| 摘要 |
The drive head assembly (26) for a drilling machine includes a drive head body (42) having a cavity with an upper portion (46) and a lower portion (44). A bolt (70) is located in the upper portion (46) of the drive head body cavity, and a collet (56) is located in the lower portion (44) of the drive head body cavity. The collet (56) also includes a cavity, and the collet insert (98) has a drill string opening to fixedly secure a drill string (DS).
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