The key spraying equipment in powder spraying equipment is electrostatic powder spraying gun. On the workpiece to be coated with a positive electrode, it directly determines the quality of the workpiece coating, and is a key factor that determines the level of the process.
Electrostatic powder spray gun usually consists of high voltage generator, gun body, powder conveying system and control system. The picture on the right is a new type of electrostatic powder spray gun using dense phase technology and equipped with a complete control system. Due to the electrostatic spraying operation, the electrostatic powder gun is mainly responsible for the main powder spraying processes such as electric field generation, powder conveying, and powder spraying. Among them, the traditional powder conveying adopts the Venturi physics principle. The Venturi principle is that the powder enters the powder tube and is transported to the spray gun driven by the high-speed airflow. Therefore, in addition to the electrostatic performance, aerodynamics also plays an important role in the electrostatic powder spray gun. status.
In the technology of electrostatic powder spray gun, in addition to the use of Venturi delivery, HDLV technology can also be used. The so-called HDLV is the meaning of High-Density Powder, Low-Velocity Air, which can be translated into high-density powder and low-flow air. The conveying in the sense is powder dense phase conveying. After reducing the powder flow rate, the powder is more likely to form a soft mist, which effectively overcomes the phenomenon of Faraday cage and adsorbs to the required spraying workpiece.
Due to the reduction of the powder flow rate, the powder pipe, liner and other components in the electrostatic powder spray gun that are in direct contact with the powder will greatly reduce the loss rate. The diameter of the pipe becomes only half of the traditional pipe (12.7mm diameter), and the efficiency is doubled. The technology of electrostatic powder spraying gun has been continuously improved, and some advanced principles are constantly used in the equipment, so that the technology of powder spraying gun has been continuously improved and the effect of powder spraying of workpieces has been continuously improved.
