A paint spraying device for producing a steel structure sealed door

Abstract

The utility model belongs to the closed door production technical field especially, it relates to including: the outer cover, the outer cover inner chamber is equipped with the disc, the disc end is equipped with the inner cover, the inner cover is fixed with the connecting pipe, the connecting pipe end is equipped with the shower nozzle, and the connecting pipe is equipped with the spray gun away from the end of shower nozzle, the eave of disc is provided with a plurality of connecting strips along the circumferential interval, the connecting strip is arranged between the outer cover and the inner cover, and the adjacent two connecting strips are sealedly assembled with the breathable membrane, the breathable membrane and a plurality of connecting strips are collectively enclosed and form the protective structure for blocking the paint spraying, are used for the blocking protection of paint spraying in the paint spraying operation process, the outer cover lower extreme is equipped with the pipeline no.

Description

Technical Field

[0001] This utility model belongs to the field of airtight door production technology, and in particular relates to a painting device for the production of steel structure airtight doors. Background Technology

[0002] Steel structure protective airtight doors are a type of special equipment widely used in complex environments such as fire rescue, gas accumulation sealing, and high-temperature fire control. Their core feature is that they combine high strength with good sealing performance. In order to ensure the durability and safety of steel structure protective airtight doors during long-term service, a painting process is usually required on the surface of the door during the production process. This painting process not only improves the corrosion resistance of the door and extends its service life, but also improves the appearance quality of the door. Therefore, it has become an indispensable key link in the entire production process.

[0003] In current production practices, spray painting operations typically use spray guns as the primary construction tool. The spray gun atomizes the paint at high speed and deposits it onto the surface of steel structure protective airtight doors. This process offers advantages in terms of ease of operation and a certain degree of construction efficiency. However, due to the unavoidable airflow impact and atomization effect during spray painting, a large number of paint particles fail to effectively adhere to the door surface and diffuse outwards. These undeposited paint particles scatter throughout the work environment, not only polluting surrounding equipment, floors, and walls, increasing cleaning and maintenance difficulties, but also causing significant waste of raw materials, leading to high production costs. Furthermore, the paint mist generated during spray painting remains suspended in the air for extended periods, containing irritating volatile organic compounds and aerosols that severely deteriorate the air quality in the work environment, posing a potential threat to the health of operators. Under high concentration conditions, it can even trigger combustion and explosion accidents, becoming a long-standing technical challenge in the spray painting process.

[0004] To address the issues of low efficiency and unstable door fixing in the painting process, relevant technical personnel have proposed several improvement solutions. For example, Chinese patent CN210304220U discloses a painting device for producing steel structure protective airtight doors. This patented technology includes a door frame, a support plate installed on the top inner surface of the door frame, a height adjustment rod installed on the bottom surface of the support plate, and a support bracket installed at the bottom end of the height adjustment rod. Sliding grooves are provided on the two inner walls of the door frame, with screws installed inside the sliding grooves and sliding blocks installed on the outer side of the screws. A drive assembly is installed on the upper surface of the door frame. A fixing plate is installed at the outer end of the sliding blocks, and several spray guns are installed on the surface of the fixing plate. This technology improves painting efficiency to a certain extent, reduces the inefficiency and safety risks caused by manual painting, and also improves the stability of the door during the painting process.

[0005] However, the core design concept of the above solutions focuses on improving painting efficiency and door fixation security, but fails to provide effective solutions to the problems of paint mist splattering and particle suspension generated during the painting process. Therefore, those skilled in the art provide a painting device for the production of steel structure airtight doors to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this utility model is to address the aforementioned technical problems by providing a painting device for the production of steel structure airtight doors, which can prevent paint splattering during painting, filter the air during painting, and collect paint from the air.

[0007] In view of this, the present invention provides a painting device for the production of steel structure airtight doors, comprising: An outer cover has a disc installed inside its cavity, and an inner cover is installed at the end of the disc. The inner cover is fixed to a connecting pipe. A nozzle is installed at the end of the connecting pipe, and a spray gun is installed at the end of the connecting pipe away from the nozzle. Multiple connecting strips are spaced apart circumferentially along the outer edge of the disc. The connecting strips are located between the outer cover and the inner cover, and a breathable membrane is sealed between two adjacent connecting strips. The breathable membrane and the multiple connecting strips together form a protective structure for blocking paint splashes during the painting process. The lower end of the outer cover is equipped with a pipe, and the upper end of the pipe is connected to the breathable membrane. A collection bottle is detachably installed at the lower end of the pipe. The collection bottle is used to filter and collect the paint spray in the air.

