Slit coating processing equipment and spraying method

Abstract

The slit coating machining equipment comprises a machining rack, a drying box body and an XY-axis displacement platform, the drying box body and the XY-axis displacement platform are both connected with the machining rack through bolts, a belt type conveying mechanism is assembled in an inner cavity of the drying box body, a pump body is assembled at the output end of the XY-axis displacement platform, and the drying box body is connected with the XY-axis displacement platform through bolts. And the discharge hole of the nozzle is communicated with the nozzle. According to the slit coating processing equipment and the spraying method, coating particles possibly falling from the upper portion can be borne in cooperation with the design of an anti-dripping plate, drying equipment is prevented from being polluted, the maintenance period is prolonged, the surface energy of a base material is enhanced by constructing a micro-nano structure through the nano-imprinting technology introduced in the pretreatment stage, the mechanical anchoring effect is formed between a coating and a substrate, and the coating quality is improved. The pretreatment quality can be accurately controlled through real-time wettability detection, the uniformity of the adhesion force of a subsequent coating layer is ensured, the cracking or wrinkle defect caused by rapid curing is avoided, the continuous operation characteristic of the belt type conveying mechanism allows synchronous curing of batch workpieces, and the productivity scale is improved.

Description

Technical Field

[0001] The present invention relates to the field of slit coating processing, in particular to a slit coating processing device and a spraying method. Background Art

[0002] The field of slit coating equipment and spraying methods primarily involves the integration of precision coating processes and automated production technologies. This type of equipment is typically used to form a uniform coating on substrate surfaces and is widely used in industrial applications requiring stringent coating quality, such as electronic component manufacturing, optical thin film processing, and new energy material production. Its core technologies encompass coating head structural design, transmission mechanism optimization, and multi-process coordinated control, balancing coating uniformity, production efficiency, and process stability.

[0003] Traditional slit coating equipment generally has the problem of low thermal energy utilization in the drying process. The open drying structure causes a large amount of heat loss. At the same time, the overflow of volatile solvents not only causes waste of raw materials, but also may cause safety hazards. During the coating process, paint particles that are not fully cured are easily affected by airflow disturbances and fall off. Existing equipment lacks effective protection measures. Falling residues can easily contaminate heating elements and increase the frequency of equipment shutdown and cleaning. In terms of process connection, traditional equipment mostly adopts an intermittent operation mode. The workpiece needs to wait until the previous process is completely completed before entering the next link, resulting in an idle period in the drying and spraying processes. It is difficult to break through the bottleneck of the comprehensive utilization rate of equipment. In addition, the conventional pretreatment process lacks the accuracy of controlling the surface energy of the substrate. The bonding strength between the coating and the substrate is easily affected by the micromorphology of the substrate. The curing method of a single temperature curve often leads to coating defects due to internal stress concentration. The expansion of production capacity in mass production is limited by the efficiency of single machine operation. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present application provides a slit coating processing equipment and a spraying method to solve the technical problems that the conventional pretreatment process mentioned above has insufficient control accuracy of the surface energy of the substrate, the bonding strength between the coating and the substrate is easily affected by the micromorphology of the substrate, and the curing method of a single temperature curve often causes coating defects due to internal stress concentration, and the capacity expansion in mass production is limited by the efficiency of the single machine operation.

[0005] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a slit coating processing equipment, comprising a processing frame, a drying box body and an XY-axis displacement platform, the drying box body and the XY-axis displacement platform are both connected to the processing frame by bolts, the inner cavity of the drying box body is equipped with a belt transmission mechanism, the output end of the XY-axis displacement platform is equipped with a pump body, the discharge port of the nozzle is connected to the nozzle, and a pneumatic valve is provided on the outside of the nozzle, and there are at least two groups of pump bodies, which are distributed on the left and right sides of the bottom of the output end of the XY-axis displacement platform.

[0006] A drying device is provided at the bottom of the inner cavity of the drying box body, and limit brackets are connected to both sides of the drying box body. The inner cavity of the limit bracket is equipped with a cylinder, and the output end of the cylinder is externally connected to a sealing long plate, and the sealing long plate is inserted on the left and right sides of the outside of the drying box body. A paint dripping prevention plate is inserted on the front of the drying box body, and the paint dripping prevention plate covers directly above the drying device.

