Paint spraying and drying system for steel structure

Abstract

The invention relates to the technical field of steel structure surface treatment, solves the problems that the surface of a steel structure member needs manual rust removal and paint spraying, and the processing quality level is difficult to control, and particularly discloses a paint spraying and drying system for a steel structure, which comprises movable supporting equipment, paint spraying and drying equipment and gas collecting equipment, the movable supporting equipment is arranged at the bottom of the paint spraying and drying equipment, and the gas collecting equipment covers the movable supporting equipment and the paint spraying and drying equipment; the bottom of the paint spraying and drying equipment is connected with a walking device, the paint spraying and drying equipment comprises a laser rust removal device, a spraying device and a drying device which are sequentially arranged in the horizontal direction, the laser rust removal device is arranged at the inlet end of the paint spraying and drying equipment, and the drying device is arranged at the outlet end of the paint spraying and drying equipment. The laser rust removal device, the spraying device and the drying device are all connected with a linkage control box. The device is used for surface rust removal, paint spraying and drying automatic machining of the steel structural component, efficiency is high, and the machining quality is more stable.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure surface treatment, in particular to a paint spraying and drying system for steel structures. Background Art

[0002] As a new type of building structure, prefabricated steel structures are comprised of various components fabricated from steel sections and steel plates, primarily including steel columns, beams, staircases, and supports. During assembly, components are primarily connected through welding, bolting, and rivets. Due to their unique advantages, prefabricated steel structures have found widespread application in a variety of fields, including factories, stadiums, and residential buildings.

[0003] During the production process of prefabricated steel structure components, to ensure their durability and structural stability, surface treatment processes such as shot blasting are often used to remove scale, rust, and other impurities from the steel surface, laying the foundation for subsequent coating and protection. However, in the production process of prefabricated steel structures, rust removal and spraying, two key steps, are still mostly completed manually, and there are many problems that need to be solved:

[0004] During the rust removal process, manual operation cannot guarantee uniform and consistent rust removal results. Incomplete rust removal may lead to accelerated corrosion in some areas, affecting the service life of the structure. Furthermore, manual rust removal is inefficient and cannot meet the needs of large-scale production, which restricts the production progress of steel structure components. Manual spraying also presents significant drawbacks. Manual operation is significantly affected by factors such as the operator's skill level, experience, and physical strength, and is prone to quality issues such as uneven coating thickness, spray leaks, and sagging, which reduce the protective performance of steel structure components. Furthermore, during the manual spraying process, volatile paint is directly emitted into the air, causing serious environmental pollution. This not only endangers the health of the operator but also violates the current trend of environmental protection and energy conservation. With the country's increasingly stringent environmental protection requirements for the construction industry and the urgent need to improve industrial production efficiency, existing manual rust removal and spraying methods are no longer able to meet the sustainable development needs of the prefabricated steel structure industry. A highly automated, efficient, and environmentally friendly rust removal and spraying technology is urgently needed to replace it. Summary of the Invention

[0005] In order to solve the problems in the prior art that the surface of steel structure components requires manual rust removal and paint spraying, the production period is long, and the processing quality level is difficult to control, the present invention provides a paint spraying and drying system for steel structures.

[0006] The technical solution adopted in the present invention is:

[0007] A paint spraying and drying system for steel structures, comprising a movable support device, a paint spraying and drying device, and a gas collection device, wherein the movable support device is arranged at the bottom of the paint spraying and drying device, and the gas collection device is covered outside the movable support device and the paint spraying and drying device;

[0008] The paint spray drying equipment is connected to a walking device at the bottom, and the paint spray drying equipment includes a laser rust removal device, a spraying device and a drying device arranged in sequence in a horizontal direction. The laser rust removal device is arranged at the inlet end of the paint spray drying equipment, and the drying device is arranged at the outlet end of the paint spray drying equipment. The laser rust removal device, the spraying device and the drying device are all connected to a linkage control box;

[0009] The laser rust removal device, spraying device and drying device are used to act on the component to be processed on the bottom movable support device in sequence for processing; the movable support device is used to adapt to the size of the component to be processed and provide supporting force through disassembly and installation; the gas collection device is used to collect and transport the exhaust gas generated during the processing.

[0010] Furthermore, the laser rust removal device is respectively provided with a pulse fiber laser and a visual positioning system. The visual positioning system is used to identify the rusted area through visual camera scanning and send a signal to the laser rust removal device, so that the laser rust removal device adjusts the scanning trajectory according to the signal.

