Wave beam guardrail plate drying and curing method

Abstract

The invention discloses a method for drying and curing a corrugated beam guardrail plate. The method comprises the following six steps of pre-drying an old plate at 160 DEG C, automatically spraying plastic powder by static electricity and dehydrating, curing the corrugated beam guardrail plate, cooling, post-processing the corrugated beam guardrail plate and checking the quality. According to the method, after a series of steps of water washing, coating phosphating and cleaning are conducted on the old corrugated beam guardrail plate, pre-drying treatment is conducted, then electrostatic painting is conducted, and finally high-temperature powder drying and curing operation is conducted, so that water and solvents on the surface can be better removed in the renovating process of the old corrugated beam guardrail plate, and the renovating quality of the old corrugated beam guardrail plate is improved. After spraying, the solvent or water in the coating is completely volatilized, and the resin or other film-forming substances in the coating are subjected to cross-linking reaction to form a hard protective layer; therefore, the purpose of more uniform coating is achieved, and the service life of the renovated corrugated beam guardrail plate is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of corrugated beam guardrail plates, and in particular to a method for drying and curing corrugated beam guardrail plates. Background Art

[0002] With the rapid development of my country's economy and society, my country's highways are also developing rapidly. The former highways are undergoing reconstruction and expansion, and many old corrugated beam guardrails will be eliminated. Scrapping them will lead to a waste of resources, bring major safety hazards to driving safety, and also affect the appearance; The traditional natural drying or inefficient drying methods have low renovation efficiency and poor time delay due to the need for maintenance work. The high-energy drying method is difficult to accurately control the drying temperature and time, and consumes a lot of energy. Summary of the invention

[0003] The purpose of the present invention is to provide a method for drying and curing corrugated beam guardrail panels to solve the problems of the traditional natural drying or inefficient drying methods proposed in the above-mentioned background technology, which have low renovation efficiency and poor delay time due to maintenance work requirements, and the high energy consumption drying method, which makes it difficult to accurately control the drying temperature and time and consumes a lot of energy.

[0004] To achieve the above purpose, the present invention provides the following technical solution: after completing the basic processes such as water washing, coating (phosphating treatment) and cleaning of the old corrugated beam guardrail, the following key steps are implemented in sequence, including the following steps: The guardrail panels are precisely hung on a special spray-specific fixing frame and placed in a drying device with precise temperature control function. The temperature is set to 160°C for assembly line drying. At the same time, the surface of the guardrail panels is fully dried with the help of the stable compressed air flow generated by the air compressor to ensure that the surface moisture is completely removed, laying a good foundation for the subsequent coating process. After drying, the guardrail panels are quickly transferred to the electrostatic automatic spraying area, where the plastic powder coating is evenly applied through advanced automatic spraying equipment, and then immediately dehydrated. During this process, the dehydration temperature is strictly controlled in the range of 130℃-160℃, and the dehydration time is maintained at 5-10 minutes, so as to promote the efficient volatilization of the solvent or water in the coating, avoid defects such as bubbles and sagging in the coating, and ensure the initial molding quality of the coating; The dehydrated guardrail is smoothly transferred to a professional oven for curing reaction. The oven temperature is precisely controlled in the range of 180℃-230℃, the curing time is maintained at 10-14 minutes, and high-precision sensors are used to monitor the dynamic changes of temperature and time in the oven in real time to ensure that it accurately matches the curing characteristic curve of the powder coating, so that the resin and other film-forming substances in the coating are fully cross-linked to form a dense, hard and highly adhesive protective layer, effectively improving the corrosion resistance and wear resistance of the guardrail.

[0005] After the curing process is completed, the guardrail board is immediately taken out of the curing furnace. According to the actual production conditions and process requirements, natural cooling or forced cooling is selected for cooling treatment to ensure that the coating is fully hardened and achieves the ideal mechanical properties, such as hardness, flexibility and impact resistance, etc., to meet the various mechanical environment requirements in actual use. After the curing process is completed, the guardrail board is immediately taken out of the curing furnace. According to the actual production conditions and process requirements, natural cooling or forced cooling is selected for cooling treatment to ensure that the coating is fully hardened and achieves the ideal mechanical properties, such as hardness, flexibility and impact resistance, etc., to meet the various mechanical environment requirements in actual use.

