下垄钨矿下垄坑口平巷掘进采用混合式通风,压入风筒的排风口一般距工作面只有5～7米。为了在爆破时不拆风筒,我们试验了用铁板保护风筒的简便装置,并在生产实践中收到了效果。以前,爆破后排烟要30分钟左右,巷道尚有炮烟味,现在排烟15～20分钟,就无炮烟味。 Under the ridge next to the ridge mine Ridge tunnel drifting using mixed ventilation, forced into the air duct exhaust generally only 5 to 7 meters away from the face. In order not to disassemble the blower during blasting, we tested a simple device to protect the blower with iron plates and received the results in production practice. In the past, the blasting after the smoke to 30 minutes, the tunnel still gun smoke flavor, and now smoke 15 to 20 minutes, there is no gun smoke.