[0011] Furthermore, the spraying device is provided with multiple groups of spraying robotic arms, each of the spraying robotic arms is provided with a six-axis manipulator, each of the six-axis manipulators is provided with a spray gun, and the movable support device is provided with an adjustable tooling;

[0012] The six-axis manipulator is used to adjust the angle of the spray gun through multi-degree-of-freedom joints, and to spray the entire surface of the component to be processed in conjunction with the rotation of the adjustable tooling.

[0013] Furthermore, the drying device includes a hot air circulation mechanism and an infrared heating mechanism. The hot air circulation mechanism is used to spray hot air through an electric heating function to form an internal circulating hot air, and the infrared heating mechanism is used to assist in raising the temperature inside the drying device through infrared heating.

[0014] Furthermore, the gas collection equipment includes a telescopic canopy, which is arranged outside the movable support equipment and the paint spray drying equipment. The telescopic canopy is connected to an exhaust gas recovery device, the air inlet end of the exhaust gas recovery device is connected to the interior of the telescopic canopy, an exhaust gas treatment device is provided in the exhaust gas recovery device, and the air outlet end of the exhaust gas recovery device is connected to an exhaust pipe;

[0015] Among them, the telescopic canopy is used to adjust the length by telescoping to adapt to the size of the processed components, the exhaust gas recovery device is used to collect the exhaust gas in the telescopic canopy by generating negative pressure through the fan, and the exhaust gas treatment device is used to harmlessly treat the exhaust gas.

[0016] Furthermore, the exhaust gas treatment device includes an activated carbon adsorption unit and a catalytic combustion module connected in sequence, and the activated carbon adsorption unit and the catalytic combustion module are respectively connected to the air inlet and the air outlet of the exhaust gas recovery device;

[0017] The activated carbon adsorption unit is used to absorb harmful gases in the exhaust gas, and the catalytic combustion module is used to perform catalytic combustion treatment on the combustible gases in the exhaust gas.

[0018] Furthermore, a channel opening is provided at one end of the gas collecting device for accommodating the components to be processed, and an air curtain is provided on the gas collecting device above the channel opening. The air curtain is used to form an air curtain by jetting to prevent internal gas from overflowing.

[0019] Furthermore, the movable support device includes multiple groups of movable tire frames, the top of the movable tire frame is provided with an I-shaped bracket for supporting the component to be processed, and the bottom of the movable tire frame is provided with a tire frame base connected to the I-shaped bracket.

[0020] The beneficial effects of the present invention are:

[0021] The present invention forms an automated processing system by integrating movable support equipment, paint spraying and drying equipment, and gas collection equipment, which systematically solves the problems of manual rust removal and spraying. During operation, the component to be processed is supported by the movable support equipment, which can be flexibly adjusted to adapt to components of different sizes to ensure stable support. Subsequently, the paint spraying and drying equipment moves with the help of a walking device, so that the laser rust removal device, the spraying device, and the drying device act on the component in turn. The laser rust removal device first removes rust from the surface of the component, replacing manual polishing, and ensures uniform and thorough rust removal through precise laser action; the spraying device automatically completes the paint spraying, avoiding coating problems caused by manual operation; the drying device solidifies the coating to enhance the protective effect. The entire process is coordinated by the linkage control box to achieve continuous automated processing. At the same time, the gas collection equipment collects and treats the waste gas generated during processing to reduce environmental pollution. The automated rust removal and spraying eliminates differences in manual operations, ensures uniform treatment results, and improves component quality stability and durability; the continuous operation process greatly improves production efficiency and meets large-scale production needs; centralized waste gas treatment avoids direct emission of paint volatiles, which not only protects the health of operators, but also meets environmental protection requirements, and effectively solves the quality, efficiency and environmental protection problems of traditional manual methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of the paint spraying and drying system of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the paint spray drying equipment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the gas collection device of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the movable tire frame of the present invention.

