Apparatus and method for painting the inner wall of slender conduit-like parts

Abstract

This application provides an apparatus and method for painting the inner wall of a slender conduit-like part. The apparatus includes: a part clamping system for clamping both ends of the slender conduit-like part; a paint mixing and conveying system for automatically mixing paint and automatically conveying the mixed paint to an automated painting and paint circulation system; an automated painting and paint circulation system connected to the paint mixing and conveying system and the part clamping system; the automated painting and paint circulation system for painting the inner wall of the slender conduit-like part and circulating the paint; and a waste gas collection and treatment system connected to the automated painting and paint circulation system for collecting and treating waste gas generated during the painting process.

Description

Technical Field

[0001] This application belongs to the technical field of inner wall painting in the manufacturing process of aircraft slender duct parts, specifically relating to an inner wall painting device and method for slender duct parts. Background Technology

[0002] In aircraft design and manufacturing, slender tubular parts made of metal or composite materials are widely used. In order to achieve functions such as lubrication, heat resistance or corrosion protection on the inner wall, some slender tubular parts often require the inner wall to be coated with some functional paint. Such parts generally have a small inner diameter (inner diameter: 20mm to 100mm) and a long tube length, generally 2m to 4m.

[0003] In traditional painting processes, one method is spraying, which involves using a spray gun to atomize paint and apply it to the surface of a part under pressure. This process can only be carried out on exposed, accessible surfaces. Because the paint is atomized and dispersed in the air during the spraying process, a large amount of paint evaporates, and only a small amount reaches the surface of the part to achieve coating, resulting in a great waste of paint. Furthermore, this spraying process is limited by the shape of the part and the size of the spraying equipment, making it impossible for the spray nozzle to enter the interior of slender, duct-like parts, thus preventing the painting of the inner walls of such parts.

[0004] Another process is dip coating, which involves filling a tank or trough with paint and immersing the parts below the paint surface, allowing a layer of paint to adhere to the surface of the parts. However, due to the relatively long length of the conduit, the gas pressure inside the conduit can hinder the entry of paint, thus traditional dip coating processes cannot coat the inner walls of slender conduit-like parts.

[0005] To meet the design requirements of aircraft parts and achieve internal wall painting of slender duct-like components while reducing paint waste and air pollution, a suitable internal wall painting device for such components needs to be developed. This device should be easy to operate, highly automated, and integrate pollutant collection and treatment. A method should also be provided to meet the painting requirements of these components, thus solving the problem that traditional spray painting processes cannot effectively paint the internal walls of slender duct-like components. Summary of the Invention

[0006] Purpose of the invention: To provide a universal conduit component inner wall painting device that is easy to operate, highly automated, and integrates pollutant collection and treatment, as well as a method for painting the inner walls of various conduit components.

[0007] In a first aspect, this application provides an apparatus for painting the inner wall of an elongated conduit-like component, the apparatus comprising:

[0008] A parts clamping system for holding both ends of slender, tubular parts;

[0009] The paint mixing and conveying system is used to automatically mix paint and automatically convey the mixed paint to the automated painting and paint circulation system.

[0010] An automated painting and paint circulation system is connected to the paint mixing and conveying system and the parts clamping system; the automated painting and paint circulation system is used to paint the inner wall of the slender conduit-like parts and circulate the paint.

[0011] An exhaust gas collection and treatment system is connected to the automated painting and paint recycling system. The exhaust gas collection and treatment system is used to collect exhaust gas during the painting process and treat the exhaust gas.

[0012] Preferably, the parts clamping system includes:

[0013] cylindrical body;

[0014] A lower circular fixed clamping mechanism is provided in the lower part of the cylinder body. The lower circular fixed clamping mechanism is used to fix the lower end of slender conduit-like parts.

[0015] An upper circular movable clamping mechanism is disposed in the upper part of the cylinder body. The upper circular movable clamping mechanism is used to fix the upper end of slender conduit-like parts.

[0016] Preferably, the lower circular fixed clamping mechanism is the same as the upper circular movable clamping mechanism.

[0017] Preferably, the lower circular fixed clamping mechanism includes:

[0018] A flat plate is disposed in the lower part of the cylinder;

[0019] Small round holes are provided on the plate;

[0020] A rubber ring is installed inside the small round hole to form a clamping hole; the clamping hole is used to fix the lower end of the slender conduit-like part.

[0021] A paint flow hole is provided on the flat plate, and the paint flow hole is connected to the small round hole;

[0022] The inner diameter of the small circular hole is larger than the inner diameter of the paint flow hole, and the inner diameter of the slender conduit-like part is equal to the inner diameter of the paint flow hole.

