How does the spray gun work? How does the spray gun work?
Abstract: What is the working principle of the spray gun? Different types of spray guns, the principle is not the same. Below, Xiaobian will introduce you to the principle of the three types of spray guns, which are the working principle of the electrostatic spray gun, the working principle of the automatic spray gun, and the working principle of the paint spray gun.
[The principle of the spray gun] How does the spray gun work? How does the spray gun work?
Principle of electrostatic spray gun
The air hose supplies air to the gun.
Part of the air is used for turbine operation and the remaining air is used to atomize the spray fluid.
The turbine generates a power source that is converted to a high voltage current by an electric raft for use by the gun electrode.
The pump is used to supply fluid to the hose and gun, and the fluid is electrostatically charged as it passes through the electrode.
The charged fluid is attracted to the grounded workpiece, surrounding the workpiece and evenly applied to all surfaces.
Principle of automatic spray gun
The inside of the automatic spray gun has a pneumatic piston mechanism with a stainless steel needle above the piston and a set of high tension springs behind the piston. When the compressed air stops supplying, the spring pushes the piston and the needle forward. When the needle and the nozzle are closely matched with high precision to block the passage of the liquid, when the compressed air starts to be supplied, the pressure of the compressed air pushes the piston open, so that a gap is formed between the needle and the nozzle to allow the liquid to be ejected. The liquid after the ejection is then brought into contact with the atomizing air to produce an atomizing effect.
Manual paint spray gun principle
Manual spray guns can be divided into three types according to their spraying principle: pressure-type-P, gravity-G, suction-S-
Pressure-fed manual spray gun: The pressure-feed manual spray gun is mainly used to supply paint from an external paint pump or pressure tank/pressure tank. This paint pressure can be used to paint several spray guns simultaneously. supply. The spray gun is designed to align the paint nozzle with the air cap core so that a certain negative pressure does not form at the front end of the paint nozzle.
Gravity manual spray gun: Gravity hand spray gun is also used as a pot spray gun. It mainly uses gravity to pull the paint from the upper pot into the lower nozzle, and then uses the wind to spray it. For the full spray, the main advantage is that it can be repaired in small areas, which is very paint-saving.
Gravity spray guns are ideal for spray applications where the amount of paint used is low and color changes are required frequently. When the amount of paint is relatively large, a high-level paint can can be additionally added, and the hose is connected to the spray gun. In this case, the amount of paint sprayed can be adjusted by changing the height of the paint can.
Suction-type manual spray gun: The principle of suction-type spray gun is mainly to use the high-speed airflow to make the spray gun partially appear vacuum state. Because of the suction generated by it, the paint is sucked from the kettle into the nozzle, and atomized for spraying. The effect of spraying on a large area is that the paint has a good atomization effect and can meet the thickness and gloss requirements of the paint film.
The paint cans of the suction type spray gun are generally located at the lower part of the spray gun. The paint spray nozzle is generally in the center hole of the air cap and protrudes slightly forward. The compressed air is ejected from the center hole of the air cap, that is, around the paint nozzle. A negative pressure is formed at the front end of the paint nozzle to suck the paint from the paint can and atomize. The amount of paint sprayed on the suction spray gun is affected to a certain extent by the viscosity and density of the paint, and it is closely related to the caliber of the paint nozzle. The suction type spray gun is mainly suitable for general non-continuous spraying operations, and has a good effect.
Editor in charge: Zhao Hongli
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