The electrostatic spray gun uses the grounded object as the positive electrode, the paint atomization device as the negative electrode, and the paint atomization device is charged with a high negative voltage, and an electrostatic field is formed between the two electrodes, so that the atomized paint particles are negatively charged, so that the paint can be negatively charged. The method of being effectively attracted to the surface of the opposite electrode is called electrostatic coating. So why use the object to be coated as the positive electrode and the paint atomizing device as the negative electrode? On the contrary, it is difficult and unsafe to transfer to spark discharge.

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In order to implement electrostatic painting, the grounding of the coated object is an important and necessary condition, and the coated object must be a good electrical conductor. Wood is generally regarded as a poor electrical conductor, but when the moisture content of wood is 8% or more, electrostatic painting can be performed, and it has also been confirmed empirically. This is a normal electrostatic painting. The current value flowing between the positive and negative diodes is 20~50 microampere (MICRO-AMPERE), which is very small, so although it is like wood, it can also be applied to objects with a large resistance value. Electrostatic coating.

How to use an electrostatic spray gun

1. Cleaning

Tu on the air pressure of the oil pump so that the oil pump is filled with water for washing the gun, clean the oil pump and the nozzle, and open the retu switch of the oil pump by one third when cleaning the oil pump to make it circulate. (Water-based electrostatic gun oil retu pipe, direct oil retu for electrostatic grab), after cleaning, pick up the oil pump suction nozzle, tu on the oil pump retu switch (water gun electrostatic gun directly retus), drain the gun washing water, and then put it into the paint bucket, put it in When painting, stir the paint evenly. The paint concentration is generally about 11S for transparent paint and about 13S for colored paint. The paint concentration should not be too high, which will affect the conductivity and leveling.

2. Spray gun debugging

1. Install the nozzle, tu on the air pressure, and adjust the atomization arc of the nozzle. If you need to adjust the atomization arc during the spraying process, you must first place the spray gun head close to the wall, and discharge the residual static electricity on the gun. Adjust or tu off the power to release the residual The static electricity is adjusted again

2. Adjust and tu on the power switch of the electrostatic box, and adjust the static electricity range in normal use to (50-70V), and then observe the display position on the electrostatic box to see if it is within the reference range.

3. When spraying, determine the distance between the spray gun and the workpiece according to the plane size of the workpiece. The small hardware is generally (about 5-8 cm), and the distance of the large hardware can be appropriately extended (generally controlled at about 8-12 cm).

3. Start the paint supply device

Tu the power switch of the control box to the ON position, pull the trigger, when the red light is on, it shows that there is high voltage output at the front of the spray gun. Start the paint supply device, send the paint to the spray gun, adjust the air pressure regulating valve to low pressure (about 1-3kgf/cm²), rotate the pump, and inhale the paint. Use the paint pressure regulator installed at the paint inlet and outlet of the pump to adjust the pump pressure to about 0.5~2kgf/cm².

Fourth, spray paint

Adjust the atomizing air pressure to 0kgf/cm², do not spray air, pull the trigger until the spray gun sprays paint, if there is residual air in the paint hose, the paint will be intermittent when spraying, so spray until there is no air. until air. Paint spray volume adjustment The paint adjuster behind the spray gun, tu left to increase the spray volume, tu right until the head spray stops. Tighten the paint regulator to the left at rest to prevent spraying or reduce the pressure of paint delivery.

Disclaimer: The above methods are derived from the program system index or shared by netizens. They are only for your reference and use. They do not represent the research views of this website and are proved to be effective. Please pay attention to the authenticity and authority of the content source.