A pipeline inner wall coating device

Abstract

The utility model relates to pipeline spraying technical field, concretely relates to a pipeline inner wall coating device, including frame, the first cylinder group and the second cylinder group for supporting the pipeline are sequentially arranged on the frame along the length direction, the axis of first cylinder group is perpendicular with pipeline axis, drives the pipeline to convey along the axial direction, the axis of second cylinder group is parallel with pipeline axis, drives the pipeline to rotate along the circumference, the support surface of second cylinder group is obliquely arranged, is used for supporting the pipeline and makes the pipeline axis and horizontal plane form the included angle, the first end of frame is provided with the paint supply device, the paint supply device corresponds the opening of pipeline and is located high end, supplies the anticorrosive paint to the pipeline inner wall, the second end of frame is provided with the collection device, the collection device corresponds the opening of pipeline and is located low end, recycles the anticorrosive paint that flows from the pipeline inner wall. The utility model is simple to operate, and the coating is even, and the quality and operation efficiency of anticorrosive coating have been improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of pipeline spraying technology, specifically to a pipeline inner wall coating device. Background Technology

[0002] Welded steel pipes, as key components for transporting fluids and gases and providing structural support, are constantly exposed to water, corrosive media, or harsh soil environments. Their inner walls are highly susceptible to electrochemical corrosion, leading to thinning, perforation, and even failure. To ensure pipeline structural safety, extend service life, and guarantee the purity of the transported media, applying anti-corrosion coatings to their inner walls has become a crucial protective measure in industries such as engineering construction and metallurgy.

[0003] Currently, the traditional methods for anti-corrosion treatment of the inner wall of such steel pipes mainly include: (1) manual brushing or spraying, which is inefficient, has poor coating uniformity, a harsh working environment, and causes a large waste of paint; (2) fixed centrifugal coating, which is only suitable for short pipes and cannot achieve continuous operation of long pipes, and the equipment has high energy consumption; (3) built-in crawling robot spraying, which is expensive, has a complex control system, and the robot body is easily contaminated by paint inside the pipe and malfunctions, making maintenance difficult.

[0004] Therefore, there is an urgent need for a pipe inner wall anti-corrosion treatment device that can achieve automation, uniform spraying, and high efficiency and energy saving. Summary of the Invention

[0005] This invention addresses the problems of low efficiency and uneven coating distribution in manual spraying of anti-corrosion paint for pipelines by providing a pipeline inner wall coating device that is easy to operate, provides uniform coating, and significantly improves the quality of the anti-corrosion coating and operational efficiency.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A pipe inner wall coating device includes a frame, on which a first roller group and a second roller group for supporting the pipe are arranged sequentially along the length direction. The axis of the first roller group is perpendicular to the axis of the pipe and drives the pipe to be conveyed axially. The axis of the second roller group is parallel to the axis of the pipe and drives the pipe to rotate circumferentially. The second roller assembly has an inclined support surface to support the pipe and create an angle between the pipe's axis and the horizontal plane. A paint supply device is located at the first end of the frame, corresponding to the high-end opening of the pipe, supplying anti-corrosion paint to the inner wall of the pipe. A collection device is located at the second end of the frame, corresponding to the low-end opening of the pipe, collecting the anti-corrosion paint flowing out of the inner wall of the pipe. The pipe is rotated by the external roller assembly, and the coating of the inner wall of the pipe is completed under the action of gravity, achieving automated operation and reducing the labor intensity of workers.

[0007] Furthermore, the support surfaces of both the first and second roller groups are V-shaped. The V-shaped support surfaces can naturally position and limit the pipes, adapting to different pipe diameters and enhancing the versatility and stability of the device.

[0008] Furthermore, the first roller assembly is horizontally positioned, while the second roller assembly is vertically oriented on the frame, allowing the pipe to switch between a horizontal and an inclined position. This structure enables the device to switch between a horizontal transport state and an inclined coating state, facilitating integration into automated production lines and improving production efficiency.

[0009] Furthermore, the second roller assembly is positioned at both ends of the frame, with the first roller assembly located between the second roller assemblies at both ends. This provides stable and reliable support for the pipeline, ensuring its smoothness during rotation and movement.

