Continuous coating production line for sheet metal frames

A continuous coating production line for sheet metal frames is a specialized automated production line for surface coating of sheet metal frame structures. It is widely used in the production of various metal products, such as appliance casings, metal furniture, and mechanical frames. Here is a detailed description:

I. Production Line Composition

1. Pre - treatment System

   • Degreasing Tank: Removes oil and impurities from the surface of sheet metal frames using chemical degreasers to ensure surface cleanliness.

   • Water - washing Tank: Multiple water - washing stages remove residual degreasers to prevent interference with subsequent phosphating treatment.

   • Phosphating Tank: Forms a uniform phosphate film on the surface of sheet metal frames to enhance coating adhesion and corrosion resistance.

   • Deionized Water - washing Tank: Further cleans the surface with deionized water to ensure no residual impurities.

   • Drying Equipment: Uses hot - air drying or infrared drying technology to remove moisture from the surface of sheet metal frames.

2. Spraying System

   • Electrostatic Spraying Equipment: Utilizes electrostatic principles to evenly coat the surface of sheet metal frames with powder or liquid coatings. Electrostatic spraying equipment, typically equipped with automatic spray guns, achieves efficient and uniform spraying effects.

   • Powder Recovery System: Recovers powder coatings that did not adhere to the workpiece surface, improving coating utilization and reducing waste.

3. Curing System

   • Curing Oven: Cures the coating through high - temperature heating. The curing oven usually employs gas or electric heating methods and can precisely control temperature and time to ensure coating performance.

4. Conveying System

   • Suspension Conveying Chain: Suspends sheet metal frames and moves them continuously between various treatment stations. The suspension conveying chain can be adjusted according to the length of the production line and process requirements.

   • Roller Conveyor System: Suitable for conveying large sheet metal frames, smoothly transporting workpieces to various treatment stations through rolling.

5. Auxiliary Systems

   • Exhaust Gas Treatment System: Treats exhaust gases generated during the spraying process to ensure compliance with environmental protection requirements.

   • Wastewater Treatment System: Treats wastewater generated during the pre - treatment process to prevent environmental pollution.

II. Process Flow

1. Loading: Hang or place sheet metal frames on the conveying chain or roller conveyor system.

2. Pre - treatment: Sequentially pass through degreasing, water - washing, phosphating, deionized - water - washing, and drying processes to ensure the surface of sheet metal frames is clean and has good adhesion.

3. Spraying: Enter the spray booth, where the coating is evenly sprayed onto the surface of sheet metal frames using electrostatic spraying equipment.

4. Curing: The sprayed sheet metal frames enter the curing oven, where the coating is cured at high temperature.

5. Cooling and Inspection: The cured sheet metal frames are cooled in the cooling area, followed by appearance and quality inspection.

6. Unloading: Qualified products are unloaded from the conveying system, packaged, and stored.

III. Equipment Features

1. High - efficiency Automation: The entire production line runs automatically, reducing manual intervention and improving production efficiency and product quality.

2. High - quality Coating: Electrostatic spraying technology ensures a uniform coating with strong adhesion and good appearance quality.

3. Environmental - friendly and Energy - saving: Advanced exhaust and wastewater treatment systems reduce environmental impact. Meanwhile, the powder recovery system improves coating utilization, lowering production costs.

4. Strong Adaptability: The conveying system and spraying parameters can be adjusted according to the shape and size of different sheet metal frames to meet diverse production needs.

5. Easy Maintenance: The equipment has a compact structure, making it easy to maintain and clean, reducing the cost of operation and maintenance.

The continuous coating production line for sheet metal frames is an essential piece of equipment in modern metal product manufacturing. It can effectively improve production efficiency and product quality while meeting environmental requirements.