[0023] Preferably, the lower circular fixed clamping mechanism further includes:

[0024] A lower inclined plate is inclinedly disposed in the lower part of the cylinder body, the lower inclined plate is located below the flat plate, and a cavity is formed between the lower inclined plate and the flat plate.

[0025] Preferably, the cylindrical body comprises:

[0026] The top cover has an air inlet and an air outlet; wherein the exhaust gas collection and treatment system is connected to the air outlet.

[0027] Preferably, the cylindrical body further includes:

[0028] A paint inlet is located at the lower part of the side wall of the cylinder; wherein, paint enters the cavity through the paint inlet;

[0029] A paint drain port is located at the lower part of the side wall of the cylinder; wherein the paint in the cavity flows out through the paint drain port;

[0030] A paint return port is located on the upper part of the side wall of the cylinder; wherein the paint inside the cylinder is returned through the paint return port.

[0031] Secondly, this application also provides a method for painting the inner wall of a slender conduit-like part, the method comprising:

[0032] Turn on the air valve, exhaust gas treatment device, and exhaust fan;

[0033] Turn on the paint mixer;

[0034] Start the base material circulation pump, diluent circulation pump, and curing agent circulation pump to automatically transport the base material, diluent, and curing agent from the base material cylinder, diluent cylinder, and curing agent cylinder to the paint mixing cylinder according to the required proportions. The three components of base material, diluent, and curing agent are fully mixed under the action of the paint agitator to prepare the paint used in production.

[0035] Open the paint backflow control valve;

[0036] Turn on the paint delivery pump, and the prepared paint is delivered from the paint mixing cylinder to the lower cavity of the cylinder. As the delivery time increases, the paint level rises continuously, filling the lower cavity of the cylinder. The paint flows through the lower circular fixed clamping mechanism's lower paint flow hole, the inside of the guide tube, and the upper circular movable clamping mechanism's upper paint flow hole channel. Under pressure, the paint reaches the upper cavity of the cylinder. When the paint level reaches the paint drain port in the upper cavity, the paint flows back to the paint mixing cylinder automatically through the paint return control valve, forming a paint circulation channel. During this process, the pressure of the paint on the inner wall of the guide tube causes the paint to deposit on the inner wall of the guide tube, completing the painting work on the inner wall of the guide tube.

[0037] Preferably, before opening the air valve, the waste gas treatment device, and the exhaust fan, the following steps are also included:

[0038] Remove the upper circular movable clamping mechanism;

[0039] Insert one end of the slender conduit-like part into the clamping hole with the rubber ring of the lower circular fixed clamping mechanism, and make all parts vertical.

[0040] Insert one end of the slender conduit-like part into the clamping hole with the rubber ring of the lower circular fixed clamping mechanism. Adjust the state of the part and the upper circular movable clamping mechanism so that the other end of the part is inserted into the clamping hole with the rubber ring of the upper circular movable clamping mechanism. Press the upper circular movable clamping mechanism to make it tightly connected with the circular ribs in the upper part of the cylinder to achieve a sealing effect and complete the part clamping work.

[0041] Preferably, the method further includes:

[0042] After the spraying time is reached, open the paint drain valve and close the paint return control valve to allow the paint to flow back to the paint mixing cylinder through the paint drain pipe at the bottom of the cylinder, thus completing the paint recycling process.

[0043] The exhaust fan is kept running throughout the painting process to accelerate the drying and curing speed of the parts and complete the drying and curing of the painted parts.

[0044] Lift and remove the upper circular movable clamping mechanism;

[0045] Remove the part from the circular movable clamping mechanism and hand it over for inspection.

[0046] This application has the following technical advantages:

[0047] This integrated device combines automatic paint mixing, parts painting, and waste gas collection and treatment, integrating the functions of three traditionally separate systems, significantly reducing equipment investment costs and minimizing floor space required. By pressurizing the paint supply pump and circulating the paint within the conduit components, it achieves the internal painting process for slender conduit parts, perfectly solving the painting challenges inherent in traditional equipment. It achieves automated and precise paint mixing using a hardener, base material, and thinner circulation system, effectively preventing the deposition and failure of hardener, base material, and thinner. The high accuracy and precision of paint mixing reduces the frequency of pipeline cleaning and paint waste, thereby reducing pollutant emissions and achieving green production. It enables paint recycling; after multiple cycles, almost all paint is ultimately used for coating the inner walls of conduit components. Compared to traditional spray painting processes, paint utilization is increased several times, significantly reducing paint waste, lowering costs, and reducing pollutant emissions. It also achieves precise collection and treatment of waste gas throughout the entire production process, meeting environmental emission requirements. Furthermore, it complies with national green manufacturing and clean production requirements, ensuring the quality of component coating and possessing broad versatility. Attached Figure Description

[0048] Figure 1 Typical part diagram with painted inner wall;

[0049] Figure 2 Schematic diagram of an automated device for painting the inner wall of slender conduit-like parts;

[0050] Figure 3 Diagram showing the paint finish on the inner wall of a slender, tubular component;

[0051] Figure 4 Diagram of an automated device for coating the inner wall of slender conduit-like parts, including a parts clamping system.