[0010] Furthermore, the first and second roller groups are arranged in a stepped manner on the frame, together forming an inclined support surface. This provides a simple, robust, and reliable fixed inclined implementation scheme that is low in cost and easy to manufacture and maintain.

[0011] Furthermore, a limiting block is also provided at the second end of the frame to prevent the pipe from slipping. This effectively prevents the pipe from slipping axially when tilted and rotated, improving the safety and reliability of the equipment operation.

[0012] Furthermore, the surfaces of the first and second roller groups are covered with a rubber layer. This increases friction, prevents the pipe from slipping, and avoids damage to the outer wall of the pipe.

[0013] Furthermore, the paint supply device includes a paint supply tank, a delivery pump, and a nozzle. The inlet of the delivery pump is connected to the paint supply tank via a pipeline, and the outlet of the delivery pump is connected to the nozzle via a pipeline. A control valve is installed on the pipeline to control the flow of paint. This achieves precise supply and quantitative control of the paint, ensuring the stability of the coating quality.

[0014] Furthermore, the collection device includes a liquid collection tank mounted on a frame below the pipeline. The liquid collection tank is connected to the paint supply device, and the recovered paint is transported back to the paint supply device. This achieves automatic recovery and recycling of excess paint, greatly reducing material waste, lowering costs, and meeting environmental protection requirements.

[0015] The beneficial effects of this utility model through the above technical solution are as follows: This invention features a first roller assembly that drives the axial transport of the pipeline and a second roller assembly that drives the circumferential rotation of the pipeline. This enables automated rotary coating of the pipeline in an inclined state, allowing the paint to flow evenly and adhere to the inner wall of the pipeline under the action of gravity and centrifugal force. Compared with built-in solutions such as robotic spraying, this avoids the risk of equipment being contaminated in a closed pipeline, and the resulting coating is continuous, uniform, and has low internal stress, effectively improving the coating quality.

[0016] This invention features a paint supply device and a collection device at both ends of the frame. The collection device recovers excess paint, while the paint supply device recycles the recovered paint, improving paint utilization, reducing material waste and environmental pollution, and lowering production costs. Furthermore, by employing a flow coating process instead of spraying, paint mist generation is avoided at the source, resulting in a more environmentally friendly working environment and meeting the requirements of green manufacturing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the first end of this utility model; Figure 2 This is a schematic diagram of the structure of the second end of this utility model; Figure 3 This is a schematic diagram of the arrangement of the roller assembly of this utility model; The attached diagram is labeled as follows: 1 is the frame, 2 is the first roller group, 3 is the second roller group, 4 is the paint supply device, 41 is the paint supply box, 42 is the nozzle, 5 is the collection device, 51 is the liquid collection tank, 52 is the return pipeline, and 8 is the pipe. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1-3 As shown, this embodiment provides a pipe inner wall coating device, including a frame 1, a first roller group 2, a second roller group 3, a paint supply device 4, and a collection device 5.

[0019] The frame 1 is a rigid frame welded from structural steel, and its overall structure is stable. The upper surface of the frame 1 is constructed as a continuous V-shaped guide groove, the angle of which is preferably 90 degrees, to accommodate and position pipes 8 of different diameters.

[0020] The frame 1 is provided with a first roller group 2 and a second roller group 3 for supporting the pipe 8 along its length. The first roller group 2 and the second roller group 3 are symmetrically installed on the two inclined sides of the V-shaped guide groove to form a V-shaped support surface.

[0021] The axis of the first roller group 2 is perpendicular to the axis of the pipe and is driven to rotate by a motor through a chain drive mechanism. The first roller group 2 drives the pipe 8 to be conveyed axially. Specifically, the first roller group 2 is symmetrically arranged on both sides of the inclined side of the V-shaped guide groove of the frame 1. The first roller group 2 includes multiple rows of rollers, and the axes of the multiple rows of rollers on the same inclined side are parallel to each other, and the axes of all rollers are perpendicular to the axial conveying direction of the pipe 8. Each roller is supported and fixed to the frame 1 by a central shaft and bearings. The multiple rows of rollers are linked by a chain drive mechanism and driven to rotate by a single motor, thereby driving the pipe 8 placed on it to move axially.

