Uniform spraying device for anti-corrosion coating on inner wall of pipeline
By combining a laser rangefinder and an electric lifting system with a rotating spray pipe and bidirectional nozzles, the problems of coating uniformity and low construction efficiency of variable diameter pipes in traditional pipeline inner wall anti-corrosion construction are solved, achieving efficient and uniform anti-corrosion coating coverage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEIFANG WATER CONSERVANCY ARCHITECTURE DESIGN & RES INST CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-05-05
AI Technical Summary
In traditional pipeline internal wall corrosion protection construction, it is difficult to ensure the uniformity of coating, the construction efficiency of variable diameter pipelines is low, and existing equipment is difficult to adapt to changes in inner diameter, resulting in uneven coating thickness and high construction complexity.
By employing a laser rangefinder and an electric lifting system working in tandem, combined with a rotating spray pipe and bidirectional nozzle design, uniform coating mixing and automatic height adjustment are achieved. This ensures a constant distance between the spray unit and the pipe wall, forming a spiral covering trajectory, thus improving coating quality and construction efficiency.
It significantly improves coating thickness uniformity and construction efficiency, reduces construction complexity and equipment configuration costs, and ensures high-quality coverage of anti-corrosion coatings.
Smart Images
Figure CN224195052U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipeline engineering technology, specifically to a device for uniformly spraying an anti-corrosion coating onto the inner wall of a pipeline. Background Technology
[0002] In the construction of modern water conservancy infrastructure, large water transmission pipelines, such as those with a diameter ≥1m, are crucial. The quality of the anti-corrosion coating on the inner wall of these pipelines directly affects their service life and operational safety. Traditional pipeline internal wall anti-corrosion construction relies heavily on manual labor or semi-automated equipment, which presents the following challenges:
[0003] Coating uniformity is difficult to guarantee: Anti-corrosion coatings, such as epoxy resin and polyurethane, generally have high viscosity characteristics, which are prone to sedimentation and stratification in the tank, resulting in fluctuations in coating concentration during the spraying process, which in turn leads to defects such as uneven coating thickness and pinholes, affecting the anti-corrosion effect.
[0004] Construction efficiency of variable diameter pipelines is low: existing equipment is difficult to adapt to changes in the inner diameter of the pipeline, requiring frequent replacement of nozzles or adjustment of equipment parameters, and even segmented construction, resulting in extended construction period and soaring labor costs; in addition, the single-sided nozzle design requires multiple back-and-forth movements to achieve full coverage, which is not only inefficient, but also prone to missed areas due to insufficient overlap of spray trajectory; while increasing the number of spraying times will lead to excessive thickness due to paint accumulation.
[0005] To address the above issues, we propose a device for uniformly spraying anti-corrosion coatings onto the inner walls of pipes. Utility Model Content
[0006] In view of the problems existing in the prior art, this utility model discloses a device for uniformly spraying an anti-corrosion coating on the inner wall of a pipe. The technical solution adopted includes a trolley frame, a push handle is provided in the middle of the left side of the trolley frame, a moving component is provided at the bottom of the trolley frame, a material tank is fixedly installed at the top of the left inner side of the trolley frame, and the inside of the material tank is connected to the injection pipe provided at the top of the trolley frame. The bottom of the material tank is connected to the spraying unit provided at the right end of the trolley frame through a feeding component provided at the bottom of the inner side of the trolley frame. The spraying unit is rotatably installed at the center of the right end of the lifting platform provided at the right end of the trolley frame. A laser rangefinder sensor is fixedly installed in the middle of the left side of the lifting platform. Electric telescopic rods are respectively provided at the front and rear ends of the bottom of the lifting platform. The electric telescopic rods are respectively fixedly installed at the bottom of the inner side of the trolley frame, and the telescopic ends of the electric telescopic rods are fixedly connected to the bottom of the lifting platform.
[0007] As a preferred technical solution of this utility model, a second motor is provided at the top center of the material tank, and the second motor is fixedly installed at the top left end of the trolley frame. The output shaft of the second motor passes through the through hole provided at the top of the trolley frame and is fixedly connected to the top of the stirring paddle provided at the center inside the material tank.
[0008] As a preferred embodiment of this utility model, the spraying unit includes a rotating tube, a spraying tube, a driven gear ring for the spray nozzle, a drive gear, and a first motor. The rotating tube is rotatably installed in a rotating hole seat located at the center of the right end of the lifting platform. The right end of the rotating tube is connected to the spraying tube. Several spray nozzles are arranged in an equidistant array at both ends of the spraying tube. A driven gear ring is fixedly installed on the outer middle of the rotating tube. The first motor is located below the driven gear ring and is fixedly installed at the bottom of the lifting platform. A drive gear is fixedly installed at the end of the output shaft of the first motor, and the drive gear meshes with the teeth on the driven gear ring.