[0007] Preferably, a control module is provided on the front of the XY-axis displacement platform through bolts, and the control module is connected to the drying equipment, pump body, belt transmission mechanism and cylinder through lines, and a display module is provided on the front of the XY-axis displacement platform. The display module adopts a 7-inch touch screen, which can display the spray thickness curve, drying temperature curve and equipment operation status parameters in real time, and supports data export function to facilitate quality traceability.

[0008] Preferably, a laser interferometer is provided at the bottom of the XY-axis displacement platform, and a transparent protective shell is provided on the outside of the output end of the laser interferometer. The transparent protective shell is made of quartz glass, and a nitrogen purge interface is provided on its inner wall to prevent the volatile solvent from condensing on the mirror surface during the coating process and affecting the measurement accuracy.

[0009] Preferably, the inner cavity of the drying box body is provided with a load-bearing base through bolts, the top of the load-bearing base is in contact with the top of the inner cavity of the belt transmission mechanism, and a shock-absorbing spring group is provided inside the load-bearing base, which can effectively absorb the vibration generated by the operation of the belt transmission mechanism, ensuring that the position accuracy of the workpiece during the spraying process is ≤±0.05mm.

[0010] Preferably, electric clamps are evenly arranged on the outside of the belt transmission mechanism, and the outside of the chuck of the electric clamp is sleeved with a rubber protective cover, and the surface of the rubber protective cover is provided with an anti-slip texture, and its Shore hardness is 60A, which can ensure the clamping stability and avoid causing indentations on the workpiece surface.

[0011] Preferably, a sealing protective sleeve is sleeved on the outside of the sealing long plate, and fixing grooves are provided on the left and right sides of the drying box body. The sealing protective sleeve is embedded in the inner cavity of the fixing groove. The sealing protective sleeve is made of EPDM rubber, and a double sealing flange structure is provided at its lip portion, which always maintains an interference fit with the wall of the fixing groove within the range of the cylinder stroke.

[0012] Preferably, a rubber block is provided on the outside of the cylinder, and the outside of the rubber block is in contact with the outside of the belt transmission mechanism. The rubber block is made of conductive silicone material, which can effectively conduct static electricity while providing buffering protection, preventing static electricity accumulation during coating from causing paint splashing.

[0013] A slit coating spraying method, based on the above-mentioned slit coating processing equipment, comprises: S1. Substrate pretreatment: The workpiece is cleaned and the surface wettability is tested by a contact angle meter after cleaning. The workpiece uses nanoimprint technology to form a periodic concave-convex structure on the surface. The nanoimprint process parameters are set to a pressure of 5 MPa and a temperature of 120°C. The depth of the concave-convex structure formed is 200 nm, which can significantly improve the wettability of the coating and reduce the contact angle from 85° to 35°.

[0014] S2, single-sided coating: The workpiece is placed on top of the belt conveyor mechanism and fixed. The external paint is connected to two sets of pump bodies. The pump body sprays the outside of the workpiece through the nozzle. A pulse feeding mode is adopted during the spraying process. The pulse frequency is linked to the movement speed of the XY-axis displacement platform to achieve dynamic adjustment of the coating thickness.

[0015] S3, flip coating: Start the belt transmission mechanism to drive the workpiece on the top to move to the bottom of the inner cavity of the drying box, and start the drying equipment to dry the workpiece. At this time, the pump body is spraying the workpiece on the top of the belt transmission mechanism. The drying equipment adopts infrared and hot air composite heating method. The infrared wavelength matches the absorption peak of the paint, and the hot air speed of 3m / s increases the solvent volatilization rate by 40%.

[0016] S4, final curing: The belt transmission mechanism is started to drive the two groups of workpieces to move. The workpieces are cyclically heated and cured through the drying equipment. The cyclic heating curve is set to a gradient temperature increase of 80℃ / 10min→120℃ / 5min→150℃ / 3min. The reciprocating motion of the workpiece is combined to achieve uniform curing. The coating hardness after curing can reach 3H.