[0008] Furthermore, a ring is provided at the ends of the multiple connecting strips away from the spray gun, and the ring is flush with the ends of the inner cover and the outer cover away from the spray gun.

[0009] Furthermore, the breathable membrane, connecting strip, disc, and ring together form a trumpet-shaped cover, and the outer cover and inner cover have a trumpet-shaped structure.

[0010] Furthermore, a second pipe is installed on the upper end of the outer cover, and the second pipe is connected to an external air pump via a flexible hose.

[0011] Furthermore, the outer wall of the inner cover is provided with multiple air guide holes in a ring array, and the multiple air guide holes are connected to the inner cavity of the inner cover.

[0012] Furthermore, the outer cover has a through hole one at its end, the disc has a through hole two at its end, the inner cover has a through hole three at its end, and the connecting pipe extends into the inner cavity of the inner cover through through through holes one, two, and three.

[0013] Furthermore, a guide pipe is installed at the lower end of the spray gun, and the guide pipe is connected to an external raw material conveying power source.

[0014] Furthermore, the lower end of the outer cover has a second circular hole, the lower end of the breathable membrane has a first circular hole, the upper end of the first pipe extends through the second circular hole into the first circular hole, and the outer wall of the first pipe is fixed to the inner walls of the first and second circular holes.

[0015] Furthermore, the upper end of the outer cover is provided with a circular hole three, the lower end of the pipe two extends into the circular hole three, and the outer wall of the pipe two is fixed to the inner wall of the circular hole three.

[0016] Furthermore, a connecting cap is installed at the lower end of the pipe, and a threaded groove is opened at the lower end of the connecting cap. A threaded ring is fixed at the upper end of the collection bottle, and the threaded ring extends into the threaded groove for threaded connection.

[0017] Compared with existing technologies, the painting device for producing steel structure airtight doors described in this utility model has the following advantages: When painting a steel structure airtight door, this invention involves attaching the outer cover, ring, and inner cover to the steel structure airtight door. The door is then painted using a spray gun, connecting pipe, and nozzle. Simultaneously, an external air pump connected to a hose is activated to extract air. Air and paint from the inner cavity of the inner cover enter the gap between the inner cover and the breathable membrane through air vents. The air is discharged through the breathable membrane, while the paint is intercepted and collected in a collection bottle. This achieves the effects of preventing paint splattering during spraying, filtering the air during spraying, and collecting paint from the air. Attached Figure Description

[0018] Figure 1 This is a first-view perspective three-dimensional schematic diagram of this utility model; Figure 2 This is a second-view perspective three-dimensional schematic diagram of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is the utility model Figure 3 Enlarged view of point A; Figure 5 This is the utility model Figure 3 Enlarged view of point B; Figure 6 This is a sectional view of the collection bottle and connecting cap of this utility model separated. Figure 7 This is a three-dimensional schematic diagram of the spray gun of this utility model; Figure 8 This is a three-dimensional schematic diagram of the inner cover of this utility model; Figure 9 This is a three-dimensional schematic diagram of the connection between the ring, the breathable membrane, and the disc of this utility model; The markings in the diagram are as follows: 1. Collection bottle; 2. Pipe 1; 3. Outer cover; 4. Ring; 5. Inner cover; 6. Pipe 2; 7. Hose; 8. Spray gun; 9. Feed pipe; 10. Air guide hole; 11. Breathable membrane; 12. Round hole 1; 13. Round hole 2; 14. Round hole 3; 15. Connecting cap; 16. Nozzle; 17. Connecting pipe; 18. Connecting strip; 19. Disc; 20. Threaded groove; 21. Threaded ring. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0020] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connection arrangements between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0022] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] Please see Figures 1 to 9 The embodiments provided by this utility model are as follows: Example: A painting device for producing steel structure airtight doors, comprising: The outer cover 3 has a disc 19 installed inside its cavity. An inner cover 5 is installed at the end of the disc 19. The inner cover 5 is fixed to the connecting pipe 17. A nozzle 16 is installed at the end of the connecting pipe 17, and a spray gun 8 is installed at the end of the connecting pipe 17 away from the nozzle 16. Multiple connecting strips 18 are arranged circumferentially along the outer edge of the disc 19. The connecting strips 18 are arranged between the outer cover 3 and the inner cover 5. A breathable membrane 11 is sealed between two adjacent connecting strips 18. The breathable membrane 11 and the multiple connecting strips 18 together form a protective structure for blocking paint splashes, which is used to block and protect against paint splashes during the painting operation. The lower end of the outer cover 3 is equipped with a pipe 2, and the upper end of the pipe 2 is connected to the breathable membrane 11. The lower end of the pipe 2 is detachably equipped with a collection bottle 1, which is used to filter and collect the paint spray in the air.