[0052] Figure 5 Diagram of paint mixing and circulation in an integrated automatic device for painting the inner wall of slender conduit-like parts;

[0053] Figure 6 Diagram of an automated device integrating inner wall painting for slender conduit-like parts, showing waste gas collection and treatment.

[0054] Figure 7 Structural diagram of the lower circular fixed clamping mechanism;

[0055] The components are: 1-Equipment support platform, 2-Cylinder body, 3-Cylinder body lower inclined plate, 4-Lower circular fixed clamping mechanism, 5-Lower paint flow hole, 6-Paint drain valve, 7-Paint agitator, 8-Paint mixing cylinder, 9-Base material conveying control valve, 10-Base material cylinder, 11-Diluent conveying control valve, 12-Diluent cylinder, 13-Cure agent conveying control valve, 14-Cure agent cylinder, 15-Cure agent circulating conveying pump, 16-Cure agent flow meter. 17-Diluent circulation pump, 18-Diluent flow meter, 19-Base material circulation pump, 20-Base material flow meter, 21-Paint delivery pump, 22-Paint control valve, 23-Paint return control valve, 24-Air inlet, 25-Air collector hood, 26-Upper circular movable clamping mechanism, 27-Rubber ring, 28-Typical parts, 29-Air valve, 30-Exhaust duct, 31-Waste gas treatment device, 32-Exhaust fan, 33-Small round hole. Detailed Implementation

[0056] This application solves the problem of being unable to paint the inner wall of slender conduit parts due to their small orifice diameter; it provides an apparatus and method for automated painting of the inner wall of slender conduit parts; it changes the traditional single-part painting process, enabling batch production of multiple parts and improving painting efficiency; it provides an apparatus and method for automated paint mixing based on demand, reducing paint waste and achieving the circulation of base material, hardener, and thinner, avoiding short-term failure of these components; it provides an automated paint stirring device, avoiding paint failure due to paint deposition; and it overcomes the problem of unorganized emission and inability to collect and treat exhaust gas from traditional solution-based paint removal.

[0057] An integrated automatic device for painting the inner wall of slender conduit-like parts is provided. This device mainly consists of a parts clamping system, a paint mixing and conveying system, an automated painting and paint circulation system, and a waste gas collection and treatment system. Its main components include: an equipment support platform 1, a cylinder 2, a lower inclined plate of the cylinder 3, a lower circular fixed clamping mechanism 4, a lower paint flow hole 5, a paint venting valve 6, a paint agitator 7, a paint mixing cylinder 8, a base material conveying control valve 9, a base material cylinder 10, a thinner conveying control valve 11, and a thinner cylinder 12. 2. Components including: 13. Curing agent delivery control valve; 14. Curing agent cylinder; 15. Curing agent circulation pump; 16. Curing agent flow meter; 17. Diluent circulation pump; 18. Diluent flow meter; 19. Base material circulation pump; 20. Base material flow meter; 21. Paint delivery pump; 22. Paint control valve; 23. Paint return control valve; 24. Air inlet; 25. Air collector hood; 26. Upper circular movable clamping mechanism; 27. Rubber ring; 28. Typical parts; 29. ​​Air valve; 30. Exhaust duct; 31. Waste gas treatment device; 32. Exhaust fan; etc.

