AT500型电动天井钻机与该机配套的扩孔刀头,是由长沙矿山研究院和广东南山钨矿合作研制成功的。这两项研究成果,最近在广东南山钨矿同时通过鉴定。从1982年11月起,到1983年6月25日,使用AT500型电动天井钻机,在抗压强度为1000～1800公斤/厘米~2的岩石中,已钻成5条天井,总进尺231米,其中φ500毫米的天井139米,φ800毫米的天井92米。该机曾用21天(实际工作19个班)连续钻成2条φ500毫米的天井共92.8米。平均综合成井在φ500 AT500-type electric patio rig and the machine supporting the reaming cutter head, by the Changsha Institute of Mining and Guangdong Nanshan tungsten mine successfully developed. The two research results recently passed the appraisal at Guangdong Nanshan Tungsten Mine. From November 1982 to June 25, 1983, using the AT500 Electric Bed Rower, five wells have been drilled in rocks with a compressive strength of 1,000 to 1,800 kg / cm ~ 2, with a total footage of 231 meters , Of which φ500 mm patio 139 meters, φ800 mm patio 92 meters. The machine has been used 21 days (the actual work of 19 classes) continuous drilling into two φ500 mm total of 92.8 m patio. The average synthetic well at φ500