An anti-corrosion coating spraying device for transport pipelines in marine environmental protection projects

Abstract

The present invention relates to the field of spraying devices, and discloses an anti-corrosion paint spraying device for a conveying pipeline of a marine environmental protection project, comprising a spray box body, a spray bracket provided on the top of the spray box body, two straightening rings provided on the spray bracket, a pipeline inserted through the two straightening rings, a spray frame provided on the spray bracket, a plurality of paint nozzles provided in the spray frame, and a paint cavity formed in the spray box body. The present application can solve the problems of bending and shaking easily occurring in flexible long conveying pipelines during the spraying process, and can maintain a stable straight line state of the pipeline in the spraying section by clamping and straightening it through a straightening mechanism, effectively eliminating the problems of unstable spraying distance and uneven coating thickness caused by flexible deformation of the pipeline, thereby significantly improving the uniformity and density of the anti-corrosion coating, and enhancing the adhesion and durability of the anti-corrosion layer.

Description

Technical Field

[0001] The present invention relates to the technical field of spraying devices, and in particular to an anti-corrosion coating spraying device for a conveying pipeline of a marine environmental protection project. Background Art

[0002] With the rapid development of marine engineering, the use of marine pipelines for transporting seawater, sewage, oil and gas, or chemical media is becoming increasingly widespread. These pipelines are typically long, with installations spanning several or even dozens of kilometers. To ensure ease of construction and performance, these pipelines are often constructed from new flexible materials such as high-density polyethylene (HDPE) and steel-wire composite pipe. Compared to traditional metal pipes, these materials offer greater flexibility and are more susceptible to bending and curvature changes during transportation, laying, and construction.

[0003] In order to extend the service life of pipelines in marine environments, it is usually necessary to apply anti-corrosion coatings on the outer surface of the pipelines. The existing long pipeline spraying technology mainly adopts two methods:

[0004] First, by setting a fixed spraying area, the conveying pipeline passes through the spraying area continuously for coating;

[0005] The second method is to use a manual handheld spray gun to move along the surface of the pipe to spray in sections.

[0006] However, in the continuous conveying spraying method, due to the certain flexibility of the long pipeline itself, the pipeline is prone to bending, curvature fluctuation and local jitter during the conveying process, resulting in the distance and angle between the nozzle and the pipeline surface constantly changing, and the spraying thickness cannot be kept consistent, which can easily cause spray leakage, accumulation or poor film formation, seriously affecting the uniformity and density of the anti-corrosion coating.

[0007] Although manual spraying is flexible, it is inefficient, has poor spraying consistency, and relies heavily on operator experience. It cannot meet the dual requirements of spraying quality and efficiency for large-scale, high-standard engineering projects. Summary of the Invention

[0008] In view of the deficiencies of the prior art, the present invention provides an anti-corrosion coating spraying device for a transmission pipeline of a marine environmental protection project, aiming to alleviate the above-mentioned problems at least to a certain extent.

[0009] The above technical objectives of the present invention are achieved through the following technical solutions:

[0010] A device for spraying anti-corrosion paint for conveying pipelines in marine environmental protection projects comprises a spray box, a spray bracket is provided on the top of the spray box, two straightening rings are provided on the spray bracket, the pipeline is inserted into the two straightening rings, a spray frame is provided on the spray bracket, a plurality of paint nozzles are provided in the spray frame, a paint cavity is formed in the spray box, a spray mechanism for conveying paint to the nozzle is provided between the paint cavity and the paint nozzle, a straightening mechanism is provided in the straightening ring, the straightening mechanism can clamp and straighten the pipeline so that a section of the pipeline between the two straightening rings is straightened, when the spray frame moves to any straightening ring position, the straightening mechanism relaxes the pipeline, a conveying mechanism is also provided on the spray bracket, the conveying mechanism can convey a predetermined length of the pipeline when the spray frame moves to any straightening ring position, a moving mechanism is provided between the spray bracket and the spray frame, for driving the spray frame to move between the two straightening rings along the spray bracket, the moving mechanism can stop moving after moving the spray frame to any straightening ring position.

[0011] Preferably, the moving mechanism includes a slide rail connected to the spray bracket, a screw a is rotatably connected to the slide rail, a slider threadedly engaged with the screw a is slidably connected to the slide rail, the spray frame is connected to the slider, and the spray bracket is also connected to a motor a, and the drive shaft of the motor a is connected to the screw a.

[0012] Preferably, the spraying mechanism includes a pump a connected to the paint chamber, a spray pipe a is connected to the pump a, the spray pipe a is a hard pipe, a spray chamber is formed in the spray frame, the paint nozzle is connected to the spray chamber, a spray pipe b is connected to the spray chamber, the spray pipe b is a hard pipe, and a hose is connected between the spray pipe a and the spray pipe b.

[0013] Preferably, the conveying mechanism includes a driving ring and a stationary ring provided on the spraying bracket, which are coaxial with the two straightening rings, a plurality of driving wheels are rotatably connected in the driving ring, a motor b is connected to the driving ring, the driving shaft of the motor b is connected to the driving wheel, and a plurality of driven wheels are rotatably connected in the stationary ring.

[0014] Preferably, the stationary ring is connected to a damping cylinder, the shaft of the driven wheel extends into the damping cylinder and is connected to a damping plate, a plurality of holes are formed on the damping plate, and the damping cylinder is filled with damping grease.

[0015] Preferably, the straightening mechanism includes a compression frame arranged in the straightening ring, the compression frame is connected to a spring telescopic frame, the spring telescopic frame is slidably connected in the straightening ring, the inner wall of the straightening ring is connected to a top contact block, and the top of the compression frame is connected to a trapezoidal bar.