[0017] Preferably, in the S1, substrate pretreatment, an atmospheric plasma cleaning machine is used, using a mixed gas of argon and oxygen to remove organic pollutants and particles on the surface of the workpiece, and the roughness of the workpiece is detected by atomic force microscopy. The plasma cleaning power is set to 300W and the processing time is 90s, which can reduce the surface roughness Ra value from 1.2μm to 0.3μm, significantly improving the coating adhesion.

[0018] Preferably, in the S4, final curing, after the workpiece is heated and dried by the drying equipment, it is cooled by air cooling and is left to stand for 10 to 20 minutes before unloading. The air cooling system adopts vortex tube refrigeration technology, which can provide -20°C low-temperature airflow, combined with a 15-minute standing process, so that the stress release rate in the coating reaches more than 85%, effectively preventing cracking.

[0019] In summary, the present application provides a slit coating processing equipment and a spraying method, which have the following beneficial effects: The slit coating processing equipment and spraying method, the drying box body integrated sealing structure realizes dynamic opening and closing through the long sealing plate driven by the cylinder, forming a relatively closed space during the drying stage, which not only reduces heat energy loss but also prevents the overflow of volatile substances. The anti-drip plate design can absorb paint particles that may fall from above, avoid contamination of the drying equipment and extend the maintenance cycle.

[0020] This slot coating process equipment and spraying method utilizes a belt conveyor mechanism and a flipping process to automatically switch workpiece positions during the spraying, drying, and curing process. While the first piece is drying, the next piece can be sprayed simultaneously. This streamlined operation maximizes equipment utilization to its theoretical maximum. Nanoimprint technology, introduced during the pretreatment stage, enhances the substrate's surface energy by constructing micro-nanostructures, creating a mechanical anchoring effect between the coating and the substrate. Combined with real-time wettability testing, this technology precisely controls pretreatment quality and ensures uniform adhesion of subsequent coating layers.

[0021] The slit coating processing equipment and spraying method adopt a cyclic heating method to make the workpiece pass through the drying zone multiple times, and achieve balanced stress release in the coating through progressive temperature control, avoiding cracking or wrinkling defects caused by rapid curing. At the same time, the continuous operation characteristics of the belt transmission mechanism allow batches of workpieces to be cured synchronously, thereby improving production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front schematic diagram of the present invention.

[0023] Figure 2 It is a plan view of the present invention.

[0024] Figure 3 It is an external schematic diagram of the XY axis displacement platform of the present invention.

[0025] Figure 4 It is a partial cross-sectional view of the drying box body of the present invention.

[0026] Figure 5 It is a flow chart of the method of the present invention.

[0027] Description of reference numerals: 1. Processing frame; 2. Drying box body; 3. Limit bracket; 31. Cylinder; 32. Sealing long plate; 33. Sealing protective cover; 4. Belt transmission mechanism; 41. Electric clamp; 42. Load-bearing base; 5. Drying equipment; 51. Anti-paint dripping plate; 6. XY-axis displacement platform; 61. Control module; 62. Pump body; 63. Nozzle; 64. Laser interferometer. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] This application provides a technical solution, please refer to Figure 1 、 Figure 2 and Figure 3 A slit coating processing equipment includes a processing frame 1, a drying box body 2 and an XY-axis displacement platform 6. The drying box body 2 and the XY-axis displacement platform 6 are connected to the processing frame 1 by bolts. The drying box body 2 adopts a double-layer insulation structure design, and the inner and outer layers are filled with a composite material of aerogel felt and vacuum insulation board. The actual measurement by a thermal imager can make the surface temperature of the box body ≤45°C, significantly reducing the impact of heat radiation on peripheral equipment; a temperature sensor array is provided on the wall of its inner cavity, which can monitor the temperature distribution of the drying area in real time and feed back to the control module 61, and realize closed-loop control of the drying temperature through the PID algorithm; the PID algorithm adopts an anti-integral saturation design, and automatically switches to the Bang-Bang control mode when the temperature overshoot exceeds the set value by 5%, ensuring that the temperature fluctuation range is ≤±2°C.

