Equipped with a universal industrial robot and fitted with a sand recycling system, the unit performs internal blasting for castings with complex inner cavities such as cylinder blocks and cylinder heads. Featuring specially designed spray guns and nozzles combined with a 3D vision system, the robot inserts spray guns into casting inner cavities for sand‑blasting operations. The spray gun adopts an adjustable dual‑gun configuration to meet blasting requirements for different hole spacings.