Here is a case introduction of a steel plate shot blasting and painting line:
In the pretreatment operation site of Daming Jingjiang Processing Center, the unit is pretreating 9Ni steel plates for a tank pre - fabrication project. The steel plates sucked by the large crane are lifted slowly, then moved parallel to the entrance and put down, and then processed, inspected, and other operations are carried out in sequence through the relevant processes of the pretreatment line, and finally lifted to the temporary storage position.
Shot Blasting: The steel plate is sent into the enclosed shot blasting chamber by the roller through the shot blasting system1. The high - speed rotating impeller throws steel shots and cut wire shots onto the steel plate surface, impacting the steel plate surface to remove rust1. The abrasive enters the screw conveyor and then is sent to the separator through the bucket elevator1. The reusable abrasive is stored in the storage bin, and the dust is sent to the dust collector through the duct1. Then, the dust and remaining shots on the surface of the steel plate are cleaned by the brush, abrasive reclaim screw conveyor, and high - pressure abrasive blowing system1.
Primer Spraying: After the steel plate is shot - blasted and cleaned, it is conveyed into the painting room through the roller conveyor system1. The primer is sprayed onto the surface of the steel plate by a high - pressure airless spray gun installed on the top and bottom of the spray car1. The automatic spray room is composed of a frequency converter, motor, drive chain, traction chain, paint car, chamber, towline, and high - pressure airless spraying machine1.
Drying: After spraying the primer, the steel plate is transported into the drying chamber by the V - type structure conveyor for drying1. The electric heater is arranged at the top of the outside drying room1. Through the heat exchanger, the heated air is sent into the drying room directly by the blower through the duct system1. This enables the primer on the steel plate surface to reach a touch - dry state1.
The whole machine is automatically controlled by PLC, with a color touch - screen human - machine interface, which has a high degree of automation and is easy to operate and maintain.
The whole - line conveying adopts frequency - conversion speed - regulation control. The workpieces can be conveyed at a constant speed with high precision under variable - load conditions.
The painting reciprocating mechanism adopts a special reciprocating sliding - table module, which is driven by an imported servo motor, with high precision and low noise. The American Graco airless spraying system is adopted, which sprays evenly and reliably and requires less maintenance.
Pulse - jet cartridge filtration is used for dust removal, which is environmentally friendly and economical, with high dust - removal efficiency.
Thanks to the one - - time shot blasting and painting assembly - line operation of the steel plate pretreatment line in Daming Jingjiang Processing Center, the production efficiency has been greatly improved. In 2022, the total processing fee increased by 28.8% compared with the previous year, and the total processing volume increased by 33.8%. Moreover, the high - quality coating obtained through this process has improved the anti - fatigue performance and corrosion - resistance ability of mechanical products, prolonging their service life, and also ensuring the cleanliness of the working environment in the subsequent processes.