[0016] Preferably, the straightening mechanism also includes a pressure ring connected to one side of the straightening ring, an elastic member is connected between the pressure ring and the straightening ring, the pressure ring is arranged on the side of the straightening ring close to the spray frame, one side of the pressure ring is connected to a connecting shaft extending into the straightening ring, a screw b is rotatably connected inside the straightening ring, a spiral opening is provided on the screw b, a guide rod inserted into the spiral opening is connected to the connecting shaft, and the spring telescopic frame is threadedly engaged with the screw b.

[0017] Preferably, a plurality of rollers are rotatably connected to the pressing frame, a ratchet mechanism is provided between the rollers and the pressing frame, and a transmission member is provided between the two pressure rings.

[0018] Preferably, two infrared transmitters are provided on one side of the spraying bracket and two infrared receivers are provided on the other side. The signal emitted by the infrared generator is received by the infrared receiver. The signal path emitted by the infrared transmitter is in the gap between the pressure ring and the straightening ring. The spraying bracket is also provided with a controller, which is electrically connected to the motor a, the motor b and the pump a.

[0019] Preferably, a liquid cavity is further provided in the spray box, a water curtain cavity and a connecting cavity are provided on the spray bracket, a water curtain opening is provided at the bottom of the water curtain cavity, a water curtain plate is connected to the water curtain opening, a plurality of liquid nozzles are provided on the water curtain cavity, a pump b is provided in the liquid cavity, a water outlet pipe is connected to the pump b, and the water outlet pipe is connected to the connecting cavity, a reflux port is provided on the top of the spray box, and the water curtain plate extends into the reflux port.

[0020] In summary, the present invention mainly has the following beneficial effects:

[0021] This application can address the problems of flexible long conveying pipelines that are prone to bending and shaking during the spraying process. By clamping and straightening the pipeline through a straightening mechanism, the pipeline in the spraying section can remain in a stable straight state, effectively eliminating the problems of unstable spraying distance and uneven coating thickness caused by flexible deformation of the pipeline, thereby significantly improving the uniformity and density of the anti-corrosion coating and enhancing the adhesion and durability of the anti-corrosion layer.

[0022] At the same time, the moving mechanism drives the spray frame to move along the straightened pipe section, and combined with the multi-nozzle synchronous spraying structure in the spray frame, the spraying process is carried out at a constant distance and angle, further ensuring the film quality, reducing common defects such as leakage and accumulation, and ensuring the consistency and high standards of large-area continuous spraying construction.

[0023] Furthermore, by incorporating linkage control logic that relaxes the straightening mechanism when the spray frame moves to the straightening ring position, this device achieves separation and interlocking coordination between the spraying and pipeline transportation operations. This avoids the risks of jamming and strain caused by direct transportation in a clamped state, thereby improving the smoothness and reliability of pipeline transportation. The entire spraying and transportation process is orderly and non-interfering, significantly improving construction efficiency and reducing the need for manual intervention. It is suitable for high-quality, batch anti-corrosion spraying of long-length pipelines in marine engineering projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a cross-sectional schematic diagram of the overall structure of the present invention;

[0026] Figure 3 is another schematic diagram of the overall structure of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the mobile mechanism of the present invention;

[0028] Figure 5 It is a schematic diagram of the transmission structure of the present invention;

[0029] Figure 6 It is a schematic diagram of the drive ring structure of the present invention;

[0030] Figure 7 It is a schematic diagram of the stationary ring structure of the present invention;

[0031] Figure 8 It is a schematic structural diagram of the straightening ring of the present invention;

[0032] Figure 9 is a schematic cross-sectional view of the straightening ring structure of the present invention;

[0033] Figure 10 It is a schematic structural diagram of the compression frame of the present invention;

[0034] Figure 11 It is a schematic diagram of the roller structure of the present invention;

[0035] Figure 12 It is a schematic structural diagram of the ratchet mechanism of the present invention.

[0036] Reference numerals:

[0037] 100, spray box; 101, spray bracket; 102, straightening ring; 103, spray frame; 104, paint nozzle; 105, paint chamber;

[0038] 200, slide rail; 201, lead screw a; 202, slider; 203, motor a; 204, pump a; 205, spray pipe a; 206, spray chamber; 207, spray pipe b; 208, hose;

[0039] 300, driving ring; 301, stationary ring; 302, driving wheel; 303, motor b; 304, driven wheel; 305, damping cylinder; 306, damping plate; 307, hole;

[0040] 400, compression frame; 401, spring expansion frame; 402, top contact block; 403, trapezoidal bar; 404, pressure ring; 405, elastic member; 406, connecting shaft; 407, lead screw b; 408, spiral opening; 409, guide rod; 410, roller shaft; 411, ratchet mechanism; 412, transmission member;

[0041] 500, infrared transmitter; 501, infrared receiver; 502, controller; 503, liquid chamber; 504, water curtain chamber; 505, connecting chamber; 506, water curtain opening; 507, water curtain plate; 508, liquid nozzle; 509, pump b; 510, water outlet pipe; 511, reflux port. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] refer to Figures 1-12, a device for spraying anti-corrosion paint for a conveying pipeline of a marine environmental protection project, comprising a spray box 100, a spray bracket 101 is provided on the top of the spray box 100, two straightening rings 102 are provided on the spray bracket 101, the pipeline is inserted into the two straightening rings 102, a spray frame 103 is provided on the spray bracket 101, a plurality of paint nozzles 104 arranged around the circumference of the pipeline are provided in the spray frame 103, a paint cavity 105 is formed in the spray box 100, a spray mechanism for conveying paint to the nozzle is provided between the paint cavity 105 and the paint nozzle 104, a straightening mechanism is provided in the straightening ring 102, the straightening mechanism can clamp and straighten the pipeline so that the two A section of the pipe between the straightening rings 102 is straightened. When the spray frame 103 moves to the position of any straightening ring 102, the straightening mechanism relaxes the pipe. The spray bracket 101 is also provided with a conveying mechanism. The conveying mechanism can convey a predetermined length of the pipe when the spray frame 103 moves to the position of any straightening ring 102. A moving mechanism is provided between the spray bracket 101 and the spray frame 103 for driving the spray frame 103 to move between the two straightening rings 102 along the spray bracket 101. The moving mechanism can stop moving after moving the spray frame 103 to the position of any straightening ring 102, so that the conveying mechanism obtains the working time of conveying the predetermined length of the pipe.

