Four-Tank Hydrocarbon Washer adopts four independent working tanks for rough washing, vacuum ultrasonic fine cleaning, vapor rinsing and vacuum drying, equipped with automatic robotic transfer and integrated distillation recovery system. The fully enclosed vacuum explosion-proof structure thoroughly removes oil stains and aluminum chips inside blind holes and cross holes of automotive die-casting parts and hydraulic valve bodies. The solvent recycling rate exceeds 98%, delivering consistent residue-free cleanliness for mass production. Unmanned full-process operation greatly cuts labor and solvent consumption costs.