[0009] As a preferred technical solution of this utility model, the feeding assembly consists of a conveying pump, a suction pipe, a discharge pipe, and a conveying hose. The conveying pump is fixedly installed at the center of the bottom inner side of the trolley frame. The suction end of the conveying pump is provided with a suction pipe, and the other end of the suction pipe is connected to the bottom of the material tank. The discharge end of the conveying pump is provided with a discharge pipe, and the other end of the discharge pipe is connected to the left end of the rotating hole seat of the lifting platform through the conveying hose.
[0010] As a preferred technical solution of this utility model, the movable component includes casters, axles, a fixing block, and guide wheels. There are two casters, which are symmetrically arranged at the bottom right end of the trolley frame. A fixing block is fixedly installed at the center of the bottom left side of the trolley frame. An axle is rotatably installed in the middle of the fixing block. Guide wheels are fixedly installed at the front and rear ends of the axle.
[0011] As a preferred technical solution of this utility model, it also includes a controller, which is set on the top left side of the trolley frame. The output end of the controller is electrically connected to the input end of the first motor, the second motor and the electric telescopic rod, respectively. The input end of the controller is electrically connected to the output end of the laser rangefinder sensor and the mobile power supply set on the bottom left side of the trolley frame.
[0012] The beneficial effects of this invention are as follows: This invention ensures that the coating maintains uniform fluidity through a real-time stirring system, preventing high-viscosity anti-corrosion coatings from settling in the tank. This fundamentally solves the problem of uneven coating thickness caused by coating layering in traditional devices, significantly improving the quality and stability of the anti-corrosion coating. The laser ranging and electric lifting system work together to enable the spraying unit to automatically adjust its height in real time according to the inner diameter of the pipe, achieving high-precision spraying of variable-diameter pipes without manual intervention, greatly reducing construction complexity and equipment configuration costs. The rotating spraying pipe combined with a bidirectional nozzle design forms a spiral coverage trajectory inside the pipe. By optimizing the spray overlap rate and spray width, uniform coating coverage can be achieved in a single pass, improving construction efficiency. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0014] Figure 2 This is a schematic diagram of the structure of this utility model from below;
[0015] Figure 3 This is a schematic cross-sectional view of the present invention.
[0016] Figure 4 This is a partially enlarged structural diagram of part A of this utility model.
[0017] In the diagram: 1. Trolley frame; 2. Power supply; 3. Controller; 4. Material tank; 5. Spraying unit; 51. Rotary tube; 52. Spraying tube; 53. Spray nozzle; 54. Driven gear ring; 55. Drive gear; 56. First motor; 6. Second motor; 7. Agitator; 8. Conveying pump; 9. Material extraction pipe; 10. Material discharge pipe; 11. Conveying hose; 12. Lifting platform; 13. Electric telescopic rod; 14. Injection pipe; 15. Laser rangefinder sensor; 16. Moving component; 161. Casters; 162. Shaft; 163. Fixing block; 164. Guide wheel; 17. Push handle. Detailed Implementation
[0018] Example 1
[0019] like Figures 1 to 4As shown, this utility model discloses a device for uniformly spraying an anti-corrosion coating on the inner wall of a pipe. The technical solution adopted includes a trolley frame 1, with a push handle 17 located at the center of the left side of the trolley frame 1. A moving assembly 16 is located at the bottom of the trolley frame 1, comprising casters 161, a shaft 162, a fixing block 163, and guide wheels 164. Two casters 161 are provided, symmetrically arranged at the bottom right end of the trolley frame 1. A fixing block 163 is fixedly installed at the center of the bottom left side of the trolley frame 1. The shaft 162 is rotatably installed in the center of the fixing block 163. Guide wheels 164 are fixedly installed at both ends of the shaft 162. The casters 161 facilitate the operator's turning and movement of the trolley frame 1. The guide wheel 164 provides axial guidance for the trolley frame 1, facilitating its linear movement within the pipeline. A material tank 4 is fixedly mounted on the top left side of the trolley frame 1, and its interior is connected to the injection pipe 14 on the top of the trolley frame 1. The injection pipe 14 allows operators to easily inject anti-corrosion coating into the material tank 4. A second motor 6 is located at the center of the top of the material tank 4, and is fixedly mounted on the top left side of the trolley frame 1. The output shaft of the second motor 6 passes through a through hole on the top of the trolley frame 1 and is fixedly connected to the top of a stirring paddle 7 located at the center inside the material