[0024] In the example of this application, the outer cover 3 serves as the external protective frame of the device, providing a basic protective space for the entire painting operation. The disc 19 installed in its inner cavity not only plays a connecting and supporting role, but also forms an internal painting operation chamber through the inner cover 5 installed at the end. The inner cover 5 is fixedly connected to the connecting pipe 17, so that the connecting pipe 17 can stably deliver the paint to the nozzle 16 installed at the end, thereby ensuring that the nozzle 16 can stably spray paint onto the steel structure airtight door during the painting process. The spray gun 8 installed at the end of the connecting pipe 17 away from the nozzle 16 provides the operator with a convenient control component, which makes it easy to adjust the paint pressure according to the painting needs.

[0025] Meanwhile, multiple connecting strips 18 spaced circumferentially along the outer edge of the disc 19 are distributed between the outer cover 3 and the inner cover 5. A breathable membrane 11, sealed between adjacent connecting strips 18, together with the multiple connecting strips 18, forms a protective structure to block paint splatter. During painting operations, this effectively blocks paint splatter, preventing paint from spreading into the external environment. This protects the cleanliness of the work environment, reduces paint waste, and lowers the potential health hazards of paint to operators. In addition, the pipe 2 installed at the lower end of the outer cover 3 is connected to the breathable membrane 11 at its upper end and the collection bottle 1, which can be detachably installed at its lower end, can filter and collect the paint suspended in the air during the painting process. When paint particles generated during the painting operation enter the space formed by the breathable membrane 11, the outer cover 3, and the inner cover 5 with the airflow, the breathable membrane 11 will block the paint particles, causing them to gradually gather and enter the collection bottle 1 through the pipe 2, realizing the recycling of paint, further reducing resource waste, and also reducing the pollution of waste paint to the environment.

[0026] Furthermore, a ring 4 is provided at the ends of the multiple connecting strips 18 away from the spray gun 8, and the ring 4 is flush with the ends of the inner cover 5 and the outer cover 3 away from the spray gun 8.

[0027] As a preferred example of this utility model, the ring 4 firstly plays a good role in connecting and fixing the multiple connecting strips 18, so that the originally spaced connecting strips 18 form an overall frame, which enhances the overall strength of the protective structure formed by the connecting strips 18 and the breathable membrane 11, and ensures that the protective structure can play a long-term and stable role in blocking paint splashes.

[0028] Secondly, the flush design of the ring 4 with the inner cover 5 and the outer cover 3 at the ends furthest from the spray gun 8 allows the device to form a tighter and more regular contact surface when it is in contact with the steel structure airtight door for painting operations. The flush structure reduces the gaps between the device and the steel structure airtight door, thereby further preventing paint leakage from the gaps during the painting process and improving the sealing performance of the protection.

[0029] Furthermore, the breathable membrane 11, connecting strip 18, disc 19 and ring 4 together form a trumpet-shaped cover, with the outer cover 3 and inner cover 5 having a trumpet-shaped structure.

[0030] As a preferred example of this utility model, the trumpet-shaped structure brings several advantages to the painting operation. The trumpet-shaped structure allows the opening end of the device to form a larger working area. When painting steel structure airtight doors, it can more comprehensively cover the surface to be painted, reducing the need for multiple adjustments to the device position due to limited working area and improving the efficiency of the painting operation. The inner wall of the trumpet-shaped cover has a certain angle of inclination. During the painting process, even if a small amount of paint splashes onto the inner wall of the cover, it will gradually collect downwards along the inclined inner wall, making it easier to be collected in the collection bottle 1 through pipe 2, further reducing paint waste. At the same time, the trumpet-shaped outer cover 3 and inner cover 5 can better cooperate with the trumpet-shaped protective structure to form a multi-layered protective system, enhancing the ability to block paint splashes and effectively preventing paint from spreading into the external environment.

[0031] Furthermore, a pipe 6 is installed on the upper end of the outer cover 3, and the pipe 6 is connected to an external air pump through a hose 7.

