During the spraying process, appropriate thickness of anchor fasteners should be welded on the spraying surface. The particles of the coating spray should not exceed the diameter of the spray gun. The spray gun should be able to flow well in the material conveying pipe and should not fall off when the spraying body contracts. It is necessary to ensure continuous coating construction. 

During coating spraying, the material should be continuously fed into the spraying machine. Due to the pressure in the air storage tank, the water pressure in the storage tank during air supply must be stabilized at around 0.4 MPa to ensure that the compressed air enters the nozzle. The water pressure at the nozzle should be controlled at 0.14 - 0.21 MPa to ensure the thorough mixing of the coating spray. 
During the spraying process, the operation of the spray gun should be carried out by experienced technicians. Not only should the quality of the sprayed coating be guaranteed, but also the rebound rate of the spraying should be reduced. The distance between the nozzle and the spraying surface, as well as the amount of coating added, should also be controlled. When spraying the coating, the distance between the nozzle and the spraying surface should be kept within 0.8-1.2 meters. The nozzle should be kept perpendicular to the spraying surface to ensure that the spraying material can be directly sprayed onto the spraying surface. 
If the particles covering the aggregates are too large, they are likely to rebound in the middle of the conveying pipe. If the proportion of the adhesive is very small, it will easily cause the spray coating to be uneven and prone to peeling. Therefore, the distance between the spray gun nozzle and the sprayed surface must move in a circular pattern, and the diameter should be controlled between 300 and 400 mm. 
When applying the paint, the coating should be sprayed to the designed thickness in one go, and the spraying area should not be too large. Generally, it should be controlled within 1.0 - 1.5 square meters. After spraying, it should be extended to the surrounding areas for further spraying. 
During spraying and mixing, 2-4% of water should be added to prevent powder from flying. Add water at the nozzle of the spray gun. The water addition amounts for heavy spraying and light spraying are 10-14%. The ideal ratio is that when the pressure and distance from the nozzle are fixed, the water addition amount is appropriate to ensure that the sprayed coating does not flow. However, the added water volume should be stable. While ensuring the quality of the sprayed coating, it is still necessary to add as little water as possible to achieve good spraying performance. 
The painting sequence is from top to bottom and is carried out in sections. A 1-3 millimeter wide expansion joint is reserved every 1-2 meters. If the spraying is interrupted, the expansion joint should be sprayed in a stepped manner. If there are loose, dry cracks on the sprayed surface, they should be removed and re-sprayed. 
Spray robots usually adopt a structure of servo motors and harmonic reducers, featuring small size, wide working range, high speed, and high precision. They can be integrated with auxiliary equipment such as turntables, slide track conveyor systems, etc. The entire machine is fully sealed, dust-proof, and waterproof, and is suitable for the harsh environments of automotive spraying and dust removal industries. 
Compared with ordinary manual spraying, the spraying robot has four advantages: 
1. Good flexibility 
(1) Large activity radius and good flexibility; 
(2) It can achieve surface coating on both the inner and outer sides. 
(3) It can realize the mixed production of various vehicle types, such as car bodies, station wagons, pickup trucks, etc., through a mixed production line. 
2. Improve the quality of spraying and increase the utilization rate of materials 
(The) conformal spraying trajectory is precise, which improves the uniformity of the paint film and other aspects of the appearance of the spraying process. 
(2) Reduce over-dispersion and the amount of cleaning solvents, thereby increasing the utilization rate of materials. 
3. Easy to operate and maintain 
(1) Offline programming is supported, significantly reducing the on-site debugging time; 
(2) The plug-in structure and modular design enable rapid installation and replacement of components, significantly reducing maintenance time. 
(3) The maintenance of each component is highly accessible and convenient.