolt; 15. Spray gun barrel; 16. Adjusting nut; 17. Second screw; 18. Connecting end plate; 19. Side limiting rod; 20. Limiting groove; 21. Roller; 22. Limiting wheel column. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Refer to the instruction manual appendix Figures 1-6 As shown in the figure, a pipe inner wall anti-corrosion coating uniform spraying device according to an embodiment of the present invention includes a pipe 1 and a spraying device body 2. The spraying device body 2 is a self-propelled spraying device, which belongs to the prior art and has been fully disclosed and will not be described in detail. The spraying device body 2 is set inside the pipe 1. A drive spindle 3 is set on one side of the spraying device body 2. An adaptive spraying component that can adjust the spraying distance according to the inner diameter of the pipe is set at one end of the drive spindle 3. A pipe adaptation adjustment component that adjusts the distance according to different inner diameters of the pipe is set at the top of the adaptive spraying component. A spray gun adjustment component that adjusts the distance between the spray gun and the pipe is set at the bottom of the adaptive spraying component. A mounting frame 5 is fixedly connected to the side of the spindle support frame 4 near the drive spindle 3. The mounting frame 5 is sleeved on one end of the drive spindle 3. A fixing bolt 6 is inserted through the drive spindle 3 and the mounting frame 5. The outer contour of the drive spindle 3 is adapted to the inner contour of the mounting frame 5.

[0023] The device is fixed to the end of the drive spindle 3 by fixing bolt 6. The simple installation method can reduce the installation threshold of the device, and it can be adapted to the drive end of the current self-propelled spraying device, reducing the installation difficulty and facilitating disassembly and maintenance in the future.

[0024] The adaptive spraying assembly includes a spindle support frame 4 disposed at one end of the drive spindle 3. A movable adjustment frame 10 is slidably connected to the inner side of the spindle support frame 4. A roller 21 is disposed at the top of the movable adjustment frame 10. A spray gun barrel 15 is disposed at the bottom of the movable adjustment frame 10. A limit spring 11 is fixedly connected to the inner side of the movable adjustment frame 10.

[0025] By installing the spray gun 15 at the bottom of the movable adjustment frame 10, the movable adjustment frame 10 can be adjusted to slide adaptively according to the inner wall of the pipe 1, thereby driving the spray gun 15 to spray the pipe 1 at a specific distance. The limiting spring 11 can ensure that the roller 21 is always in contact with the inner wall of the pipe 1, so as to achieve the purpose of adjusting the position of the movable adjustment frame 10 according to the inner wall of the pipe 1.

[0026] The four corners of the main spindle support frame 4 are rotatably connected to limit wheel columns 22. The multiple limit wheel columns 22 are all set in abutment with the movable adjustment frame 10. The inner side of the main spindle support frame 4 is slidably connected to the limit base 9. The movable adjustment frame 10 is slidably connected to the outer side of the limit base 9. The limit spring 11 is fixedly connected to the top of the limit base 9.

[0027] The limiting wheel column 22 can reduce the friction when the movable adjustment frame 10 slides, so that the movable adjustment frame 10 can slide smoothly inside the main shaft support frame 4.

[0028] The bottom of the movable adjustment frame 10 is fixedly connected to a side connecting frame 12. A fixing sleeve 13 is fixedly connected to one side of the side connecting frame 12. The spray gun tube 15 is inserted into the inner side of the fixing sleeve 13. A fastening bolt 14 is inserted into one side of the fixing sleeve 13. The fixing sleeve 13 is fastened by the fastening bolt 14, thereby clamping and fixing the spray gun tube 15 through the fixing sleeve 13. This setting makes the spray gun tube 15 detachable, so as to facilitate the replacement of the spray gun tube 15 during actual use, thereby meeting different spraying needs. At the same time, the detachable setting facilitates the maintenance of the spray gun tube 15 in the later stage. Two limiting grooves 20 are symmetrically opened at the top of the movable adjustment frame 10. Side limiting rods 19 are slidably connected to the inner side of the two limiting grooves 20. A connecting end plate 18 is fixedly connected to the top of the side limiting rods 19. A roller 21 is rotatably connected to the inner side of the connecting end plate 18.