tank 4. By starting the second motor 6, its output shaft drives the stirring paddle 7 inside the material tank 4 to rotate, continuously stirring the coating to prevent sedimentation and maintain its fluidity. The bottom of the material tank 4 is open to... A feeding assembly located at the bottom inner side of the trolley frame 1 is connected to a spraying unit 5 located at the right end of the trolley frame 1. The feeding assembly consists of a conveying pump 8, a suction pipe 9, a discharge pipe 10, and a conveying hose 11. The conveying pump 8 is fixedly installed at the center of the bottom inner side of the trolley frame 1. The suction end of the conveying pump 8 is equipped with a suction pipe 9, and the other end of the suction pipe 9 is connected to the bottom of the material tank 4. The discharge end of the conveying pump 8 is equipped with a discharge pipe 10, and the other end of the discharge pipe 10 is connected to the left end of the rotating hole seat of the lifting platform 12 through the conveying hose 11. The conveying pump 8 draws paint from the bottom of the material tank 4 through the suction pipe 9, and conveys it to the rotating pipe 51 through the discharge pipe 10 and the conveying hose 11. The spraying unit 5 is rotatably installed at the center of the right end of the lifting platform 12 located at the right end inside the trolley frame 1. The spraying unit 5 includes a rotating tube 51, a spraying tube 52, nozzles 53, a driven gear ring 54, a driving gear 55, and a first motor 56. The rotating tube 51 is rotatably mounted in a rotating hole seat located at the center of the right end of the lifting platform 12. The right end of the rotating tube 51 is connected to the spraying tube 52. Several nozzles 53 are arranged in an equidistant array at both ends of the spraying tube 52. The driven gear ring 54 is fixedly mounted on the outer middle of the rotating tube 51. The first motor 56 is located below the driven gear ring 54 and is fixedly mounted on the bottom of the lifting platform 12. The driving gear 55 is fixedly mounted on the output shaft end of the first motor 56. The driving gear 55 meshes with the teeth on the driven gear ring 54, and the first motor 56 drives the driving gear 55 to rotate.The driven gear ring 54 drives the rotating tube 51 and the spraying tube 52 to rotate. The spray nozzles 53, symmetrically arranged at both ends of the spraying tube 52, spray paint out under centrifugal force, forming a bidirectional spraying coverage. A laser rangefinder 15 is fixedly installed on the middle left side of the lifting platform 12. Electric telescopic rods 13 are respectively installed at the front and rear ends of the bottom of the lifting platform 12. The electric telescopic rods 13 are fixedly installed on the inner bottom of the trolley frame 1, and their telescopic ends are fixedly connected to the bottom of the lifting platform 12. A controller 3 is also included, located on the top left side of the trolley frame 1. The output of the controller 3 is electrically connected to the input of the first motor 56, the second motor 6, and the electric telescopic rod 13. The input of the controller 3 is electrically connected to the output of the laser rangefinder 15 and the output of the mobile power supply 2 located at the bottom left of the inner side of the trolley frame 1.
[0020] The working principle of this utility model is as follows: First, the operator injects anti-corrosion coating into the material tank 4 through the injection pipe 14 at the top of the trolley frame 1, and starts the second motor 6. Its output shaft drives the stirring paddle 7 inside the material tank 4 to rotate, continuously stirring the coating to prevent sedimentation and maintain its fluidity. The device is pushed into the pipe inlet by the push handle 17 on the left side of the trolley frame 1. The universal wheels 161 and guide wheels 164 of the moving component 16 work together to move the equipment along the pipe axis. The laser range sensor 15 detects the distance between the inner wall of the pipe and the lifting platform 12 in real time. The controller 3 drives the electric telescopic rod 13 to extend and retract according to the data, automatically adjusting the height of the lifting platform 12 to ensure that the distance between the spraying unit 5 and the pipe wall is constant. Pump 8 draws paint from the bottom of tank 4 through suction pipe 9, and delivers it to rotary pipe 51 through discharge pipe 10 and conveying hose 11. First motor 56 drives drive gear 55 to rotate, which in turn drives rotary pipe 51 and spray pipe 52 to rotate through meshing driven gear ring 54. Spray nozzles 53, symmetrically arranged at both ends of spray pipe 52, spray paint out under centrifugal force, forming a bidirectional spray coating. When trolley frame 1 moves at a constant speed in the pipeline, the rotating spray pipe 52 generates a spiral spray trajectory to ensure coating overlap. When trolley frame 1 moves to the end of the pipeline, controller 3 shuts down first motor 56 and pump 8, stopping spraying. Operators pull the equipment out of the pipeline using push handle 17 to complete single-section construction.
