Continuous pre-treatment equipment for coating production line

The continuous pre-treatment equipment for a coating production line is a crucial device for surface pre-treatment of workpieces in the coating process. It prepares a clean, uniform surface with good adhesion for subsequent coating operations.

I. Equipment Functions

1. Degreasing: Removes oil, grease, and dust from the workpiece surface to ensure cleanliness.

2. Surface Adjustment: Prepares the workpiece surface for phosphating, ensuring uniform phosphating film formation.

3. Phosphating: Forms a uniform phosphate film on the workpiece surface through chemical reactions to enhance coating adhesion and corrosion resistance.

4. Water Washing: Multiple water washes remove residual chemicals from the workpiece surface to prevent adverse effects on subsequent coatings.

5. Drying: Removes moisture from the workpiece surface to prevent interference with subsequent spraying effects.

II. Equipment Composition

1. Spraying System

   • Spraying Tanks: Used for spraying degreasing agents, surface adjusters, phosphating solutions, and water. The tanks are equipped with multi - stage spraying devices to ensure uniform workpiece surface treatment.

   • Nozzles: Special - designed nozzles produce high - pressure water jets to effectively rinse the workpiece surface.

2. Conveying System

   • Suspension Conveying Chain: Used to hang workpieces and move them continuously between various treatment tanks. The chain can be adjusted according to the length of the production line and process requirements.

   • Roller Conveyor System: Suitable for conveying large workpieces or sheets. The system smoothly transports workpieces to various treatment stations through rolling.

3. Heating System

   • Heating Devices: Heat degreasing agents, phosphating solutions, and other chemicals to ensure chemical reactions occur at the appropriate temperature.

   • Temperature Control Devices: Precisely control the temperature of each treatment tank to ensure stable process parameters.

4. Circulation and Filtration System

   • Filtration Devices: Filter impurities from the spraying liquid to prevent nozzle blockage and ensure the cleanliness of the spraying liquid.

   • Circulation Pumps: Recirculate the treatment liquid to the spraying tanks to ensure uniform distribution.

5. Drying System

   • Hot - air Drying Devices: Dry the workpiece surface with hot air, achieving good drying effects and high efficiency.

   • Infrared Drying Devices: Quickly dry the workpiece surface using infrared radiation heat, suitable for workpieces sensitive to temperature.

III. Process Flow

1. Workpiece Loading: Hang or place the workpieces on the conveying chain or roller conveyor system.

2. Degreasing Treatment: The workpiece enters the spraying degreasing tank, where it is sprayed with degreasing agents to remove surface oil.

3. Water Washing: After degreasing, the workpiece enters the water - washing tank to remove residual degreasing agents.

4. Surface Adjustment: The workpiece enters the surface - adjustment tank to prepare the surface for phosphating.

5. Phosphating Treatment: The workpiece enters the phosphating tank, where a phosphate film is formed through chemical reactions.

6. Water Washing: Wash again to remove residues after phosphating.

7. Drying: The workpiece enters the drying device to remove surface moisture.

8. Unloading: The treated workpiece is removed from the conveying system and prepared for subsequent coating operations.

IV. Equipment Features

1. High Automation: The entire pre - treatment process runs automatically, reducing manual intervention and improving production efficiency.

2. Uniform Treatment: Multi - stage spraying and circulation filtration systems ensure uniform workpiece surface treatment, providing a solid foundation for subsequent coating.

3. Energy - saving and Environment - friendly: Advanced heating and drying technologies reduce energy consumption and minimize wastewater discharge.

4. Strong Adaptability: The process parameters and equipment configurations can be adjusted according to different workpiece shapes and materials to meet diverse production needs.

5. Easy Maintenance: The equipment has a compact structure, making it easy to maintain and clean, reducing operating costs.

The continuous pre - treatment equipment for a coating production line is widely used in industries such as automotive manufacturing, home appliance production, and mechanical processing. It is a key link in ensuring coating quality.