[0026] Reference numerals:

[0027] 1- Movable support equipment, 2- Paint spraying and drying equipment, 3- Gas collection equipment,

[0028] 11- movable tire frame, 111- I-shaped bracket, 112- tire frame base,

[0029] 21- walking device, 22- laser rust removal device, 23- spraying device, 231- spraying robot arm, 24- drying device, 25- linkage control box,

[0030] 31- telescopic canopy, 32- exhaust gas recovery device, 33- discharge pipe, 34- air curtain machine. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0032] Example 1

[0033] A paint spraying and drying system for steel structures includes a movable support device 1, a paint spraying and drying device 2, and a gas collection device 3. The movable support device 1 is arranged at the bottom of the paint spraying and drying device 2, and the gas collection device 3 is covered outside the movable support device 1 and the paint spraying and drying device 2. The bottom of the paint spraying and drying device 2 is connected to a walking device 21. The paint spraying and drying device 2 includes a laser rust removal device 22, a spraying device 23, and a drying device 24 arranged in sequence along a horizontal direction. The laser rust removal device 22 is arranged at the inlet end of the paint spraying and drying device 2, and the drying device 24 is arranged at the outlet end of the paint spraying and drying device 2. The laser rust removal device 22, the spraying device 23, and the drying device 24 are all connected to a linkage control box 25.

[0034] Specifically, the laser rust removal device 22, the spraying device 23 and the drying device 24 are used to act in sequence on the component to be processed on the bottom movable support device 1 for processing; the movable support device 1 is used to adapt to the size of the component to be processed by disassembly and installation and provide supporting force; the gas collection device 3 is used to collect and transport the exhaust gas generated during the processing.

[0035] In this embodiment, the component to be processed is placed on a movable support device 1. The movable support device 1 is adjustable through disassembly and assembly to adapt to the component size and provide stable support. The paint spraying and drying equipment 2 is adjusted in position using a bottom running device 21. Inside, a laser rust removal device 22, a spraying device 23, and a drying device 24, arranged horizontally in sequence, operate sequentially under the coordination of a linkage control box 25: the laser rust removal device 22 first removes rust from the component surface, followed by the spraying device 23 applying the paint, and finally, the drying device 24 cures the paint. A gas collection device 3, housed externally, collects exhaust gases generated during the entire process. By integrating and automating various devices, this system achieves seamless operation of rust removal, spraying, and drying. The adjustability of the movable support device 1 allows it to accommodate components of varying sizes, and the gas collection device 3 effectively reduces exhaust gas leakage. During operation, the movable support device 1 must maintain firm contact with the component to ensure stability. The operating sequence of each device must be precisely controlled by the linkage control box 25. The fit of the gas collection device 3 and the paint spraying and drying equipment 2 must also be monitored to prevent exhaust gas leakage from affecting collection efficiency.

[0036] The system of the present invention is equipped with a PLC central controller and an industrial Internet of Things platform, which enables remote monitoring, fault diagnosis, and process parameter optimization. It can remotely monitor the operating status of equipment, promptly diagnose faults, and optimize process parameters based on processing data. This control system can improve equipment operation and maintenance efficiency and processing accuracy. Those skilled in the art can directly apply the specific platform control functions to the present invention based on existing corresponding device control technologies in the relevant art, and will not be elaborated here.

[0037] Example 2

[0038] This embodiment is based on the previous embodiment. In this embodiment, the laser rust removal device 22 is respectively equipped with a pulse fiber laser and a visual positioning system. The visual positioning system is used to scan and identify rusted areas through a visual camera and send a signal to the laser rust removal device 22, so that the laser rust removal device 22 adjusts the scanning trajectory according to the signal. When the laser rust removal device 22 is working, the visual positioning system scans the surface of the component to be processed through the visual camera, identifies the rusted area, and sends a signal to the laser rust removal device 22. The laser rust removal device 22 adjusts the scanning trajectory of the pulse fiber laser in real time based on the received signal to ensure that the laser energy is concentrated on the rusted area. This embodiment uses the coordinated work of visual recognition and laser scanning to achieve precise positioning and targeted treatment of rusted areas, avoiding unnecessary treatment of non-rusted areas in existing rust removal equipment, improving rust removal efficiency and accuracy, and reducing energy waste. During implementation, the camera of the visual positioning system needs to be calibrated regularly to ensure its recognition accuracy. At the same time, the power of the pulse fiber laser is set according to the component material and the degree of rust to avoid excessive power damaging the component body or excessive power causing incomplete rust removal.