[0044] With the above arrangement, when the device is used, one end of the conveying pipe is first inserted through the two straightening rings 102 provided on the spraying bracket 101. The conveying mechanism is activated to drive the pipe forward to the predetermined position. During the conveying process, the pipe passes through the two straightening rings 102 to preliminarily determine its direction.

[0045] Once a section of pipe has been delivered, the straightening mechanism within the straightening rings 102 clamps and straightens it, creating a substantially straight line between the two straightening rings 102. This clamping and straightening action effectively eliminates any bending caused by the pipe's inherent flexibility, maintaining a constant spray distance and circumferential uniformity in the spraying area. This improves the uniformity, density, and corrosion resistance of subsequent coatings.

[0046] After straightening is complete, the movement mechanism drives the spray frame 103 along the spray bracket 101, moving between the two straightening rings 102. Within the spray frame 103 are multiple coating nozzles 104 distributed along the circumference of the pipe. During movement, these nozzles 104 simultaneously spray anti-corrosion coating onto the outer surface of the pipe. Because the pipe remains stable and straight during spraying, and the distance between the nozzles and the pipe surface remains constant, a uniform, high-quality coating is formed, significantly improving the anti-corrosion effect and reducing localized leaks and buildup.

[0047] When the spray frame 103 moves to any straightening ring 102 position, the straightening mechanism is activated to relax the pipe and release the clamping state. At this time, the conveying mechanism is started to continue conveying the pipe for a predetermined length so that the new pipe section enters between the two straightening rings 102.

[0048] By loosening the spray frame 103 and the straightening mechanism upon reaching the straightening ring 102, problems such as pipe jamming, damage, or transmission anomalies caused by tightening the pipe during transportation can be effectively avoided, ensuring smooth and continuous transportation. The straightening mechanism then re-grips and straightens the new pipe section, and the spray frame 103 continues its reciprocating motion to spray the next section. This repetitive action allows for segmented straightening and high-quality anti-corrosion spraying of the entire long pipeline.

[0049] In addition, the device uses a conveying mechanism to transport the pipe to the spray bracket 101 and pass the pipe through two straightening rings 102. The straightening rings 102 provide basic spatial positioning and initial orientation. After the pipe is transported to its proper position, the conveying mechanism stops. As a prerequisite, the straightening mechanism immediately starts to clamp and straighten the pipe section between the two straightening rings 102, ensuring that the spraying section remains in a constant straight line. Only after the straightening mechanism completes the clamping and straightening process does the moving mechanism start, driving the spray frame 103 to move between the straightening sections along the spray bracket 101. The multiple nozzles distributed within the spray frame 103 evenly spray the outer surface of the pipe.

[0050] During the spraying operation, the straightening mechanism continues to maintain a clamping state, and the conveying mechanism is in a stopped state. The two form a mutually exclusive relationship, ensuring that the pipeline is stationary and straight during the spraying process, and preventing fluctuations in the spraying quality due to conveying movement or flexible deformation. When the spray frame 103 moves to any straightening ring 102 position, the moving mechanism immediately stops moving, which serves as a trigger condition for the conveying action; the straightening mechanism simultaneously releases the clamping state to free up physical space for pipeline transportation. After the straightening mechanism completes the loosening action, the conveying mechanism restarts and continues to convey the pipeline for a predetermined length to the new spraying section. After that, the straightening mechanism clamps and straightens again, and the spray frame 103 starts again to complete the next spraying operation.

[0051] Through this control coordination, the device achieves interlocking, conditional triggering, and mutually exclusive coordination among conveying, straightening, and the movement of the spray frame 103. This ensures that the pipeline remains stationary and straightened during the spraying operation, that conveying and spraying operations are performed separately, and that each action node is triggered by the previous state, eliminating conflicting actions or quality control issues. Compared to existing simple continuous conveying and spraying methods, this device ensures the density and consistency of the anti-corrosion coating and the high stability of the application process through the coordinated coordination of action flow control and mechanisms.

[0052] As a further embodiment of the present invention, the moving mechanism includes a slide rail 200 connected to the spraying bracket 101, a lead screw a201 being rotatably connected to the slide rail 200, a slider 202 being slidably connected to the slide rail 200 and threadedly engaged with the lead screw a201, the spraying frame 103 being connected to the slider 202, and a motor a203 being further connected to the spraying bracket 101, the drive shaft of the motor a203 being connected to the lead screw a201;

[0053] Through the above-mentioned arrangement, the motor a203 drives the lead screw a201 to rotate, and the lead screw a201 drives the slider 202 that is threadedly engaged with it to slide along the slide rail 200, thereby driving the spray frame 103 connected to the slider 202 to move along the spray bracket 101 between the two straightening rings 102, thereby achieving a smooth linear reciprocating motion of the spray frame 103. By adopting the matching structure of the slide rail 200, the lead screw a201 and the slider 202, not only is the precise guidance of the moving path of the spray frame 103 guaranteed, and the problem of uneven spraying caused by the offset and shaking of the spray frame 103 is avoided, but also the controllable adjustment of the spray speed can be achieved, ensuring that the relative distance and angle between the nozzle and the pipe surface are constant during the spraying process, thereby further improving the uniformity and density of the coating film, and enhancing the stability and anti-corrosion effect of the spraying operation. The overall structure is simple and reliable, with high motion transmission efficiency, suitable for long-term continuous operation, and improving the overall quality of the spraying construction and the operating life of the equipment.