[0058] The parts clamping system is mainly used for fixing and clamping parts to be painted. One end of a slender, tubular part is inserted into the clamping hole with a rubber ring in the lower circular fixed clamping mechanism. The upper circular movable clamping mechanism is adjusted so that the other end of the part is inserted into the clamping hole with a rubber ring in the upper circular movable clamping mechanism and pressed firmly, forming a complete paint flow path through the lower paint flow hole, the tubular part, and the upper paint flow hole. The paint mixing and conveying system is mainly used for the automated mixing and conveying of paint. The base material, hardener, and thinner are pumped into the paint mixing cylinder according to the paint mixing ratio requirements. After being thoroughly mixed by the paint agitator, the paint is prepared for application. The automated painting and paint circulation system primarily handles the painting of the inner walls of parts and the recycling of paint. Prepared paint is transported to the lower cavity of the paint cylinder via a paint delivery pump and pipeline. As the volume of paint increases, it flows back to the paint cylinder along the lower paint flow hole, the inner wall of the slender guide tube, the upper paint flow hole, and the upper paint return pipe, completing the paint circulation. During this process, the pressure created by the paint against the inner wall of the guide tube components ensures that the inner wall of the guide tube components is painted. The waste gas collection and treatment system is mainly used to collect and purify the waste gas generated during the painting process, achieving compliant emissions and accelerating the curing of the paint layer. Meanwhile, the paint mixing and conveying system needs to be connected to the automated painting and paint circulation system to provide the device with usable paint and to make the paint flow into a circulation system; the automated painting and paint circulation system needs to be connected to the parts clamping system so that the paint flows through the inside of the clamped conduit parts, thereby achieving paint coating on the inner wall of the parts; the automated painting and paint circulation system is connected to the waste gas collection and treatment system to collect and treat the waste gas generated in the painting process in a centralized manner to achieve emission standards.

[0059] The parts clamping system includes: an equipment support platform 1, a cylinder 2, a lower inclined plate 3, a lower circular fixed clamping mechanism 4, a lower paint flow hole 5, an upper circular movable clamping mechanism 26, and rubber rings 27. The equipment support platform 1 is mainly used to place the cylinder 2. The lower inclined plate 3 is welded to the lower layer of the cylinder 2 towards the paint discharge side, ensuring its sealing. The lower circular fixed clamping mechanism 4 is welded to the lower half of the cylinder 2, ensuring its sealing, so that the lower inclined plate 3, the cylinder 2, and the lower circular fixed clamping mechanism 4 form a cavity. A small internal cavity is provided within the lower circular fixed clamping mechanism 4. Rubber ring 27 is pressed into the round hole. One end of typical part 28 is inserted into the clamping hole with rubber ring of the lower circular fixed clamping mechanism, so that the lower metal part of the four small round holes of the lower circular fixed clamping mechanism is approximately consistent with the diameter of the guide tube hole, forming a paint flow passage. Rubber ring is pressed into the small round hole inside the upper circular movable clamping mechanism 26, and a sealing ring is fitted on the outer circumference. The other end of typical part 28 is inserted into the clamping hole with rubber ring of the upper circular movable clamping mechanism, and the state is adjusted and pressed to make it tightly combined with the circular ribs in the upper part of the cylinder to achieve a sealing effect and form a paint flow passage.

[0060] The paint mixing and conveying system includes: a paint mixer 7, a paint mixing cylinder 8, a base material conveying control valve 9, a base material cylinder 10, a thinner conveying control valve 11, a thinner cylinder 12, a hardener conveying control valve 13, a hardener cylinder 14, a hardener circulating conveying pump 15, a hardener flow meter 16, a thinner circulating conveying pump 17, a thinner flow meter 18, a base material circulating conveying pump 19, and a base material flow meter 20. The paint mixing cylinder 8 is installed, and the paint mixer 7 is installed inside the paint mixing cylinder. The base material in the base material cylinder 10 is conveyed through pipelines using the base material flow meter 20 and the base material conveying control valve 9, via a base material circulating conveying system. Pump 19 delivers the base material to the paint mixing cylinder 8 according to the required proportion; the thinner cylinder 12, through a pipeline in conjunction with the thinner flow meter 18 and the thinner delivery control valve 11, uses the thinner circulation pump 17 to deliver the thinner to the paint mixing cylinder 8 according to the required proportion; the hardener cylinder 14, through a pipeline in conjunction with the hardener flow meter 16 and the hardener delivery control valve 13, uses the hardener circulation pump 15 to deliver the hardener to the paint mixing cylinder 8 according to the required proportion; the base material, thinner, and hardener are fully mixed under the action of the paint agitator 7 to prepare the paint used in production.

[0061] The automated painting and paint circulation system includes: a paint drain valve 6, a paint delivery pump 21, a paint control valve 22, a paint return control valve 23, and an air inlet 24. The prepared paint is delivered from the paint mixing cylinder 8 to the lower cavity of the cylinder via the paint delivery pump 21. As the delivery time increases, the paint level rises, filling the lower cavity of the cylinder. Through the lower circular fixed clamping mechanism's lower paint flow hole, the inside of the guide tube, and the upper circular movable clamping mechanism 26's upper paint flow hole channel, pressure forces the paint to the upper cavity of the cylinder. When the paint level reaches the paint drain port in the upper cavity, the paint automatically flows back to the paint mixing cylinder along the pipe, forming a paint circulation channel. During this process, the pressure of the paint on the inner wall of the guide tube causes the paint to deposit on the inner wall, completing the painting process on the inner wall of the guide tube. After painting is completed, turn off the paint delivery pump 21 to stop paint delivery; open the paint vent valve 6 and close the paint return control valve 23 to allow the paint to flow back to the paint mixing drum along the paint vent pipe at the bottom of the drum, completing the paint recycling process. This process reduces paint volatilization in the air, reduces paint usage, and reduces pollutant emissions.