[0032] As a preferred example of this utility model, after the external air pump is started, it will draw air from the space between the outer cover 3 and the inner cover 5 through the hose 7 and the pipe 6, creating a negative pressure environment. The negative pressure environment can effectively guide the air in the inner cavity of the inner cover 5 and the paint particles generated during the painting process to flow into the space between the outer cover 3 and the inner cover 5, creating conditions for subsequent paint filtration and air discharge. During the painting process, negative pressure can promptly remove excess paint mist generated during painting, preventing paint mist from spreading in the inner cavity of the inner cover 5, thereby reducing defects caused by paint mist adhering to the painted surface and ensuring the smoothness and uniformity of the painted surface of the steel structure airtight door.

[0033] Furthermore, the outer wall of the inner cover 5 has multiple air guide holes 10 arranged in a ring array, and the multiple air guide holes 10 are connected to the inner cavity of the inner cover 5.

[0034] As a preferred example of this utility model, when the external air pump draws air through pipe 6 and hose 7 to form a negative pressure environment, the air in the inner cavity of the inner cover 5 and the suspended paint particles can be evenly introduced into the space between the inner cover 5 and the outer cover 3 through the air guide holes 10 distributed in a ring array.

[0035] The circular array distribution ensures that air and paint particles in all locations within the inner cavity of the inner cover 5 can be smoothly discharged through the air guide holes 10, avoiding localized poor airflow and paint particle accumulation caused by uneven distribution of the air guide holes 10. Uniform airflow guidance not only helps improve paint collection efficiency, ensuring that as many paint particles as possible are drawn into the space between the outer cover 3 and the inner cover 5, and then collected through the breathable membrane 11 and pipe 2, reducing paint waste, but also ensures stable pressure within the inner cavity of the inner cover 5, preventing excessively high or low local pressure from affecting the stability and uniformity of the painting process, thereby further improving the quality of the painting operation.

[0036] Furthermore, the outer cover 3 has a through hole 1 at its end, the disc 19 has a through hole 2 at its end, and the inner cover 5 has a through hole 3 at its end. The connecting pipe 17 extends into the inner cavity of the inner cover 5 through the through holes 1, 2, and 3.

[0037] As a preferred example of this utility model, the positions of the through hole one, through hole two and through hole three correspond to each other, ensuring that the connecting pipe 17 can smoothly pass through the outer cover 3, the disc 19 and the inner cover 5 and extend into the inner cavity of the inner cover 5, ensuring that the spray nozzle 16 installed at the end of the connecting pipe 17 can be in a suitable painting position, thereby realizing the painting of the steel structure airtight door.

[0038] After the connecting pipe 17 passes through multiple through holes, the inner walls of the multiple through holes will provide multi-directional support and fixation for the connecting pipe 17, effectively preventing the connecting pipe 17 from shaking or shifting due to factors such as paint pressure and air flow during the painting operation.

[0039] Furthermore, a guide pipe 9 is installed at the lower end of the spray gun 8, and the guide pipe 9 is connected to an external raw material conveying power source.

[0040] As a preferred example of this utility model, the external raw material conveying power source can stably convey the paint to the inside of the spray gun 8 through the guide pipe 9, and then, through the control of the spray gun 8 and the transmission of the connecting pipe 17, it is finally sprayed onto the surface of the steel structure airtight door by the nozzle 16.

[0041] A continuous paint supply avoids the interruptions that occur with traditional manual paint addition, ensuring the continuity of painting operations and reducing defects such as seams and color differences on the painted surface caused by paint supply interruptions. This guarantees the overall quality and aesthetics of the painted surface. Simultaneously, the external material delivery power source can flexibly adjust the paint delivery pressure and flow rate according to the needs of the painting operation. With the help of the spray gun 8, it is possible to control different paint thicknesses and effects, meeting the painting requirements of different parts of the steel structure airtight door.

[0042] Furthermore, the lower end of the outer cover 3 is provided with a second round hole 13, the lower end of the breathable membrane 11 is provided with a first round hole 12, the upper end of the pipe 2 extends through the second round hole 13 and into the first round hole 12, and the outer wall of the pipe 2 is fixed to the inner wall of the first round hole 12 and the second round hole 13.