[0039] Example 3

[0040] This embodiment is based on the above-mentioned embodiment. In this embodiment, the spraying device 23 is provided with multiple groups of spraying robotic arms 231, each of the spraying robotic arms 231 is respectively provided with a six-axis manipulator, the six-axis manipulator is provided with a spray gun, and the movable support device 1 is provided with an adjustable tooling; wherein, the six-axis manipulator is used to adjust the angle of the spray gun through a multi-degree-of-freedom joint, and cooperates with the rotation of the adjustable tooling to perform full-surface spraying on the component to be processed.

[0041] In this embodiment, the multiple groups of spraying robotic arms 231 of the spraying device 23 can work in coordination with each other. The spray gun on the six-axis manipulator can flexibly adjust the angle under the drive of the multi-degree-of-freedom joint. At the same time, the adjustable tooling on the movable support device 1 drives the component to be processed to rotate, so that the spray gun can spray the surface of the component from different directions to achieve full surface coverage. The spraying device 23 solves the problem of the difficulty in fully covering the complex surfaces of components in existing spraying equipment through the flexible movement of the robotic arm and the rotation of the tooling, and ensures the uniformity and integrity of the paint spraying. During implementation, the flexibility of the manipulator joints needs to be checked regularly. At the same time, the system controls the rotation speed of the adjustable tooling to match the movement speed of the spray gun to avoid missed spraying or re-spraying. Attention should also be paid to keeping the spray gun clean to prevent paint clogging and affecting the spraying effect.

[0042] Example 4

[0043] This embodiment builds upon the previous embodiment. In this embodiment, drying device 24 includes a hot air circulation mechanism and an infrared heating mechanism. The hot air circulation mechanism uses an electric heating function to eject hot air, creating an internal circulation of hot air. The infrared heating mechanism uses infrared heating to assist in raising the temperature within drying device 24. When drying device 24 is operating, the hot air circulation mechanism generates hot air through the electric heating function. This hot air circulates within the device, uniformly raising the temperature around the component being processed. Simultaneously, the infrared heating mechanism activates, using infrared radiation to assist in raising the temperature within the device. These two heating methods work together to accelerate the curing of the sprayed paint. This device utilizes hot air circulation to ensure temperature uniformity, while infrared heating rapidly raises the temperature. Compared to existing devices that use a single heating method, this not only shortens drying time but also ensures effective paint drying. During implementation, the hot air circulation flow rate must be controlled to ensure a more uniform flow of hot air across all parts of the component. The infrared heating mechanism's power must be pre-set according to operating conditions to avoid improper coordination with the hot air circulation, which could lead to localized overheating and cracking or discoloration of the paint. Regular inspection of the heating element's operating status is also crucial to ensure consistent heating efficiency.

[0044] Example 5

[0045] This embodiment is based on the above-mentioned embodiment. In this embodiment, the gas collection equipment 3 includes a telescopic canopy 31, and the telescopic canopy 31 is arranged on the outside of the movable support equipment 1 and the paint drying equipment 2. The telescopic canopy 31 is connected to the exhaust gas recovery device 32, and the air inlet end of the exhaust gas recovery device 32 is connected to the interior of the telescopic canopy 31. An exhaust gas treatment device is arranged in the exhaust gas recovery device 32, and the exhaust gas outlet end of the exhaust gas recovery device 32 is connected to the exhaust pipe 33; wherein, the telescopic canopy 31 is used to adjust the length by telescoping to adapt to the size of the processed component, the exhaust gas recovery device 32 is used to collect the exhaust gas in the telescopic canopy 31 by generating negative pressure through a fan, and the exhaust gas treatment device is used to harmlessly treat the exhaust gas.

[0046] The telescopic canopy 31 of the gas collection equipment 3 can be adjusted to the size of the component being processed, thereby completely enclosing the paint drying equipment 2 and ensuring that the exhaust gas generated during the processing process is effectively collected within the canopy. The air inlet of the exhaust gas recovery device 32 is connected to the interior of the telescopic canopy 31. When its fan is in operation, it generates negative pressure. Under the action of negative pressure, the exhaust gas within the canopy is smoothly drawn into the exhaust gas recovery device 32. It is then harmlessly treated by the internal exhaust gas treatment device and finally discharged through the exhaust pipe 33 at the air outlet. This process, by utilizing the telescopic and adaptable adjustment of the telescopic canopy 31, solves the problem of insufficient exhaust gas collection range when processing components of different sizes, improves the adaptability of the equipment to components of different specifications, and expands the equipment's application range. The negative pressure collection method ensures that the exhaust gas will not spread arbitrarily, achieving centralized and efficient collection of the exhaust gas. This embodiment combines negative pressure collection with exhaust gas treatment, significantly reducing the possibility of exhaust gas leakage, reducing pollution to the surrounding environment, and improving the environmental friendliness of the equipment. During implementation, the telescopic part of the telescopic canopy 31 must ensure good sealing performance to avoid exhaust gas leakage due to gaps; the negative pressure intensity generated by the fan must match the volume of the canopy to ensure that all exhaust gas can be effectively sucked in; at the same time, check whether the connection between the exhaust gas recovery device 32 and the telescopic canopy 31 is tight to prevent air leakage at the connection from affecting the collection effect.

