powder coating spray 3

2016/10/13 9:46:13

The following are the main functions of the equipment and the important parameters are 


briefly introduced as follows:

1 spraying host

The use of the market on the use of the 


spraying machine is dispersed, and some are combined. No matter what mode, the function is 


the same: the powder coating is uniform, and the surface of the metal work piece is 


absorbed. The main function of high voltage electrostatic generator is to produce high 


voltage electric charge, and the zero potential of the workpiece to produce the potential 


difference, the formation of powder coating particles of the main power. The general high 


voltage generator input voltage 220V (or input 24V or 36V) after several times of high 


frequency oscillation, voltage amplification, the output voltage can be as high as 50 


100KV, but under normal conditions (non short-circuit state) output current is only 10 


20uA, no damage effect on the human body. When the normal work will be adjusted to 45 50KV 


high pressure spray gun - powder coating can make good adsorption (the workpiece hanging 


device should be well grounded, R is less than or equal to 4 ohms), such as the second 


additional spraying voltage to 60 70KV (or the preheating workpiece after spraying), 


otherwise it is not easy to powder.

The gun is a key component for powder coating by powder 


barrel gun body must reach the workpiece, good insulation properties, when the workpiece 


from the nozzle distance should be maintained easily between 120 - 180mm, according to the 


different work piece to select a different spray diffusion body is fixed on the gun head to 


achieve uniform atomization. If the distance is too close to the workpiece surface coating 


caused by short circuit arcing, the breakdown point, affects the coating effect; distance 


too far is not easy to absorb powder. When spraying gun must be kept with the workpiece 


perpendicular to the plane, and the moving speed of uniform speed is 0.1 M / s, the 


vertical distance without gaps, but the spray and spray leakage. The powder line length of 


3 - 5 meters, high voltage cable should be well insulated, do not cross docking. In the 


production process of the operator should wear conductive shoes, banned under the pad 


insulation board operation.

Powder feeding barrel is the main equipment to influence the 


amount of powder and atomization during powder spraying. On the market the use of flow 


boiling for powder barrels, usually into powder coating of volume of 2/3 barrels of 


production, adjust the boiling pressure (also called flow pressure) in 0.05 - 0.08Mpa, 0.08 


- 0.12Mpa adjust the air pressure, the powder supply generally between 80 - 150g/min, 


(according to the workers skilled degree and shape of the workpiece and the difficulty of 


adsorption and). If the powder in the powder barrels to add recycling, must be over 180 


after the sieve to add, add a proportion of the recovery and three new powder mixed as 


easy. Production must be used to clean up the powder in the powder barrel, to prevent the 


powder damp or micro hole plate damp blockage. The control system mainly includes 


electromagnetic valve and pressure relief valve, control for powder and air links and 


broken through the handle switch.

2 spray chamber

Spray chamber is the main equipment to make 


the work piece to be coated on the surface of the workpiece, it is required that the height 


and the opening of the workpiece are easy to operate, and the less the opening is, the 


better.

3 Recovery Unit

At present on the market recovery device generally has two kinds, the 


traditional old-fashioned primary recovery and two recovery; a recovery that is the cyclone 


recovery, through cyclone recovery, at the bottom left a lot of recycling powder, the air 


is discharged into the two recovery device containing powder. Two recovery device is 


composed of a filter bag and a vibrator, the air discharged through the filter bag wall, 


superfine powder (only a small amount, about 2 - 5%) at the bottom of the bag. The old 


recycling device has the disadvantages of large floor area, difficulty in cleaning and 


changing of powder.

The novel recovery device is improved on the basis of the old recovery 


device. The two recovery and a recovery back, let the air into the bag containing powder or 


core wall, pumping air leaving the recovery powder (until the spray room), every two to 


three minutes by the anti pulse device form air reverse blowing and finish in a few 


seconds, the powder adsorbed on the earthquake the bag or filter on to spray chamber, and 


then repeat the initial working condition. Pulse back blow when several filter filter, it 


will not make the dust overflow. Most of the filter paper made of paper, coated with 


organic resin, the surface is smooth, not easy to stick powder, filter paper strength, good 


permeability, outside the metal mesh protection, can be used for a long time.

Whatever the 


way of recycling, ensure indoor dust can not overflow for the purpose must be, general 


spray room should be 0.05 to form a negative pressure of about 0.09Mpa, the spray room at 


the opening of the air velocity should be controlled within 0.5 0.6m/ seconds, in order to 


achieve this purpose.

4 delivery system

Transport system mainly includes conveyor chain and 


truck etc.. Large automatic spraying production line with the suspension conveyor chain 


more directly to the workpiece to the spray chamber, after spraying directly to the curing 


furnace, workers are only responsible for unloading, bear fruit. This kind of conveyor 


chain requirements to adjust the motor speed, to cure time 20 minutes, at the same time, 


there is enough time to spray. The conveyor chain is the key to ensure the smooth 


transmission of good lubrication good coating, must use high-temperature lubricant (MoS2 or 


high calcium base grease), small production line is often used in manual operation, after 


spraying hanging in a cargo car into the curing furnace. The freight car transportation 


requirements promote smooth, convenient, suitable for low hanging workpiece can.

5 curing 


device

At present, the electrostatic powder coating curing device used from the structure 


divided into two kinds of cave and tunnel, tunnel type curing oven is suitable for large 


batch, variety of fixed and single product. Equipped with automatic conveyor chain, large 


output, high energy consumption, suitable for continuous uninterrupted production, and cave 


type curing oven is to the contrary, it is by small and medium enterprises like individual. 


From the thermal energy is divided into fuel.


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