[0006] After the curing process is completed, the guardrail panel is immediately taken out of the curing furnace. According to the actual production conditions and process requirements, natural cooling or forced cooling is selected for cooling to ensure that the coating is fully hardened and achieves the ideal mechanical performance indicators, such as hardness, flexibility and impact resistance, so as to meet various mechanical environment requirements in actual use.

[0007] Finally, use professional testing instruments and standard testing methods to comprehensively check key quality parameters such as the appearance integrity, thickness uniformity, and adhesion strength of the guardrail coating after drying and curing to ensure that the coating is uniform and free of defects, the thickness meets the design standards, and the adhesion meets the safety requirements for use. Unqualified products are reworked or adjusted in a timely manner to ensure the reliability and stability of product quality.

[0008] Preferably, the dehydration treatment temperature in step 2 is 130° C. to 160° C., and the dehydration time is 5 to 10 minutes.

[0009] Preferably, the curing temperature of the corrugated beam guardrail plate in step three is 180° C. to 230° C., and the curing time is 10 to 14 minutes.

[0010] Preferably, during the curing process of the corrugated beam guardrail plate described in step 3, the temperature and time in the oven are monitored to ensure that the curing process of the corrugated beam guardrail plate meets the curing requirements of the powder coating.

[0011] Preferably, the cooling treatment method in step 4 is natural cooling or forced cooling.

[0012] Preferably, the post-processing method in step five is polishing and cleaning, and the equipment used for polishing is a laser cleaning machine.

[0013] Preferably, the equipment used for the compressed air drying operation in step 1 is an air compressor.

[0014] Compared with the prior art, the present invention provides a drying and curing method for a corrugated beam guardrail plate, which has the following beneficial effects: after a series of steps of washing, phosphating and cleaning the old corrugated beam guardrail plate, a pre-drying treatment is performed, and then electrostatic painting is performed, and finally a high-temperature powder drying and curing operation is performed, so that the surface moisture and solvent are better removed during the renovation process of the old corrugated beam guardrail plate, the solvent or moisture in the coating is completely volatilized after spraying, and the resin or other film-forming substances in the coating undergo a cross-linking reaction to form a hard protective layer; so as to achieve the purpose of a more uniform coating, thereby improving the service life of the refurbished corrugated beam guardrail plate; By precisely controlling the temperature and time during the drying and curing process, the renovation cycle of the corrugated guardrail is shortened; compared with traditional natural drying or inefficient drying methods, this method greatly improves the renovation efficiency and reduces delays caused by maintenance work; compared with traditional high-energy consumption drying methods, this method achieves energy savings while ensuring drying quality, which meets the current requirements of environmental protection and sustainable development.

[0015] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: The patent of the present invention provides a drying and curing method in the renovation process of old corrugated beam guardrail panels, which solves the problem of better removing moisture and solvents on the surface during the renovation process of old corrugated beam guardrail panels, and then completely volatilizing the solvent or moisture in the coating after spraying, and causing the resin or other film-forming substances in the coating to undergo cross-linking reaction to form a hard protective layer; so as to achieve a more uniform coating, thereby increasing the service life of the refurbished corrugated beam guardrail panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the process flow chart for drying and curing of corrugated beam guardrail panels.

[0017] Figure 2 This is a schematic diagram of the structure of drying and curing of corrugated beam guardrail panels.

