The composition and structure of powder electrostatic spraying equipment
Powder electrostatic spraying equipment mainly includes: powder spraying chamber, high-voltage electrostatic generator, electrostatic spraying gun, powder feeder, powder recovery device, Workpiece rotation mechanism, etc. 1. Classification: Spray guns can be divided into portable powder spray guns, fixed automatic powder spray guns, disc spray guns, etc. according to their uses; according to the charging form, they can be divided into internal charged electric guns and external charged electric guns; according to the form of their diffusion mechanism, they can be divided into They are conflict-type guns, rebound-type guns, secondary air-intake guns, centrifugal cup-type guns, etc.
2. Spraying efficiency: The charging mechanism of the powder spray gun is a key factor in improving spraying efficiency. Generally speaking, the core of powder spraying equipment is the spray gun and charging system. As far as the market is concerned, corona spray guns account for a huge proportion. This is because the biggest benefit of using high-voltage corona discharge to charge powder is that it can spray all types of thermosetting powder coatings today, and Can get very good results. Its advantages are mainly reflected in excellent stability, powder loading rate and powder loading speed.
3. The development process of the spray gun is as follows: voltage control o current control o total energy control. Total energy control means that as the spray gun moves away from the workpiece, its voltage and current are constantly adjusted to the ideal state to achieve the best coating effect. 1) The powder supply system continuously and evenly transports the coated powder material from the powder container to the powder spray gun for spraying.
The powder supply system consists of an air compressor, an oil-water separator, an air dryer, a regulating valve, a compressed air pipeline, an electromagnetic control valve, a powder feeder, and a powder conveying pipeline.
2) Type of powder feeder
In the powder electrostatic spraying powder supply system, there are many types of powder feeders used, which can usually be divided into: pressure vessel type, screw or Mechanical conveying type of turntable and Venturi air suction type.
3) Powder recovery device
Powder recovery can be divided into wet method and dry method.
The wet method is to filter the airflow containing powder through a liquid container to achieve purification. The powder containing liquid is dried and then reused.
Dry powder recovery is to collect powder particles in the powder airflow discharged from the powder spraying chamber. The types of dry powder recovery include gravity sedimentation, inertial separation, cyclone separation, sintered plate separation, etc. In actual production, multi-stage recovery devices are often used to achieve better separation effects.
This is a brief introduction to the powder spraying process and equipment. Here is an introduction to the paint process and equipment.