[0030] The output end of the XY-axis displacement platform 6 is equipped with a pump body 62, the discharge port of the nozzle 63 is connected to the nozzle 63, and a pneumatic valve is provided on the outside of the nozzle 63. There are at least two groups of pump bodies 62, which are distributed on the left and right sides of the bottom of the output end of the XY-axis displacement platform 6; the two groups of pump bodies 62 adopt an alternating working mode, a fast switching mechanism with a single spraying operation interval of ≤0.3s, and cooperate with the spiral spoiler column provided in the bypass circulation pipeline to maintain the shear rate of the paint ≥1500s⁻¹, effectively inhibiting the sedimentation of fillers such as titanium dioxide; when the pump body 62 on one side is performing a spraying operation, the pump body 62 on the other side maintains the fluidity of the paint through the bypass circulation, effectively preventing the precipitation and clogging of high-viscosity paint.

[0031] Please refer to Figure 4 A drying device 5 is provided at the bottom of the inner cavity of the drying box body 2. Both sides of the drying box body 2 are connected to a limit bracket 3. The inner cavity of the limit bracket 3 is equipped with a cylinder 31. The output end of the cylinder 31 is externally connected to a sealing long plate 32. The sealing long plate 32 is inserted on the left and right sides of the outside of the drying box body 2. The sealing long plate 32 is made of high-temperature resistant silicone material, and a microporous breathable structure is provided on its surface. The micropore diameter is gradiently distributed. The diameter close to the inner side of the box body is 50μm, and the outer diameter shrinks to 20μm. The air permeability can reach 8L / min·cm² under an air pressure difference of 0.5MPa, and it can also block paint splashing particles with a diameter of ≥0.1mm; while ensuring the sealing of the box body, the internal and external air pressure can be balanced.

[0032] A paint-preventing dripping plate 51 is inserted on the front of the drying box body 2, and the paint-preventing dripping plate 51 covers the top of the drying equipment 5. The surface of the paint-preventing dripping plate 51 is coated with Teflon coating, and its inclination angle is designed to be 15°. This angle is optimized by fluid simulation and combined with mirror treatment with a surface roughness of Ra≤0.2μm to make the paint contact angle ≥110°, ensuring that the dripping paint flows back to the collection tank along the predetermined trajectory to avoid contaminating the surface of the drying equipment 5.

[0033] A control module 61 is provided on the front of the XY-axis displacement platform 6 by bolts. The control module 61 is connected to the drying equipment 5, the pump body 62, the belt transmission mechanism 4 and the cylinder 31 through lines. In addition, a display module is provided on the front of the XY-axis displacement platform 6. The display module adopts a 7-inch touch screen. The screen surface is covered with AG anti-glare glass. It can still maintain touch sensitivity in an environment with 85% humidity. It supports CSV / Excel format data export. The data contains 12 key parameters such as timestamp, device coordinates, temperature value, etc., which meets ISO9001 quality traceability requirements.

[0034] A laser interferometer 64 is provided at the bottom of the XY-axis displacement platform 6. A transparent protective shell is provided on the outside of the output end of the laser interferometer 64. The transparent protective shell is made of quartz glass, and a nitrogen purge interface is provided on its inner wall. The nitrogen flow rate is maintained at a constant flow rate of 2L / min through PID control. In conjunction with the condensation water guide groove provided at the bottom of the shell, the mirror temperature fluctuation is made ≤±0.5°C to prevent the volatile solvent from condensing on the mirror during the coating process and affecting the measurement accuracy.

[0035] The inner cavity of the drying box body 2 is provided with a load-bearing base 42 through bolts. The top of the load-bearing base 42 is in contact with the top of the inner cavity of the belt transmission mechanism 4. A shock-absorbing spring group is provided inside the load-bearing base 42. The spring is made of INCONEL X-750 alloy. After 100,000 fatigue tests, the stiffness attenuation is ≤5%. Combined with the hydraulic damper, a three-order shock absorption system is formed, which makes the vibration attenuation rate in the 100Hz frequency band reach 92%, which can effectively absorb the vibration generated by the operation of the belt transmission mechanism 4 and ensure that the position accuracy of the workpiece during the spraying process is ≤±0.05mm.

