The characteristics of the friction electrostatic powder spraying gun: 1, the powder charging of the friction gun and the electric field powder coating are charged in the friction gun, and the charge is not from the corona discharge of the electrode tip, but due to the collision, friction, contact and separation of the powder and the gun wall. That is, the powder is charged by the principle of friction electrification. After the mixture of powder particles and air passes through the friction gun, it is ejected at the muzzle by air pressure. Charged powder particles form a space electric field, and its electric field strength is determined by the space charge density and the geometry of the electric field, that is, by the charge of the powder particles, the proportion of the powder in the airpowder mixture, and the spray pattern of the spray gun. Due to the decrease of air pressure and the repulsive force of the same charge, the volume of the air powder mixture gradually increases, the charge density decreases and the electric field weakens. The electric field of the friction gun is strongest at the muzzle, and the electric field gradually weakens from the muzzle to the workpiece. The direction of electric field weakening is consistent with the direction of air flow, and the direction of powder force is the same with the direction of air flow.
2, the characteristics of the friction electrostatic powder gun The friction gun has a charging method and electric field different from the high-voltage gun, so the friction gun has its own characteristics. These characteristics show superiority in electrostatic spraying. (1) The powder charging of the friction gun is caused by the friction between the powder and the gun wall, which determines that the friction gun does not need a high-voltage power supply - electrostatic generator in electrostatic spraying. Thus, the equipment investment can be saved by 10-30%, especially for small test equipment, and the saving proportion is higher. Although the electrostatic generator energy consumption is not large, but for a long time, the electrostatic generator energy consumption is also considerable. (2) The use of friction guns for spraying is safer, because there is no high-voltage electrostatic generator in the spraying equipment. A reasonably designed high-voltage electrostatic generator will not cause personal injury or death, but the stimulation of high-voltage electric shock will always make people nervous. In addition, there is no metal electrode in the friction gun, and there will be no spark discharge caused by electrode short circuit in the spray and lead to the gas powder mixture. This is even more important when spraying the inner wall of the pipe or the inner cavity of the container. (3) It is very convenient to spray with the friction gun. First, the friction gun is not connected to the high-voltage cable, and it is convenient to handle; Second, the spraying distance is less affected, the friction gun is closer to the workpiece, and the spraying effect is similar. (4) Spraying small workpieces or workpieces with complex surface shapes with friction guns is much superior to high-pressure guns. (5) There is no metal electrode in the friction gun, so there will be no electrode powder phenomenon, and it will avoid the loss of powder on the electrode to ensure that the surface of the powder layer is smooth and smooth. (6) The friction gun can be sprayed with a thicker coating wire, which is not compared with the general high-pressure gun.
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