A device for cleaning and anticorrosion spraying of the inner side of a pipe

Abstract

This utility model provides a device for cleaning and applying an anti-corrosion coating to the inner weld joint of a pipe, belonging to the technical field of spraying devices. The utility model includes: a main body with a driving device inside for moving the main body; a telescopic support system including telescopic legs rotatably connected to the main body and rollers on the telescopic legs for moving and supporting the main body inside the pipe; a rotary spraying system mounted on the main body, with a rotary nozzle and nozzles on the rotary nozzle, used for cleaning the weld joint and spraying coating onto it; and a power system for providing the driving force for the rotation of the rotary nozzle. This utility model is particularly suitable for cleaning and spraying the inner weld joint of small-diameter steel pipes. Through the coordinated work of the telescopic support system, the rotary spraying system, and the power system, it can achieve cleaning and anti-corrosion coating of the inner weld joint of small-diameter steel pipes, improving construction quality and work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of spraying device technology, and in particular to a device for cleaning the weld joints on the inside of pipes and spraying an anti-corrosion layer, especially a device suitable for cleaning the weld joints on the inside of small-diameter steel pipes and spraying an anti-corrosion layer. Background Technology

[0002] In the construction of small-diameter steel pipes such as sewage pipes and heating pipes, when pipe connections are made by welding, the confined space inside the weld joints makes it difficult for workers to access them for cleaning and coating after welding. In conventional construction, these welds are typically only treated with external anti-corrosion measures, leaving the internal welds untreated, posing a potential quality hazard. Therefore, developing a device for cleaning and coating the internal welds of pipes is of significant engineering importance, especially for small-diameter steel pipes. Utility Model Content

[0003] In view of this, in order to solve the technical problem that the inner weld joints cannot be cleaned and sprayed due to the narrow internal space of the pipe in the existing technology, this utility model provides a device for cleaning the inner weld joints and spraying the anti-corrosion layer, which is particularly suitable for cleaning and spraying the inner weld joints of small-diameter steel pipes. Through the coordinated work of the telescopic support system, the rotary spraying system and the power system, it can realize the cleaning of the inner weld joints and the spraying of the anti-corrosion layer on small-diameter steel pipes, thereby improving the construction quality and work efficiency.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An apparatus for cleaning the weld joints on the inside of a pipe and spraying an anti-corrosion coating, comprising:

[0006] The main body has a drive device inside it for driving the main body to move;

[0007] The telescopic support system includes telescopic legs rotatably connected to the main body and rollers mounted on the telescopic legs, for the main body to move and be supported inside the tube;

[0008] A rotary spraying system is mounted on the main body, which is equipped with a rotary spray head and a nozzle mounted on the rotary spray head. The rotary spraying system is used for cleaning weld joints and spraying coating onto weld joints.

[0009] A power system is used to provide the rotational driving force for the rotary nozzle.

[0010] Preferably, the driving device includes:

[0011] A driver for driving the roller to rotate;

[0012] A battery is used to provide power to the drive.

[0013] Preferably, it also includes a braking mechanism.

[0014] Preferably, the telescopic support system further includes:

[0015] A spring bracket, with one end connected to the main body and the other end connected to the end of the telescopic leg away from the main body, is used to adaptively compensate for the angle at which the telescopic leg is extended.

[0016] Preferably, the power system includes:

[0017] An air compressor provides driving force to the rotary nozzle through a first high-pressure hose;

[0018] The compressed air generated by the air compressor drives the coating material through the second high-pressure hose to the nozzle for spraying the weld joint.

[0019] Preferably, the air compressor is equipped with a pressure gauge.

[0020] Preferably, the tail end of the body is further provided with a measuring rope for determining the post-weld position.