[0062] The exhaust gas collection and treatment system includes: a collection hood 25, a damper 29, an exhaust duct 30, an exhaust gas treatment device 31, and an exhaust fan 32. During the painting process, exhaust gas is collected through the collection hood 25 installed on the top of the duct. The collection hood 25 is connected to the damper 29 and the exhaust fan 32 through an exhaust pipe, which accelerates the gas flow of the system and speeds up the curing and drying of the paint layer. Under the action of the exhaust fan 32, the collected exhaust gas is pumped to the exhaust gas treatment device 31 for exhaust gas treatment, and the treated exhaust gas meets the emission standards.

[0063] First, a steel equipment support platform 1 needs to be manufactured. A steel cylinder 2 is installed on the equipment support platform 1. A lower inclined plate 3 is welded to the lower part of the cylinder 2 on the side where the paint is discharged, ensuring its airtightness. A lower circular fixed clamping mechanism 4 is welded to the lower half of the cylinder 2, ensuring its airtightness, so that the lower inclined plate 3, the cylinder 2, and the lower circular fixed clamping mechanism 4 form a cavity. The inner small circles of the upper circular movable clamping mechanism 26 are connected to the circular ribs in the upper part of the cylinder. The rubber ring is pressed into the hole, and the sealing ring is tightly fitted around the outer circumference. One end of the slender conduit-like part is inserted into the clamping hole with the rubber ring in the lower circular fixed clamping mechanism. The state of the part and the upper circular movable clamping mechanism 26 is adjusted so that the other end of the part is inserted into the clamping hole with the rubber ring in the upper circular movable clamping mechanism. The upper circular movable clamping mechanism 26 is pressed tightly so that it is tightly combined with the circular rib in the upper part of the cylinder to achieve a sealing effect, complete the part clamping work, and form a paint flow channel.

[0064] Next, a paint mixing tank 8 needs to be set up as a container for paint mixing and storage. A paint agitator 7 is installed on the upper part of the paint mixing tank, with the agitator blades positioned inside the mixing tank to achieve paint mixing, for mixing the paint and allowing it to stand and cure. Simultaneously, to provide the paint mixing tank with base material, thinner, and hardener, a base material tank 10, a thinner tank 12, and a hardener tank 14 are set up, along with a base material circulation pump 19, a thinner circulation pump 17, a hardener circulation pump 15, and corresponding flow meters and pipelines. The base material circulation pump 19 delivers the base material to the paint mixing cylinder according to the required mixing ratio; the thinner in the thinner cylinder 12 is delivered to the paint mixing cylinder according to the required mixing ratio through a pipeline in conjunction with a metering pump using the thinner circulation pump 17; the hardener in the hardener cylinder 14 is delivered to the paint mixing cylinder according to the required mixing ratio through a pipeline in conjunction with a metering pump using the hardener circulation pump 15; the base material, thinner, and hardener are fully mixed under the action of the paint agitator 7 to prepare the paint used in production. A pipe and paint delivery pump 21 are installed in the lower part of the lower cavity of cylinder 2, and an air inlet 24 is installed at the top of the upper cavity of cylinder 2 to ensure that the internal and external pressures are equal and that the paint flows smoothly. A pipe and paint return control valve 23 are installed in the upper part of the upper cavity of cylinder 2, and the paint return control valve 23 is kept in the open state. The prepared paint is delivered from the paint mixing cylinder to the lower cavity of the cylinder by the paint delivery pump 21. As the delivery time increases, the liquid level of the paint continuously rises, so that the paint fills the cylinder. The lower cavity, through the lower circular fixed clamping mechanism's lower paint flow hole, the inside of the conduit, and the upper circular movable clamping mechanism 26's upper paint flow hole channel, relies on pressure to bring the paint to the upper cavity of the cylinder. When the paint level reaches the paint drain port of the upper cavity, the paint will automatically flow back to the paint mixing cylinder along the pipe through the paint return control valve 23, forming a paint circulation channel. During this process, under the pressure of the paint on the inner wall of the conduit, the paint is deposited on the inner wall of the conduit, completing the painting work on the inner wall of the conduit. A pipe and a paint drain valve 6 are installed at the upper position of the lower cavity of the cylinder 2. After the painting is completed, the paint delivery pump 21 is turned off to stop the paint delivery; the valve of the paint drain valve 6 is opened and the valve of the paint return control valve 23 is closed, so that the paint flows back to the paint mixing cylinder along the paint drain pipe at the bottom of the cylinder, completing the paint recovery work. This process reduces the volatilization of paint in the air, reduces paint usage, and reduces pollutant emissions.

