Spray gun type and usage

Spray gun type and usage

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A spray gun is a device that uses liquid or compressed air for rapid release as a power source. It is usually used for spraying, cleaning, spraying, and treating surfaces such as spray guns. Installed on the machine is divided into automatic spray gun or manual spray gun. The nozzle has a pore size and can be adjusted by itself, so that the effect of the particles sprayed by the paint is diversified.

1. Siphon type spray gun: Siphon type spray gun is the most widely used spray gun in automobile painting repairing work, also known as upper suction type spray gun. When spraying, the airflow is used to attract the paint to the top, and the nozzle is caused by pressure. .

The working process is: the paint is placed in the paint cup, the paint cup is connected to the spray gun, and the air valve is opened when the trigger is halfway, the compressed air flows through the spray gun, is sprayed from the hole in the air cap, and is formed at the outlet of the spray paint nozzle. Vacuum; continue to pull the trigger, so that the thimble leaves the inner seat of the nozzle, vacuum draws the paint from the paint cup, feeds it into the paint port, and ejects it from the spray nozzle. Simply put, air enters the paint cup from the air vent and fills the position of the material that is sucked out. Because the paint can is heavy, it will make the user feel tired.

 

2. Gravity spray gun: The paint cup is on the spray gun nozzle, and the paint is sprayed on the surface of the object by the weight of the paint and the pressure difference generated by the airflow at the tip end of the nozzle.

The operation mode is the same as that of the siphon type spray gun. The paint is supplied to the spray nozzle by the gravity of the paint, and then the paint spray nozzle is sucked out by suction. It is also called the lower suction spray gun, and the position of the paint cup can be easily adjusted, but the paint cup is above the nozzle. Therefore, it will affect the stability of the spray gun and is suitable for high solids coatings.

 

3. Pressure-feeding spray gun: The operation mode of the pressure-feeding spray gun is that the paint is pressed against the air cap by pressure, and the pressure is provided by a separate pressure tank, and the spray gun nozzle is flush with the front surface of the air cap.

It is not necessary to stop to paint the paint can when spraying large surfaces, but it is not suitable for small-area spraying, because it takes more time to change the color and clean the spray gun.

 

Spray type

advantage

Disadvantage

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Siphon spray gun

 

The spray can has a large capacity and is suitable for large-area coating and full-coating, and can spray a better atomization effect.

Due to the large volume of the spray can, it is easy to cause fatigue to the applicant, and some paint will leave the bottom of the spray can.

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Gravity spray gun

 

The particles will not remain in the bottom of the spray can, and are suitable for small-area coating. The high-viscosity coating of 20~30 s can also be sprayed, which is convenient for operation and strong maneuverability.

The spray can has a small volume and needs to be replenished frequently. It is not suitable for full coating.

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Pressure-feeding spray gun

 

 

The spray can has a large capacity and is suitable for large-surface spraying. It can spray a good atomization effect to meet the thickness and gloss requirements of the paint film. It is suitable for production lines that do not change colors frequently and have a large amount.

It takes more time to change colors or clean the spray gun

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2019-08-07