[0018] Figure numerals: 1. conveying device; 2. pre-drying chamber; 3. high-temperature curing chamber; 4. cooling area; 5. special fixing frame for spraying; 6. heating tube; 7. infrared heating device. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The present invention provides a technical solution: a method for drying and curing a corrugated beam guardrail, comprising the following steps: Step 1: Pre-dry the old board at 160 degrees; First, hang the guardrail plate on the special spraying fixing frame 5, such as Figure 2 As shown, the guardrail plate is transported to the pre-drying chamber 2 by the conveying device 1, and is dried in a 160-degree assembly line by multiple groups of heating pipes 6 in the pre-drying chamber 2, and blown dry with compressed air; the equipment used for the compressed air blow-drying operation is an air compressor; Step 2: Electrostatic automatic spraying of plastic powder and dehydration treatment; After drying, the corrugated beam guardrail plate is subjected to an electrostatic automatic spraying of plastic powder, and then subjected to a dehydration treatment at a temperature of 130°C to 160°C and a dehydration time of 5 to 10 minutes; Step 3: Curing treatment of corrugated beam guardrail plate; The corrugated beam guardrail plate after dehydration treatment is transferred to the drying tunnel of the high-temperature curing chamber 3 for curing operation through the infrared heating device 7. The curing temperature of the corrugated beam guardrail plate is 180°C to 230°C, and the curing time is 10 to 14 minutes. During the curing process of the corrugated beam guardrail plate, the temperature and time in the drying tunnel are monitored to ensure that the curing treatment of the corrugated beam guardrail plate meets the curing requirements of the powder coating; Step 4: Cooling treatment; After the curing of the corrugated beam guardrail plate is completed, the corrugated beam guardrail plate is taken out of the curing furnace and transported to the cooling zone 4 for cooling treatment to ensure that the coating is fully hardened and achieves the desired mechanical properties; the cooling treatment method is natural cooling or forced cooling; Step 5: Post-processing of corrugated beam guardrail plate; The cured corrugated guardrail can be post-processed to further improve the performance of the coating. The post-processing method is grinding and cleaning. The equipment used for grinding is a laser cleaning machine. Step 6: Quality inspection; After the drying and curing process is completed, the coating appearance, thickness and adhesion of the corrugated beam guardrail are quality inspected.

[0021] Embodiment 1: Selection of guardrail panels and equipment configuration: old corrugated beam guardrail panels with specifications of 4320*506*85*3 and 4320*310*85*4 are selected as experimental samples, and their mechanical properties and chemical composition strictly comply with the current national standards; the main mechanical equipment includes: 3000W laser cleaning machine for efficient guardrail panel grinding pretreatment; high-speed guardrail powder spraying production line with automatic spraying and one-time molding, integrating drying, automatic spraying and molding functions to ensure process continuity and efficiency; FG30 air compressor provides stable air source support for spraying, blowing and other operations. The number of each equipment is reasonably configured according to the production scale and process rhythm to ensure the smooth operation of the production process. The process rhythm is reasonably configured to ensure the smooth operation of the production process.

[0022] Example 2: Details of drying and curing operations: After the phosphating, coating and water cleaning processes of the old boards are completed, the pre-drying program is started immediately, the guardrail boards are hung in order on a special fixing frame for spraying, and are dried on the assembly line in a drying equipment at 160°C, and are blown dry in all directions with the compressed air generated by the air compressor to ensure that the surface is dry and free of residual moisture; after drying, the plastic powder coating is evenly applied using the electrostatic automatic spraying function of the high-speed guardrail powder spraying production line, and then dehydrated for 510 minutes in the temperature range of 130°C-160°C, and the temperature and time parameters are strictly controlled to prevent quality problems in the coating; the dehydrated guardrail boards are quickly transferred to the drying tunnel and cured at 180°C-230°C for 1014 minutes. During the process, the environment in the drying tunnel is monitored in real time by temperature sensors and timers to ensure that it meets the powder coating curing requirements and that the coating cross-linking reaction is fully carried out.