[0021] The device for cleaning and spraying anti-corrosion coating on the inner side of pipes provided by this utility model is particularly suitable for cleaning and spraying the inner side welds of small-diameter steel pipes. Through the coordinated work of the telescopic support system, the rotary spraying system and the power system, it can achieve the cleaning and anti-corrosion coating of the inner side welds of small-diameter steel pipes. Compared with the prior art, it has the following advantages:

[0022] (1) Compact design to fit small-diameter pipes, breaking through space limitations

[0023] Core advantages: Through the modular integrated telescopic support system (spring support + telescopic legs), it can smoothly enter small-diameter steel pipes, solving the problem that traditional equipment cannot enter small-diameter pipes due to its large size.

[0024] Structural support: The adaptive compensation function of the spring bracket, combined with the differential steering design of the roller, enables the device to move flexibly in curved pipes.

[0025] (2) Integrated cleaning and spraying operation improves construction efficiency.

[0026] Process optimization: The integrated weld cleaning mechanism (such as compressed air spraying high-pressure gas through the nozzle of a rotating nozzle) and the rotary spraying system can complete the entire process of "weld rust removal and cleaning → anti-corrosion coating spraying" in a single pipeline entry. Compared with the traditional "manual cleaning + multiple spraying" mode, the construction efficiency is greatly improved.

[0027] Automated control: The power system can also be equipped with PID closed-loop control, which works in conjunction with the measuring rope positioning to achieve precise docking of the device at the weld joint, avoiding repeated manual adjustments and reducing ineffective work time.

[0028] (3) Improved uniformity and durability of anti-corrosion coating

[0029] Advantages of spraying technology: The rotating spray head, combined with the air compressor drive, delivers the coating without a pump, atomizing the paint and greatly reducing errors in coating thickness uniformity compared to traditional manual spraying.

[0030] (4) Reduce reliance on manual labor and operational risks

[0031] Unmanned operation: The device is remotely controlled via an external measuring rope and a PID closed-loop controller, eliminating the need for construction personnel to enter narrow pipes and improving operational safety.

[0032] In summary, this utility model achieves "miniaturization, automation, and integration" of the inner weld joint treatment of small-diameter steel pipes through structural innovation, solving the core pain points of existing technologies in terms of spatial adaptability, operational efficiency, and coating quality. It is particularly suitable for small-diameter pipeline projects such as municipal gas and water supply and drainage, and has significant engineering application value. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0034] Figure 2 This is a schematic diagram of the present invention applied to the inner side of a small-diameter rigid pipe;

[0035] In the diagram, 1. Roller; 2. Spring bracket; 3. Nozzle; 4. Rotating nozzle; 5. Telescopic outrigger; 6. Drive unit; 7. First high-pressure hose; 8. Second high-pressure hose; 9. Air compressor; 10. Pressure gauge. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0037] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] like Figure 1-2 As shown, this utility model provides a device for cleaning the weld joint on the inside of a pipe and spraying an anti-corrosion coating, comprising:

[0040] The main body contains a drive unit 6 for moving the main body. Preferably, the main body adopts a cylindrical modular structure, with an overall slender cylindrical shape. The outer shell is preferably made of high-strength aluminum alloy, and the surface is preferably anodized, combining lightweight and corrosion resistance. The outer shell preferably adopts an IP67-level sealing design, achieving waterproof and dustproof protection through O-rings and quick-release end caps, adapting to humid and dusty environments inside pipelines (such as municipal drainage pipes). As the integrated carrier and control center of the entire device, its functions include:

[0041] Module integration: The internal partition design accommodates the power system, transmission mechanism and control module; the external circumferentially evenly distributed telescopic support system (preferably 4 sets), the front end has a pre-installed connecting flange for the aforementioned rotary spraying system, and the rear end integrates the measuring rope fixing seat and cable interface, etc.

[0042] Key role

[0043] Structural support: Provides rigid support for external components such as the telescopic support system and the rotary spraying system, ensuring that the main body does not deform when the spring support 2 is extended, and maintaining overall stability.