[0043] As a preferred example of this utility model, the opening of the first circular hole 12 and the second circular hole 13 provides positioning for the installation of the first pipe 2, ensuring that the first pipe 2 can be connected to the breathable membrane 11 and the outer cover 3, so that the paint blocked by the breathable membrane 11 can smoothly enter the collection bottle 1 through the first pipe 2. Positioning avoids the situation where the paint leaks or accumulates between the outer cover 3 and the breathable membrane 11 during the transmission process due to the misalignment of the installation position of the first pipe 2, thus ensuring the efficiency of paint collection. The fixed connection between the outer wall of pipe 2 and the inner walls of circular holes 12 and 13 creates a good seal. This sealing structure prevents air from entering the space between the outer casing 3 and the inner casing 5 through the connection between pipe 2 and circular holes 12 and 13 during paint collection, thus ensuring the stability of the negative pressure environment within this space. This ensures that air and paint particles can flow along the preset path, improving the efficiency of paint filtration and collection. Simultaneously, the sealed connection also prevents paint from leaking into the external environment, causing environmental pollution and paint waste, further enhancing the environmental friendliness and economy of the device.

[0044] Furthermore, the upper end of the outer cover 3 is provided with a circular hole 3 14, the lower end of the pipe 2 6 extends into the circular hole 3 14, and the outer wall of the pipe 2 6 is fixed to the inner wall of the circular hole 3 14.

[0045] As a preferred example of this utility model, the circular hole 3 14 allows the lower end of pipe 2 6 to extend into it, achieving docking between pipe 2 6 and outer cover 3. The docking ensures that the external air pump can effectively extract air from the space between outer cover 3 and inner cover 5 through hose 7 and pipe 2 6, forming a stable negative pressure environment and providing sufficient power for the flow of air and paint particles. Meanwhile, the fixed connection between the outer wall of pipe 26 and the inner wall of circular hole 314 forms a reliable sealing structure. This sealing structure prevents air leakage from the connection point between pipe 26 and circular hole 314, avoiding a decrease in negative pressure between the outer cover 3 and inner cover 5 due to air leakage, thus ensuring the stability of the suction effect. This stable suction effect not only ensures smooth flow of air and paint particles, improving paint collection efficiency, but also guarantees timely air renewal within the inner cover 5, reducing the accumulation of volatile gases and creating a safer and healthier working environment for operators.

[0046] Furthermore, a connecting cap 15 is installed at the lower end of pipe 12, and a threaded groove 20 is opened at the lower end of the connecting cap 15. A threaded ring 21 is fixed at the upper end of the collection bottle 1, and the threaded ring 21 extends into the threaded groove 20 for threaded connection.

[0047] As a preferred example of this utility model, a convenient and detachable connection between the collection bottle 1 and the pipe 2 is achieved, which greatly facilitates the cleaning of paint and the maintenance of the collection bottle 1.

[0048] In this embodiment, when painting a steel structure airtight door, the outer cover 3, the ring 4, and the inner cover 5 in the device must first be attached to the surface of the steel structure airtight door to be painted. The attachment operation not only creates a relatively closed working space for the subsequent painting operation, but also, through the synergistic effect of the outer cover 3 and the inner cover 5, initially blocks the paint splashes that may be generated during the painting process, laying the foundation for subsequent protection and collection work. Once all the covers are properly attached, the operator can start the painting operation by controlling the spray gun 8. At this time, the connecting pipe 17 connected to the spray gun 8 will serve as a key channel for paint delivery, stably delivering the paint to the nozzle 16 installed at the end of the connecting pipe 17. The nozzle 16 will then spray the paint evenly and accurately onto the surface of the steel structure airtight door at the preset working position, ensuring that the painting operation can proceed according to the expected process requirements. While the painting operation continues, the external air pump connected to the hose 7 of the device starts simultaneously to begin the air extraction operation. The external air pump applies suction force to the inside of the device through the hose 7, so that a stable negative pressure environment is quickly formed in the inner cavity of the inner cover 5. Under the continuous action of negative pressure, the air mixed with a large number of paint particles generated by the painting in the inner cavity of the inner cover 5 will flow orderly along the pre-set air guide holes 10 on the outer wall of the inner cover 5, and then smoothly enter the gap between the inner cover 5 and the breathable membrane 11, realizing the effective guidance and collection of polluted air. The mixed air entering the gap between the inner cover 5 and the breathable membrane 11 will come into full contact with the breathable membrane 11 under the impetus of the airflow. At this time, the breathable membrane 11 begins to play its core role in separating air and paint by virtue of its filtration performance. The air can pass through the pores of the breathable membrane 11 smoothly and then be discharged outside the device through the pipe 6 connected to the outer cover 3; while the paint particles mixed in the air will be intercepted on the surface of the breathable membrane 11 and cannot pass through with the air. As the painting operation continues and the air extraction is carried out, the paint particles intercepted by the breathable membrane 11 will gradually gather on the surface of the membrane 11 under the natural force of gravity, and slowly flow downwards along the inner wall of the membrane 11. Finally, the gathered paint will smoothly enter the collection bottle 1, which is detachably installed at the lower end of the pipe 2 connected to the lower end of the breathable membrane 11. This achieves both high efficiency and environmental protection requirements for the painting operation, and also reduces material waste and improves the economic efficiency of the operation by recycling the paint.