[0054] As a further embodiment of the present invention, the spraying mechanism includes a pump a204 connected to the paint chamber 105, a spraying pipe a205 is connected to the pump a204, and the spraying pipe a205 is a hard pipe. A spraying chamber 206 is formed in the spray frame 103, and the paint nozzle 104 is connected to the spraying chamber 206. A spraying pipe b207 is connected to the spraying chamber 206, and the spraying pipe b207 is a hard pipe. A hose 208 is connected between the spraying pipe a205 and the spraying pipe b207;

[0055] Through the above-mentioned arrangement, pump a204 extracts paint from the paint chamber 105 and pushes the paint to flow through the spray pipe a205 connected thereto. As a hard pipe, the spray pipe a205 ensures that the feeding channel from pump a204 to the spray frame 103 has good strength and stability, and prevents the pipeline from shaking or breaking due to pressure pulsation. Between the spray pipe a205 and the spray frame 103, the spray pipe b207 is connected by a hose 208. The hose 208 part can buffer the vibration and micro-displacement generated by the spray frame 103 during movement, and effectively avoids the risk of the hard pipe being pulled or broken due to the rigid connection. The spray pipe b207 serves as a hard pipe for feeding the inside of the spray frame 103, is connected to the spray chamber 206, and finally evenly feeds the multiple nozzles distributed on the spray frame 103 through the spray chamber 206.

[0056] Through the combined structural design of hard pipe-hose 208-hard pipe, the overall stability of the paint delivery path and the uniformity of the feeding pressure are guaranteed, while taking into account the flexible buffering required when the spray frame 103 moves, thereby improving the reliability of the feeding system and ensuring continuous paint supply and uniform spraying during the spraying process, further improving the density of the anti-corrosion coating and the overall stability of the spraying construction.

[0057] As a further embodiment of the present invention, the conveying mechanism includes a driving ring 300 and a stationary ring 301 provided on the spraying bracket 101, which are coaxial with the two straightening rings 102. A plurality of driving wheels 302 are rotatably connected to the driving ring 300. A motor b303 is connected to the driving ring 300, and a drive shaft of the motor b303 is connected to the driving wheel 302. A plurality of driven wheels 304 are rotatably connected to the stationary ring 301.

[0058] Through the above-mentioned arrangement, the motor b303 drives the multiple driving wheels 302 arranged in the driving ring 300 to rotate through the driving shaft. The driving wheels 302 are in contact with the outer surface of the conveying pipe and generate friction thrust through their own rotation, pushing the pipe to be transported forward in the axial direction. The driving ring 300 is fixedly mounted on the spray bracket 101 and serves only as a mounting support structure for the driving wheel 302 and does not participate in the rotational movement. At the same time, the stationary ring 301 is also fixed on the spray bracket 101. The multiple driven wheels 304 inside it are in contact with the surface of the pipe, supporting the pipe through free rolling, limiting the radial deviation and shaking of the pipe during transportation, and further improving the stability of transportation. Through the active rotation of the driving wheel 302 and the support and guidance of the driven wheel 304, the present device can achieve stable and continuous transportation of flexible long conveying pipes.

[0059] As a further embodiment of the present invention, a damping cylinder 305 is connected to the stationary ring 301, and the shaft of the driven wheel 304 extends into the damping cylinder 305 and is connected to a damping plate 306. The damping plate 306 has a plurality of holes 307 formed therein, and the damping cylinder 305 is filled with damping grease.

[0060] With the above arrangement, when motor b303 drives drive wheel 302 to rotate the transmission pipeline, driven wheel 304 rotates accordingly. As driven wheel 304 rotates, damping plate 306 drives the grease to flow, continuously generating shear motion and localized pressure differentials in holes 307, creating a fluid damping force. When the conveying speed is high, driven wheel 304 rotates faster, significantly increasing the shear resistance experienced by damping plate 306 as it rotates in the grease. This prevents driven wheel 304 from accelerating too quickly, creating a rolling braking effect on the pipeline surface and effectively suppressing the pipeline's up-and-down bouncing and side-to-side swinging caused by inertia. When the conveying speed is slow, driven wheel 304 rotates slower, reducing the fluid resistance of damping plate 306 in the grease. This allows driven wheel 304 to adapt to slow rolling while maintaining a certain level of support resistance against the pipeline, preventing localized sagging or collapse of the pipeline due to slow conveying.

[0061] In the existing pipeline spraying technology, elastic support components are usually installed on the outside of the pipeline to apply radial compression force and increase the friction between the pipeline and the support wheel in order to provide a certain tension and posture stability. However, the elastic compression method has the following shortcomings: First, the friction resistance generated by the elastic support is a fixed value and cannot be dynamically adjusted according to the changes in the conveying speed. As a result, when the conveying speed is fast, the pipeline is prone to jumping and shaking due to inertia, affecting the conveying stability; when the conveying speed is slow, the elastic support force is not enough to effectively support the pipeline, which can easily lead to partial collapse of the pipeline or posture deformation. Secondly, the application of radial compression force for a long time can easily cause pressure and wear on the surface of the pipeline, reducing the structural integrity of the pipeline. In addition, the elastic support method is rough in control and it is difficult to fine-tune the dynamic changes of long flexible pipelines under different working conditions, and the overall stability and reliability are insufficient.

[0062] The present invention achieves damping control of the rotation of the driven wheel 304 by disposing a driven wheel 304 structure with a damping plate 306 and damping grease within a stationary ring 301, and adopts the principle of fluid shear resistance. Specifically, when the conveying speed is relatively fast, the rotation speed of the driven wheel 304 increases, and the damping plate 306 generates a relatively large shear resistance in the grease, effectively suppressing the driven wheel 304 from rotating too fast, preventing the pipeline from jumping or shaking due to inertial impact; when the conveying speed is relatively slow, the resistance to the damping plate 306 is reduced, and the driven wheel 304 can roll smoothly while maintaining appropriate support for the pipeline to avoid local collapse. Through this fluid damping mechanism based on adaptive changes in rotational speed, the present invention can dynamically adapt to changes in the pipeline conveying state at different conveying speeds without the need for complex sensing or control systems, thereby achieving stable control of the pipeline posture during the conveying process.

