The difference between internal and external electrostatic s

　　The difference between internal and external electrostatic spraying equipment

　　1. Due to the inherent difference between the high-voltage external electrostatic spraying machine and the built-in electrostatic spraying machine, there is currently no external spraying machine with the same performance as the built-in electrostatic spraying machine in the world.

　　2, as long as the power of the external spray gun is large enough and the voltage is high enough, the effect of the built-in spray gun can be obtained-"This statement is wrong and misleading.

　　The difference between internal and external electrostatic spraying equipment

　　The characteristics of the high-voltage external electrostatic spray molding machine The characteristics of the high-voltage built-in electrostatic spray molding machine

　　1. The difference between circuit structure and circuit structure is the source of their names. The high-voltage static electricity generation and control circuit of the high-voltage outer mold (such as YL-405) is concentrated in the main box outside the spray gun, and the spray gun is almost empty. High-voltage built-in models, such as YL-505 i. 505II. 505III. 505 IV) High-voltage electrostatic power generation and high-voltage spray gun control circuit, the gun is sealed with an expensive circuit module.

　　2. There is a high-voltage cable on the spray gun of an electrostatic spraying machine (such as YL405), and its shape is different from the high-voltage outer surface. It is responsible for transferring high-voltage static electricity from the main box to the spray gun. In addition to the high-voltage cable, there is also a low-voltage control line on the spray gun. High-voltage built-in electrostatic spray molding machine (such as YL-505 i.) No. 505II. 505iii) There are no high-voltage wires on the spray gun, only low-voltage multi-core cables are connected to the host, including drive and control wires.

　　The difference between internal and external electrostatic spraying equipment

　　3. Poor performance The spray gun of the high-pressure external spray molding machine is basically empty, relatively light in weight, and easy to operate. The surface of the workpiece with simple surface and shape can be sprayed smoothly. However, work pieces with complex shapes, cavities, Fjords, intersections or corners are encountered, and iron (not powder) can be easily exposed at the corners and cavities, gaps, etc. For various internal angles (even angles less than 90°), the holes and cracks of the workpiece can be used well, and the iron is not easy to be exposed, especially in the vicinity of the dead angle, the powder cannot be solved with a non-built-in spray gun. When spraying ordinary flat workpieces, the main powder rate (powder utilization rate) and spraying speed are also significantly better than external spray guns.

　　The difference between internal and external electrostatic spraying equipment

　　4. The principle of performance difference

　　1. The high-voltage static electricity of the high-voltage external high-pressure spray gun is generated by the host. The high-voltage static electricity is transmitted to the working discharge needle of the spray gun through the high-voltage cable, and the high-voltage static electricity transmission process will inevitably cause high-voltage leakage and loss, so the high-voltage static electricity transmission to the spray gun head will be greatly reduced.

　　2. Due to static electricity leakage, the discharge body of the external spray gun becomes the sum of the main engine, high voltage cable and spray gun, and the discharge body is very large. If an electric field is encountered in a workpiece with electrostatic shielding characteristics (such as a small-sized metal cavity), an obvious electrostatic shielding effect will be produced, and the strength of the working electric field will be greatly reduced or even close to "0".

　　The difference between internal and external electrostatic spraying equipment

　　High voltage leakage and loss, electrostatic shielding effect directly lead to the powdering of the external spray gun during spraying, the shape is complex, not ideal or even powdery

　　1. The spray gun head generates high-voltage built-in spray gun high-voltage static electricity, which directly acts on the working electric field, without leakage and transmission process loss.

　　2. The electrostatic discharge body of the high-voltage built-in spray gun is concentrated on the discharge needle, which is almost equal to a point-shaped discharge body. The main body of the discharge body (the ejection needle) moves with the movement of the spray gun. When the metal cavity with electrostatic shielding is easily produced by spraying, the discharge body can extend into the cavity, thereby achieving the effect of electrostatic shielding. The results show that during the electrostatic spraying process, the electric field intensity outside the cavity is close to 0, while the electric field intensity inside the cavity is not affected by the electrostatic shielding effect, and has almost no effect on the powder filling rate.

　　3. Because the high-voltage static electricity of the high-voltage built-in spray gun does not have high voltage leakage and loss, and can overcome the electrostatic shielding effect, it can show a good stable powder rate when the spray shape is complicated.