Space expansion device for soft coal seam gas extraction hole

• Main Authors: TAO MING, ZHAO RUI, XIANG GONGLIANG, JIA YUCHUN, QIU XIANPENG, XIAO ZIHENG, ZHAO HENG, WU XINGYU, CAO ZHENG, ZHAO QIZHENG
• Format: Patent
• Language: Chinese; English
• Published: 19.01.2024
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; MINING; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS

The invention discloses a soft coal seam gas extraction hole space expansion device which comprises an extraction pipe and a supporting frame, the extraction pipe is provided with a plurality of gas extraction holes, the supporting frame comprises a fixing rod, a plurality of sliding ferrules and a plurality of sets of rotatable supporting rods, and the sliding ferrules are all in sliding connection with the fixing rod; a set of supporting rods are arranged between every two adjacent sliding ferrules, each supporting rod comprises a first connecting rod and a second connecting rod, and the first connecting rods and the second connecting rods are equal in length and rotationally connected. One of every two adjacent sliding ferrules is rotationally connected with the first connecting rod, the other sliding ferrule is rotationally connected with the second connecting rod, the sliding ferrule close to one end of the extraction pipe is fixedly connected with a sleeve, the extraction pipe is arranged outside the sl