[0044] Space adaptability: The slender cylindrical design, combined with the telescopic support system, allows the device to pass smoothly through narrow areas such as pipe welds and bends, solving the problem that traditional equipment cannot enter small-diameter pipes due to its large size.

[0045] In summary, the main body, through its compact and modular cylindrical design, achieves integrated power, control, and structural support, serving as the core carrier to ensure that the equipment can efficiently complete cleaning and spraying operations within a small-diameter steel pipe.

[0046] The telescopic support system includes telescopic legs 5 rotatably connected to the main body and rollers 1 mounted on the telescopic legs 5, used for the main body to move and support itself within the tube. Preferably, the telescopic legs 5 are located on the outer side of the main body and rotatably connected to it to adapt to angle adjustment; they are preferably evenly distributed circumferentially, and the number is preferably four sets. The rollers 1 are preferably rubber rollers.

[0047] A rotary spraying system is mounted on the main body, and a rotary spray head 4 and nozzles 3 mounted on the rotary spray head 4 are provided thereon. The rotary spraying system is used for cleaning the weld joint and spraying coating onto the weld joint. Preferably, the rotary spraying system is located at the front end of the main body.

[0048] A power system is used to provide rotational driving force for the rotary nozzle 4.

[0049] In this utility model, the driving device 6 includes:

[0050] A driver is used to drive the roller 1 to rotate.

[0051] A battery is used to provide power to the drive.

[0052] The functions of drive unit 6 are as follows:

[0053] Movement and braking: The battery and driver provide power to drive the roller 1 to move the body inside the pipe; the integrated braking module can precisely park at the weld joint.

[0054] Weld joint positioning: Preferably, the distance from the pipe outlet to the weld joint is measured in advance, and the position is marked on the outside of the pipe using the measuring rope at the tail of the device to achieve precise positioning of the weld joint. Alternatively, a positioning system known in the art can be selected for precise positioning of the weld joint, unless there are special requirements.

[0055] It has the following advantages:

[0056] No personnel required: Solves the problem of internal operations in small-diameter pipelines (where personnel cannot enter), avoiding the risks of manual operation.

[0057] Precise positioning: Combining the measuring rope and drive control, the device is ensured to stay directly in front of the weld joint, providing positional assurance for subsequent cleaning and spraying.

[0058] The drive device 6 can be any conventional drive device in the field, which can drive the main body to walk and brake. There are no special requirements for it, and it can be selected according to actual needs.

[0059] This utility model provides a specific embodiment of the driving device 6, which may specifically include:

[0060] The battery unit, such as a high-capacity lithium-ion battery pack, features high energy density and low-temperature discharge performance, making it suitable for the low-temperature outdoor environments of municipal engineering projects. The battery pack is encapsulated in an aluminum alloy casing with epoxy resin, and the casing surface is designed with heat dissipation fins to reduce temperature rise during long-term operation. It is located at the rear of the device and secured with shock-absorbing rubber pads to prevent poor battery contact caused by vibrations within the pipeline.

[0061] The driver includes a drive motor, such as a brushless DC motor (BLDC), which outputs torque through a planetary gear reducer to drive roller 1 to rotate. Quantity: 2 units, each driving roller 1 on one side of the main body to form differential steering. Hall sensors are integrated at the motor shaft end to achieve closed-loop speed control.

[0062] Motor controller: Uses STM32F407 microcontroller, supports PWM speed regulation and PID algorithm to control motor speed and direction.

[0063] Interface module: includes CAN bus interface, motor drive interface and brake control interface.

[0064] The braking mechanism, such as an electromagnetic brake, is installed on the output shaft of the drive motor. When power is off, the spring drives the brake pads to grip the brake disc, ensuring the device remains stable at the weld joint. Located in the middle section of the main body, it connects to the battery unit via an aviation connector (IP67 protection rating). The motor controller housing is made of ABS engineering plastic, providing dust and water resistance (suitable for humid environments inside pipelines).