[0022] The axis of the second roller group 3 is parallel to the axis of the pipe, driving the pipe 8 to rotate circumferentially. Specifically, the second roller group 3 is also symmetrically arranged on the two inclined sides of the V-shaped guide groove of the frame 1. Its mechanical structure is similar to that of the first roller group 2, also including rollers mounted through a central shaft and bearings, and a chain drive mechanism. The roller direction of the second roller group 3 is perpendicular to the roller direction of the first roller group 2, that is, its roller axis is parallel to the axis of the pipe 8, and it is driven to rotate by another motor to drive the pipe 8 to rotate circumferentially around its own axis.

[0023] The support surface of the second roller group 3 is inclined to support the pipe 8 and make the axis of the pipe 8 form an angle with the horizontal plane.

[0024] As one possible implementation, as shown in the attached figures, the first roller assembly 2 and the second roller assembly 3 are arranged in a stepped manner on the frame 1, together forming an inclined support surface. The frame 1 itself is welded to a structure with a fixed inclination angle. The first roller assembly 2 and the second roller assembly 3 are fixedly installed in a stepped manner on the inclined frame 1, together forming a continuous and fixed inclined support surface for placing the pipe 8.

[0025] As another possible implementation, the first roller group 2 is horizontally arranged, and the second roller group 3 is vertically arranged on the frame 1 so that the pipe 8 can switch between a horizontal position and an inclined position.

[0026] Specifically, the main body of the frame 1 is a horizontal structure, and the V-shaped guide groove on it is correspondingly a horizontal groove. The first roller group 2 is directly fixedly installed in the horizontal V-shaped guide groove in the middle of the frame 1 through its support base. The rollers, bearings and transmission mechanism of the second roller group 3 are integrally installed on the lifting bases at both ends of the frame 1. The lifting bases can be driven by lifting mechanisms such as hydraulic cylinders or electric push rods to move vertically on the guide rails of the frame 1, so that the second roller group 3 can switch between the lowered position and the raised position.

[0027] The second roller group 3 is located at both ends of the frame 1, and the first roller group 2 is located between the second roller group 3 at both ends. When the second roller group 3 is in the lowered position, the pipe 8 is horizontally supported by the first roller group 2, which facilitates axial transportation. When the second roller group 3 is raised to the raised position, one end of the pipe 8 is lifted up, making it tilted, so that the rotary coating operation can be performed.

[0028] Preferably, a limiting block is provided at the second end of the frame 1 to prevent the pipe 8 from slipping. The limiting block is installed on the frame 1 by a vertical lifting mechanism and can move along the vertical guide rail between a "raised" working position and a "lowered" clearance position under the drive of a drive device such as a cylinder. A freely rotatable bearing is embedded on the impact surface of the limiting block. When the limiting block is in the working position, the lower end face of the pipe 8 contacts the outer ring of the bearing.

[0029] Preferably, the surfaces of the first roller group 2 and the second roller group 3 are both covered with a rubber layer to increase friction, prevent the pipe 8 from slipping, and avoid damage to the outer wall of the pipe 8.

[0030] The first end of the frame 1 is provided with a paint supply device 4. The paint supply device 4 corresponds to the opening at the high end of the pipe 8 and supplies anti-corrosion paint to the inner wall of the pipe 8. The paint supply device 4 includes a paint supply tank 41, a delivery pump and a nozzle 42. The inlet of the delivery pump is connected to the paint supply tank 41 through a pipeline, and the outlet of the delivery pump is connected to the nozzle 42 through a pipeline. A control valve for controlling the flow of paint liquid is provided on the pipeline.

[0031] Preferably, the nozzle 42 is mounted on the frame 1 via a hinged arm. The hinged arm can be driven by a drive component such as a cylinder, swinging to the working position during the coating process so that the nozzle 42 is aligned with the opening at the high end of the pipe 8; when the pipe 8 needs to be axially transported, it swings to the clearance position so that the nozzle 42 is completely removed from the movement path of the pipe 8.