[0029] It should be noted that, during the anti-corrosion spraying of the inner wall of pipe 1, the spraying device body 2 is placed inside pipe 1, and the roller 21 is in contact with the inner wall of pipe 1. At this time, starting the spraying device body 2 causes the drive spindle 3 to rotate, which in turn drives the spindle support frame 4 to rotate. The movable adjustment frame 10 follows the rotation of the spindle support frame 4, causing the roller 21 to roll on the inner wall of pipe 1. At this time, the rotation center point of the spindle support frame 4 is located below the center point of pipe 1. Under the adaptive displacement of the movable adjustment frame 10, the distance between the spray gun tube 15 and the inner wall of pipe 1 is brought close to its initial vertical distance for circumferential spraying. This ensures that even when the spray gun tube 15 is off-center from the center of pipe 1, the inner wall of pipe 1 is sprayed evenly. Specifically, as follows: When the movable adjustment bracket 10 is in a vertically upward position, the spray gun barrel 15 is vertically downward, which is the initial position. At this time, the distance between the roller 21 and the main shaft support frame 4 is the longest. As the roller 21 gradually approaches the horizontal center plane of the pipe 1, the distance between the spray gun barrel 15 and the inner wall of the pipe 1 gradually increases. However, due to the contact with the inner wall of the pipe 1, the roller 21 will cause the movable adjustment bracket 10 to slide inside the main shaft support frame 4. At the same time, the limiting spring 11 will contract, causing the roller 21 to gradually approach the main shaft support frame 4, and thus causing the spray gun barrel 15 to gradually move away from the main shaft support frame 4 and closer to the pipe 1. At the same time, when the roller 21 is below the main shaft support frame 4, due to the contact with the inner wall of the pipe 1, the roller 21 and the main shaft support frame 4 will slide together. The distance between the shaft support frames 4 is reduced to the shortest possible distance, while the spray gun 15 is pushed to the inner wall of the pipe 1 located above the main shaft support frame 4 at the maximum distance. This allows the spray gun 15 to adjust the distance between itself and the inner wall of the pipe 1 under dynamic displacement when spraying the inner wall of the pipe 1 in a circular rotation. This ensures that the spray gun 15 is always at a distance close to the initial position when spraying the pipe 1, so as to ensure that the inner wall of the pipe 1 is sprayed at a relatively stable distance even when not aligned with the pipe 1. This avoids inconsistent coating thickness on the inner wall of the pipe 1. Furthermore, the self-propelled capability of the spraying device body 2 can prevent uneven movement and fluctuations that could lead to inconsistent coating uniformity on the pipe 1.

[0030] It should be noted that dynamically adjusting the position of the spray gun barrel 15 by displacing the movable adjustment bracket 10 cannot guarantee that the spray gun barrel 15 will remain absolutely stationary. Figure 1 The distance between the center and the inner wall of pipe 1, when the spray gun barrel 15 is displaced in an arc, is relative to Figure 1The distance between the spray gun 15 and the pipe 1 will fluctuate slightly. This slight fluctuation is far from affecting the uniformity of the anti-corrosion coating thickness on the inner wall of the pipe 1. Therefore, by dynamically adjusting the spray gun 15 by moving the movable adjustment frame 10, the problem of uneven thickness of the anti-corrosion coating during spraying caused by the inability of the self-propelled spraying device to be aligned with the pipe 1 can be solved.

[0031] It should be noted that when the spraying device body 2 moves, the roller 21 rolls in a spiral shape on the inner wall of the pipe 1. Therefore, the moving speed of the spraying device body 2 should not be too fast, otherwise it will affect the normal movement of the roller 21.

[0032] Furthermore, the pipeline adaptation adjustment assembly includes an adjusting nut 16 rotatably connected inside the movable adjustment frame 10. The inner side of the adjusting nut 16 is threaded with a second screw 17. The second screw 17 is fixedly connected to the bottom of the connecting end plate 18 and slidably connected inside the movable adjustment frame 10. The side limiting rod 19 and the limiting groove 20 can restrict the movement direction of the connecting end plate 18, so that the connecting end plate 18 can only move up and down.

[0033] It should be noted that by manually rotating the adjusting nut 16, the second screw 17 can be screwed together with the second screw 17 to drive the connecting end plate 18 to move up and down. At the same time, the side limiting rod 19 moves synchronously inside the limiting groove 20. This allows the overall length of the connecting end plate 18 and the movable adjusting frame 10 to be adjusted. When spraying pipes 1 with different inner diameters, the roller 21 can be adjusted so that it can contact the inner wall of the pipes 1 with different inner diameters, thereby improving the adaptability of the device during use.

