Abstract: 　When the mine skip shaft is used as a return air shaft,the return air carrying moisture and pollutants is easy to corrode the wellhead steel structure and reduce the visibility of the operation,which seriously threatens the safety production. Aiming at the core problems of return air overflow,equipment corrosion and environmental deterioration in skip shaft,a new scheme of full section isolation and intelligent control of pressure difference of jet gas curtain is proposed.The return air inter ception and partition device for skip well in metal mine was developed,and the field industrial test was completed.Based on the principle of air curtain jet dynamics,the device uses a flat cross jet to form a full-section air curtain barrier.Combined with re al-time pressure monitoring and PLC remote frequency conversion control,it realizes accurate control of air flow interception and dynamic matching of wind pressure.It has the characteristics of simple structure,flexible regulation and strong adaptabili ty.The actual measurement shows that the device can significantly improve the wellhead operation environment,the air flow iso lation rate exceeds 90%,effectively eliminate the corrosion hidden danger of the return air to the lifting equipment,and improve the operation safety.The research results provide reliable technical solutions for mine safety production and ventilation system optimization,fill the technical gaps in related fields,and have important engineering application value and promotion prospects.

Key words: mine ventilation,skip shaft return air,airflow interception,airflow isolation,jet air volume