Automatic Powder Coating Line In America For Industrial Products

1) Scope of application of equipment

This equipment is suitable for powder coating process of metal components, and the maximum size of metal components is (mm): L2400 × W900 × H1400; The Y-shaped lifting appliance of the conveyor chain bears a load of 55KG; The baking temperature is 180-220 ℃ (adjustable).

2) Main accessories of the equipment

The equipment mainly consists of a cleaning and spraying room, a drying room, a powder spraying room, a reciprocating machine, a powder spraying gun, a baking room, a suspension chain conveying equipment, and an electric control system.

1, Basic parameters

1.1. Dimensions of the workpiece (mm * mm * mm): 2400x900x1400.

1.2 Spray time: 7 hours per day

1.3 Production site (m * m): 19.2x12.2.

1.4 Power Supply:

Three phase AC: 240V; Frequency: 60Hz;

2, Process flow and production capacity

1.1. Spray painting line: hanging up → spraying with clean water → drying (100-120 ℃) → spraying (automatic or manual spraying) → baking paint (adjustable at 180-220 ℃) → cooling → hanging down.

1.2. Conveyor chain speed: 0.5-0.8m/min.

3, Equipment process description and structural design

1. Clean water spray cleaning room

The framework of the spray room is made of 80 × 80 galvanized carbon steel square tubes, and the wall panels of the tank are made of 0.9mm thick SUS304 stainless steel plates. The bottom plate of the room is made of 2.0mm thick SUS304 stainless steel plate.

The circulating water tank is made of 2mm thick SUS304 stainless steel plate, and the tank is equipped with SUS304 filter screen. The spray pump adopts a vertical PP centrifugal pump with a power of 1.5kw, a flow rate of 16m3/h, and a pressure of 2bar. The material of the spray pipe is hot-melt PPR.

2. Conveyor equipment

The conveying equipment mainly consists of electric drives, heavy hammer tensioning mechanisms, chains, rails, curved rails, telescopic rails, inspection rails, brackets, electrical control systems, overload automatic protection devices, etc. Adopting a 150 type heavy-duty suspension conveyor chain and a Y-shaped lifting device with a single point lifting capacity of 55Kg; Electric drive Vmax ≈ 0.5-1m/min, install 1 set of electric drive. The tensioning device is equipped with a displacement limit protection switch device to ensure smooth operation of the entire chain. Emergency stop switches are installed in the upper and lower workpiece areas, powder spraying areas, and high-temperature baking areas along the entire line, with mechanical and electrical dual safety protection installed for the driving system; The material of the chain track support frame is 100 × 100 carbon steel square tube.

3. Drying oven and baking oven

The drying oven and high-temperature baking oven adopt a straight through structure, and the bottom frame of the baking chamber is made of profiles, which are made of 80 × 80 galvanized steel square tubes with a thickness of 2.0mm. The insulation board for the drying oven chamber is made of 75mm rock wool sandwich panel, and the insulation board for the high-temperature drying oven chamber is made of 125mm rock wool sandwich panel. The inner and outer panels of the insulation board are 0.6mm thick color coated boards, and the middle layer is filled with 100K rock wool insulation material. The inner and outer panels are pressed together with the insulation material as a whole, and the temperature of the outer wall of the chamber is not higher than 10 ℃ above the ambient temperature.

4. Heating system

The heating device adopts 2602 (high-temperature pressure resistant ceramic pieces) natural gas infrared radiation direct heating method, and the natural gas infrared radiation heater is installed at the bottom of the baking furnace. The specification of each set of natural gas infrared radiation heater is 930 * 135 * 190 (mm), with a heating capacity of 10.3 (8.9) kw (kcal/h). Install 16 sets of drying ovens; Install 42 sets of high-temperature baking ovens.

The temperature control systems of the high-temperature baking oven and the drying oven are each equipped with one set of temperature control, and the temperature inside the baking oven (the system will automatically maintain a constant temperature at the set baking temperature).

The temperature inside the baking room is automatically controlled by a digital temperature controller for both heating and temperature control, and an alarm will be triggered when the temperature exceeds the limit. The temperature inside the drying oven and high-temperature baking oven is independently controlled.

5. Thermal insulation

Install one set of air curtains at each entrance and exit of the drying oven and baking oven. The air curtains blow out from one side of the baking oven entrance and exit, and return air from the other side. The power of the hair dryer is 1.5-2.2 kW. Install one exhaust pipe at the top of the entrance and exit of the baking oven.

6. Powder spraying room

1) Powder spraying room equipment: 1 set;

2) Powder recycling device: 2 sets;

3) Spraying method: manual spraying method.

4) Material requirements for powder room: The spray room body is made of T1.2mm steel plate material, with a surface powder coating.

5) Recycling method: Two side recycling system.

6) Recycling fans: quantity 2, model 4-72; Airflow: 6000M3/h; Total pressure: 1200Pa; Power: 5.5kw.

7) Exhaust duct: The duct is made of T0.8 galvanized sheet metal combined with angle iron flange.

7. Electrical Control

The electrical control system mainly consists of a spray room, a powder spraying room, a powder spraying gun, a reciprocating machine, a drying oven, a high-temperature baking oven, and a conveyor chain control.

Each motor operation control circuit is equipped with corresponding low-voltage circuit breakers, thermal relays and other protective components to achieve short circuit and overload protection of the motor. During normal operation, there is a green signal light display, and in case of a fault, there is an audible and visual alarm. The main electrical components of the control system are made of high-quality domestic and foreign products, or branded products from Sino foreign joint ventures.

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