[0023] Embodiment 3: Subsequent processing and quality control: After the cured guardrail is taken out, natural cooling or forced cooling is selected according to the production site conditions to fully harden the coating to the ideal mechanical performance state; then the guardrail is carefully polished and deeply cleaned with a laser cleaning machine to eliminate surface defects and improve coating performance; finally, according to JTGD812017 "Highway Safety Facilities Design Specifications", JTGF80 / 12017 "Highway Engineering Quality Inspection and Assessment Standards", GB / T31439.1 Corrugated Beam Steel Guardrail Part 1: Two Corrugated Beam Steel Guardrail, GB / T31439.2 Corrugated Beam Steel Guardrail Part 2: Three Corrugated Beam Steel Guardrail and GBT182262015 "Technical Conditions for Corrosion Protection of Steel Structures in Highway Traffic Engineering" and other standards and specifications, use coating thickness gauges, adhesion testers and other professional testing equipment to strictly test the integrity of the appearance of the guardrail coating, the uniformity of the thickness and the reliability of the adhesion, and promptly rework or adjust the products that do not meet the quality standards to ensure that the quality of the finished products meets or exceeds the industry standard requirements.

[0024] The present invention has the following beneficial effects: 1. The present invention significantly shortens the renovation cycle of corrugated guardrail panels by precisely controlling the temperature and time during the drying and curing process; compared with traditional natural drying or inefficient drying methods, this method greatly improves renovation efficiency and reduces delays caused by maintenance work.

[0025] 2. The present invention reduces energy consumption. Compared with the traditional high-energy consumption drying method, the present method saves energy while ensuring the drying quality, which meets the current requirements of environmental protection and sustainable development.

[0026] 3. The drying and curing method of the present invention is not limited to a specific type of corrugated guardrail plate, but has good versatility and adaptability, and can be widely used in renovation projects of different types of corrugated guardrail plates.

[0027] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A method for drying and curing a corrugated beam guardrail, characterized in that: The steps include: Step 1: Pre-dry the old board at 160 degrees; First, hang the guardrail board on a special spraying fixed frame, put it into the 160-degree production line for drying, and use compressed air for drying; Step 2: Electrostatic automatic spraying of plastic powder and dehydration treatment; After drying, the corrugated beam guardrail plate is subjected to an electrostatic automatic spraying of plastic powder and then a dehydration treatment; Step 3: Curing treatment of corrugated beam guardrail plate; The dehydrated corrugated beam guardrail plate is transferred to a drying tunnel for curing; Step 4: Cooling treatment; After the curing of the corrugated beam guardrail plate is completed, the corrugated beam guardrail plate is taken out of the curing furnace and cooled to ensure that the coating is fully hardened and achieves the desired mechanical properties; Step 5: Post-processing of corrugated beam guardrail plate; The cured corrugated guardrail can be post-processed to further improve the performance of the coating; Step 6: Quality inspection; After the drying and curing process is completed, the coating appearance, thickness and adhesion of the corrugated beam guardrail are quality inspected.

2. A method for drying and curing a corrugated beam guardrail according to claim 1, characterized in that: The dehydration treatment temperature in step 2 is 130° C. to 160° C., and the dehydration time is 5 to 10 minutes.

3. The method for drying and curing a corrugated beam guardrail according to claim 1, characterized in that: The curing temperature of the corrugated beam guardrail plate in step 3 is 180°C to 230°C, and the curing time is 10 to 14 minutes.

4. The method for drying and curing a corrugated beam guardrail according to claim 1, characterized in that: In step 3, during the curing process of the corrugated beam guardrail plate, the temperature and time in the oven are monitored to ensure that the curing process of the corrugated beam guardrail plate meets the curing requirements of the powder coating.

5. The method for drying and curing a corrugated beam guardrail according to claim 1, characterized in that: The cooling treatment method described in step 4 is natural cooling or forced cooling.

6. The method for drying and curing a corrugated beam guardrail according to claim 1, characterized in that: The post-processing method in step five is grinding and cleaning, and the equipment used for grinding is a laser cleaning machine.

7. The method for drying and curing a corrugated beam guardrail according to claim 1, characterized in that: The equipment used for the compressed air drying operation in step 1 is an air compressor.

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