[0049] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A painting device for producing steel structure airtight doors, characterized in that, include: The outer cover (3) has a disc (19) installed in its inner cavity. An inner cover (5) is installed at the end of the disc (19). The inner cover (5) is fixed to the connecting pipe (17). A nozzle (16) is installed at the end of the connecting pipe (17), and a spray gun (8) is installed at the end of the connecting pipe (17) away from the nozzle (16). Multiple connecting strips (18) are arranged circumferentially on the outer edge of the disc (19). The connecting strips (18) are arranged between the outer cover (3) and the inner cover (5). A breathable membrane (11) is sealed between two adjacent connecting strips (18). The breathable membrane (11) and the multiple connecting strips (18) together form a protective structure for blocking paint splashes, which is used to block and protect paint splashes during the painting operation. The lower end of the outer cover (3) is equipped with a pipe (2), and the upper end of the pipe (2) is connected to the breathable membrane (11). A collection bottle (1) is detachably installed at the lower end of the pipe (2). The collection bottle (1) is used to filter and collect the paint in the air.

2. The painting device for producing steel structure airtight doors according to claim 1, characterized in that, A ring (4) is provided at the end of the plurality of connecting strips (18) away from the spray gun (8), and the ring (4) is flush with the ends of the inner cover (5) and the outer cover (3) away from the spray gun (8).

3. The painting device for producing steel structure airtight doors according to claim 1, characterized in that, The breathable membrane (11), connecting strip (18), disc (19) and ring (4) together form a trumpet-shaped cover, and the outer cover (3) and inner cover (5) have a trumpet-shaped structure.

4. A painting device for producing steel structure airtight doors according to claim 1, 2, or 3, characterized in that, The outer cover (3) is equipped with a second pipe (6) at its upper end, and the second pipe (6) is connected to an external air pump through a hose (7).

5. A painting device for producing steel structure airtight doors according to claim 4, characterized in that, The outer wall of the inner cover (5) is provided with a plurality of air guide holes (10) arranged in a ring array, and the plurality of air guide holes (10) are connected to the inner cavity of the inner cover (5).

6. A painting device for producing steel structure airtight doors according to claim 4, characterized in that, The outer cover (3) has a through hole one at its end, the disc (19) has a through hole two at its end, the inner cover (5) has a through hole three at its end, and the connecting pipe (17) extends into the inner cavity of the inner cover (5) through the through holes one, two and three at its end.

7. A painting device for producing steel structure airtight doors according to claim 4, characterized in that, The lower end of the spray gun (8) is equipped with a guide pipe (9), and the guide pipe (9) is connected to an external raw material conveying power source.

8. A painting device for producing steel structure airtight doors according to claim 4, characterized in that, The outer cover (3) has a second round hole (13) at its lower end, and the breathable membrane (11) has a first round hole (12) at its lower end. The upper end of the first pipe (2) passes through the second round hole (13) and extends into the first round hole (12). The outer wall of the first pipe (2) is fixed to the inner wall of the first round hole (12) and the second round hole (13).

9. A painting device for producing steel structure airtight doors according to claim 4, characterized in that, The outer cover (3) has a circular hole three (14) at its upper end, and the lower end of the pipe two (6) extends into the circular hole three (14), and the outer wall of the pipe two (6) is fixed to the inner wall of the circular hole three (14).

10. A painting device for producing steel structure airtight doors according to claim 4, characterized in that, The lower end of the pipe (2) is equipped with a connecting cover (15), and the lower end of the connecting cover (15) is provided with a threaded groove (20). The upper end of the collection bottle (1) is fixed with a threaded ring (21), and the threaded ring (21) extends into the threaded groove (20) for threaded connection.

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