[0032] A collection device 5 is provided at the second end of the frame 1. The collection device 5 corresponds to the opening at the lower end of the pipe 8 and recovers the anti-corrosion paint flowing out from the inner wall of the pipe 8. The collection device 5 includes a liquid collection tank 51 set on the frame 1 below the pipe 8. The liquid collection tank 51 is connected to the paint supply tank 41 of the paint supply device 4 through a return pipe 52, so as to transport the recovered paint back to the paint supply device 4 and realize the recycling of paint.

[0033] The working principle of this utility model: During operation, pipe 8 is placed on frame 1, supported by second roller assembly 3, and tilted. The second roller assembly 3 rotates, driving pipe 8 to rotate circumferentially. Simultaneously, the delivery pump of paint supply device 4 pumps paint from paint tank 41, supplying it through nozzle 42 to the opening at the high end of pipe 8. Under gravity, the paint flows downwards along the inner wall of pipe 8, and due to centrifugal force from the rotation of pipe 8, it is evenly coated across the entire inner wall. Excess paint not adhering to the pipe flows out from the lower opening of pipe 8, is collected by the collection tank 51 of collection device 5 below, and flows back to paint tank 41 for recycling. After coating is complete, second roller assembly 3 stops rotating, and first roller assembly 2 starts, driving pipe 8 axially to move it out of the workstation. Limiting blocks prevent pipe 8 from slipping during tilted rotation.

[0034] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A pipe inner wall coating device, characterized in that, Includes a frame (1), on which a first roller group (2) and a second roller group (3) for supporting the pipe (8) are arranged sequentially along the length direction. The axis of the first roller group (2) is perpendicular to the axis of the pipe and drives the pipe (8) to be conveyed axially. The axis of the second roller group (3) is parallel to the axis of the pipe and drives the pipe (8) to rotate circumferentially. The second roller group (3) is inclined to support the pipe (8) and make the axis of the pipe (8) form an angle with the horizontal plane. The first end of the frame (1) is provided with a paint supply device (4). The paint supply device (4) corresponds to the opening at the high end of the pipe (8) and supplies anti-corrosion paint to the inner wall of the pipe (8). The second end of the frame (1) is provided with a collection device (5). The collection device (5) corresponds to the opening at the low end of the pipe (8) and collects the anti-corrosion paint flowing out from the inner wall of the pipe (8).

2. The pipe inner wall coating device according to claim 1, characterized in that, The support surfaces of the first roller group (2) and the second roller group (3) are both V-shaped.

3. The pipe inner wall coating device according to claim 1, characterized in that, The first roller group (2) is set horizontally, and the second roller group (3) is set vertically on the frame (1) so that the pipe (8) can switch between a horizontal position and an inclined position.

4. The pipe inner wall coating device according to claim 1, characterized in that, The second roller group (3) is disposed at both ends of the frame (1), and the first roller group (2) is located between the second roller group (3) at both ends.

5. A pipe inner wall coating device according to claim 1, characterized in that, The first roller group (2) and the second roller group (3) are arranged in a stepped manner on the frame (1) to form an inclined support surface.

6. The pipe inner wall coating device according to claim 1, characterized in that, The second end of the frame (1) is also provided with a limiting block to prevent the pipe (8) from slipping.

7. A pipe inner wall coating device according to claim 1, characterized in that, The surfaces of the first roller group (2) and the second roller group (3) are covered with a rubber layer.

8. A pipe inner wall coating device according to claim 1, characterized in that, The paint supply device (4) includes a paint supply tank (41), a delivery pump and a nozzle (42). The inlet of the delivery pump is connected to the paint supply tank (41) through a pipeline, and the outlet of the delivery pump is connected to the nozzle (42) through a pipeline. A control valve for controlling the flow of paint is provided on the pipeline.

9. A pipe inner wall coating device according to claim 1, characterized in that, The collection device (5) includes a liquid collection tank (51) set on the frame (1) below the pipe (8). The liquid collection tank (51) is connected to the paint supply device (4) to transport the recovered paint back to the paint supply device (4).

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