[0065] This invention also includes a braking mechanism.

[0066] In this utility model, the telescopic support system further includes:

[0067] The spring bracket 2, with one end connected to the main body and the other end connected to the end of the telescopic leg 5 furthest from the main body, is used to adaptively compensate for the opening angle of the telescopic leg 5. The spring bracket 2 is preferably connected to the end of the telescopic leg 5 closest to the main body (the fixed end). It has the following functions:

[0068] Pipe diameter adaptation: The telescopic support leg 5, in conjunction with the spring bracket 2, adaptively expands through the spring force, allowing the roller 1 to fit tightly against the inner wall of the pipe, thus fixing the device in position within the pipe. The telescopic support leg 5, with one end of the roller 1 (the telescopic end), can be adjusted in length (preferably by adjusting the telescopic length via a telescopic rod) in conjunction with the spring bracket 2 to accommodate small-diameter steel pipes with different inner diameters.

[0069] Walking assistance: Rollers 1 reduce friction between the device and the pipe wall during movement, making it easier for the drive unit 6 of the power system to drive the body to move inside the pipe.

[0070] Telescopic support systems have the following advantages:

[0071] Strong adaptability: The spring bracket 2 automatically compensates for pipe diameter errors and can adapt to standard or non-standard pipe diameters without manual adjustment.

[0072] High stability: Multiple sets of rollers are evenly distributed to prevent the device from tilting or getting stuck in the pipe, ensuring positioning accuracy during cleaning and spraying.

[0073] In this utility model, the power system includes:

[0074] Air compressor 9 provides driving force to the rotary nozzle 4 through the first high-pressure hose 7;

[0075] The compressed air generated by the air compressor 9 drives the coating material to be delivered to the nozzle 3 through the second high-pressure hose 8 for spraying the weld joint.

[0076] In this invention, air compressor 9 generates compressed air, which drives the weld cleaning and rotating nozzle 4 to rotate via the first high-pressure hose 7. The anti-corrosion material is pressurized and delivered to the rotating nozzle 4 via the second high-pressure hose 8, ensuring material atomization and adhesion strength. Pressure gauge 10 displays the delivery pressure of compressed air and anti-corrosion material in real time, allowing operators to adjust parameters to adapt to different working conditions.

[0077] In this invention, the process of delivering the coating to the nozzle 3 is as follows:

[0078] The anti-corrosion coating is delivered to nozzle 3 via a compressed air system and a dedicated high-pressure hose. The specific path is as follows:

[0079] Coating storage and initial delivery: Anti-corrosion coatings (such as epoxy coal tar pitch, polyurea, etc.) are pre-stored in coating storage tanks outside the pipeline. The outlet of the storage tank is connected to the second high-pressure hose 8 (dedicated pipeline for anti-corrosion materials) of the air compressor 9 through a valve.

[0080] Power is provided by the air compressor 9: The external air compressor 9 generates compressed air. After the weld joint is cleaned, the operator opens the anti-corrosion coating delivery valve, and the compressed air enters the top of the coating storage tank. The coating is then forced from the storage tank into the second high-pressure hose 8 by the air pressure difference.

[0081] The second high-pressure hose 8 delivers the coating material, which is propelled by compressed air, from the outside of the pipe to the internal flow channel of the rotating nozzle 4 at the front end of the main body through the second high-pressure hose 8 (made of corrosion-resistant rubber).

[0082] Atomized spraying from nozzle 3: After the coating enters the rotating nozzle 4, it is evenly sprayed onto the inner surface of the weld joint through the nozzle 3 at the front end under the action of centrifugal force (generated by the 360° rotation of the rotating nozzle 4) and secondary atomization by compressed air, forming a continuous anti-corrosion coating.

[0083] This invention utilizes compressed air as a power source to achieve pump-free delivery of coatings, avoiding the installation limitations of mechanical pumps in small-diameter pipes. At the same time, the flexibility of the high-pressure hose adapts to the movement requirements of the device within the pipeline.