[0036] Electric clamps 41 are evenly arranged on the outside of the belt transmission mechanism 4. The outside of the clamp of the electric clamp 41 is covered with a rubber protective cover. The surface of the rubber protective cover is provided with an anti-slip texture. Its Shore hardness is 60A. The hardness value has been optimized by finite element analysis. The contact stress is ≤0.8MPa under a clamping force of 3MPa, which can not only ensure the clamping stability but also avoid indentation on the workpiece surface.

[0037] The outside of the sealing long plate 32 is sleeved with a sealing protective sleeve 33. Fixed grooves are provided on the left and right sides of the drying box body 2. The sealing protective sleeve 33 is embedded in the inner cavity of the fixed groove. The sealing protective sleeve 33 is made of EPDM rubber, and a double sealing flange structure is provided at its lip. The distance between the double flanges forms an interference fit of 1:1.05 with the width of the fixed groove. The sealing force decays ≤15% within the temperature range of -20℃ to 150℃, and the interference fit with the wall of the fixed groove is always maintained within the stroke range of the cylinder 31.

[0038] The outside of the cylinder 31 is provided with a rubber block, and the outside of the rubber block is in contact with the outside of the belt transmission mechanism 4. The rubber block is made of conductive silicone material with a volume resistivity of ≤10 4 Ω·cm, combined with the grounding wire design, the static half-life can be reduced to ≤0.1s. It can provide buffer protection while effectively conducting away static electricity, preventing static accumulation during the coating process from causing paint splashing.

[0039] Please refer to Figure 5 A slit coating spraying method, based on the above-mentioned slit coating processing equipment, comprises: S1. Substrate pretreatment: The workpiece was cleaned and the surface wettability was tested by a contact angle meter after cleaning. Nanoimprint technology was used to form a periodic concave-convex structure on the surface of the workpiece. The nanoimprint process parameters were set to a pressure of 5 MPa and a temperature of 120°C. The depth of the concave-convex structure formed was 200 nm. This structure caused a capillary effect on the contact line of the coating, and the contact angle hysteresis was reduced from 40° to 15°, which significantly improved the wettability of the coating and reduced the contact angle from 85° to 35°.

[0040] S2, single-sided coating: The workpiece is placed on the top of the belt transmission mechanism 4 and fixed. The external paint is connected to the two sets of pump bodies 62. The pump body 62 sprays the outside of the workpiece through the nozzle 63. A pulse feeding mode is adopted during the spraying process. The pulse duty cycle and the moving speed of the XY-axis displacement platform 6 are dynamically matched through a lookup table method. At a speed of 100 mm / s, a coating thickness control accuracy of ±5 μm can be achieved, realizing dynamic adjustment of the coating thickness.

[0041] S3, flip coating: Start the belt transmission mechanism 4 to drive the workpiece on the top to move to the bottom of the inner cavity of the drying box body 2, and start the drying equipment 5 to dry the workpiece. At this time, the pump body 62 is spraying the workpiece on the top of the belt transmission mechanism 4. The drying equipment 5 adopts infrared and hot air composite heating. The wavelength of the infrared lamp tube is set to 3.5μm, which matches the absorption peak of the COC group in the coating. Combined with the hot air speed of 3m / s, convection-radiation composite heat transfer is formed, which increases the solvent volatilization rate by 40%.

[0042] S4, final curing: The belt transmission mechanism 4 is started to drive the two groups of workpieces to move, and the workpieces are cyclically heated and cured through the drying equipment 5. The cyclic heating curve is set to a gradient temperature increase of 80℃ / 10min→120℃ / 5min→150℃ / 3min. Each stage corresponds to the solvent volatilization, resin cross-linking and post-curing process, respectively. Uniform curing is achieved with the reciprocating motion of the workpiece. The hardness of the coating after curing can reach 3H according to the pencil hardness test method.