[0065] Finally, the exhaust hood 25 installed at the top of the cylinder is connected to the exhaust fan 32, the exhaust gas treatment device 31, and the exhaust duct 30 by a pipe and is controlled by a valve. The exhaust gas generated during the painting process is collected by the exhaust hood and discharged to the exhaust gas treatment device 31 for treatment under the action of the exhaust fan 32 and the control of the valve 29. The treated exhaust gas meets the emission standards. At the same time, the increased airflow speed accelerates the curing and drying speed of the paint layer.

[0066] In this technical solution, the working principle of the integrated automatic device for painting the inner wall of slender conduit-like parts is as follows: A parts clamping system, a paint mixing and conveying system, an automated painting and paint circulation system, and a waste gas collection and treatment system are integrated. A steel equipment support platform is set up, on which a cylinder is placed. A lower inclined plate is welded to the lower layer of the cylinder towards the paint discharge side and sealed to allow automatic paint drainage. One end of the slender conduit-like part is inserted into the clamping hole with a rubber ring in the lower circular fixed clamping mechanism. The state of the part and the upper circular movable clamping mechanism is adjusted so that the other end of the part is inserted into the clamping hole with a rubber ring in the upper circular movable clamping mechanism, pressing the upper circular movable clamping mechanism tightly against the circular ribs in the upper part of the cylinder to achieve a sealing effect, completing the parts clamping work and forming a paint flow path. The base material, diluent, and curing agent in the base material cylinder, diluent cylinder, and curing agent cylinder are respectively transported to the paint mixing cylinder according to the required proportions through the base material circulation pump, diluent circulation pump, curing agent circulation pump, and corresponding flow meters and pipelines. The three components of base material, diluent, and curing agent are fully mixed under the action of the paint agitator to prepare the paint used in production. The prepared paint is pumped from the paint mixing cylinder to the lower cavity of the cylinder via a paint delivery pump. As the delivery time increases, the paint level rises, filling the lower cavity. The paint then flows through the lower circular fixed clamping mechanism's lower flow hole, the inside of the guide tube, and the upper circular movable clamping mechanism's upper flow hole channel. Pressure forces the paint to the upper cavity. When the paint level reaches the upper cavity's drain port, the paint flows back to the mixing cylinder automatically through the pipe and paint return control valve, forming a paint circulation channel. During this process, the pressure of the paint on the inner wall of the guide tube causes it to deposit, completing the inner wall coating. After coating, the paint delivery pump is turned off, stopping the paint delivery. The paint drain valve is opened, and the paint return control valve is closed, allowing the paint to flow back to the mixing cylinder through the lower paint drain pipe, completing the paint recovery process. The waste gas generated during the painting process is collected centrally through a waste gas collection hood and then discharged to a waste gas treatment device under the control of an exhaust fan and air valves. The treated waste gas meets emission standards. Simultaneously, the increased airflow velocity accelerates the curing and drying speed of the paint layer. This process achieves automatic paint mixing and recycling, which is not only highly efficient but also reduces paint volatilization, improves paint utilization, reduces pollutant emissions, and ensures product quality.

[0067] (1) This integrated automatic painting device can perfectly combine the functions of automatic paint mixing, parts painting, waste gas collection and treatment into one device, replacing the functions of three sets of equipment in the traditional sense, greatly reducing equipment investment costs. The area occupied by this device is smaller than that of traditional equipment.

[0068] (2) The device adopts automated operation, making operation more convenient; the integrated automatic conduit component inner wall painting device supplies paint by pressurizing the paint supply pump, so that the paint is in contact with the pipe wall during the flow of the conduit, and under the action of fluid pressure, a layer of paint is applied to the pipe wall, thus completing the inner wall painting of the conduit.

[0069] (3) The device is equipped with an automatic paint supply system, which forms three independent circulation systems for the hardener, base material and thinner of the paint. The hardener, base material and thinner are automatically supplied to the paint channel in a certain proportion. When no addition is needed, the three independent circulation systems are constantly circulating internally, which will prevent the hardener, base material and thinner in the circulation pipeline from depositing and failing. This improves the accuracy and precision of paint mixing, reduces the number of pipeline cleanings and paint waste, reduces pollutant emissions and achieves green production.