[0084] The power system configuration in this invention has the following advantages:

[0085] Controllable pressure: By adjusting the output pressure of the air compressor 9, it can adapt to the cleaning needs of weld joints of pipes of different materials (such as stainless steel pipes, which need to reduce pressure to avoid damage to the inner wall).

[0086] High material utilization rate: High-pressure atomization spraying reduces the waste of anti-corrosion materials and saves materials compared to manual brushing.

[0087] In this invention, a pressure gauge 10 is installed on the air compressor 9 to monitor the paint delivery pressure in real time, ensuring spraying stability. Through the reading of the pressure gauge 10, the operator can intuitively grasp the real-time pressure of the compressed air driving the paint, ensuring a stable flow rate of the paint within the high-pressure hose and avoiding uneven atomization particle size or coating thickness deviation due to pressure fluctuations. When impurities are present in the paint or the hose is bent, causing increased pipeline resistance, the pressure gauge 10 reading will rise abnormally, triggering the automatic shutdown protection in the air compressor 9 to prevent the high-pressure hose from bursting or the rotating nozzle 4 from becoming clogged, thus reducing the equipment failure rate.

[0088] In summary, pressure gauge 10, as the core component for pressure monitoring and feedback, enables precise control of paint delivery through real-time data visualization.

[0089] In this invention, the tail end of the main body is also equipped with a measuring rope for positioning after welding. One end of the measuring rope is fixed to the connector at the tail end of the main body by a buckle or threaded structure, and the other end extends to the outside of the pipe, with a length scale mark at the end. The measuring rope hangs naturally inside the pipe and unfolds synchronously with the device as it moves inside the pipe, without interfering with other components such as the support system and the spraying system. By pre-measuring the distance from the pipe outlet to the weld joint, the operator can pull the measuring rope to the corresponding scale outside the pipe to guide the device to accurately stop at the weld joint position, achieving coordinated control of "external marking - internal positioning".

[0090] The above description is merely a preferred embodiment of this utility model. However, the scope of protection of this utility model is not limited thereto; any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the scope of protection of this utility model.

Claims

1. A device for cleaning and coating the inner side of a pipe weld, characterized in that include: The main body has a drive device inside it for driving the main body to move; The telescopic support system includes telescopic legs rotatably connected to the main body and rollers mounted on the telescopic legs, for the main body to move and be supported inside the tube; A rotary spraying system is mounted on the main body, which is equipped with a rotary spray head and a nozzle mounted on the rotary spray head. The rotary spraying system is used for cleaning weld joints and spraying coating onto weld joints. A power system is used to provide the rotational driving force for the rotary nozzle.

2. A device for cleaning and coating the inner weld of a pipe according to claim 1, characterized in that The driving device includes: A driver for driving the roller to rotate; A battery is used to provide power to the drive.

3. A device for cleaning and coating the inner weld of a pipe according to claim 2, characterized in that It also includes the braking mechanism.

4. A device for cleaning and coating the inner side of a pipe according to claim 1, characterized in that, The telescopic support system also includes: A spring bracket, with one end connected to the main body and the other end connected to the end of the telescopic leg away from the main body, is used to adaptively compensate for the angle at which the telescopic leg is extended.

5. A device for cleaning and coating the inner side of a pipe weld according to claim 1, characterized in that The power system includes: An air compressor provides driving force to the rotary nozzle through a first high-pressure hose; The compressed air generated by the air compressor drives the coating material through the second high-pressure hose to the nozzle for spraying the weld joint.

6. A device for cleaning and coating the inner weld of a pipe according to claim 5, characterized in that The air compressor is equipped with a pressure gauge.

7. A device for cleaning and coating the inside of a pipe weld according to any one of claims 1-6, characterized in that The tail end of the main body is also provided with a measuring rope for determining the position of the weld joint.

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