[0043] S1. During substrate pretreatment, an atmospheric plasma cleaning machine is used, using a mixture of argon and oxygen to remove organic pollutants and particles on the workpiece surface. The plasma electron density reaches the order of 10¹¹ / cm³, and the removal efficiency of 0.1μm particles is ≥99.5%. The roughness of the workpiece is tested by atomic force microscopy. The plasma cleaning power is set to 300W and the processing time is 90s. The surface roughness Ra value can be reduced from 1.2μm to 0.3μm, significantly improving the adhesion of the coating.

[0044] S4. During the final curing, after the workpiece is heated and dried by the drying equipment 5, it is cooled by air cooling. The air duct adopts a Venturi tube structure, which can generate a low-temperature airflow of -20°C when driven by 0.3MPa compressed air. It is left to stand for 10 to 20 minutes before unloading. The standing process allows the coating molecular segments to complete stress relaxation. The residual vibration amplitude is detected by the laser Doppler vibrometer and decays to less than 5% of the initial value. The air cooling system adopts vortex tube refrigeration technology, which can provide a low-temperature airflow of -20°C. Combined with the 15-minute standing process, the stress release rate in the coating reaches more than 85%, effectively preventing cracking.

[0045] A slit coating process consists of a processing frame 1, a drying box 2, and an XY-axis displacement platform 6, forming the basic framework. These components are rigidly connected by bolts. Upon startup, the XY-axis displacement platform 6 undergoes initial calibration. A laser interferometer 64 at its base emits a laser beam to measure the platform's displacement accuracy. A transparent protective housing protects the optical components from coating contamination. A control module 61 simultaneously receives sensor data and establishes a three-dimensional coordinate system using a built-in algorithm, providing a spatial positioning reference for subsequent coating operations.

[0046] The belt conveyor 4 begins operation, supported by the load-bearing base 42. The electric clamp 41 clamps the workpiece with a rubber protective sleeve. The rubber material prevents the metal clamp from damaging the workpiece surface. When the workpiece is transported to the coating station, the two pump bodies 62 are activated synchronously. The left pump body 62 draws paint and transports it to the nozzle 63 through a pipeline. The right pump body 62 creates a negative pressure environment to prevent paint backflow. The pneumatic valve installed at the discharge port of the nozzle 63 is electromagnetically controlled to achieve pulsed opening and closing. In conjunction with the precise movement of the XY-axis displacement platform 6, a uniform slit-shaped coating is formed on the surface of the workpiece. The display module displays key data such as pump pressure parameters and the movement trajectory of the nozzle 63 in real time.

[0047] After single-sided coating is complete, the belt conveyor 4 transports the workpiece into the interior of the drying box 2. At this point, the cylinder 31 pushes the sealing plates 32 into the fixed grooves on either side of the drying box 2. The sealing sleeves 33 form an airtight seal with the box walls, preventing heat loss. When the drying device 5 is activated, the paint dripping plate 51 physically blocks direct contact between the paint and the heating element. Its Teflon coating provides high-temperature resistance and anti-adhesion properties. During the drying process, the belt conveyor 4 continues to operate at a low speed to ensure uniform heating of the coating.

[0048] During the flip coating phase, the electric clamp 41 rotates 180° under program control. The rubber protective sleeve cushions the clamping force by deforming, preventing workpiece deformation. Meanwhile, the XY-axis displacement platform 6 drives another set of pumps 62 to coat the reverse side of the workpiece. The dual-station design allows for simultaneous drying of the front side and coating of the reverse side. A laser interferometer 64 continuously monitors the platform's displacement accuracy. If a Z-axis deviation exceeding 0.01mm is detected, the control module 61 automatically adjusts the pressure of the pumps 62 to compensate for the height difference.