[0070] (4) The mixed paint of this device is recycled. After multiple cycles, almost all of the paint is used to coat the inner wall of the conduit parts. Compared with the traditional spray painting process, the paint utilization rate has increased several times, which greatly reduces paint waste, lowers costs, and reduces pollutant emissions.

[0071] (5) The device is relatively closed, which is more conducive to the precise collection of waste gas compared with the traditional one, and a waste gas treatment device is set up to achieve the standard emission of pollutants.

[0072] The method and steps for painting the inner wall of slender conduit-like parts using this device are as follows:

[0073] Step 1: Remove the upper circular movable clamping mechanism 26;

[0074] Step 2: Insert one end of the slender tube-like part into the clamping hole with the rubber ring of the lower circular fixed clamping mechanism, and make all parts vertical.

[0075] Step 3: Insert one end of the slender conduit-like part into the clamping hole with the rubber ring of the lower circular fixed clamping mechanism, adjust the state of the part and the upper circular movable clamping mechanism 26, so that the other end of the part is inserted into the clamping hole with the rubber ring of the upper circular movable clamping mechanism, press the upper circular movable clamping mechanism 26 tightly, so that it is tightly combined with the circular ribs in the upper part of the cylinder to achieve a sealing effect and complete the part clamping work.

[0076] Step 4: Open the air valve 29, the exhaust gas treatment device 31, and the exhaust fan 32;

[0077] Step 5: Turn on the paint mixer 7;

[0078] Step 6: Start the base material circulation pump 19, the thinner circulation pump 17, and the curing agent circulation pump 15. The base material, thinner, and curing agent in the base material cylinder 10, the thinner cylinder 12, and the curing agent cylinder 14 are automatically transported to the paint mixing cylinder according to the required proportions. The three components of base material, thinner, and curing agent are fully mixed under the action of the paint agitator to prepare the paint used in production.

[0079] Step 7: Open the paint backflow control valve 23;

[0080] Step 8: Turn on the paint delivery pump 21. The prepared paint is delivered from the paint mixing cylinder to the lower cavity of the cylinder through the paint delivery pump. As the delivery time increases, the liquid level of the paint continuously rises, causing the paint to fill the lower cavity of the cylinder. The paint flows through the lower circular fixed clamping mechanism's lower paint flow hole, the inside of the guide tube, and the upper circular movable clamping mechanism's upper paint flow hole channel. Under pressure, the paint reaches the upper cavity of the cylinder. When the liquid level of the paint reaches the paint discharge port of the upper cavity, the paint will automatically flow back to the paint mixing cylinder through the paint return control valve along the pipe, forming a paint circulation channel. During this process, under the pressure of the paint on the inner wall of the guide tube, the paint is deposited on the inner wall of the guide tube, completing the painting work on the inner wall of the guide tube.

[0081] Step 9: After the spraying time is reached, open the paint drain valve 6 and close the paint return control valve 23 to allow the paint to flow back to the paint mixing cylinder along the paint drain pipe at the bottom of the cylinder, thus completing the paint recycling process.

[0082] Step 10: Keep the exhaust fan 32 running throughout the painting process to accelerate the drying and curing speed of the parts and complete the drying and curing of the painted parts.

[0083] Step 11: Lift and remove the upper circular movable clamping mechanism 26;

[0084] Step 12: Remove the part from the circular movable clamping mechanism and hand it over for inspection.