[0034] Furthermore, the spray gun adjustment assembly includes a first screw 8 rotatably connected to the bottom of the limiting base 9, and a connecting base plate 7 fixedly connected to the bottom end of the movable adjustment frame 10. The first screw 8 and the connecting base plate 7 are threadedly connected.

[0035] It should be noted that by rotating the first screw 8, which is connected to the connecting base plate 7 by threads, the first screw 8 can be raised and lowered, thereby driving the limiting base 9 to rise and fall inside the main shaft support frame 4. Since the movable adjustment frame 10 is supported by the limiting spring 11, and the limiting spring 11 is supported by the limiting base 9, and the spray gun 15 is installed at the bottom of the movable adjustment frame 10, when the height of the limiting base 9 is adjusted, the height of the spray gun 15 can be adjusted at the same time. This allows the distance between the spray gun 15 and the inner wall of the pipe 1 to be adjusted, so that the spray gun 15 can be adjusted according to actual needs, thereby meeting various needs during spraying.

[0036] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for uniformly spraying an anti-corrosion coating on the inner wall of a pipe, comprising a pipe (1) and a spraying device body (2), characterized in that, The spraying device body (2) is located inside the pipe (1). A drive spindle (3) is provided on one side of the spraying device body (2). An adaptive spraying component that can adjust the spraying distance according to the inner diameter of the pipe is provided at one end of the drive spindle (3). A pipe adaptation adjustment component that adjusts the distance between the spray gun and the pipe is provided at the top of the adaptive spraying component. The adaptive spraying assembly includes a spindle support frame (4) disposed at one end of the drive spindle (3), a movable adjustment frame (10) is slidably connected to the inner side of the spindle support frame (4), a roller (21) is provided at the top of the movable adjustment frame (10), a spray gun barrel (15) is provided at the bottom of the movable adjustment frame (10), and a limit spring (11) is fixedly connected to the inner side of the movable adjustment frame (10). The pipeline adaptation adjustment assembly includes an adjustment nut (16) rotatably connected inside the movable adjustment frame (10), and the inner side of the adjustment nut (16) is threaded with a second screw (17).

2. The pipe inner wall anti-corrosion coating uniform spraying device according to claim 1, characterized in that, The spindle support frame (4) is fixedly connected to a mounting frame (5) on the side near the drive spindle (3). The mounting frame (5) is sleeved on one end of the drive spindle (3). The drive spindle (3) and the mounting frame (5) are connected by a fixing bolt (6) through the interior of the mounting frame (5).

3. The pipe inner wall anti-corrosion coating uniform spraying device according to claim 1, characterized in that, The four corners of the main shaft support frame (4) are rotatably connected to limit wheel columns (22), and the multiple limit wheel columns (22) are all arranged in abutment with the movable adjustment frame (10).

4. The pipe inner wall anti-corrosion coating uniform spraying device according to claim 1, characterized in that, The inner side of the main shaft support frame (4) is slidably connected to the limiting base (9), the movable adjustment frame (10) is slidably connected to the outer side of the limiting base (9), and the limiting spring (11) is fixedly connected to the top of the limiting base (9).

5. The pipe inner wall anti-corrosion coating uniform spraying device according to claim 4, characterized in that, The bottom end of the movable adjustment frame (10) is fixedly connected to a side connecting frame (12), and a fixing sleeve (13) is fixedly connected to one side of the side connecting frame (12). The spray gun tube (15) is inserted into the inside of the fixing sleeve (13), and a fastening bolt (14) is inserted into one side of the fixing sleeve (13).

6. The pipe inner wall anti-corrosion coating uniform spraying device according to claim 1, characterized in that, The top of the movable adjustment frame (10) has two symmetrically opened limiting grooves (20), and the inner sides of the two limiting grooves (20) are slidably connected to side limiting rods (19). The top of the side limiting rods (19) is fixedly connected to a connecting end plate (18), and the roller (21) is rotatably connected to the inner side of the connecting end plate (18).

7. A uniform spraying device for anti-corrosion coating on the inner wall of a pipeline according to claim 6, characterized in that, The second screw (17) is fixedly connected to the bottom of the connecting end plate (18), and the second screw (17) is slidably connected inside the movable adjustment frame (10).

8. A uniform spraying device for anti-corrosion coating on the inner wall of a pipeline according to claim 4, characterized in that, The spray gun adjustment assembly includes a first screw (8) rotatably connected to the bottom of the limiting base (9), and a connecting base plate (7) is fixedly connected to the bottom end of the movable adjustment frame (10). The first screw (8) and the connecting base plate (7) are threadedly connected.

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