[0021] The circuit connection involved in this utility model is a common method used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. It belongs to the widely used prior art.
[0022] Components not described in detail in this article are existing technologies.
[0023] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.
Claims
1. A device for uniformly spraying an anti-corrosion coating onto the inner wall of a pipe, comprising a trolley frame (1), wherein a push handle (17) is provided on the middle left side of the trolley frame (1), characterized in that, The bottom of the trolley frame (1) is provided with a moving component (16). A material tank (4) is fixedly installed on the top of the left inner side of the trolley frame (1), and the inside of the material tank (4) is connected to the injection pipe (14) provided on the top of the trolley frame (1). The bottom of the material tank (4) is connected to the spraying unit (5) provided on the right side of the trolley frame (1) through the feeding component provided on the bottom inner side of the trolley frame (1). The spraying unit (5) is rotatably installed at the center of the right end of the lifting platform (12) provided on the right side of the trolley frame (1). A laser range sensor (15) is fixedly installed on the middle left side of the lifting platform (12). Electric telescopic rods (13) are respectively provided at the front and rear ends of the bottom of the lifting platform (12). The electric telescopic rods (13) are respectively fixedly installed on the bottom inner side of the trolley frame (1), and the telescopic ends of the electric telescopic rods (13) are fixedly connected to the bottom of the lifting platform (12).
2. The device for uniformly spraying an anti-corrosion coating onto the inner wall of a pipe according to claim 1, characterized in that: The top center of the material tank (4) is provided with a second motor (6), and the second motor (6) is fixedly installed on the top left end of the trolley frame (1). The output shaft of the second motor (6) passes through the through hole provided on the top of the trolley frame (1) and is fixedly connected to the top of the stirring paddle (7) provided in the center inside the material tank (4).
3. The device for uniformly spraying an anti-corrosion coating onto the inner wall of a pipe according to claim 1, characterized in that: The spraying unit (5) includes a rotating tube (51), a spraying tube (52), a nozzle (53), a driven gear ring (54), a drive gear (55), and a first motor (56). The rotating tube (51) is rotatably installed in a rotating hole seat located at the center of the right end of the lifting platform (12). The right end of the rotating tube (51) is connected to the spraying tube (52). Several nozzles (53) are arranged in an equidistant array at both ends of the spraying tube (52). The driven gear ring (54) is fixedly installed in the middle of the outer side of the rotating tube (51). The first motor (56) is located below the driven gear ring (54). The first motor (56) is fixedly installed at the bottom of the lifting platform (12). The drive gear (55) is fixedly installed at the end of the output shaft of the first motor (56). The drive gear (55) meshes with the teeth on the driven gear ring (54).
4. The device for uniformly spraying an anti-corrosion coating onto the inner wall of a pipe according to claim 3, characterized in that: The feeding assembly consists of a conveying pump (8), a suction pipe (9), a discharge pipe (10), and a conveying hose (11). The conveying pump (8) is fixedly installed at the center of the bottom of the inner side of the trolley frame (1). The suction end of the conveying pump (8) is provided with a suction pipe (9), and the other end of the suction pipe (9) is connected to the bottom of the material tank (4). The discharge end of the conveying pump (8) is provided with a discharge pipe (10), and the other end of the discharge pipe (10) is connected to the left end of the rotating hole seat of the lifting platform (12) through the conveying hose (11).
5. The device for uniformly spraying an anti-corrosion coating onto the inner wall of a pipe according to claim 1, characterized in that: The moving component (16) includes casters (161), axle (162), fixing block (163), and guide wheels (164). There are two casters (161), which are symmetrically arranged at the bottom right end of the trolley frame (1). The fixing block (163) is fixedly installed at the center of the bottom left side of the trolley frame (1). The axle (162) is rotatably installed in the middle of the fixing block (163). Guide wheels (164) are fixedly installed at the front and rear ends of the axle (162).
6. The device for uniformly spraying an anti-corrosion coating onto the inner wall of a pipe according to claim 1, characterized in that: It also includes a controller (3), which is located on the top left side of the trolley frame (1). The output of the controller (3) is electrically connected to the input of the first motor (56), the second motor (6) and the electric telescopic rod (13), respectively. The input of the controller (3) is electrically connected to the output of the laser rangefinder (15) and the mobile power supply (2) located on the bottom left side of the trolley frame (1).