[0047] As a preferred embodiment, the exhaust gas treatment device includes an activated carbon adsorption unit and a catalytic combustion module connected in sequence, and the activated carbon adsorption unit and the catalytic combustion module are respectively connected to the air inlet and the air outlet of the exhaust gas recovery device 32; the activated carbon adsorption unit is used to absorb harmful gases in the exhaust gas, and the catalytic combustion module is used to catalytically combust the combustible gas in the exhaust gas. When the exhaust gas enters the exhaust gas treatment device, it first flows through the activated carbon adsorption unit, and the harmful gases in the exhaust gas are adsorbed and intercepted by the activated carbon. The exhaust gas after preliminary purification then enters the catalytic combustion module, and the combustible gas therein is catalytically burned and decomposed into harmless substances in the module. This embodiment uses a two-stage treatment process to first remove some harmful components through activated carbon adsorption, and then deeply treat the combustible gas through catalytic combustion, forming an efficient exhaust gas purification process. The combination of activated carbon adsorption and catalytic combustion significantly improves the exhaust gas purification efficiency, can effectively remove volatile organic waste gas, and ensure that the exhaust gas emissions meet the relevant standards; at the same time, the two-stage treatment has a clear division of labor, which not only utilizes the convenience of activated carbon adsorption, but also plays the advantage of thorough decomposition of catalytic combustion, thereby improving the stability of exhaust gas treatment. During implementation, the activated carbon in the activated carbon adsorption unit needs to be replaced regularly to avoid a decrease in the treatment effect after adsorption saturation; the catalytic combustion module needs to control the reaction temperature to ensure sufficient combustion of the combustible gas, while preventing damage to the equipment caused by excessive temperature; in long-term use of equipment, the connecting pipes between components need to be checked regularly to ensure good sealing and avoid direct discharge of untreated exhaust gas.

[0048] Example 6

[0049] This embodiment builds upon the previous embodiment. In this embodiment, a passage opening is provided at one end of the gas collection device 3 for accommodating the components to be processed. An air curtain 34 is installed above the passage opening on the gas collection device 3. This air curtain 34 is designed to form a curtain of air by jetting air to prevent internal gas from escaping. When the components to be processed enter through the passage opening of the gas collection device 3, the air curtain 34 above the passage opening is activated, continuously jetting air to form a curtain of air. This curtain of air effectively prevents exhaust gas from escaping from the canopy through the passage opening while not affecting the normal entry and exit of the components. The provision of air curtain 34 compensates for the insufficient sealing of the telescopic canopy 31 at the passage opening, further improving the exhaust gas collection rate and reducing pollution to the surrounding environment. During implementation, the jet intensity of air curtain 34 must be adjusted according to the size of the passage opening to ensure that the air curtain completely covers the opening. The jet direction of the air curtain must also be coordinated with the direction of the negative pressure within the canopy to prevent the air curtain from being blown away by the negative pressure, affecting its blocking effect. The air outlet of air curtain 34 must also be cleaned regularly to prevent impurities from clogging the air curtain and causing unevenness.

[0050] Example 7

[0051] This embodiment is based on the above-mentioned embodiment. In this embodiment, the movable support device 1 includes multiple sets of movable tire frames 11. The top of the movable tire frame 11 is provided with an I-shaped bracket 111 for supporting the component to be processed, and the bottom of the movable tire frame 11 is provided with a tire frame base 112 connected to the I-shaped bracket 111. During operation, the multiple sets of movable tire frames 11 of the movable support device 1 are disassembled or installed according to the size of the component to be processed. The I-shaped bracket 111 at the top of the tire frame directly contacts the component to provide support force, and the tire frame base 112 connects the bracket to the ground to ensure stable support. This structure adapts to components of different sizes through the modular combination of movable tire frames 11. During implementation, the appropriate number of movable tire frames 11 needs to be selected according to the weight of the component to ensure that the supporting force is evenly distributed. Buffer pads can be added to the contact area between the I-shaped bracket 111 and the component to prevent damage to the component surface.

