Exhaust system: All pipelines of the exhaust system can not be blocked, all chromium fog can be recovered, and can automatically return to the mother tank. The emission index of chromium fog generated after treatment should meet the provisions of GB16297-1996 "Emission Standards for air pollutants" and "emission standards for electroplating pollutants", chromium acid fog emission ≤0.05mg/m³, exhaust gas treatment device adopts domestic leading brands