Claims

1. A device for painting the inner wall of a slender conduit-like part, characterized in that, The device includes: A parts clamping system for holding both ends of slender, tubular parts; The paint mixing and conveying system is used to automatically mix paint and automatically convey the mixed paint to the automated painting and paint circulation system. The paint mixing and conveying system includes a paint mixer, a paint mixing cylinder, a base material cylinder, a thinner cylinder, a hardener cylinder, a hardener circulation pump, a thinner circulation pump, and a base material circulation pump. An automated painting and paint circulation system is connected to the paint mixing and conveying system and the parts clamping system; the automated painting and paint circulation system is used to paint the inner wall of the slender conduit-like parts and circulate the paint; the automated painting and paint circulation system includes a paint drain valve, a paint conveying pump, and a paint return control valve; The waste gas collection and treatment system is connected to the automated painting and paint circulation system. The waste gas collection and treatment system is used to collect waste gas during the painting process and treat the waste gas. The waste gas collection and treatment system includes a wind hood, a wind valve, a waste gas treatment device, and an exhaust fan. The wind hood is installed at the top of the cylinder. The wind hood is connected to the wind valve and the exhaust fan through a ventilation pipe, which accelerates the gas flow and speeds up the curing and drying of the paint layer. The parts clamping system includes: a cylinder; a lower circular fixed clamping mechanism disposed in the lower part of the cylinder, the lower circular fixed clamping mechanism being used to fix the lower end of the slender conduit-like parts; and an upper circular movable clamping mechanism disposed in the upper part of the cylinder, the upper circular movable clamping mechanism being used to fix the upper end of the slender conduit-like parts. The lower circular fixed clamping mechanism is the same as the upper circular movable clamping mechanism; The lower circular fixed clamping mechanism includes: a flat plate disposed in the lower part of the cylinder; a small circular hole disposed on the flat plate; a rubber ring installed in the small circular hole to form a clamping hole; the clamping hole is used to fix the lower end of the slender conduit-like part; and a paint flow hole disposed on the flat plate, the paint flow hole communicating with the small circular hole; wherein, the inner diameter of the small circular hole is larger than the inner diameter of the paint flow hole, and the inner diameter of the slender conduit-like part is equal to the inner diameter of the paint flow hole; The lower circular fixed clamping mechanism further includes: a lower inclined plate of the cylinder, which is inclinedly disposed in the lower part of the cylinder, the lower inclined plate of the cylinder is located below the flat plate, and a cavity is formed between the lower inclined plate of the cylinder and the flat plate; The cylinder includes: a top cover having an air inlet and an air outlet; wherein the exhaust gas collection and treatment system is connected to the air outlet; The cylinder further includes: a paint inlet, disposed at the lower part of the side wall of the cylinder; wherein paint enters the cavity through the paint inlet; a paint drain outlet, disposed at the lower part of the side wall of the cylinder; wherein paint in the cavity flows out through the paint drain outlet; and a paint liquid outlet, disposed at the upper part of the side wall of the cylinder; wherein paint in the cylinder is returned through the paint liquid outlet. The paint inlet, paint outlet, and paint drain outlet are all connected to the automated painting and paint circulation system.

2. A method for painting the inner wall of a slender conduit-like part using the inner wall painting apparatus as described in claim 1, characterized in that, The method includes: opening the air valve, exhaust gas treatment device, and exhaust fan; turning on the paint agitator; starting the base material circulation pump, thinner circulation pump, and hardener circulation pump, automatically conveying the base material, thinner, and hardener from the base material cylinder, thinner cylinder, and hardener cylinder to the paint mixing cylinder according to the required proportions; the three components of base material, thinner, and hardener are fully mixed under the action of the paint agitator to prepare the paint for production; opening the paint return control valve; and starting the paint delivery pump to convey the prepared paint from the paint mixing cylinder to the lower cavity of the cylinder. As the delivery time increases, the paint level rises continuously, filling the lower cavity of the cylinder. The paint then flows through the lower circular fixed clamping mechanism's lower paint flow hole, the inside of the guide tube, and the upper circular movable clamping mechanism's upper paint flow hole channel. Pressure forces the paint to reach the upper cavity of the cylinder. When the paint level reaches the paint drain port in the upper cavity, the paint flows back to the paint mixing cylinder automatically through the paint return control valve, forming a paint circulation channel. During this process, the pressure of the paint on the inner wall of the guide tube causes the paint to deposit on the inner wall, completing the painting process on the inner wall of the guide tube.

3. The method according to claim 2, characterized in that, Before opening the air valve, exhaust gas treatment device, and exhaust fan, the following steps are also included: Remove the upper circular movable clamping mechanism; insert one end of the slender conduit-like part into the clamping hole with rubber ring of the lower circular fixed clamping mechanism, ensuring all parts are vertical; insert one end of the slender conduit-like part into the clamping hole with rubber ring of the lower circular fixed clamping mechanism, adjust the state of the part and the upper circular movable clamping mechanism, insert the other end of the part into the clamping hole with rubber ring of the upper circular movable clamping mechanism, press the upper circular movable clamping mechanism tightly, so that it is tightly combined with the circular ribs in the upper part of the cylinder to achieve a sealing effect, and complete the part clamping work.

4. The method according to claim 3, characterized in that, The method further includes: After the spraying time is reached, open the paint drain valve and close the paint return control valve to allow the paint to flow back to the paint mixing cylinder through the paint drain pipe at the bottom of the cylinder, thus completing the paint recovery process. During the painting process, keep the exhaust fan running to accelerate the drying and curing speed of the parts, thus completing the drying and curing of the paint-removed parts. Lift and move the upper circular movable clamping mechanism away. Pull the parts out of the circular movable clamping mechanism and hand them over for inspection.

Images