varnish/primer production line

The seven components of the varnish/primer production line mainly include pretreatment equipment, powder spraying system, paint spraying equipment, oven, heat source system, electric control system, hanging conveyor chain, etc.

Pretreatment equipment

A spray multi-station pretreatment unit is a common equipment for surface treatment. Its principle is to use mechanical scouring to accelerate chemical reactions to complete the process of oil removal, phosphating, water washing, and so on. Typical spray pretreatment processes for steel parts are pre degreasing, degreasing, water washing, water washing, surface conditioning, phosphating, water washing, water washing, and pure water washing. The pre-treatment can also adopt a shot blasting machine, which is suitable for steel parts with simple structure, serious corrosion, and no oil or little oil. And no water pollution.

Powder spraying system

The small cyclone + filter element recovery device in powder spraying is an advanced powder recovery device with fast color change. It is suggested that the key parts of the powder spraying system should be imported products, and the powder spraying room, electric mechanical elevator, and other components should be localized.

Painting equipment

For example, oil spray paint booths and water curtain paint booths are widely used for surface coating of bicycles, automobile leaf springs, and large loaders.

Oven

The oven is one of the important pieces of equipment in the coating production line. Its temperature uniformity is an important index to ensure the coating quality. The heating methods of the oven include radiation, hot air circulation, and radiation + hot air circulation. According to the production program, it can be divided into single rooms and through types. The equipment forms include the straight-through type and bridge type. The hot air circulation oven has good thermal insulation, a uniform temperature in the oven, and less heat loss. After testing, the temperature difference in the oven is less than ± 3oc, which meets the performance indicators of similar products in advanced countries.

Heat source system

Hot air circulation is a common heating method. It uses the principle of convection conduction to heat the oven to achieve the drying and solidification of the workpiece. The heat source can be selected according to the specific conditions of users: electricity, steam, gas, or fuel oil. The heat source box can be set at the top, bottom, and side according to the situation of the oven. If the circulating fan for producing heat source is a special high-temperature fan, it has the advantages of long service life, low energy consumption, low noise, and small volume.

Electronic control system

The electrical control of coating and coating lines includes centralized and single train control. The centralized control can adopt the programmable logic controller (PLC) to control the host, automatically control each process, collect data, monitor and alarm according to the prepared control program. Single row control is the most commonly used control mode in the coating production line. Each process is controlled in a single row. The electric control box (cabinet) is set near the equipment, with low cost, intuitive operation, and convenient maintenance.

Hanging conveyor chain

The suspension conveyor is the conveying system of the industrial assembly line and varnish/primer production line. The accumulation type suspension conveyor is applied to the storage shelves with l=10-14m and the coating line of alloy steel pipes for special-shaped street lamps. The workpiece is hoisted on a special hanger (with a load of 500-600kg), and the switch in and out is smooth. The switch is opened and closed by electrical control according to the work order to meet the automatic transmission of the workpiece at each processing station. The workpiece is cooled in parallel in the strong cooling room and the lower part area, and the hanger identification and traction alarm shutdown devices are set in the strong cooling area.

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