[0063] Compared with the traditional method of increasing friction by elastic support, the present invention can automatically adjust the support resistance under high and low speed transportation conditions, improve the stability and smoothness of pipeline transportation, reduce the spraying quality problems caused by vibration, jumping or collapse, protect the pipeline surface from pressure damage, and extend the service life.

[0064] As a further embodiment of the present invention, the straightening mechanism includes a compression frame 400 disposed in the straightening ring 102, a spring telescopic frame 401 being connected to the compression frame 400, the spring telescopic frame 401 being slidably connected in the straightening ring 102, a top contact block 402 being connected to the inner wall of the straightening ring 102, and a trapezoidal bar 403 being connected to the top of the compression frame 400;

[0065] Through the above arrangement, in the initial state, the top contact block 402 disposed within the straightening ring 102 presses inwardly on the trapezoidal bar 403 at the top of the pressure frame 400, causing the pressure frame 400 to move inward, thereby applying a clamping force to the conveying pipe. This, in conjunction with the pressure frame 400 structure disposed within the two straightening rings 102, achieves a secure clamping and preliminary straightening of a section of pipe. At this point, the pressure frame 400 is forcibly maintained in a compressed state by the connected spring expansion frame 401, with the spring in a compressed, extended position, storing a certain amount of potential energy.

[0066] When the spray frame 103 is driven by the moving mechanism to move to any position of the straightening ring 102, the spray frame 103 pushes the pressure frame 400 to produce an axial offset, causing the trapezoidal bar 403 at the top of the pressure frame 400 to gradually break away from the pressure of the top contact block 402. At this time, the spring telescopic frame 401 releases potential energy under the action of the elastic force, automatically driving the pressure frame 400 to move a distance away from the pipeline, thereby releasing the clamping of the conveying pipeline. Through this structural design, when the spray frame 103 moves to the position of the straightening ring 102, it can automatically trigger the pressure frame 400 to release the pipeline, reserving physical space for the next stage of conveying operations, avoiding the problems of conveying jams, scratches or abnormal resistance caused by the continuous clamping of the straightening structure.

[0067] Conversely, when the spray frame 103 leaves the straightening ring 102 after completing the spraying of the current section, the pressure frame 400, driven by the spring expansion frame 401, rebounds toward the original position of the spray frame 103. When it moves to the position of the top contact block 402, the trapezoidal bar 403 connected to its top is again compressed by the top contact block 402. At this time, the top contact block 402 positions the trapezoidal bar 403, forcing the pressure frame 400 to move toward the pipeline again, thereby re-clamping the pipeline. The spring expansion frame 401 compresses and stores energy, presetting potential energy for the next release action.

[0068] This automatic return and clamping mechanism allows for the timely positioning and straightening of a new section of pipe delivered to the straightening area after spraying a section of pipe. The entire clamping and release process is independent of external control components and is driven solely by the natural movement of the spray frame 103. This structure enables a cyclical, linked control of the pipe's automatic straightening, automatic release, and automatic re-straightening, enhancing the system's continuous operation and automation.

[0069] As a further solution of the present invention, the straightening mechanism also includes a pressure ring 404 connected to one side of the straightening ring 102, an elastic member 405 is connected between the pressure ring 404 and the straightening ring 102, the pressure ring 404 is provided on the side of the straightening ring 102 close to the spray frame 103, one side of the pressure ring 404 is connected to a connecting shaft 406 extending into the straightening ring 102, a lead screw b407 is rotatably connected in the straightening ring 102, a spiral opening 408 is provided on the lead screw b407, a guide rod 409 inserted into the spiral opening 408 is connected to the connecting shaft 406, and the spring telescopic frame 401 is threadedly engaged with the lead screw b407;

[0070] Through the above-mentioned setting, after the spray frame 103 moves to the position of the pressure ring 404, it continues to move forward a predetermined distance. Through the contact between the spray frame 103 and the pressure ring 404, the pressure ring 404 and the connecting shaft 406 connected to it are pushed in the direction away from the pipeline, and at the same time, the elastic part 405 connected between the pressure ring 404 and the straightening ring 102 is driven to produce compression deformation, thereby storing potential energy.

[0071] During this process, guide rod 409 moves linearly along the axial direction along with connecting shaft 406 and pressure ring 404. Guide rod 409 is inserted into the spiral opening 408 of lead screw b407. During this linear movement, spiral opening 408 forms a guiding constraint on guide rod 409, forcing lead screw b407 to rotate about its own axis. The linear movement of guide rod 409 and the coordinated structure of spiral opening 408 achieve synchronous linkage between the axial displacement of pressure ring 404 and the rotation of lead screw b407. Simultaneously, the rotation of lead screw b407, through threaded engagement with the spring telescopic frame 401, allows the spring telescopic frame 401 to shift, ultimately leaving the conveying pipe, thereby relaxing the conveying pipe. Conversely, after the conveying mechanism has moved the pipe a predetermined distance and then leaves the position of pressure ring 404, pressure ring 404, under the rebound action of elastic member 405, returns to its original position toward the conveying pipe, simultaneously driving connecting shaft 406, guide rod 409, and other components to move in the opposite direction. While the guide rod 409 undergoes reverse linear displacement in the spiral opening 408, the guiding effect of the spiral structure drives the lead screw b407 to rotate in the opposite direction. The rotation of the lead screw b407 causes the spring telescopic frame 401 to extend toward the pipeline through the threaded transmission relationship between the lead screw b407 and the spring telescopic frame 401. As the spring telescopic frame 401 extends, the compression frame 400 connected thereto is pushed forward toward the pipeline, and finally re-compresses and pushes the conveying pipeline to achieve automatic straightening of the new conveying section. This process does not require external power, and only relies on the movement of the spray frame 103 and the coordination of the structure to complete the cyclic switching of clamping and releasing. The action is stable and reliable, and the clamping timing is precise, ensuring the continuous stability of the pipeline posture in the spray section.