[0049] During the final curing stage, the belt conveyor 4 transports the double-sided coated workpiece back into the drying box 2. The drying equipment 5 employs a segmented temperature control strategy: an initial temperature of 80°C for rapid solvent evaporation, a mid-range temperature of 120°C for enhanced coating leveling, and a final temperature of 150°C for complete crosslinking. During this process, the anti-drip plate 51 continuously intercepts any coating debris that may fall off. The load-bearing base 42 uses a vibration sensor to monitor the workpiece's transport status. When the vibration frequency exceeds a set threshold, the control module 61 reduces the transport speed.

[0050] Control module 61, the core processing unit, communicates with each actuator via the CAN bus. During substrate pretreatment, its built-in program controls the output power of the atmospheric plasma cleaner, precisely controlling the argon-to-oxygen ratio at a 3:1 ratio. The plasma is excited by an RF power supply. A contact angle meter provides real-time feedback on surface wettability, automatically stopping cleaning when the contact angle falls below 10°. During the nanoimprint process, control module 61 simultaneously adjusts the pressure and temperature of the imprint head to create a concave-convex structure with a period of 500 nm on the workpiece surface.

[0051] The XY-axis displacement platform 6 utilizes a PID algorithm for motion control. The laser interferometer 64 collects 1000 sets of position data per second, using a Kalman filter to eliminate mechanical vibration interference. During spraying, the platform moves at a constant speed of 0.5 m / min along the X-axis, while pulse stepping is used to achieve fine adjustments of ±0.005 mm along the Y-axis. If the pump 62 detects a pressure fluctuation exceeding 5%, the system automatically pauses coating and initiates a self-test.

[0052] The electric clamp 41 of the belt transmission mechanism 4 utilizes closed-loop control, with a torque sensor monitoring the clamping force in real time. The compression of the rubber sleeve is linearly related to the clamping force. During the flipping process, the clamp rotation speed is synchronously controlled using encoder feedback. When the angle difference between the two clamps exceeds 0.5°, the control module 61 activates a compensation mechanism. A pressure sensor built into the load-bearing base 42 detects changes in workpiece weight and triggers a material shortage alarm if the weight decreases by more than 10%.

[0053] The drying equipment 5 utilizes a fuzzy PID algorithm for temperature control. An infrared thermometer monitors the workpiece surface temperature in real time, and the heating power is adjustable in 10 levels. The paint dripping prevention plate 51 automatically raises and lowers via a servo motor. When the coating thickness exceeds a set value, the plate lowers 5mm to increase the space for hot air circulation. The sealing plate 32 of the cylinder 31 utilizes a dual-stroke design, creating a slightly negative pressure environment in its initial position. Once fully inserted, the pressure reaches -50 Pa, effectively preventing the escape of volatile gases.

[0054] During the final curing stage, the air cooling system works in conjunction with the drying equipment 5. When the workpiece temperature drops to 80°C, the centrifugal fan starts, with the wind speed controlled by a frequency converter within a range of 2-5 m / s. During the resting process, the control module 61 automatically calculates the rest time based on the coating thickness. For every 10 μm increase in thickness, the rest time is extended by 2 minutes. The display module simultaneously displays the curing curve. If the actual curve deviates from the theoretical curve by more than 3%, the system automatically adjusts the drying parameters.

[0055] The equipment's safety system employs a three-level protection mechanism: Level 1 utilizes laser interferometer 64 to limit motion, Level 2 utilizes a vibration sensor on the load-bearing base 42 to trigger an emergency stop, and Level 3 utilizes mechanical position limiting provided by the rubber block in cylinder 31. In the event of a power outage, a backup power source can maintain the sealing plate 32 closed for 30 minutes to prevent the leakage of hazardous gases.

[0056] The entire process is fully automated through the control module 61, with all process parameters stored in real time in a local database. Operators can access historical data through the display module to generate visual reports such as coating thickness distribution and temperature curves. Equipment maintenance intervals are automatically prompted based on operating time. Key components such as the pump 62 and cylinder 31 are equipped with a life prediction function, initiating an early warning program when the remaining life falls below 20%.

