Study on long borehole drilling equipment and drilling technique of soft outburst seam

In order to solve a borehole with a shallow depth, low drilling efficiency, drilling accidents frequently occurred and other problems long term affected to th e mine normal production during the gas control process of the soft and outburst seam, a design study was conducted on a high speed drilling rig from the major techni cal parameters of the drilling rig, load-sensing hydraulic system, high speed driving head, long stroke feeding mechanism and other major aspects.A long borehole drilli ng tools was designed from two aspects of a reversible rotary hexagonal rod and soft seam high speed cutting drilling bit.With the site test conducted in the typical unde rground mine, an analysis and discussion were conducted on the key technique and technology of the long borehole drilling in the soft outburst seam.Finally, a set of th e long borehole drilling equipment and drilling technology for the soft and outburst seam was researched and developed and a drilling depth target not less 300 m in the drilling of the soft and outburst seam was realized.