[0072] As a further solution of the present invention, a plurality of rollers 410 are rotatably connected to the pressing frame 400 , a ratchet mechanism 411 is provided between the rollers 410 and the pressing frame 400 , and a transmission member 412 is provided between the two pressing rings 404 ;

[0073] Through the above arrangement, the compression frame 400 is equipped with multiple rollers 410, enabling the compression frame 400 to uniformly clamp the pipe through multiple contact points when in compression. A ratchet mechanism 411 is provided between the rollers 410 and the compression frame 400, locking the rollers 410 during the clamping process and preventing them from rotating. This ensures rigid contact during clamping, achieving stable compression and effective straightening of the pipe, while avoiding issues such as weakened clamping force or offset straightening caused by the rollers 410 slipping.

[0074] After the straightening operation is completed, when the pressure frame 400 releases the pipe and releases the clamping state under the action of the movement of the spray frame 103, the ratchet mechanism 411 immediately allows the roller 410 to rotate freely in the direction of the pipe's propulsion, allowing the pipe to pass smoothly through the pressure frame 400 without forced sliding, reducing conveying resistance and protecting the pipe surface from wear. The provision of the ratchet mechanism 411 ensures rigid clamping during the straightening process and smooth rolling during the release process, balancing clamping stability and smooth conveying.

[0075] Furthermore, the transmission member 412 is a rack and pinion transmission assembly, with a rack structure provided on each of the two pressure rings 404, and a gear structure meshing between the two racks. When the spray frame 103 moves toward a pressure ring 404 and contacts the pressure ring 404, causing the pressure ring 404 to move axially, the rack structure provided thereon moves synchronously with the pressure ring 404 and meshes with the gear provided between the two pressure rings 404. Driven by the rack, the gear is forced to rotate. The rotation of the gear, through the meshing relationship with the rack of the pressure ring 404 on the other side, can simultaneously drive the pressure ring 404 on the opposite side to undergo synchronous displacement. Thus, by unidirectionally pushing the pressure ring 404 on one side by the spray frame 103, the two pressure rings 404 can be linked via the rack-and-pinion transmission mechanism, causing the linkage components (such as the connecting shaft 406, the lead screw b407, and the spring expansion frame 401) on the two pressure rings 404 to operate synchronously, thereby achieving the simultaneous release of the clamping state of the compression frame 400 located in the two straightening rings 102. This ensures that when the spray frame 103 moves to any position of the pressure ring 404, the two straightening mechanisms can relax in coordination, avoiding problems such as pipeline jamming and uneven rotational resistance caused by one side being released while the other side remains clamped, improving the smoothness and stability of the pipeline transportation process, and further enhancing the structural coordination and operational reliability of the system.

[0076] As a further embodiment of the present invention, two infrared transmitters 500 are provided on one side of the spraying bracket 101, and two infrared receivers 501 are provided on the other side. The signals emitted by the infrared transmitters are received by the infrared receivers 501. The signal path emitted by the infrared transmitters 500 is in the gap between the pressure ring 404 and the straightening ring 102. The spraying bracket 101 is also provided with a controller 502, which is electrically connected to the motor a203, the motor b303, and the pump a204.

[0077] Through the above configuration, the infrared transmitter 500 and infrared receiver 501 are fixedly mounted on either side of the spraying bracket 101, corresponding to each other. The infrared transmitter 500 continuously emits infrared signals, and the infrared receiver 501 is used to receive the signals from the infrared transmitter 500 in real time. The two form a detection path that spans the gap between the pressure ring 404 and the straightening ring 102. The controller 502 is electrically connected to the infrared transmitter 500, infrared receiver 501, motor a203, motor b303, and pump a204, forming a unified control loop.

[0078] The infrared transmitter 500 is continuously powered and transmits signals via the controller 502. The infrared receiver 501 provides real-time feedback on the status of the received signal to the controller 502. Based on the on / off status of the infrared receiver 501 signal, the controller 502 determines the position of the spray frame 103 in real time. When the infrared receiver 501 receives the signal, the controller 502 controls motor a203 to move the spray frame 103 along the spray bracket 101 between the two straightening rings 102. Simultaneously, it controls pump a204 to start feeding the spray head and initiate the spraying operation. At this time, motor b303 remains stopped to prevent interference between feeding and spraying.

[0079] When the spray frame 103 pushes the pressure ring 404 to move and blocks the infrared signal, the infrared receiver 501 cannot detect the infrared signal. Based on the signal interruption, the controller 502 immediately controls the motor a203 to stop, causing the spray frame 103 to stop moving. It also controls the pump a204 to stop spraying and controls the motor b303 to start, driving the conveying mechanism. After the motor b303's operating time or number of laps reaches a preset count, the controller 502 determines that the conveying has completed the predetermined length. It then controls the motor b303 to stop, controls the motor a203 to restart, drives the spray frame 103 to resume movement, and restarts the pump a204 to spray.

[0080] Through the above-mentioned connection and control logic, each unit equipment realizes automatic switching control based on the position status of the spray frame 103, ensuring the interlocking and timing coordination of the spraying, conveying, and straightening processes, avoiding action conflicts and fluctuations in spraying quality, and effectively improving the overall operation continuity, spraying consistency and operational reliability of the system.

[0081] Specifically, when the controller 502 detects that the signal from the infrared receiver 501 is received normally, it outputs an instruction to start the motor a203, controls the spray frame 103 to move along the spray bracket 101 at a set speed, and at the same time controls the pump a204 to start and supply material to the nozzle for spraying; at this time, the motor b303 remains in a stopped state to avoid pipeline transportation and spraying operations at the same time, thereby ensuring spraying stability.

