Backflow prevention device for coal mine grouting drilling

• Main Authors: WANG SHEN, YU HONGBIN, YUAN RUIFU, YU CHUNSHENG, LI HUAMIN, ZHENG LIJUN, YANG YONGLI, MU LIBIN, LI DONGYIN, QIN WEICHAO, GAO JIAXING, LI YANFEI, KUANG YUNFENG, WU TAO, MENG WUFENG, DONG SHE
• Format: Patent
• Language: Chinese; English
• Published: 04.01.2022
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS; SHAFTS; TUNNELS

The utility model provides an anti-backflow device for coal mine grouting drilling, which comprises a grouting head internally provided with a steel ball, one end of the grouting head is fixedly connected with an inserting part, one surface of the grouting head far away from the inserting part is provided with a stepped hole, a straight thread cylinder is inserted in the stepped hole, and the straight thread cylinder is provided with a threaded hole. Two inserting strips are symmetrically and fixedly connected to the outer surface of the straight threaded cylinder, two inserting grooves matched with the inserting strips are symmetrically formed in the inner surface of the stepped hole, and the inserting strips are inserted into the inserting grooves and fixed into the inserting grooves through connecting bolts. The utility model has the beneficial effects that the combined assembly of the thread part is realized, and the waste of resources is reduced. 本实用新型提供一种用于煤矿注浆钻孔的防回流装置，包括内部设有钢球的注浆头，所述注浆头一端固定连接有插接部，所述注浆头