Equipment composition of automatic ground-chain spraying production line for motorcycle aluminum alloy wheels
The equipment composition of the chain-type electrostatic automatic coating line process for motorcycle aluminum alloy wheel coating is mainly determined by the process flow, the size of the plant, the plant layout, and the production volume. The motorcycle aluminum alloy wheel is due to the small size of the workpiece and the output Large, so the equipment mainly includes pre-treatment cleaning system, pure water production system, fuel moisture drying and curing heating system, ground chain support and conveying drive system, fixed gun tracking spraying electrostatic automatic spraying system, waste water treatment system and other related auxiliary equipment And other composition.
1. Pre-treatment cleaning system
The pre-treatment cleaning system consists of hot water washing tank, pre-degreasing tank, immersion degreasing tank, spray degreasing tank, meter adjustment tank, passivation tank, immersion washing tank and other water washing spray tanks, pure water spray tanks, tank liquids Heating system, degreasing device and automatic dosing system, these equipment can well meet the requirements of all aluminum alloy motorcycle wheels degreasing and surface passivation film formation, the key is to ensure that the cutting oil on the hub , The mechanical oil is removed, and the degreasing agent residue is rinsed in the subsequent water washing, so as to ensure that a uniform and fine passivation film is formed on the surface of the product during passivation, and a qualified substrate sheet can be provided for subsequent coating.
In order to achieve the above purpose, the pre-treatment cleaning process adopts the best technological means of spraying and immersion combined with ultrasonic degreasing; the concentration of the bath liquid is guaranteed at any time by the automatic dosing system of the metering pump to ensure the degreasing, meter adjustment and passivation of the tanks The concentration of the liquid is controlled within the process range at any time; the tank liquid is heated by a stable and safe oil-fired hot water boiler heating device, which has fast heating speed, high thermal efficiency and significant energy saving effect.
2. Pure water production system
The pure water production system includes pure water production equipment, intermediate storage tanks, pure water storage tanks, pure water delivery pipes, and pure water delivery pumps. According to the principle of production, it can generally be divided into reverse osmosis type, electrodialysis type and Ion resin exchange type, the reverse osmosis type is the best, the pure water produced is of good quality and easy to operate, but the equipment price is higher, and the replacement cost of the reverse osmosis membrane during operation is also higher; pure water produced by ion resin exchange equipment It can also meet the requirements, but the operation is more complicated. At the same time, the regeneration requirements of anion and cation resins are quite strict. Otherwise, the pure water produced will not meet the requirements of pure water for coating, and it will be easy to remain after drying.
Water marks. The motorcycle aluminum wheel coating line can reasonably select one of the types of pure water production systems according to the actual production situation and investment requirements. Pure water is used for the last two washing sprays of the pretreatment to completely remove the residues of the pretreatment chemicals and impurities. At the same time, the residues of the tap water (hard water) spray are also removed. The hard water residues are easy to form water after the moisture is dried. Traces affect the performance of the coating film.
3. Fuel moisture drying and curing heating system
The fuel oil moisture drying and curing heating system adopts a good heat preservation performance. The coating section of the production line adopts a ground chain conveyor line and a horizontal square bridge drying furnace with aluminum alloy wheels, including a burner, a stainless steel heat exchanger, an axial circulation fan, and a drying furnace. Dry room, air supply pipeline, circulating hot air filter and drying room automatic exhaust gas device, the products hanging on the conveyor chain directly pass through the drying room at a uniform speed. Whether the temperature in the bridge drying furnace (curing furnace) is uniform or not, the key lies in the air pressure of the circulating air, the air flow in the air supply pipe, and the opening arrangement of the air supply pipe.
4. Ground chain support and conveying drive system
It is placed on the ground chain support. The middle of the support is equipped with a sprocket. When passing through the electrostatic automatic spraying section, the fixed chain drives the sprocket and drives the hub to rotate in the horizontal direction with the center hole as the center of the circle. The advantage of ground chain conveying workpieces is that the spray room adopts central air supply, which can form upper air supply and lower exhaust air in the spray room, and the grease, oil dust and large paint on the hanger in the ground chain track will not fall off. On the workpiece, the influence of spray particles is reduced; the running track of the workpiece is more stable than the suspension chain, which provides a good foundation for automatic painting.
5. Static automatic spraying system with fixed gun tracking spraying
When the wheel hub enters the entrance of the spray booth, the workpiece detection system detects the workpiece information and sends a signal to the tracking spraying control system. When the workpiece reaches the spray booth painting position, the first set of 2 electrostatic air spray gun pairs on the horizontal tracking reciprocating machine Spraying is performed on the upper part of the hub, and the second set of 2 electrostatic air spray guns is sprayed on the lower part of the hub. The spray gun tracks the spraying time, and adjusts it according to the actual conditions such as the process chain speed and the spraying effect. Finally, a manual inspection is carried out, and the partial corners are manually sprayed to make the workpiece completely sprayed.
The moving speed of the horizontal tracking reciprocator is interlocked with the chain speed of the conveyor chain, and the traveling speed remains the same; when the conveyor chain is abnormal or emergency stops, the automatic spray system on the reciprocator can automatically reset after the spraying procedure is completed; connect to the reciprocator The greater the degree of freedom of the fixed rocker arm with the electrostatic spray gun, the easier it is to adjust the spray angle of the spray gun. At the same time, the angle and position scales must be engraved on each part of the rocker arm to facilitate the development of the spraying process for each shape of wheel hub.
6. Wastewater treatment system
The wastewater from the coating line is mainly the wastewater from the pre-treatment degreasing, passivation and paint spraying tanks. These wastewater contain acids, alkalis, resin cured products, and a small amount of organic substances such as toluene. The treatment equipment mainly includes regulating tank, dosing device, integrated tank, floatation device, mechanical filter press, adsorption device sludge dewatering device and various valves, pumps, etc. After these equipments are processed according to a certain process, the wastewater from the coating line is It can meet the requirements of national emission standards.
7. Other related auxiliary equipment
Other related auxiliary equipment of the motorcycle aluminum alloy wheel ground-chain electrostatic automatic spraying line mainly includes the workpiece infrared radiation preheating system, the conveyor chain automatic refueling system, the power distribution cabinet, the switch control cabinet, the power cable, the cable tray, and the wind forced cooling device , Clean air supply device, exhaust gas discharge device, etc.