[0082] When the infrared receiver 501 detects a signal interruption, the controller 502 immediately outputs instructions and performs the following operations simultaneously:

[0083] 1. Control motor a203 to stop, so that the spray frame 103 stops at the pressure ring 404 position;

[0084] 2. Control pump a204 to stop feeding and terminate the spraying operation;

[0085] 3. Start motor b303 to drive the conveying mechanism to operate and convey the pipeline at the set speed.

[0086] The drive of motor b303 is controlled by time counting or rotation counting. The controller 502 presets the operation time or number of rotations required to transport a predetermined length based on the conversion relationship between the diameter and circumference of the drive wheel 302 and the transport length per rotation of the transport pipe. For example, the controller 502 can set motor b303 to operate continuously for t seconds or to rotate n times to complete a predetermined length of transport.

[0087] During the conveying process, the controller 502 monitors the action time or number of revolutions of the motor b303 in real time. When the accumulated time or number of revolutions reaches a preset value, the controller 502 outputs a command to stop the action of the motor b303 and complete the conveying.

[0088] Then, the controller 502 automatically performs the following recovery operations:

[0089] 1. Control motor a203 to restart and drive the spray frame 103 to move along the spray bracket 101 between the two straightening rings 102;

[0090] 2. Control pump a204 to restart and resume paint spraying operation.

[0091] Through the above-mentioned execution steps, the controller 502 can realize continuous and efficient switching of spraying, conveying, and straightening operations based on automatic detection of the position of the spray frame 103 without human intervention, ensuring the coating quality of the anti-corrosion coating and the continuity of the operation rhythm, and improving the overall construction efficiency and system operation reliability.

[0092] It is worth noting that the infrared transmitter 500 is a light-emitting device for emitting infrared signals of a specific wavelength. It is typically composed of an infrared light-emitting diode (IR LED) and is capable of continuously emitting a narrow beam of infrared light forward. The infrared transmitter 500 in this application is mounted on one side of the spraying bracket 101 and continuously transmits infrared signals toward the infrared receiver 501, thereby establishing the optical path signal required for detecting the position of the spray frame 103. The infrared receiver 501 is a sensor component capable of receiving the infrared signals emitted by the infrared transmitter 500 and converting them into electrical signals for output. It typically includes an infrared photodiode or an infrared receiving module. The infrared receiver 501 in this application is mounted on the side of the spraying bracket 101 opposite the infrared transmitter 500. When the infrared signal is properly received, the infrared receiver 501 outputs a valid signal. When the infrared signal is blocked (e.g., when the spray frame 103 reaches its position), it outputs a failure signal, which is used to provide feedback to the controller 502 regarding the position of the spray frame 103. Controller 502 refers to an electronic control unit used to centrally manage and receive input signals, execute logical judgments, and output control instructions to actuators (such as motor a203, motor b303, and pump a204). It can be a programmable logic controller 502 (PLC), a single-chip microcomputer (MCU) control board, or a dedicated industrial control module. The controller 502 in this application receives the signal status feedback from the infrared receiver 501 and, based on the set control logic, controls the start and stop of motor a203, motor b303, and pump a204, respectively, coordinating the various operations of spraying, conveying, and movement of the spray frame 103 to ensure that the timing of each action is correct and does not interfere with each other. Through the above settings, the degree of automation of the system operation and the film consistency of the anti-corrosion spray construction can be improved, providing a reliable action coordination foundation and technical support for this application.

[0093] As a further embodiment of the present invention, a liquid chamber 503 is further provided in the spray box 100, a water curtain chamber 504 and a connecting chamber 505 are provided on the spray bracket 101, a water curtain opening 506 is provided at the bottom of the water curtain chamber 504, a water curtain plate 507 is connected to the water curtain opening 506, a plurality of liquid nozzles 508 are provided on the water curtain chamber 504, a pump b509 is provided in the liquid chamber 503, a water outlet pipe 510 is connected to the pump b509, and the water outlet pipe 510 is connected to the connecting chamber 505, a return port 511 is provided at the top of the spray box 100, and the water curtain plate 507 extends into the return port 511;

[0094] With the above arrangement, during use, pump b509 transports the liquid within liquid chamber 503 via outlet pipe 510 to connecting chamber 505, where it is then distributed from connecting chamber 505 to multiple liquid spray heads 508 disposed within water curtain chamber 504. Liquid spray heads 508 spray the liquid onto the sidewalls of water curtain chamber 504. After the liquid forms a uniform, flowing liquid film on the sidewalls, it flows downward under the influence of gravity along water curtain opening 506 at the bottom of water curtain chamber 504, reaching the surface of water curtain plate 507 connected to water curtain opening 506. The liquid further flows along the surface of water curtain plate 507, forming a continuous and stable water curtain layer, and is ultimately guided by water curtain plate 507 to flow back to reflux port 511 disposed at the top of spray chamber 100, completing the liquid recycling process.

[0095] In this application, the water curtain forms a continuously flowing liquid barrier on one side of the spraying area, which can weaken the diffusion tendency of the paint mist generated during the spraying process to a certain extent, and reduce the possibility of paint particles escaping to the external environment with the air flow, thereby helping to improve the air cleanliness near the spraying operation area and reduce the risk of paint deposition and pollution in the working environment.

