A painting robot, also known as a spray painting robot, is an industrial robot capable of automatically spraying paint or other coatings. It was invented in 1969 by the Norwegian company Trallfa (later merged into the ABB Group). A painting robot mainly consists of the robot body, a computer, and a corresponding control system. Hydraulically driven painting robots also include a hydraulic power source, such as an oil pump, oil tank, and motor.
Painting robots typically employ a 5- or 6-DOF articulated structure, providing ample arm movement and enabling complex trajectory movements. Their wrists generally have 2-3 DDOs, allowing for flexible motion. More advanced painting robots utilize flexible wrists, capable of bending and rotating in various directions, mimicking the movements of a human wrist. This allows them to easily penetrate small openings into workpieces to paint their inner surfaces. Painting robots are generally hydraulically driven, offering advantages such as high speed and explosion-proof performance. Teaching can be achieved through manual instruction or point-to-point numerical display. Painting robots are widely used in automotive, instrumentation, electrical appliance, and enamelware manufacturing processes.
The main advantages of spray painting robots are: (1) high flexibility and large working range; (2) improved spraying quality and material utilization rate; (3) easy to operate and maintain. They can be programmed offline, greatly shortening on-site debugging time; (4) high equipment utilization rate. The utilization rate of spray painting robots can reach 90%-95%.
Characteristics of different types of painting robots:
1. Air-assisted spraying robot
Air spraying robots, also known as low-pressure air spraying, use low-pressure air to atomize paint and apply it to surfaces (walls or wood). Compared to hand brushing, air spraying leaves no brush marks, produces a more uniform surface, and has a shorter working time, effectively shortening the construction period. However, air spraying can cause splattering and paint waste, and extremely fine particles can be seen upon close inspection. Air spraying typically uses air compressors commonly found in the construction industry, offering versatility and lower investment costs. Specialized machines such as suction-type and self-falling air spraying machines are also available on the market.
2. Airless spraying robot
Airless spraying robots can be used for applying high-viscosity paints with sharp edges, and are even suitable for some spraying projects with strict boundary requirements. Depending on the type of machine, they can be divided into pneumatic airless sprayers, electric airless sprayers, internal combustion airless sprayers, and automatic sprayers, among others. It is also important to note that if spraying metal surfaces, it is best to use metallic paint (enamel paint).