[0052] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A paint spraying and drying system for steel structures, characterized in that: It includes a movable support device, a paint spray drying device and a gas collection device, wherein the movable support device is arranged at the bottom of the paint spray drying device, and the gas collection device cover is arranged outside the movable support device and the paint spray drying device; The paint spray drying equipment is connected to a walking device at the bottom, and the paint spray drying equipment includes a laser rust removal device, a spraying device and a drying device arranged in sequence in a horizontal direction. The laser rust removal device is arranged at the inlet end of the paint spray drying equipment, and the drying device is arranged at the outlet end of the paint spray drying equipment. The laser rust removal device, the spraying device and the drying device are all connected to a linkage control box; The laser rust removal device, spraying device and drying device are used to act on the component to be processed on the bottom movable support device in sequence for processing; the movable support device is used to adapt to the size of the component to be processed and provide supporting force through disassembly and installation; the gas collection device is used to collect and transport the exhaust gas generated during the processing.

2. A paint spraying and drying system for steel structures according to claim 1, characterized in that: The laser rust removal device is respectively provided with a pulse fiber laser and a visual positioning system. The visual positioning system is used to identify the rusted area through visual camera scanning and send a signal to the laser rust removal device, so that the laser rust removal device adjusts the scanning trajectory according to the signal.

3. The paint spraying and drying system for steel structures according to claim 1, characterized in that: The spraying device is provided with multiple groups of spraying mechanical arms, each of the spraying mechanical arms is provided with a six-axis manipulator, each of the six-axis manipulators is provided with a spray gun, and the movable support device is provided with an adjustable tooling; The six-axis manipulator is used to adjust the angle of the spray gun through multi-degree-of-freedom joints, and to spray the entire surface of the component to be processed in conjunction with the rotation of the adjustable tooling.

4. The paint spraying and drying system for steel structures according to claim 1, characterized in that: The drying device includes a hot air circulation mechanism and an infrared heating mechanism. The hot air circulation mechanism is used to spray hot air through an electric heating function to form an internal circulating hot air, and the infrared heating mechanism is used to assist in raising the temperature inside the drying device through infrared heating.

5. The paint spraying and drying system for steel structures according to claim 1, characterized in that: The gas collection equipment includes a telescopic canopy, which is arranged outside the movable support equipment and the paint spray drying equipment. The telescopic canopy is connected to an exhaust gas recovery device, the air inlet end of the exhaust gas recovery device is connected to the interior of the telescopic canopy, the exhaust gas treatment device is provided in the exhaust gas recovery device, and the air outlet end of the exhaust gas recovery device is connected to an exhaust pipe; Among them, the telescopic canopy is used to adjust the length by telescoping to adapt to the size of the processed components, the exhaust gas recovery device is used to collect the exhaust gas in the telescopic canopy by generating negative pressure through the fan, and the exhaust gas treatment device is used to harmlessly treat the exhaust gas.

6. A paint spraying and drying system for steel structures according to claim 5, characterized in that: The exhaust gas treatment device comprises an activated carbon adsorption unit and a catalytic combustion module connected in sequence, wherein the activated carbon adsorption unit and the catalytic combustion module are respectively connected to the air inlet and the air outlet of the exhaust gas recovery device; The activated carbon adsorption unit is used to absorb harmful gases in the exhaust gas, and the catalytic combustion module is used to perform catalytic combustion treatment on the combustible gases in the exhaust gas.

7. The paint spraying and drying system for steel structures according to claim 1, characterized in that: A passage opening is provided at one end of the gas collecting device for accommodating the entry of components to be processed, and an air curtain machine is provided on the gas collecting device above the passage opening. The air curtain machine is used to form an air curtain by jetting air to prevent internal gas from overflowing.

8. The paint spraying and drying system for steel structures according to claim 1, characterized in that: The movable support device includes multiple groups of movable tire frames, the top of the movable tire frame is provided with an I-shaped bracket for supporting the component to be processed, and the bottom of the movable tire frame is provided with a tire frame base connected to the I-shaped bracket.

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