[0096] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for spraying anti-corrosion coatings for transport pipelines in marine environmental protection projects, comprising a spray box (100), a spray bracket (101) being provided on the top of the spray box (100), characterized in that: Two straightening rings (102) are provided on the spraying bracket (101), and the pipeline is inserted into the two straightening rings (102). A spraying frame (103) is provided on the spraying bracket (101), and a plurality of paint nozzles (104) are provided in the spraying frame (103). A paint cavity (105) is formed in the spraying box (100), and a spraying mechanism for conveying paint to the nozzle is provided between the paint cavity (105) and the paint nozzle (104). A straightening mechanism is provided in the straightening ring (102), and the straightening mechanism can clamp and straighten the pipeline so that a section of the pipeline between the two straightening rings (102) is straightened. When the coating frame (103) moves to the position of any straightening ring (102), the straightening mechanism relaxes the pipeline. The spraying bracket (101) is also provided with a conveying mechanism, which can convey a predetermined length of the pipeline when the spraying frame (103) moves to the position of any straightening ring (102). A moving mechanism is provided between the spraying bracket (101) and the spraying frame (103) for driving the spraying frame (103) to move along the spraying bracket (101) between the two straightening rings (102). The moving mechanism can stop moving after the spraying frame (103) moves to the position of any straightening ring (102). The straightening mechanism comprises a compression frame (400) disposed in the straightening ring (102), the compression frame (400) being connected to a spring telescopic frame (401), the spring telescopic frame (401) being slidably connected in the straightening ring (102), the inner wall of the straightening ring (102) being connected to a top contact block (402), and the top of the compression frame (400) being connected to a trapezoidal bar (403); The straightening mechanism further comprises a pressure ring (404) connected to one side of the straightening ring (102), an elastic member (405) being connected between the pressure ring (404) and the straightening ring (102), the pressure ring (404) being arranged on a side of the straightening ring (102) close to the spray frame (103), one side of the pressure ring (404) being connected to a connecting shaft (406) extending into the straightening ring (102), a lead screw b (407) being rotatably connected in the straightening ring (102), a spiral opening (408) being provided on the lead screw b (407), a guide rod (409) being inserted into the spiral opening (408) being connected to the connecting shaft (406), and the spring telescopic frame (401) being threadedly engaged with the lead screw b (407); In the initial state, the top contact block (402) disposed in the straightening ring (102) presses the trapezoidal bar (403) at the top of the pressing frame (400) inwardly; When the spray frame (103) is driven by the moving mechanism to move to any position of the straightening ring (102), the spray frame (103) pushes the pressing frame (400) to generate an axial offset, so that the trapezoidal bar (403) at the top of the pressing frame (400) gradually breaks away from the pressing action of the top contact block (402).

2. The anti-corrosion coating spraying device for transport pipelines in marine environmental protection projects according to claim 1 is characterized in that: The moving mechanism includes a slide rail (200) connected to the spray bracket (101), a lead screw a (201) is rotatably connected to the slide rail (200), a slider (202) threadedly engaged with the lead screw a (201) is slidably connected to the slide rail (200), the spray frame (103) is connected to the slider (202), and the spray bracket (101) is also connected to a motor a (203), and the drive shaft of the motor a (203) is connected to the lead screw a (201).

3. The anti-corrosion coating spraying device for transport pipelines in marine environmental protection projects according to claim 2 is characterized in that: The spraying mechanism includes a pump a (204) connected to the paint chamber (105), a spraying pipe a (205) connected to the pump a (204), the spraying pipe a (205) being a hard pipe, a spraying chamber (206) being formed in the spraying frame (103), the paint nozzle (104) being connected to the spraying chamber (206), a spraying pipe b (207) being connected to the spraying chamber (206), the spraying pipe b (207) being a hard pipe, and a hose (208) being connected between the spraying pipe a (205) and the spraying pipe b (207).

4. The anti-corrosion coating spraying device for transport pipelines in marine environmental protection projects according to claim 3 is characterized in that: The conveying mechanism includes a driving ring (300) and a stationary ring (301) provided on the spraying bracket (101), which are coaxial with the two straightening rings (102); a plurality of driving wheels (302) are rotatably connected in the driving ring (300); a motor b (303) is connected to the driving ring (300); a driving shaft of the motor b (303) is connected to the driving wheel (302); and a plurality of driven wheels (304) are rotatably connected in the stationary ring (301).

5. The anti-corrosion coating spraying device for transport pipelines in marine environmental protection projects according to claim 4 is characterized in that: The stationary ring (301) is connected to a damping cylinder (305), the shaft of the driven wheel (304) extends into the damping cylinder (305) and is connected to a damping plate (306), a plurality of holes (307) are formed on the damping plate (306), and the damping cylinder (305) is filled with damping grease.

6. The anti-corrosion coating spraying device for transport pipelines in marine environmental protection projects according to claim 4 is characterized in that: A plurality of rollers (410) are rotatably connected to the compression frame (400), a ratchet mechanism (411) is provided between the rollers (410) and the compression frame (400), and a transmission member (412) is provided between the two compression rings (404).

7. The anti-corrosion coating spraying device for transport pipelines in marine environmental protection projects according to claim 6 is characterized in that: Two infrared transmitters (500) are provided on one side of the spraying bracket (101), and two infrared receivers (501) are provided on the other side. The signals emitted by the infrared transmitters are received by the infrared receivers (501). The signal path emitted by the infrared transmitters (500) is in the gap between the pressure ring (404) and the straightening ring (102). The spraying bracket (101) is also provided with a controller (502), which is electrically connected to the motor a (203), the motor b (303), and the pump a (204).

8. The anti-corrosion coating spraying device for transport pipelines in marine environmental protection projects according to claim 1 is characterized in that: A liquid chamber (503) is further provided in the spray box (100), a water curtain chamber (504) and a connecting chamber (505) are provided on the spray bracket (101), a water curtain opening (506) is provided at the bottom of the water curtain chamber (504), a water curtain plate (507) is connected to the water curtain opening (506), a plurality of liquid nozzles (508) are provided on the water curtain chamber (504), a pump b (509) is provided in the liquid chamber (503), a water outlet pipe (510) is connected to the pump b (509), and the water outlet pipe (510) is connected to the connecting chamber (505), a return port (511) is provided at the top of the spray box (100), and the water curtain plate (507) extends into the return port (511).

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