Electrophoretic Coating Suspension Conveyor System for Automotive Structural Components

　　Electrocoating production lines are gaining popularity in today’s market. They primarily consist of seven key components and are ideal for applying and treating coatings on workpiece surfaces—as well as for spraying both individual and small parts. Below is a brief overview of the seven components that make up the coating line:

　　I. Pre-processing Equipment

　　The spray-type multi-station pretreatment unit is a commonly used piece of equipment in surface treatment. It works by leveraging mechanical agitation to accelerate chemical reactions, thereby efficiently carrying out processes such as degreasing, phosphating, and water rinsing. A typical pretreatment process for steel parts using the spray method includes: pre-degreasing, degreasing, cleaning, washing, surface treatment, phosphating, further cleaning, and finally, pure water rinsing. Alternatively, shot blasting machines can also be employed for pretreatment—particularly suited for steel components with simple structures, severe rust, or minimal/no oil contamination—and this method ensures no water pollution.

　　2. Powder Spraying System

　　The compact cyclone dust collector combined with a filter cartridge recovery system in powder coating is a more advanced powder recovery unit, enabling faster color changes. For the critical components of the powder spraying system, it is recommended to use imported products, while parts such as the powder spray booth and electric-mechanical lifters will be entirely domestically produced.

　　3. Spray Painting Equipment

　　Oil-spray booths and water curtain spray booths are widely used for surface coating applications in bicycles, automotive leaf springs, and large loaders.

　　4. Oven

　　The drying oven is one of the critical pieces of equipment in a coating production line, and its temperature uniformity is a key indicator for ensuring high-quality coatings. Heating methods for ovens include radiation, hot-air circulation, and combinations of both radiation and hot-air circulation. Depending on the production requirements, ovens can be categorized into single-chamber and through-type designs, with equipment options such as straight-through and hot-air types, as well as bridge-style models. Hot-air circulation ovens offer excellent insulation, ensuring even temperatures throughout the chamber while minimizing heat loss. Testing has shown that the temperature difference within the oven remains below ±3°C, meeting performance standards comparable to those of similar products manufactured in developed countries.

　　5. Heat Source System

　　Hot-air circulation is currently a widely used heating method that leverages the principle of convective heat transfer to heat the oven, ensuring efficient drying and curing of workpieces. The heat source can be selected based on the user’s specific requirements—options include electricity, steam, gas, or fuel oil. Additionally, the location of the heat source unit can vary depending on the oven design: it can be positioned at the top, bottom, or side of the oven.

　　6. Electronic Control System

　　The suspended conveyor is a transportation system used in industrial assembly and painting lines. The stack-type suspended conveyor is specifically designed for storage racks with lengths ranging from L = 10 to 14 meters, as well as for the painting production line of special-shaped streetlight alloy steel tubes. Workpieces are securely hung on dedicated carriers capable of supporting loads between 500 and 600 kg. The switch mechanisms ensure smooth entry and exit, allowing precise control via electrical switches based on operational commands. This system enables automated transport, facilitating the parallel accumulation and cooling of workpieces across various scientific and technical areas within both the strong cooling chamber and lower zones. Additionally, it incorporates advanced features such as identification, traction alarms, and emergency stop devices within the high-cooling area.