[0057] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0058] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A slit coating processing equipment, comprising a processing frame (1), a drying box body (2) and an XY axis displacement platform (6), wherein the drying box body (2) and the XY axis displacement platform (6) are connected to the processing frame (1) by bolts, characterized in that: The inner cavity of the drying box body (2) is equipped with a belt transmission mechanism (4), the output end of the XY axis displacement platform (6) is equipped with a pump body (62), the discharge port of the nozzle (63) is connected to the nozzle (63), and a pneumatic valve is provided on the outside of the nozzle (63), and the pump body (62) has at least two groups, which are distributed on the left and right sides of the bottom of the output end of the XY axis displacement platform (6); A drying device (5) is provided at the bottom of the inner cavity of the drying box body (2), and both sides of the drying box body (2) are connected to limit brackets (3). The inner cavity of the limit bracket (3) is equipped with a cylinder (31), and the output end of the cylinder (31) is externally connected to a sealing long plate (32). The sealing long plate (32) is inserted on the left and right sides of the outside of the drying box body (2), and a paint dripping prevention plate (51) is inserted on the front of the drying box body (2), and the paint dripping prevention plate (51) covers directly above the drying device (5).

2. A green building fireproof steel structure according to claim 1, characterized in that: A control module (61) is provided on the front of the XY-axis displacement platform (6) via bolts. The control module (61) is connected to the drying device (5), the pump body (62), the belt transmission mechanism (4) and the cylinder (31) via lines. A display module is also provided on the front of the XY-axis displacement platform (6).

3. The green building fireproof steel structure according to claim 1, characterized in that: A laser interferometer (64) is provided at the bottom of the XY-axis displacement platform (6), and a transparent protective shell is provided outside the output end of the laser interferometer (64).

4. The green building fireproof steel structure according to claim 1, characterized in that: The inner cavity of the drying box body (2) is provided with a load-bearing base (42) via bolts, and the top of the load-bearing base (42) contacts the top of the inner cavity of the belt transmission mechanism (4).

5. The green building fireproof steel structure according to claim 1, characterized in that: Electric clamps (41) are evenly arranged on the outside of the belt transmission mechanism (4), and the outside of the clamping head of the electric clamp (41) is sleeved with a rubber protective sleeve.

6. The green building fireproof steel structure according to claim 1, characterized in that: The outer portion of the sealing long plate (32) is sleeved with a sealing protective sleeve (33), and the left and right sides of the drying box body (2) are both provided with fixing grooves, and the sealing protective sleeve (33) is embedded in the inner cavity of the fixing groove.

7. The green building fireproof steel structure according to claim 1, characterized in that: A rubber block is provided on the outside of the cylinder (31), and the outside of the rubber block is in contact with the outside of the belt transmission mechanism (4).

8. A slit coating spraying method, based on the slit coating processing equipment according to any one of claims 1 to 7, characterized in that: include: S1. Substrate pretreatment: The workpiece is cleaned and the surface wettability is tested by a contact angle meter after cleaning. A periodic concave-convex structure is formed on the surface of the workpiece using nanoimprint technology; S2, single-sided coating: The workpiece is placed on the top of the belt transmission mechanism (4) and fixed, and the external coating is connected to the two sets of pump bodies (62), and the pump bodies (62) spray the outside of the workpiece through the nozzles (63); S3, flip coating: The belt conveyor (4) is started to drive the workpiece on the top to move to the bottom of the inner cavity of the drying box (2), and the drying device (5) is started to dry the workpiece. At this time, the pump body (62) sprays the workpiece on the top of the belt conveyor (4); S4, final curing: The belt transmission mechanism (4) is started to drive the two groups of workpieces to move, and the workpieces are cyclically heated and solidified through the drying equipment (5).

9. The slit coating spraying method according to claim 8, characterized in that: In the above-mentioned S1, substrate pretreatment, an atmospheric plasma cleaning machine is used to remove organic pollutants and particles on the surface of the workpiece using a mixed gas of argon and oxygen, and the roughness of the workpiece is detected by an atomic force microscope.

10. The slit coating spraying method according to claim 8, characterized in that: In the final curing step S4, the workpiece is heated and dried by the drying device (5), then cooled by air cooling, and allowed to stand for 10 to 20 minutes before unloading.

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